text: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements. See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership. The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License. You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied. See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  #include <string>
  #include <fstream>
  #include <iostream>
  #include <vector>
  #include <assert.h>
  
  #include <stdlib.h>
  #include <sys/stat.h>
  #include <sstream>
  #include <thrift/compiler/generate/t_oop_generator.h>
  #include <thrift/compiler/platform.h>
  
  using std::map;
  using std::ofstream;
  using std::ostringstream;
  using std::string;
  using std::stringstream;
  using std::vector;
  
  using namespace std;
  
  // static const string endl = "\n";  // avoid ostream << std::endl flushes
  static const string kFieldPrefix = "__thrift_";
  static const string kStructInheritanceRootObjectName = "TBaseStruct";
  static const string kSetPostfix = "_set";
  static const string kToStringPostfix = "ToString";
  
  /**
   * Objective-C code generator.
   *
   * mostly copy/pasting/tweaking from mcslee's work.
   */
  class t_cocoa_generator : public t_oop_generator {
   public:
    t_cocoa_generator(
        t_program* program,
        const std::map<std::string, std::string>& parsed_options,
        const std::string& option_string)
      : t_oop_generator(program)
    {
      (void) option_string;
      std::map<std::string, std::string>::const_iterator iter;
  
      iter = parsed_options.find("log_unexpected");
      log_unexpected_ = (iter != parsed_options.end());
  
      iter = parsed_options.find("validate_required");
      validate_required_ = (iter != parsed_options.end());
  
      iter = parsed_options.find("nullability");
      nullability_ = (iter != parsed_options.end());
  
      iter = parsed_options.find("simple_value_equality");
      simple_value_equality_ = (iter != parsed_options.end());
  
      iter = parsed_options.find("import_path");
      if (iter == parsed_options.end()) {
        import_path_ = "";
      } else {
        import_path_ = iter->second;
        if (import_path_.at(import_path_.length() - 1) != '/') {
          import_path_ += '/';
        }
      }
  
      out_dir_base_ = "gen-cocoa";
    }
  
    /**
     * Init and close methods
     */
  
    void init_generator() override;
    void close_generator() override;
  
    void generate_consts(std::vector<t_const*> consts) override;
  
    /**
     * Program-level generation functions
     */
  
    void generate_typedef(t_typedef* ttypedef) override;
    void generate_enum(t_enum* tenum) override;
    void generate_struct(t_struct* tstruct) override;
    void generate_xception(t_struct* txception) override;
    void generate_service(t_service* tservice) override;
  
    void print_const_value(
        std::ofstream& out,
        std::string name,
        t_type* type,
        const t_const_value* value,
        bool defval=false,
        bool is_property=false);
    std::string render_const_value(ofstream& out, t_type* type,
                                   const t_const_value* value,
                                   bool containerize_it=false);
  
    void generate_cocoa_struct(t_struct* tstruct, bool is_exception);
    void generate_cocoa_struct_interface(std::ofstream& out, t_struct* tstruct, bool is_xception=false);
    void generate_cocoa_struct_implementation(std::ofstream& out, t_struct* tstruct, bool is_xception=false, bool is_result=false);
    void generate_cocoa_struct_initializer_signature(std::ofstream& out,
                                                     t_struct* tstruct);
    void generate_cocoa_struct_init_with_coder_method(ofstream &out,
                                                      t_struct* tstruct,
                                                      bool is_exception);
    void generate_cocoa_struct_encode_with_coder_method(ofstream &out,
                                                      t_struct* tstruct,
                                                      bool is_exception);
    void generate_cocoa_struct_hash_method(ofstream& out);
    void generate_cocoa_struct_is_equal_method(ofstream& out,
                                               t_struct* tstruct,
                                               bool is_exception);
    void generate_cocoa_struct_field_accessor_declarations(std::ofstream& out,
                                                           t_struct* tstruct,
                                                           bool is_declare_getter,
                                                           bool is_declare_setter,
                                                           bool is_declare_isset_getter,
                                                           bool is_exception);
    void generate_cocoa_struct_field_accessor_implementations(std::ofstream& out,
                                                              t_struct* tstruct,
                                                              bool is_exception);
    void generate_cocoa_struct_reader(std::ofstream& out, t_struct* tstruct);
    void generate_cocoa_struct_result_writer(std::ofstream& out, t_struct* tstruct);
    void generate_cocoa_struct_writer(std::ofstream& out, t_struct* tstruct);
    void generate_cocoa_struct_validator(std::ofstream& out, t_struct* tstruct);
    void generate_cocoa_struct_description(std::ofstream& out, t_struct* tstruct);
    void generate_cocoa_struct_toDict(std::ofstream& out, t_struct* tstruct);
    void generate_cocoa_struct_makeImmutable(std::ofstream& out, t_struct* tstruct);
    void generate_cocoa_struct_mutableCopyWithZone(std::ofstream& out, t_struct* tstruct);
  
    std::string function_result_helper_struct_type(t_function* tfunction);
    std::string function_args_helper_struct_type(t_function* tfunction);
    void generate_function_helpers(t_function* tfunction);
  
    /**
     * Service-level generation functions
     */
  
    void generate_cocoa_service_protocol (std::ofstream& out, t_service* tservice);
    void generate_cocoa_service_client_interface (std::ofstream& out, t_service* tservice);
    void generate_cocoa_service_client_implementation (std::ofstream& out, t_service* tservice);
    void generate_cocoa_service_server_interface (std::ofstream& out, t_service* tservice);
    void generate_cocoa_service_server_implementation (std::ofstream& out, t_service* tservice);
    void generate_cocoa_service_helpers   (t_service* tservice);
    void generate_service_client    (t_service* tservice);
    void generate_service_server    (t_service* tservice);
    void generate_process_function  (t_service* tservice, t_function* tfunction);
  
    /**
     * Serialization constructs
     */
  
    void generate_deserialize_field        (std::ofstream& out,
                                            t_field*    tfield,
                                            std::string fieldName);
  
    void generate_deserialize_struct       (std::ofstream& out,
                                            t_struct*   tstruct,
                                            std::string prefix="");
  
    void generate_deserialize_container    (std::ofstream& out,
                                            t_type*     ttype,
                                            std::string prefix="");
  
    void generate_deserialize_set_element  (std::ofstream& out,
                                            t_set*      tset,
                                            std::string prefix="");
  
    void generate_deserialize_map_element  (std::ofstream& out,
                                            t_map*      tmap,
                                            std::string prefix="");
  
    void generate_deserialize_list_element (std::ofstream& out,
                                            t_list*     tlist,
                                            std::string prefix="");
  
    void generate_serialize_field          (std::ofstream& out,
                                            t_field*    tfield,
                                            std::string prefix="");
  
    void generate_serialize_struct         (std::ofstream& out,
                                            t_struct*   tstruct,
                                            std::string fieldName="");
  
    void generate_serialize_container      (std::ofstream& out,
                                            t_type*     ttype,
                                            std::string prefix="");
  
    void generate_serialize_map_element    (std::ofstream& out,
                                            t_map*      tmap,
                                            std::string iter,
                                            std::string map);
  
    void generate_serialize_set_element    (std::ofstream& out,
                                            t_set*      tmap,
                                            std::string iter);
  
    void generate_serialize_list_element   (std::ofstream& out,
                                            t_list*     tlist,
                                            std::string index,
                                            std::string listName);
  
    /**
     * Helper rendering functions
     */
  
    std::string cocoa_prefix();
    std::string cocoa_imports();
    std::string cocoa_thrift_imports();
    std::string custom_thrift_marker();
    std::string type_name(t_type* ttype, bool class_ref=false);
    std::string base_type_name(t_base_type* tbase);
    std::string declare_field(t_field* tfield);
    std::string declare_property(t_field* tfield);
    std::string function_signature(t_function* tfunction);
    std::string argument_list(t_struct* tstruct);
    std::string type_to_enum(t_type* ttype);
    std::string format_string_for_type(t_type* type);
    std::string call_field_setter(t_field* tfield, std::string fieldName);
    std::string containerize(t_type * ttype, std::string fieldName);
    std::string decontainerize(t_field * tfield, std::string fieldName);
  
    bool type_can_be_null(t_type* ttype) {
      ttype = get_true_type(ttype);
  
      return
        ttype->is_container() ||
        ttype->is_struct() ||
        ttype->is_xception() ||
        ttype->is_string();
    }
  
   private:
  
    std::string cocoa_prefix_;
    std::string constants_declarations_;
  
    /**
     * File streams
     */
  
    std::ofstream f_header_;
    std::ofstream f_impl_;
  
    bool log_unexpected_;
    bool validate_required_;
    bool nullability_;
    bool simple_value_equality_;
    string import_path_;
  };
  
  
  /**
   * Prepares for file generation by opening up the necessary file output
   * streams.
   */
  void t_cocoa_generator::init_generator() {
    // Make output directory
    make_dir(get_out_dir().c_str());
    cocoa_prefix_ = program_->get_namespace("cocoa");
  
    // we have a .h header file...
    string f_header_name = program_name_+".h";
    string f_header_fullname = get_out_dir()+f_header_name;
    f_header_.open(f_header_fullname.c_str());
  
    f_header_ <<
      autogen_comment() <<
      endl;
  
    f_header_ <<
      custom_thrift_marker() <<
      cocoa_imports() <<
      cocoa_thrift_imports();
    if (nullability_) {
      f_header_ << "NS_ASSUME_NONNULL_BEGIN\n\n";
    }
  
    // ...and a .m implementation file
    string f_impl_name = get_out_dir()+program_name_+".m";
    f_impl_.open(f_impl_name.c_str());
  
    f_impl_ <<
      autogen_comment() <<
      endl;
  
    f_impl_ <<
      custom_thrift_marker() <<
      cocoa_imports() <<
      cocoa_thrift_imports() <<
      "#import \"" << f_header_name << "\"" << endl <<
      endl;
  
  }
  
  /**
   * Prints standard Cocoa imports
   *
   * @return List of imports for Cocoa libraries
   */
  string t_cocoa_generator::cocoa_imports() {
    return
      string() +
      "#import <Foundation/Foundation.h>\n" +
      "\n";
  }
  
  /**
   * Add a marker for this generator
   *
   */
  std::string t_cocoa_generator::custom_thrift_marker()
  {
    return std::string("/**\n")
           + std::string("* @generated by https://github.com/korovkin/thrift\n")
           + "*/\n\n";
  }
  
  /**
   * Prints thrift runtime imports
   *
   * @return List of imports necessary for thrift runtime
   */
  string t_cocoa_generator::cocoa_thrift_imports() {
    string systemImports[] = { "TProtocol", "TApplicationException",
      "TProtocolException", "TProtocolUtil", "TProcessor", "TObjective-C",
      "TBase", kStructInheritanceRootObjectName,
    };
  
    string result = "";
    for (const auto& systemImport : systemImports) {
      if (import_path_ == "") {
        result += "#import \"" + systemImport + ".h\"\n";
      } else {
        result += "#import <" + import_path_  + systemImport + ".h>\n";
      }
    }
  
    // Include other Thrift includes
    const vector<t_program*>& includes = program_->get_includes();
    for (size_t i = 0; i < includes.size(); ++i) {
      result += "#import \"" + includes[i]->get_name() + ".h\"" + "\n";
    }
    result += "\n";
  
    return result;
  }
  
  
  /**
   * Finish up generation.
   */
  void t_cocoa_generator::close_generator()
  {
    // stick our constants declarations at the end of the header file
    // since they refer to things we are defining.
    f_header_ << constants_declarations_ << endl;
    if (nullability_) {
      f_header_ << endl << "NS_ASSUME_NONNULL_END\n" << endl;
    }
  }
  
  /**
   * Generates a typedef. This is just a simple 1-liner in objective-c
   *
   * @param ttypedef The type definition
   */
  void t_cocoa_generator::generate_typedef(t_typedef* ttypedef) {
    f_header_ <<
      indent() << "typedef " << type_name(ttypedef->get_type()) << " " << cocoa_prefix_ << ttypedef->get_symbolic() << ";" << endl <<
      endl;
  }
  
  /**
   * Generates code for an enumerated type. In Objective-C, this is
   * essentially the same as the thrift definition itself, using the
   * enum keyword in Objective-C.  For namespace purposes, the name of
   * the enum plus an underscore is prefixed onto each element.
   *
   * @param tenum The enumeration
   */
  void t_cocoa_generator::generate_enum(t_enum* tenum) {
    f_header_ <<
      indent() << "typedef NS_ENUM(int, " << cocoa_prefix_ << tenum->get_name() << ") {" << endl;
    indent_up();
  
  
    vector<t_enum_value*> constants = tenum->get_constants();
    vector<t_enum_value*>::iterator c_iter;
    bool first = true;
    for (c_iter = constants.begin(); c_iter != constants.end(); ++c_iter) {
      if (first) {
        first = false;
      } else {
        f_header_ <<
          "," << endl;
      }
      f_header_ <<
        indent() << cocoa_prefix_ << tenum->get_name() << "_" << (*c_iter)->get_name();
      f_header_ <<
        " = " << (*c_iter)->get_value();
    }
  
    indent_down();
    f_header_ <<
      endl <<
      "};" << endl <<
      endl;
  
  
    const string toStringFunctionDeclaration =
          string("NSString* ")
          + cocoa_prefix_ + tenum->get_name() + kToStringPostfix + "(const "
          + cocoa_prefix_ + tenum->get_name() + " value)";
  
    f_header_ << indent() <<  toStringFunctionDeclaration << ";" << endl << endl;
  
    // implementation:
    f_impl_ << indent() <<  toStringFunctionDeclaration << endl << "{" << endl;
    indent_up();
  
    f_impl_ << indent() << "switch(value) {" << endl;
    indent_up();
    for (c_iter = constants.begin(); c_iter != constants.end(); ++c_iter) {
      string itemName = cocoa_prefix_ + tenum->get_name() + "_" + (*c_iter)->get_name();
      f_impl_ << indent()
              << "case " << itemName << ": return @\"" + itemName + "\";" << endl;
    }
    indent_down();
    f_impl_ << indent() << "}" << endl;
    f_impl_ << indent()
            << "return [NSString stringWithFormat:@\""
            << cocoa_prefix_ << tenum->get_name() << "_"
            << "%d\", (int)value];"
            << endl;
    indent_down();
    f_impl_ << indent() << "}" << endl;
    f_impl_ << endl;
  }
  
  /**
   * Generates a class that holds all the constants.  Primitive values
   * could have been placed outside this class, but I just put
   * everything in for consistency.
   */
  void t_cocoa_generator::generate_consts(std::vector<t_const*> consts) {
    std::ostringstream const_interface;
    string constants_class_name = cocoa_prefix_ + program_name_ + "Constants";
  
    const_interface << "@interface " << constants_class_name << " : " << kStructInheritanceRootObjectName << " ";
    scope_up(const_interface);
    scope_down(const_interface);
  
    // getter method for each constant defined.
    vector<t_const*>::iterator c_iter;
    for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
      string name = (*c_iter)->get_name();
      t_type* type = (*c_iter)->get_type();
      const_interface <<
        "+ (" << type_name(type) << ") " << name << ";" << endl;
    }
  
    const_interface << "@end";
  
    // this gets spit into the header file in ::close_generator
    constants_declarations_ = const_interface.str();
  
    // static variables in the .m hold all constant values
    for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
      string name = (*c_iter)->get_name();
      t_type* type = (*c_iter)->get_type();
      f_impl_ <<
        "static " << type_name(type) << " " << cocoa_prefix_ << name;
      if (!type->is_container() && !type->is_struct()) {
        f_impl_ << " = " << render_const_value(f_impl_, type, (*c_iter)->get_value());
      }
      f_impl_ << ";" << endl;
    }
    f_impl_ << endl;
  
    f_impl_ << "@implementation " << constants_class_name << endl;
  
    // initialize complex constants when the class is loaded
    f_impl_ << "+ (void) initialize ";
    scope_up(f_impl_);
  
    for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
      if ((*c_iter)->get_type()->is_container() ||
          (*c_iter)->get_type()->is_struct()) {
        print_const_value(f_impl_,
             cocoa_prefix_+(*c_iter)->get_name(),
             (*c_iter)->get_type(),
             (*c_iter)->get_value(),
             false, false);
        f_impl_ << ";" << endl;
      }
    }
    scope_down(f_impl_);
  
    // getter method for each constant
    for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
      string name = (*c_iter)->get_name();
      t_type* type = (*c_iter)->get_type();
      f_impl_ <<
        "+ (" << type_name(type) << ") " << name;
      scope_up(f_impl_);
      indent(f_impl_) << "return " << cocoa_prefix_ << name << ";" << endl;
      scope_down(f_impl_);
    }
  
    f_impl_ << "@end" << endl << endl;
  }
  
  
  /**
   * Generates a struct definition for a thrift data type. This is a class
   * with protected data members, read(), write(), and getters and setters.
   *
   * @param tstruct The struct definition
   */
  void t_cocoa_generator::generate_struct(t_struct* tstruct) {
    generate_cocoa_struct_interface(f_header_, tstruct, false);
    generate_cocoa_struct_implementation(f_impl_, tstruct, false);
  }
  
  /**
   * Exceptions are structs, but they inherit from NSException
   *
   * @param tstruct The struct definition
   */
  void t_cocoa_generator::generate_xception(t_struct* txception) {
    generate_cocoa_struct_interface(f_header_, txception, true);
    generate_cocoa_struct_implementation(f_impl_, txception, true);
  }
  
  
  /**
   * Generate the interface for a struct
   *
   * @param tstruct The struct definition
   */
  void t_cocoa_generator::generate_cocoa_struct_interface(ofstream &out,
                                                        t_struct* tstruct,
                                                        bool is_exception) {
    out << "@interface " << cocoa_prefix_ << tstruct->get_name() << " : ";
  
    if (is_exception) {
      out << "NSException ";
    } else {
      out << kStructInheritanceRootObjectName;
    }
    out << " <TBase, NSCoding> ";
  
    scope_up(out);
  
    // members are protected.  this is redundant, but explicit.
    //  f_header_ << endl << "@protected:" << endl;
  
    const vector<t_field*>& members = tstruct->get_members();
  
    // member varialbes
    vector<t_field*>::const_iterator m_iter;
    for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
      out << indent() << declare_field(*m_iter) << endl;
    }
  
    if (members.size() > 0) {
      out << endl;
      // isset fields
      for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
        indent(out) <<
          "BOOL " << kFieldPrefix << (*m_iter)->get_name() << kSetPostfix << ";" <<  endl;
      }
    }
  
    scope_down(out);
    out << endl;
  
    // properties
    if (members.size() > 0) {
      // out << "#if TARGET_OS_IPHONE || (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)" << endl;
      for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
        out << indent() << declare_property(*m_iter) << endl;
      }
      // out << "#endif" << endl;
      out << endl;
    }
  
    // default initializer
    out << indent() << "- (id) init;" << endl;
  
    // initializer for all fields
    if (!members.empty()) {
      generate_cocoa_struct_initializer_signature(out, tstruct);
      out << ";" << endl;
    }
    // read and write
    out << "- (void) read: (id <TProtocol>) inProtocol;" << endl;
    out << "- (void) write: (id <TProtocol>) outProtocol;" << endl;
    // validator
    out << "- (void) validate;" << endl << endl;
  
    // getters and setters
    generate_cocoa_struct_field_accessor_declarations(out, tstruct,
                    false,
                    false,
                    true,
                    is_exception);
  
    out << "@end" << endl << endl;
  }
  
  
  /**
   * Generate signature for initializer of struct with a parameter for
   * each field.
   */
  void t_cocoa_generator::generate_cocoa_struct_initializer_signature(ofstream &out,
                                                                    t_struct* tstruct) {
    const vector<t_field*>& members = tstruct->get_members();
    vector<t_field*>::const_iterator m_iter;
    indent(out) << "- (id) initWith";
    for (m_iter = members.begin(); m_iter != members.end(); ) {
      if (m_iter == members.begin()) {
        out << capitalize((*m_iter)->get_name());
      } else {
        out << (*m_iter)->get_name();
      }
      out << ": (";
      if (nullability_ && type_can_be_null(((*m_iter)->get_type()))) {
        out << ((*m_iter)->get_req() == t_field::T_REQUIRED ?
            "nonnull " : "nullable ");
      }
      out << type_name((*m_iter)->get_type()) << ") " <<
        (*m_iter)->get_name();
      ++m_iter;
      if (m_iter != members.end()) {
        out << " ";
      }
    }
  }
  
  /**
   * Generate getter and setter declarations for all fields, plus an
   * IsSet getter.
   */
  void t_cocoa_generator::generate_cocoa_struct_field_accessor_declarations(ofstream &out,
                                                                            t_struct* tstruct,
                                                                            bool is_declare_getter,
                                                                            bool is_declare_setter,
                                                                            bool is_declare_isset_getter,
                                                                            bool is_exception) {
    (void) is_exception;
    const vector<t_field*>& members = tstruct->get_members();
    vector<t_field*>::const_iterator m_iter;
    for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
      // out << indent() << "#if !__has_feature(objc_arc)" << endl
      if (is_declare_getter) {
        out << indent() << "- (" << type_name((*m_iter)->get_type()) << ") " << decapitalize((*m_iter)->get_name())
                << ";" << endl;
      }
  
      if (is_declare_setter) {
        out << indent() << "- (void) set" << capitalize((*m_iter)->get_name()) <<
          ": (" << type_name((*m_iter)->get_type()) << ") " << (*m_iter)->get_name()
                << ";" << endl;
      }
      // out << indent() << "#endif" << endl;
      if (is_declare_isset_getter) {
        out << indent() << "- (BOOL) " << (*m_iter)->get_name() << "IsSet"
                << ";" << endl;
      }
    }
  }
  
  
  /**
   * Generate the initWithCoder method for this struct so it's compatible with
   * the NSCoding protocol
   */
  void t_cocoa_generator::generate_cocoa_struct_init_with_coder_method(ofstream &out,
                                                                       t_struct* tstruct,
                                                                       bool is_exception)
  {
    indent(out) << "- (id) initWithCoder: (NSCoder *) decoder" << endl;
    scope_up(out);
    if (is_exception) {
      // NSExceptions conform to NSCoding, so we can call super
      out << indent() << "self = [super initWithCoder: decoder];" << endl;
    } else {
      out << indent() << "self = [super init];" << endl;
    }
  
    const vector<t_field*>& members = tstruct->get_members();
    vector<t_field*>::const_iterator m_iter;
  
    for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
      t_type* t = get_true_type((*m_iter)->get_type());
      out << indent() << "if ([decoder containsValueForKey: @\""<< (*m_iter)->get_name() <<"\"])" << endl;
      scope_up(out);
      out << indent() << kFieldPrefix << (*m_iter)->get_name() << " = ";
      if (type_can_be_null(t))
      {
        out << "[[decoder decodeObjectForKey: @\"" << (*m_iter)->get_name() << "\"] retain_stub];" << endl;
      }
      else if (t->is_enum())
      {
        out << "[decoder decodeIntForKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
      }
      else
      {
        t_base_type::t_base tbase = ((t_base_type *) t)->get_base();
        switch (tbase)
        {
          case t_base_type::TYPE_BOOL:
            out << "[decoder decodeBoolForKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
            break;
          case t_base_type::TYPE_BYTE:
            out << "[decoder decodeIntForKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
            break;
          case t_base_type::TYPE_I16:
            out << "[decoder decodeIntForKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
            break;
          case t_base_type::TYPE_I32:
            out << "[decoder decodeInt32ForKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
            break;
          case t_base_type::TYPE_I64:
            out << "[decoder decodeInt64ForKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
            break;
          case t_base_type::TYPE_DOUBLE:
            out << "[decoder decodeDoubleForKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
            break;
          default:
            throw "compiler error: don't know how to decode thrift type: " + t_base_type::t_base_name(tbase);
        }
      }
      out << indent() << kFieldPrefix << (*m_iter)->get_name() << kSetPostfix << " = YES;" << endl;
      scope_down(out);
    }
  
    out << indent() << "return self;" << endl;
    scope_down(out);
    out << endl;
  }
  
  
  /**
   * Generate the encodeWithCoder method for this struct so it's compatible with
   * the NSCoding protocol
   */
  void t_cocoa_generator::generate_cocoa_struct_encode_with_coder_method(ofstream &out,
                                                                         t_struct* tstruct,
                                                                         bool is_exception)
  {
    indent(out) << "- (void) encodeWithCoder: (NSCoder *) encoder" << endl;
    scope_up(out);
    if (is_exception) {
      // NSExceptions conform to NSCoding, so we can call super
      out << indent() << "[super encodeWithCoder: encoder];" << endl;
    }
  
    const vector<t_field*>& members = tstruct->get_members();
    vector<t_field*>::const_iterator m_iter;
  
    for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
      t_type* t = get_true_type((*m_iter)->get_type());
      out << indent() << "if ("<< kFieldPrefix << (*m_iter)->get_name() << kSetPostfix << ")" << endl;
      scope_up(out);
      //out << indent() << kFieldPrefix << (*m_iter)->get_name() << " = ";
      if (type_can_be_null(t))
      {
        out << indent() << "[encoder encodeObject: " << kFieldPrefix << (*m_iter)->get_name() << " forKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
      }
      else if (t->is_enum())
      {
        out << indent() << "[encoder encodeInt: " << kFieldPrefix << (*m_iter)->get_name() << " forKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
      }
      else
      {
        t_base_type::t_base tbase = ((t_base_type *) t)->get_base();
        switch (tbase)
        {
          case t_base_type::TYPE_BOOL:
            out << indent() << "[encoder encodeBool: " << kFieldPrefix << (*m_iter)->get_name() << " forKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
            break;
          case t_base_type::TYPE_BYTE:
            out << indent() << "[encoder encodeInt: " << kFieldPrefix << (*m_iter)->get_name() << " forKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
            break;
          case t_base_type::TYPE_I16:
            out << indent() << "[encoder encodeInt: " << kFieldPrefix << (*m_iter)->get_name() << " forKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
            break;
          case t_base_type::TYPE_I32:
            out << indent() << "[encoder encodeInt32: " << kFieldPrefix << (*m_iter)->get_name() << " forKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
            break;
          case t_base_type::TYPE_I64:
            out << indent() << "[encoder encodeInt64: " << kFieldPrefix << (*m_iter)->get_name() << " forKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
            break;
          case t_base_type::TYPE_DOUBLE:
            out << indent() << "[encoder encodeDouble: " << kFieldPrefix << (*m_iter)->get_name() << " forKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
            break;
          default:
            throw "compiler error: don't know how to encode thrift type: " + t_base_type::t_base_name(tbase);
        }
      }
      scope_down(out);
    }
  
    scope_down(out);
    out << endl;
  }
  
  /**
   * Generate the hash method for this struct
   */
  void t_cocoa_generator::generate_cocoa_struct_hash_method(ofstream& out) {
    indent(out) << "- (NSUInteger) hash" << endl;
    scope_up(out);
    out << indent() << "return 0;" << endl;
    scope_down(out);
    out << endl;
  }
  
  /**
   * Generate the isEqual method for this struct
   */
  void t_cocoa_generator::generate_cocoa_struct_is_equal_method(ofstream& out, t_struct* tstruct, bool is_exception) {
    indent(out) << "- (BOOL) isEqual: (id) anObject" << endl;
    scope_up(out);
  
    indent(out) << "if (self == anObject) {" << endl;
    indent_up();
    indent(out) << "return YES;" << endl;
    indent_down();
    indent(out) << "}" << endl;
  
    string class_name = cocoa_prefix_ + tstruct->get_name();
  
    if (is_exception) {
      indent(out) << "if (![super isEqual:anObject]) {" << endl;
      indent_up();
      indent(out) << "return NO;" << endl;
      indent_down();
      indent(out) << "}" << endl << endl;
    }
    else {
      indent(out) << "if (![anObject isKindOfClass:[" << class_name << " class]]) {" << endl;
      indent_up();
      indent(out) << "return NO;" << endl;
      indent_down();
      indent(out) << "}" << endl;
    }
  
    out << indent() << "return [[self toDict] isEqual:[anObject toDict]];" << endl;
    scope_down(out);
    out << endl;
  }
  
  /**
   * Generate struct implementation.
   *
   * @param tstruct      The struct definition
   * @param is_exception Is this an exception?
   * @param is_result    If this is a result it needs a different writer
   */
  void t_cocoa_generator::generate_cocoa_struct_implementation(ofstream &out,
                                                               t_struct* tstruct,
                                                               bool is_exception,
                                                               bool is_result) {
    indent(out) <<
      "@implementation " << cocoa_prefix_ << tstruct->get_name() << endl << endl;
  
    const vector<t_field*>& members = tstruct->get_members();
    vector<t_field*>::const_iterator m_iter;
  
    // exceptions need to call the designated initializer on NSException
    if (is_exception) {
      out << indent() << "- (instancetype) init" << endl;
      scope_up(out);
      out << indent() << "return [super initWithName: @\"" << cocoa_prefix_ << tstruct->get_name() <<
          "\" reason: @\"unknown\" userInfo: nil];" << endl;
      scope_down(out);
      out << endl;
    } else {
      // struct
  
      // default initializer
      // setup instance variables with default values
      indent(out) << "- (instancetype) init" << endl;
      scope_up(out);
      indent(out) << "self = [super init];" << endl;
      size_t num_members_with_values = 0;
      for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
        if ((*m_iter)->get_value() != NULL) num_members_with_values++;
      }
  
      if (num_members_with_values > 0) {
        // out << "#if TARGET_OS_IPHONE || (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)" << endl;
        for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
          t_type* t = get_true_type((*m_iter)->get_type());
          if ((*m_iter)->get_value() != NULL) {
            print_const_value(out, "self."+(*m_iter)->get_name(), t, (*m_iter)->get_value(), false, true);
          }
        }
        // out << "#endif" << endl;
      }
      indent(out) << "return self;" << endl;
      scope_down(out);
      out << endl;
    }
  
    // initializer with all fields as params
    if (!members.empty()) {
      generate_cocoa_struct_initializer_signature(out, tstruct);
      out << endl;
      scope_up(out);
      if (is_exception) {
        out << indent() << "self = [self init];" << endl;
      } else {
        out << indent() << "self = [super init];" << endl;
      }
  
      for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
        t_type* t = get_true_type((*m_iter)->get_type());
        out << indent() << kFieldPrefix << (*m_iter)->get_name() << " = ";
        if (type_can_be_null(t)) {
          // out << "[" << (*m_iter)->get_name() << " retain_stub];" << endl;
          out << (*m_iter)->get_name() << ";" << endl;
        } else {
          out << (*m_iter)->get_name() << ";" << endl;
        }
        out << indent() << kFieldPrefix << (*m_iter)->get_name() << kSetPostfix << " = YES;" << endl;
      }
  
      out << indent() << "return self;" << endl;
      scope_down(out);
      out << endl;
    }
  
    // initWithCoder for NSCoding
    generate_cocoa_struct_init_with_coder_method(out, tstruct, is_exception);
    // encodeWithCoder for NSCoding
    generate_cocoa_struct_encode_with_coder_method(out, tstruct, is_exception);
  
    // hash and isEqual for NSObject
    if (simple_value_equality_) {
      generate_cocoa_struct_hash_method(out);
      generate_cocoa_struct_is_equal_method(out, tstruct, is_exception);
    }
  
    // dealloc
    // if (!members.empty()) {
    //   out << "- (void) dealloc" << endl;
    //   scope_up(out);
    //   for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
    //     t_type* t = get_true_type((*m_iter)->get_type());
    //     if (type_can_be_null(t)) {
    //       indent(out) << "[" << kFieldPrefix << (*m_iter)->get_name() << " release_stub];" << endl;
    //     }
    //   }
    //   // out << indent() << "[super dealloc_stub];" << endl;
    //   scope_down(out);
    //   out << endl;
    // }
  
    // the rest of the methods
    generate_cocoa_struct_field_accessor_implementations(out, tstruct, is_exception);
    generate_cocoa_struct_reader(out, tstruct);
    if (is_result) {
      generate_cocoa_struct_result_writer(out, tstruct);
    } else {
      generate_cocoa_struct_writer(out, tstruct);
    }
    generate_cocoa_struct_validator(out, tstruct);
    generate_cocoa_struct_description(out, tstruct);
    generate_cocoa_struct_toDict(out, tstruct);
    generate_cocoa_struct_makeImmutable(out, tstruct);
    generate_cocoa_struct_mutableCopyWithZone(out, tstruct);
  
    out << "@end" << endl << endl;
  }
  
  
  /**
   * Generates a function to read all the fields of the struct.
   *
   * @param tstruct The struct definition
   */
  void t_cocoa_generator::generate_cocoa_struct_reader(ofstream& out,
                                                       t_struct* tstruct) {
    out <<
      "- (void) read: (id <TProtocol>) inProtocol" << endl;
    scope_up(out);
  
    const vector<t_field*>& fields = tstruct->get_members();
    vector<t_field*>::const_iterator f_iter;
  
    // Declare stack tmp variables
    indent(out) << "NSString * fieldName;" << endl;
    indent(out) << "int fieldType;" << endl;
    indent(out) << "int fieldID;" << endl;
    out << endl;
  
    indent(out) << "[inProtocol readStructBeginReturningName: NULL];" << endl;
  
    // Loop over reading in fields
    indent(out) <<
      "while (true)" << endl;
      scope_up(out);
  
      // Read beginning field marker
      indent(out) <<
        "[inProtocol readFieldBeginReturningName: &fieldName type: &fieldType fieldID: &fieldID];" << endl;
  
      // Check for field STOP marker and break
      indent(out) <<
        "if (fieldType == TType_STOP) { " << endl;
      indent_up();
      indent(out) <<
        "break;" << endl;
      indent_down();
      indent(out) <<
        "}" << endl;
  
      // Switch statement on the field we are reading
      indent(out) <<
        "switch (fieldID)" << endl;
  
        scope_up(out);
  
        // Generate deserialization code for known cases
        for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
          indent(out) <<
            "case " << (*f_iter)->get_key() << ":" << endl;
          indent_up();
          indent(out) <<
            "if (fieldType == " << type_to_enum((*f_iter)->get_type()) << ") {" << endl;
          indent_up();
  
          generate_deserialize_field(out, *f_iter, "fieldValue");
          indent(out) << call_field_setter(*f_iter, "fieldValue") << endl;
          // if this is an allocated field, release it since the struct
          // is now retaining it
          if (type_can_be_null((*f_iter)->get_type())) {
            // deserialized strings are autorelease, so don't release them
            if (!(get_true_type((*f_iter)->get_type())->is_string())) {
              indent(out) << "[fieldValue release_stub];" << endl;
            }
          }
  
          indent_down();
          out << indent() << "} else { " << endl;
          if (log_unexpected_) {
            out << indent() << "  NSLog(@\"%s: field ID %i has unexpected type %i.  Skipping.\", __PRETTY_FUNCTION__, fieldID, fieldType);" << endl;
          }
          out << indent() << "  [TProtocolUtil skipType: fieldType onProtocol: inProtocol];" << endl <<
            indent() << "}" << endl <<
            indent() << "break;" << endl;
          indent_down();
        }
  
        // In the default case we skip the field
        out << indent() << "default:" << endl;
        if (log_unexpected_) {
          out << indent() << "  NSLog(@\"%s: unexpected field ID %i with type %i.  Skipping.\", __PRETTY_FUNCTION__, fieldID, fieldType);" << endl;
        }
        out << indent() << "  [TProtocolUtil skipType: fieldType onProtocol: inProtocol];" << endl <<
          indent() << "  break;" << endl;
  
        scope_down(out);
  
      // Read field end marker
      indent(out) <<
        "[inProtocol readFieldEnd];" << endl;
  
      scope_down(out);
  
      out <<
        indent() << "[inProtocol readStructEnd];" << endl;
  
      // performs various checks (e.g. check that all required fields are set)
      if (validate_required_) {
        out <<
          indent() << "[self validate];" << endl;
      }
  
    indent_down();
    out <<
      indent() << "}" << endl <<
      endl;
  }
  
  /**
   * Generates a function to write all the fields of the struct
   *
   * @param tstruct The struct definition
   */
  void t_cocoa_generator::generate_cocoa_struct_writer(ofstream& out,
                                                       t_struct* tstruct) {
    out <<
      indent() << "- (void) write: (id <TProtocol>) outProtocol {" << endl;
    indent_up();
  
    string name = tstruct->get_name();
    const vector<t_field*>& fields = tstruct->get_members();
    vector<t_field*>::const_iterator f_iter;
  
    out <<
      indent() << "[outProtocol writeStructBeginWithName: @\"" << name << "\"];" << endl;
  
    for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
      out <<
        indent() << "if (" << kFieldPrefix << (*f_iter)->get_name() << kSetPostfix << ") {" << endl;
      indent_up();
      bool null_allowed = type_can_be_null((*f_iter)->get_type());
      if (null_allowed) {
        out <<
          indent() << "if (" << kFieldPrefix << (*f_iter)->get_name() << " != nil) {" << endl;
        indent_up();
      }
  
      indent(out) << "[outProtocol writeFieldBeginWithName: @\"" <<
        (*f_iter)->get_name() << "\" type: " << type_to_enum((*f_iter)->get_type()) <<
        " fieldID: " << (*f_iter)->get_key() << "];" << endl;
  
      // Write field contents
      generate_serialize_field(out, *f_iter, kFieldPrefix +(*f_iter)->get_name());
  
      // Write field closer
      indent(out) <<
        "[outProtocol writeFieldEnd];" << endl;
  
      if (null_allowed) {
        scope_down(out);
      }
      scope_down(out);
    }
    // Write the struct map
    out <<
      indent() << "[outProtocol writeFieldStop];" << endl <<
      indent() << "[outProtocol writeStructEnd];" << endl;
  
    indent_down();
    out <<
      indent() << "}" << endl <<
      endl;
  }
  
  /**
   * Generates a function to write all the fields of the struct, which
   * is a function result. These fields are only written if they are
   * set, and only one of them can be set at a time.
   *
   * @param tstruct The struct definition
   */
  void t_cocoa_generator::generate_cocoa_struct_result_writer(ofstream& out,
                                                              t_struct* tstruct) {
    out <<
      indent() << "- (void) write: (id <TProtocol>) outProtocol {" << endl;
    indent_up();
  
    string name = tstruct->get_name();
    const vector<t_field*>& fields = tstruct->get_members();
    vector<t_field*>::const_iterator f_iter;
  
    out <<
      indent() << "[outProtocol writeStructBeginWithName: @\"" << name << "\"];" << endl;
  
    bool first = true;
    for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
      if (first) {
        first = false;
        out <<
          endl <<
          indent() << "if ";
      } else {
        out <<
          " else if ";
      }
  
      out <<
        "(" << kFieldPrefix << (*f_iter)->get_name() << kSetPostfix << ") {" << endl;
      indent_up();
  
      bool null_allowed = type_can_be_null((*f_iter)->get_type());
      if (null_allowed) {
        out <<
          indent() << "if (" << kFieldPrefix << (*f_iter)->get_name() << " != nil) {" << endl;
        indent_up();
      }
  
      indent(out) << "[outProtocol writeFieldBeginWithName: @\"" <<
        (*f_iter)->get_name() << "\" type: " << type_to_enum((*f_iter)->get_type()) <<
        " fieldID: " << (*f_iter)->get_key() << "];" << endl;
  
      // Write field contents
      generate_serialize_field(out, *f_iter, kFieldPrefix+(*f_iter)->get_name());
  
      // Write field closer
      indent(out) <<
        "[outProtocol writeFieldEnd];" << endl;
  
      if (null_allowed) {
        indent_down();
        indent(out) << "}" << endl;
      }
  
      indent_down();
      indent(out) << "}";
    }
    // Write the struct map
    out <<
      endl <<
      indent() << "[outProtocol writeFieldStop];" << endl <<
      indent() << "[outProtocol writeStructEnd];" << endl;
  
    indent_down();
    out <<
      indent() << "}" << endl <<
      endl;
  }
  
  /**
   * Generates a function to perform various checks
   * (e.g. check that all required fields are set)
   *
   * @param tstruct The struct definition
   */
  void t_cocoa_generator::generate_cocoa_struct_validator(ofstream& out,
                                                          t_struct* tstruct) {
    out <<
      indent() << "- (void) validate {" << endl;
    indent_up();
  
    const vector<t_field*>& fields = tstruct->get_members();
    vector<t_field*>::const_iterator f_iter;
  
    out << indent() << "// check for required fields" << endl;
    for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
      t_field* field = (*f_iter);
      if ((*f_iter)->get_req() == t_field::T_REQUIRED) {
        out <<
          indent() << "if (!" << kFieldPrefix << field->get_name() << kSetPostfix << ") {" << endl <<
          indent() << "  @throw [TProtocolException exceptionWithName: @\"TProtocolException\"" << endl <<
          indent() << "                             reason: @\"Required field '" << (*f_iter)->get_name() << "' is not set.\"];" << endl <<
          indent() << "}" << endl;
      }
    }
  
    indent_down();
    out <<
      indent() << "}" << endl <<
      endl;
  }
  
  /**
   * Generate property accessor methods for all fields in the struct.
   * getter, setter, isset getter.
   *
   * @param tstruct The struct definition
   */
  void t_cocoa_generator::generate_cocoa_struct_field_accessor_implementations(ofstream& out,
                                                                               t_struct* tstruct,
                                                                               bool is_exception) {
    (void) is_exception;
    const vector<t_field*>& fields = tstruct->get_members();
    vector<t_field*>::const_iterator f_iter;
    for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
      t_field* field = *f_iter;
      t_type* type = get_true_type(field->get_type());
      const std::string field_name = field->get_name();
      std::string cap_name = field_name;
      cap_name[0] = toupper(cap_name[0]);
  
      // Simple getter
      indent(out) << "- (" << type_name(type) << ") ";
      out << field_name << " {" << endl;
      indent_up();
      if (!type_can_be_null(type)) {
        indent(out) << "return " << kFieldPrefix << field_name << ";" << endl;
      } else {
        indent(out) << "return " << kFieldPrefix << field_name << ";" << endl;
      }
      indent_down();
      indent(out) << "}" << endl << endl;
  
      // Simple setter
      indent(out) << "- (void) set" << cap_name << ": (" << type_name(type) <<
        ") " << field_name << " {" << endl;
      indent_up();
      indent(out) << "[self throwExceptionIfImmutable];" << endl;
      if (!type_can_be_null(type)) {
        indent(out) << kFieldPrefix << field_name << " = " << field_name << ";" << endl;
      } else {
        // indent(out) << "[" << field_name << " retain_stub];" << endl;
        // indent(out) << "[" << kFieldPrefix << field_name << " release_stub];" << endl;
        indent(out) << kFieldPrefix << field_name << " = " << field_name << ";" << endl;
      }
      indent(out) << kFieldPrefix << field_name << kSetPostfix << " = YES;" << endl;
      indent_down();
      indent(out) << "}" << endl << endl;
  
      // IsSet
      indent(out) << "- (BOOL) " << field_name << "IsSet {" << endl;
      indent_up();
      indent(out) << "return " << kFieldPrefix << field_name << kSetPostfix << ";" << endl;
      indent_down();
      indent(out) << "}" << endl << endl;
  
      // Unsetter - do we need this?
      indent(out) << "- (void) unset" << cap_name << " {" << endl;
      indent_up();
      if (type_can_be_null(type)) {
        // indent(out) << "[" << kFieldPrefix << field_name << " release_stub];" << endl;
        indent(out) << kFieldPrefix << field_name << " = nil;" << endl;
      }
      indent(out) << kFieldPrefix << field_name << kSetPostfix << " = NO;" << endl;
      indent_down();
      indent(out) << "}" << endl << endl;
    }
  }
  
  /**
   * Generates a description method for the given struct
   *
   * @param tstruct The struct definition
   */
  void t_cocoa_generator::generate_cocoa_struct_description(
      ofstream& out,
      t_struct* /*tstruct*/) {
    out << indent() << "- (NSString *) description {" << endl;
    indent_up();
    indent(out) << "return [[self toDict] description];" << endl;
    indent_down();
    indent(out) << "}" << endl << endl;
  }
  
  /**
   * Recursively call [makeImmutable] on all the fields
   */
  void t_cocoa_generator::generate_cocoa_struct_makeImmutable(std::ofstream& out, t_struct* tstruct) {
    out << indent() << "- (BOOL) makeImmutable {" << endl;
    indent_up();
    out << indent() << "const BOOL wasImmutable = [self isImmutable];" << endl;
  
    out << indent() << "if (!wasImmutable) {" << endl;
    indent_up();
  
    const vector<t_field*>& fields = tstruct->get_members();
    for (vector<t_field*>::const_iterator f_iter = fields.begin();
                    f_iter != fields.end();
                    ++f_iter)
    {
       t_field* field = (*f_iter);
       t_type* ttype = field->get_type();
       string field_name = kFieldPrefix + field->get_name();
       if (ttype->is_typedef()) {
         ttype = get_true_type(ttype);
       }
       if (ttype->is_struct()) {
         out << indent() << "if (" << field_name << " && " << "![" << field_name << " isImmutable]" << ") {" << endl;
         indent_up();
         out << indent() << "[" << field_name << " makeImmutable];" << endl;
         indent_down();
         out << indent() << "}" << endl;
       }
       else if (ttype->is_base_type()) {
         // nothing.
       }
       else if (ttype->is_enum()) {
         // nothing
       }
       else if (ttype->is_list() || ttype->is_set()) {
         out << indent() << "if (" << field_name << ") {" << endl;
         indent_up();
         out << indent() << "for (id item in " << field_name << ") {" << endl;
         indent_up();
         out << indent() << "if ([item isKindOfClass:[TBaseStruct class]]) {[((TBaseStruct*)item) makeImmutable];}" << endl;
         // TODO:: can item be a list / map / set, in which case need to do [copy] on it
         indent_down();
         out << indent() << "}" << endl;
         out << indent() << field_name << " = " << "[" << field_name << " copy];" << endl;
         indent_down();
         out << indent() << "}" << endl;
       }
       else if (ttype->is_map()) {
         out << indent() << "if (" << field_name << ") {" << endl;
         indent_up();
         out << indent() << "for (NSString* k in " << field_name << ") {" << endl;
         indent_up();
         out << indent() << "id item = " << field_name << "[k];" << endl;
         out << indent() << "if ([item isKindOfClass:[TBaseStruct class]]) {[((TBaseStruct*)item) makeImmutable];}" << endl;
         // TODO:: can item be a list / map / set, in which case need to do [copy] on it
         indent_down();
         out << indent() << "}" << endl;
         out << indent() << field_name << " = " << "[" << field_name << " copy];" << endl;
         indent_down();
         out << indent() << "}" << endl;
       }
       else {
         std::cout << "WAT?! " << ttype->get_name() << std::endl;
         assert(false);
       }
    }
    out << indent() << "[super makeImmutable];" << endl;
    indent_down();
    out << indent() << "}" << endl;
  
    out << indent() << "return YES;" << endl;
    indent_down();
    indent(out) << "}" << endl << endl;
  }
  
  /**
   * Generates a toDict method
   *
   */
  void t_cocoa_generator::generate_cocoa_struct_toDict(ofstream& out,
                                                            t_struct* tstruct) {
    out << indent() << "- (NSDictionary *) toDict {" << endl;
    indent_up();
  
    out << indent() << "NSMutableDictionary *ret = [NSMutableDictionary dictionary];" << endl;
    indent(out) <<
            "ret[@\"" << kFieldPrefix << "struct_name\"]"
            << " = "
            << "@\"" + tstruct->get_name() + "\";"
            << endl;
  
    const vector<t_field*>& fields = tstruct->get_members();
    vector<t_field*>::const_iterator f_iter;
    for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter)
    {
       t_field* field = (*f_iter);
       t_type* ttype = field->get_type();
       string field_name = kFieldPrefix + field->get_name();
       string ret_equals = "ret[@\"" + field->get_name() + "\"] = ";
       if (ttype->is_typedef()) {
         ttype = get_true_type(ttype);
       }
  
       const bool check_for_null = ttype->is_struct() || ttype->is_string() || ttype->is_container();
  
       if (check_for_null) {
         out << indent() << "if (" << field_name << ") {" << endl;
         indent_up();
       }
  
       if (ttype->is_struct()) {
         out << indent() <<  ret_equals << "[" << field_name << " toDict];" << endl;
       }
       else if (ttype->is_string()) {
         out << indent() <<  ret_equals << field_name << ";" << endl;
       }
       else if (ttype->is_base_type() || ttype->is_enum()) {
         out << indent() <<  ret_equals << "@(" << field_name << ");" << endl;
         if (ttype->is_enum()) {
           string ToStringFunctionName = cocoa_prefix_ + ttype->get_name() + kToStringPostfix;
           out << indent() <<  "ret[@\"" + field->get_name() + "_str\"] = "
                           << ToStringFunctionName << "(" << field_name << ");" << endl;
         }
       }
       else if (ttype->is_list() || ttype->is_set()) {
         out << indent() << "NSMutableArray* a = [NSMutableArray array];" << endl;
         out << indent() << "for (id item in " << field_name << ") {" << endl;
         indent_up();
         out << indent() << "if ([item isKindOfClass:[TBaseStruct class]]) {[a addObject:[item toDict]];}" << endl;
         out << indent() << "else {[a addObject:item];}" << endl;
         indent_down();
         out << indent() << "}" << endl;
         out << indent() << ret_equals << "[a copy];" << endl;
       }
       else if (ttype->is_map()) {
         out << indent() << "NSMutableDictionary* d = [NSMutableDictionary dictionary];" << endl;
         out << indent() << "for (NSString* k in " << field_name << ") {" << endl;
         indent_up();
         out << indent() << "id item = " << field_name << "[k];" << endl;
         out << indent() << "if ([item isKindOfClass:[TBaseStruct class]]) {d[k] = [item toDict];}" << endl;
         out << indent() << "else {d[k] = item;}" << endl;
         indent_down();
         out << indent() << "}" << endl;
         out << indent() << ret_equals << "[d copy];" << endl;
       }
       else {
         std::cout << "WAT?! " << ttype->get_name() << std::endl;
         assert(false);
       }
  
       if (check_for_null) {
        indent_down();
         out << indent() << "}" << endl;
       }
    }
  
    out << indent() << "return [ret copy];" << endl;
    indent_down();
    indent(out) << "}" << endl << endl;
  }
  
  /**
   * Generate mutableCopyWithZone
   *
   */
  void t_cocoa_generator::generate_cocoa_struct_mutableCopyWithZone(ofstream& out, t_struct* tstruct) {
    out << indent() << "- (id) mutableCopyWithZone:(NSZone *)zone {" << endl;
    indent_up();
    out << indent() << cocoa_prefix_ << tstruct->get_name() << " *newCopy = [[[self class] alloc] init];;" << endl;
  
    const vector<t_field*>& fields = tstruct->get_members();
    vector<t_field*>::const_iterator f_iter;
    for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter)
    {
       t_field* field = (*f_iter);
       t_type* ttype = field->get_type();
       string field_name = kFieldPrefix + field->get_name();
       if (ttype->is_typedef()) {
         ttype = get_true_type(ttype);
       }
  
       const bool check_for_null = ttype->is_struct() || ttype->is_string() || ttype->is_container();
  
       if (check_for_null) {
         out << indent() << "if (" << field_name << ") {" << endl;
         indent_up();
       }
  
       if (ttype->is_struct() || ttype->is_list() || ttype->is_set() || ttype->is_map()) {
         out << indent() << "newCopy->" << field_name
                         << " = "
                         << "[self->" << field_name
                         << " mutableCopyWithZone:zone];"
                         << endl;
       }
       else if (ttype->is_string() || ttype->is_base_type() || ttype->is_enum()) {
         out << indent() << "newCopy->" << field_name
                         << " = "
                         << "self->" << field_name
                         << ";"
                         << endl;
       }
       else {
         std::cout << "WAT?! " << ttype->get_name() << std::endl;
         assert(false);
       }
       if (check_for_null) {
         indent_down();
         out << indent() << "}" << endl;
       }
       out << indent() << "newCopy->" << field_name << kSetPostfix
                         << " = "
                         << "self->" << field_name << kSetPostfix
                         << ";"
                         << endl;
    }
  
    out << indent() << "return newCopy;" << endl;
    indent_down();
    indent(out) << "}" << endl << endl;
  }
  
  
  /**
   * Generates a thrift service.  In Objective-C this consists of a
   * protocol definition, a client interface and a client implementation.
   *
   * @param tservice The service definition
   */
  void t_cocoa_generator::generate_service(t_service* tservice) {
    generate_cocoa_service_protocol(f_header_, tservice);
    generate_cocoa_service_client_interface(f_header_, tservice);
    generate_cocoa_service_server_interface(f_header_, tservice);
    generate_cocoa_service_helpers(tservice);
    generate_cocoa_service_client_implementation(f_impl_, tservice);
    generate_cocoa_service_server_implementation(f_impl_, tservice);
  }
  
  
  /**
   * Generates structs for all the service return types
   *
   * @param tservice The service
   */
  void t_cocoa_generator::generate_cocoa_service_helpers(t_service* tservice) {
    vector<t_function*> functions = tservice->get_functions();
    vector<t_function*>::iterator f_iter;
    for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {
      t_struct* ts = (*f_iter)->get_arglist();
      generate_cocoa_struct_interface(f_impl_, ts, false);
      generate_cocoa_struct_implementation(f_impl_, ts, false, false);
      generate_function_helpers(*f_iter);
    }
  }
  
  string t_cocoa_generator::function_result_helper_struct_type(t_function* tfunction) {
    if (tfunction->is_oneway()) {
      return capitalize(tfunction->get_name());
    } else {
      return capitalize(tfunction->get_name()) + "_result";
    }
  }
  
  
  string t_cocoa_generator::function_args_helper_struct_type(t_function* tfunction) {
    return tfunction->get_name() + "_args";
  }
  
  
  /**
   * Generates a struct and helpers for a function.
   *
   * @param tfunction The function
   */
  void t_cocoa_generator::generate_function_helpers(t_function* tfunction) {
    if (tfunction->is_oneway()) {
      return;
    }
  
    // create a result struct with a success field of the return type,
    // and a field for each type of exception thrown
    t_struct result(program_, function_result_helper_struct_type(tfunction));
    t_field success(tfunction->get_returntype(), "success", 0);
    if (!tfunction->get_returntype()->is_void()) {
      result.append(&success);
    }
  
    t_struct* xs = tfunction->get_xceptions();
    const vector<t_field*>& fields = xs->get_members();
    vector<t_field*>::const_iterator f_iter;
    for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
      result.append(*f_iter);
    }
  
    // generate the result struct
    generate_cocoa_struct_interface(f_impl_, &result, false);
    generate_cocoa_struct_implementation(f_impl_, &result, false, true);
  }
  
  
  /**
   * Generates a service protocol definition.
   *
   * @param tservice The service to generate a protocol definition for
   */
  void t_cocoa_generator::generate_cocoa_service_protocol(ofstream& out,
                                                          t_service* tservice) {
    out << "@protocol " << cocoa_prefix_ << tservice->get_name() << " <NSObject>" << endl;
  
    vector<t_function*> functions = tservice->get_functions();
    vector<t_function*>::iterator f_iter;
    for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {
      out << "- " << function_signature(*f_iter) << ";" <<
        "  // throws ";
      t_struct* xs = (*f_iter)->get_xceptions();
      const std::vector<t_field*>& xceptions = xs->get_members();
      vector<t_field*>::const_iterator x_iter;
      for (x_iter = xceptions.begin(); x_iter != xceptions.end(); ++x_iter) {
        out << type_name((*x_iter)->get_type()) + ", ";
      }
      out << "TException" << endl;
    }
    out << "@end" << endl << endl;
  }
  
  
  /**
   * Generates a service client interface definition.
   *
   * @param tservice The service to generate a client interface definition for
   */
  void t_cocoa_generator::generate_cocoa_service_client_interface(ofstream& out,
                                                                  t_service* tservice) {
    out << "@interface " << cocoa_prefix_ << tservice->get_name() << "Client : NSObject <" <<
      cocoa_prefix_ << tservice->get_name() << "> ";
  
    scope_up(out);
    out << indent() << "id <TProtocol> inProtocol;" << endl;
    out << indent() << "id <TProtocol> outProtocol;" << endl;
    scope_down(out);
  
    out << "- (id) initWithProtocol: (id <TProtocol>) protocol;" << endl;
    out << "- (id) initWithInProtocol: (id <TProtocol>) inProtocol outProtocol: (id <TProtocol>) outProtocol;" << endl;
    out << "@end" << endl << endl;
  }
  
  
  /**
   * Generates a service server interface definition. In other words, the TProcess implementation for the
   * service definition.
   *
   * @param tservice The service to generate a client interface definition for
   */
  void t_cocoa_generator::generate_cocoa_service_server_interface(ofstream& out,
                                                                  t_service* tservice) {
    out << "@interface " << cocoa_prefix_ << tservice->get_name() << "Processor : NSObject <TProcessor> ";
  
    scope_up(out);
    out << indent() << "id <" << cocoa_prefix_ << tservice->get_name() <<"> mService;" << endl;
    out << indent() << "NSDictionary * mMethodMap;" << endl;
    scope_down(out);
  
    out << "- (id) initWith" << tservice->get_name() << ": (id <" << cocoa_prefix_ << tservice->get_name() << ">) service;" << endl;
    out << "- (id<"<<cocoa_prefix_ << tservice->get_name() << ">) service;" << endl;
  
    out << "@end" << endl << endl;
  }
  
  
  /**
   * Generates a service client implementation.
   *
   * @param tservice The service to generate an implementation for
   */
  void t_cocoa_generator::generate_cocoa_service_client_implementation(ofstream& out,
                                                                       t_service* tservice) {
    out << "@implementation " << cocoa_prefix_ << tservice->get_name() << "Client" << endl;
  
    // initializers
    out << "- (id) initWithProtocol: (id <TProtocol>) protocol" << endl;
    scope_up(out);
    out << indent() << "return [self initWithInProtocol: protocol outProtocol: protocol];" << endl;
    scope_down(out);
    out << endl;
  
    out << "- (id) initWithInProtocol: (id <TProtocol>) anInProtocol outProtocol: (id <TProtocol>) anOutProtocol" << endl;
    scope_up(out);
    out << indent() << "self = [super init];" << endl;
    out << indent() << "inProtocol = [anInProtocol retain_stub];" << endl;
    out << indent() << "outProtocol = [anOutProtocol retain_stub];" << endl;
    out << indent() << "return self;" << endl;
    scope_down(out);
    out << endl;
  
    // dealloc
    out << "- (void) dealloc" << endl;
    scope_up(out);
    out << indent() << "[inProtocol release_stub];" << endl;
    out << indent() << "[outProtocol release_stub];" << endl;
    out << indent() << "[super dealloc_stub];" << endl;
    scope_down(out);
    out << endl;
  
    // generate client method implementations
    vector<t_function*> functions = tservice->get_functions();
    vector<t_function*>::const_iterator f_iter;
    for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {
      string funname = (*f_iter)->get_name();
  
      t_function send_function(g_type_void,
                               string("send_") + (*f_iter)->get_name(),
                               (*f_iter)->get_arglist());
  
      string argsname = (*f_iter)->get_name() + "_args";
  
      // Open function
      indent(out) <<
        "- " << function_signature(&send_function) << endl;
      scope_up(out);
  
      // Serialize the request
      out <<
        indent() << "[outProtocol writeMessageBeginWithName: @\"" << funname << "\"" <<
        " type: TMessageType_CALL" <<
        " sequenceID: 0];" << endl;
  
      out <<
        indent() << "[outProtocol writeStructBeginWithName: @\"" << argsname << "\"];" << endl;
  
      // write out function parameters
      t_struct* arg_struct = (*f_iter)->get_arglist();
      const vector<t_field*>& fields = arg_struct->get_members();
      vector<t_field*>::const_iterator fld_iter;
      for (fld_iter = fields.begin(); fld_iter != fields.end(); ++fld_iter) {
        string fieldName = (*fld_iter)->get_name();
        if (type_can_be_null((*fld_iter)->get_type())) {
          out << indent() << "if (" << fieldName << " != nil)";
          scope_up(out);
        }
        out <<
          indent() << "[outProtocol writeFieldBeginWithName: @\"" << fieldName << "\""
          " type: " << type_to_enum((*fld_iter)->get_type()) <<
          " fieldID: " << (*fld_iter)->get_key() << "];" << endl;
  
        generate_serialize_field(out, *fld_iter, fieldName);
  
        out <<
          indent() << "[outProtocol writeFieldEnd];" << endl;
  
        if (type_can_be_null((*fld_iter)->get_type())) {
          scope_down(out);
        }
      }
  
      out <<
        indent() << "[outProtocol writeFieldStop];" << endl;
      out <<
        indent() << "[outProtocol writeStructEnd];" << endl;
  
      out <<
        indent() << "[outProtocol writeMessageEnd];" << endl <<
        indent() << "[[outProtocol transport] flush];" << endl;
  
      scope_down(out);
      out << endl;
  
      if (!(*f_iter)->is_oneway()) {
        t_struct noargs(program_);
        t_function recv_function((*f_iter)->get_returntype(),
                                 string("recv_") + (*f_iter)->get_name(),
                                 &noargs,
                                 (*f_iter)->get_xceptions());
        // Open function
        indent(out) <<
          "- " << function_signature(&recv_function) << endl;
        scope_up(out);
  
        // TODO(mcslee): Message validation here, was the seqid etc ok?
  
        // check for an exception
        out <<
          indent() << "int msgType = 0;" << endl <<
          indent() << "[inProtocol readMessageBeginReturningName: nil type: &msgType sequenceID: NULL];" << endl <<
          indent() << "if (msgType == TMessageType_EXCEPTION) {" << endl <<
          indent() << "  TApplicationException * x = [TApplicationException read: inProtocol];" << endl <<
          indent() << "  [inProtocol readMessageEnd];" << endl <<
          indent() << "  @throw x;" << endl <<
          indent() << "}" << endl;
  
        // FIXME - could optimize here to reduce creation of temporary objects.
        string resultname = function_result_helper_struct_type(*f_iter);
        out <<
          indent() << cocoa_prefix_ << resultname << " * result = [[[" << cocoa_prefix_ <<
          resultname << " alloc] init] autorelease_stub];" << endl;
        indent(out) << "[result read: inProtocol];" << endl;
        indent(out) << "[inProtocol readMessageEnd];" << endl;
  
        // Careful, only return _result if not a void function
        if (!(*f_iter)->get_returntype()->is_void()) {
          out <<
            indent() << "if ([result successIsSet]) {" << endl <<
            indent() << "  return [result success];" << endl <<
            indent() << "}" << endl;
        }
  
        t_struct* xs = (*f_iter)->get_xceptions();
        const std::vector<t_field*>& xceptions = xs->get_members();
        vector<t_field*>::const_iterator x_iter;
        for (x_iter = xceptions.begin(); x_iter != xceptions.end(); ++x_iter) {
          out <<
            indent() << "if ([result " << (*x_iter)->get_name() << "IsSet]) {" << endl <<
            indent() << "  @throw [result " << (*x_iter)->get_name() << "];" << endl <<
            indent() << "}" << endl;
        }
  
        // If you get here it's an exception, unless a void function
        if ((*f_iter)->get_returntype()->is_void()) {
          indent(out) <<
            "return;" << endl;
        } else {
          out <<
            indent() << "@throw [TApplicationException exceptionWithType: TApplicationException_MISSING_RESULT" << endl <<
            indent() << "                                         reason: @\"" << (*f_iter)->get_name() << " failed: unknown result\"];" << endl;
        }
  
        // Close function
        scope_down(out);
        out << endl;
      }
  
      // Open function
      indent(out) <<
        "- " << function_signature(*f_iter) << endl;
      scope_up(out);
      indent(out) <<
        "[self send_" << funname;
  
      // Declare the function arguments
      bool first = true;
      for (fld_iter = fields.begin(); fld_iter != fields.end(); ++fld_iter) {
        string fieldName = (*fld_iter)->get_name();
        out << " ";
        if (first) {
          first = false;
          out << ": " << fieldName;
        } else {
          out << fieldName << ": " << fieldName;
        }
      }
      out << "];" << endl;
  
      if (!(*f_iter)->is_oneway()) {
        out << indent();
        if (!(*f_iter)->get_returntype()->is_void()) {
          out << "return ";
        }
        out <<
          "[self recv_" << funname << "];" << endl;
      }
      scope_down(out);
      out << endl;
    }
  
    indent_down();
  
    out << "@end" << endl << endl;
  }
  
  
  /**
   * Generates a service server implementation.  In other words the actual TProcessor implementation
   * for the service.
   *
   * @param tservice The service to generate an implementation for
   */
  void t_cocoa_generator::generate_cocoa_service_server_implementation(ofstream& out,
                                                                       t_service* tservice) {
    out << "@implementation " << cocoa_prefix_ << tservice->get_name() << "Processor" << endl;
    indent_up();
  
    // initializer
    out << endl;
    out << "- (id) initWith" << tservice->get_name() << ": (id <" << cocoa_prefix_ << tservice->get_name() << ">) service" << endl;
    scope_up(out);
    out << indent() << "self = [super init];" << endl;
    out << indent() << "if (!self) {" << endl;
    out << indent() << "  return nil;" << endl;
    out << indent() << "}" << endl;
    // out << indent() << "mService = [service retain_stub];" << endl;
    // out << indent() << "mMethodMap = [[NSMutableDictionary dictionary] retain_stub];" << endl;
  
    // generate method map for routing incoming calls
    vector<t_function*> functions = tservice->get_functions();
    vector<t_function*>::const_iterator f_iter;
    for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {
      string funname = (*f_iter)->get_name();
      scope_up(out);
      out << indent() << "SEL s = @selector(process_" << funname << "_withSequenceID:inProtocol:outProtocol:);" << endl;
      out << indent() << "NSMethodSignature * sig = [self methodSignatureForSelector: s];" << endl;
      out << indent() << "NSInvocation * invocation = [NSInvocation invocationWithMethodSignature: sig];" << endl;
      out << indent() << "[invocation setSelector: s];" << endl;
      out << indent() << "[invocation retainArguments];" << endl;
      out << indent() << "[mMethodMap setValue: invocation forKey: @\"" << funname << "\"];" << endl;
      scope_down(out);
    }
    out << indent() << "return self;" << endl;
    scope_down(out);
  
    // implementation of the 'service' method which returns the service associated with this
    // processor
    out << endl;
    out << indent() << "- (id<"<<cocoa_prefix_ << tservice->get_name() << ">) service" << endl;
    out << indent() << "{" << endl;
    out << indent() << "  return [[mService retain_stub] autorelease_stub];" << endl;
    out << indent() << "}" << endl;
  
    // implementation of the TProcess method, which dispatches the incoming call using the method map
    out << endl;
    out << indent() << "- (BOOL) processOnInputProtocol: (id <TProtocol>) inProtocol" << endl;
    out << indent() << "                 outputProtocol: (id <TProtocol>) outProtocol" <<endl;
    out << indent() << "{" << endl;
    out << indent() << "  NSString * messageName;" << endl;
    out << indent() << "  int messageType;" << endl;
    out << indent() << "  int seqID;" << endl;
    out << indent() << "  [inProtocol readMessageBeginReturningName: &messageName" << endl;
    out << indent() << "                                       type: &messageType" << endl;
    out << indent() << "                                 sequenceID: &seqID];" << endl;
    out << indent() << "  NSInvocation * invocation = [mMethodMap valueForKey: messageName];" << endl;
    out << indent() << "  if (invocation == nil) {" << endl;
    out << indent() << "    [TProtocolUtil skipType: TType_STRUCT onProtocol: inProtocol];" << endl;
    out << indent() << "    [inProtocol readMessageEnd];" << endl;
    out << indent() << "    TApplicationException * x = [TApplicationException exceptionWithType: TApplicationException_UNKNOWN_METHOD reason: [NSString stringWithFormat: @\"Invalid method name: '%@'\", messageName]];" << endl;
    out << indent() << "    [outProtocol writeMessageBeginWithName: messageName" << endl;
    out << indent() << "                                      type: TMessageType_EXCEPTION" << endl;
    out << indent() << "                                sequenceID: seqID];" << endl;
    out << indent() << "    [x write: outProtocol];" << endl;
    out << indent() << "    [outProtocol writeMessageEnd];" << endl;
    out << indent() << "    [[outProtocol transport] flush];" << endl;
    out << indent() << "    return YES;" << endl;
    out << indent() << "  }" << endl;
    out << indent() << "  // NSInvocation does not conform to NSCopying protocol" << endl;
    out << indent() << "  NSInvocation * i = [NSInvocation invocationWithMethodSignature: [invocation methodSignature]];" << endl;
    out << indent() << "  [i setSelector: [invocation selector]];" << endl;
    out << indent() << "  [i setArgument: &seqID atIndex: 2];" << endl;
    out << indent() << "  [i setArgument: &inProtocol atIndex: 3];" << endl;
    out << indent() << "  [i setArgument: &outProtocol atIndex: 4];" << endl;
    out << indent() << "  [i setTarget: self];" << endl;
    out << indent() << "  [i invoke];" << endl;
    out << indent() << "  return YES;" << endl;
    out << indent() << "}" << endl;
  
    // generate a process_XXXX method for each service function, which reads args, calls the service, and writes results
    functions = tservice->get_functions();
    for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {
      out << endl;
      string funname = (*f_iter)->get_name();
      out << indent() << "- (void) process_" << funname << "_withSequenceID: (int32_t) seqID inProtocol: (id<TProtocol>) inProtocol outProtocol: (id<TProtocol>) outProtocol" << endl;
      scope_up(out);
      string argstype = cocoa_prefix_ + function_args_helper_struct_type(*f_iter);
      out << indent() << argstype << " * args = [[" << argstype << " alloc] init];" << endl;
      out << indent() << "[args read: inProtocol];" << endl;
      out << indent() << "[inProtocol readMessageEnd];" << endl;
  
      // prepare the result if not oneway
      if (!(*f_iter)->is_oneway()) {
          string resulttype = cocoa_prefix_ + function_result_helper_struct_type(*f_iter);
          out << indent() << resulttype << " * result = [[" << resulttype << " alloc] init];" << endl;
      }
  
      // make the call to the actual service object
      out << indent();
      if (!(*f_iter)->get_returntype()->is_void()) {
        out << "[result setSuccess: ";
      }
      out << "[mService " << funname;
      // supplying arguments
      t_struct* arg_struct = (*f_iter)->get_arglist();
      const vector<t_field*>& fields = arg_struct->get_members();
      vector<t_field*>::const_iterator fld_iter;
      bool first = true;
      for (fld_iter = fields.begin(); fld_iter != fields.end(); ++fld_iter) {
        string fieldName = (*fld_iter)->get_name();
        if (first) {
          first = false;
          out << ": [args " << fieldName << "]";
        } else {
          out << " " << fieldName << ": [args " << fieldName << "]";
        }
      }
      out << "]";
      if (!(*f_iter)->get_returntype()->is_void()) {
        out << "]";
      }
      out << ";" << endl;
  
      // write out the result if not oneway
      if (!(*f_iter)->is_oneway()) {
          out << indent() << "[outProtocol writeMessageBeginWithName: @\"" << funname << "\"" << endl;
          out << indent() << "                                  type: TMessageType_REPLY" << endl;
          out << indent() << "                            sequenceID: seqID];" << endl;
          out << indent() << "[result write: outProtocol];" << endl;
          out << indent() << "[outProtocol writeMessageEnd];" << endl;
          out << indent() << "[[outProtocol transport] flush];" << endl;
          out << indent() << "[result release_stub];" << endl;
      }
      out << indent() << "[args release_stub];" << endl;
  
      scope_down(out);
    }
  
    // dealloc
    out << endl;
    out << "- (void) dealloc" << endl;
    scope_up(out);
    out << indent() << "[mService release_stub];" << endl;
    out << indent() << "[mMethodMap release_stub];" << endl;
    out << indent() << "[super dealloc_stub];" << endl;
    scope_down(out);
    out << endl;
  
    indent_down();
  
    out << "@end" << endl << endl;
  }
  
  
  /**
   * Deserializes a field of any type.
   *
   * @param tfield The field
   * @param fieldName The variable name for this field
   */
  void t_cocoa_generator::generate_deserialize_field(ofstream& out,
                                                     t_field* tfield,
                                                     string fieldName) {
    t_type* type = get_true_type(tfield->get_type());
  
    if (type->is_void()) {
      throw "CANNOT GENERATE DESERIALIZE CODE FOR void TYPE: " +
        tfield->get_name();
    }
  
    if (type->is_struct() || type->is_xception()) {
      generate_deserialize_struct(out,
                                  (t_struct*)type,
                                  fieldName);
    } else if (type->is_container()) {
      generate_deserialize_container(out, type, fieldName);
    } else if (type->is_base_type() || type->is_enum()) {
      indent(out) <<
        type_name(type) << " " << fieldName << " = [inProtocol ";
  
      if (type->is_base_type()) {
        t_base_type::t_base tbase = ((t_base_type*)type)->get_base();
        switch (tbase) {
        case t_base_type::TYPE_VOID:
          throw "compiler error: cannot serialize void field in a struct: " +
            tfield->get_name();
        case t_base_type::TYPE_STRING:
          if (((t_base_type*)type)->is_binary()) {
            out << "readBinary];";
          } else {
            out << "readString];";
          }
          break;
        case t_base_type::TYPE_BOOL:
          out << "readBool];";
          break;
        case t_base_type::TYPE_BYTE:
          out << "readByte];";
          break;
        case t_base_type::TYPE_I16:
          out << "readI16];";
          break;
        case t_base_type::TYPE_I32:
          out << "readI32];";
          break;
        case t_base_type::TYPE_I64:
          out << "readI64];";
          break;
        case t_base_type::TYPE_DOUBLE:
          out << "readDouble];";
          break;
        default:
          throw "compiler error: no Objective-C name for base type " + t_base_type::t_base_name(tbase);
        }
      } else if (type->is_enum()) {
        out << "readI32];";
      }
      out <<
        endl;
    } else {
      printf("DO NOT KNOW HOW TO DESERIALIZE FIELD '%s' TYPE '%s'\n",
             tfield->get_name().c_str(), type_name(type).c_str());
    }
  }
  
  /**
   * Generates an unserializer for a struct, allocates the struct and invokes read:
   */
  void t_cocoa_generator::generate_deserialize_struct(ofstream& out,
                                                      t_struct* tstruct,
                                                      string fieldName) {
    indent(out) << type_name(tstruct) << fieldName << " = [[" <<
      type_name(tstruct, true) << " alloc] init];" << endl;
    indent(out) << "[" << fieldName << " read: inProtocol];" << endl;
  }
  
  /**
   * Deserializes a container by reading its size and then iterating
   */
  void t_cocoa_generator::generate_deserialize_container(ofstream& out,
                                                         t_type* ttype,
                                                         string fieldName) {
    string size = tmp("_size");
    indent(out) << "int " << size << ";" << endl;
  
    // Declare variables, read header
    if (ttype->is_map()) {
      indent(out)
        << "[inProtocol readMapBeginReturningKeyType: NULL valueType: NULL size: &" <<
        size << "];" << endl;
      indent(out) << "NSMutableDictionary * " << fieldName <<
        " = [[NSMutableDictionary alloc] initWithCapacity: " << size << "];" << endl;
    } else if (ttype->is_set()) {
      indent(out)
        << "[inProtocol readSetBeginReturningElementType: NULL size: &" << size << "];" << endl;
      indent(out) << "NSMutableSet * " << fieldName <<
        " = [[NSMutableSet alloc] initWithCapacity: " << size << "];" << endl;
    } else if (ttype->is_list()) {
      indent(out)
        << "[inProtocol readListBeginReturningElementType: NULL size: &" << size << "];" << endl;
      indent(out) << "NSMutableArray * " << fieldName <<
        " = [[NSMutableArray alloc] initWithCapacity: " << size << "];" << endl;
    }
    // FIXME - the code above does not verify that the element types of
    // the containers being read match the element types of the
    // containers we are reading into.  Does that matter?
  
    // For loop iterates over elements
    string i = tmp("_i");
    indent(out) << "int " << i << ";" << endl <<
      indent() << "for (" << i << " = 0; " <<
      i << " < " << size << "; " <<
      "++" << i << ")" << endl;
  
      scope_up(out);
  
      if (ttype->is_map()) {
        generate_deserialize_map_element(out, (t_map*)ttype, fieldName);
      } else if (ttype->is_set()) {
        generate_deserialize_set_element(out, (t_set*)ttype, fieldName);
      } else if (ttype->is_list()) {
        generate_deserialize_list_element(out, (t_list*)ttype, fieldName);
      }
  
      scope_down(out);
  
    // Read container end
    if (ttype->is_map()) {
      indent(out) << "[inProtocol readMapEnd];" << endl;
    } else if (ttype->is_set()) {
      indent(out) << "[inProtocol readSetEnd];" << endl;
    } else if (ttype->is_list()) {
      indent(out) << "[inProtocol readListEnd];" << endl;
    }
  
  }
  
  
  /**
   * Take a variable of a given type and wrap it in code to make it
   * suitable for putting into a container, if necessary.  Basically,
   * wrap scaler primitives in NSNumber objects.
   */
  string t_cocoa_generator::containerize(t_type * ttype,
                                         string fieldName)
  {
    // FIXME - optimize here to avoid autorelease pool?
    ttype = get_true_type(ttype);
    if (ttype->is_enum()) {
      return "[NSNumber numberWithInt: " + fieldName + "]";
    } else if (ttype->is_base_type()) {
      t_base_type::t_base tbase = ((t_base_type*)ttype)->get_base();
      switch (tbase) {
      case t_base_type::TYPE_VOID:
        throw "can't containerize void";
      case t_base_type::TYPE_BOOL:
        return "[NSNumber numberWithBool: " + fieldName + "]";
      case t_base_type::TYPE_BYTE:
        return "[NSNumber numberWithUnsignedChar: " + fieldName + "]";
      case t_base_type::TYPE_I16:
        return "[NSNumber numberWithShort: " + fieldName + "]";
      case t_base_type::TYPE_I32:
        return "[NSNumber numberWithLong: " + fieldName + "]";
      case t_base_type::TYPE_I64:
        return "[NSNumber numberWithLongLong: " + fieldName + "]";
      case t_base_type::TYPE_DOUBLE:
        return "[NSNumber numberWithDouble: " + fieldName + "]";
      default:
        break;
      }
    }
  
    // do nothing
    return fieldName;
  }
  
  
  /**
   * Generates code to deserialize a map element
   */
  void t_cocoa_generator::generate_deserialize_map_element(ofstream& out,
                                                           t_map* tmap,
                                                           string fieldName) {
    string key = tmp("_key");
    string val = tmp("_val");
    t_type* keyType = tmap->get_key_type();
    t_type* valType = tmap->get_val_type();
    t_field fkey(keyType, key);
    t_field fval(valType, val);
  
    generate_deserialize_field(out, &fkey, key);
    generate_deserialize_field(out, &fval, val);
  
    indent(out) <<
      "[" << fieldName << " setObject: " << containerize(valType, val) <<
      " forKey: " << containerize(keyType, key) << "];" << endl;
  
    if (type_can_be_null(keyType)) {
      if (!(get_true_type(keyType)->is_string())) {
        indent(out) << "[" << containerize(keyType, key) << " release_stub];" << endl;
      }
    }
  
    if (type_can_be_null(valType)) {
      if (!(get_true_type(valType)->is_string())) {
        indent(out) << "[" << containerize(valType, val) << " release_stub];" << endl;
      }
    }
  }
  
  /**
   * Deserializes a set element
   */
  void t_cocoa_generator::generate_deserialize_set_element(ofstream& out,
                                                           t_set* tset,
                                                           string fieldName) {
    string elem = tmp("_elem");
    t_type* type = tset->get_elem_type();
    t_field felem(type, elem);
  
    generate_deserialize_field(out, &felem, elem);
  
    indent(out) <<
      "[" << fieldName << " addObject: " << containerize(type, elem) << "];" << endl;
  
    if (type_can_be_null(type)) {
      // deserialized strings are autorelease, so don't release them
      if (!(get_true_type(type)->is_string())) {
        indent(out) << "[" << containerize(type, elem) << " release_stub];" << endl;
      }
    }
  }
  
  /**
   * Deserializes a list element
   */
  void t_cocoa_generator::generate_deserialize_list_element(ofstream& out,
                                                            t_list* tlist,
                                                            string fieldName) {
    string elem = tmp("_elem");
    t_type* type = tlist->get_elem_type();
    t_field felem(type, elem);
  
    generate_deserialize_field(out, &felem, elem);
  
    indent(out) <<
      "[" << fieldName << " addObject: " << containerize(type, elem) << "];" << endl;
  
    if (type_can_be_null(type)) {
      if (!(get_true_type(type)->is_string())) {
        indent(out) << "[" << containerize(type, elem) << " release_stub];" << endl;
      }
    }
  }
  
  
  /**
   * Serializes a field of any type.
   *
   * @param tfield The field to serialize
   * @param fieldName Name to of the variable holding the field
   */
  void t_cocoa_generator::generate_serialize_field(ofstream& out,
                                                   t_field* tfield,
                                                   string fieldName) {
    t_type* type = get_true_type(tfield->get_type());
  
    // Do nothing for void types
    if (type->is_void()) {
      throw "CANNOT GENERATE SERIALIZE CODE FOR void TYPE: " +
        tfield->get_name();
    }
  
    if (type->is_struct() || type->is_xception()) {
      generate_serialize_struct(out,
                                (t_struct*)type,
                                fieldName);
    } else if (type->is_container()) {
      generate_serialize_container(out,
                                   type,
                                   fieldName);
    } else if (type->is_base_type() || type->is_enum()) {
      indent(out) <<
        "[outProtocol ";
  
      if (type->is_base_type()) {
        t_base_type::t_base tbase = ((t_base_type*)type)->get_base();
        switch (tbase) {
        case t_base_type::TYPE_VOID:
          throw
            "compiler error: cannot serialize void field in a struct: " + fieldName;
        case t_base_type::TYPE_STRING:
          if (((t_base_type*)type)->is_binary()) {
            out << "writeBinary: " << fieldName << "];";
          } else {
            out << "writeString: " << fieldName << "];";
          }
          break;
        case t_base_type::TYPE_BOOL:
          out << "writeBool: " << fieldName << "];";
          break;
        case t_base_type::TYPE_BYTE:
          out << "writeByte: " << fieldName << "];";
          break;
        case t_base_type::TYPE_I16:
          out << "writeI16: " << fieldName << "];";
          break;
        case t_base_type::TYPE_I32:
          out << "writeI32: " << fieldName << "];";
          break;
        case t_base_type::TYPE_I64:
          out << "writeI64: " << fieldName << "];";
          break;
        case t_base_type::TYPE_DOUBLE:
          out << "writeDouble: " << fieldName << "];";
          break;
        default:
          throw "compiler error: no Objective-C name for base type " + t_base_type::t_base_name(tbase);
        }
      } else if (type->is_enum()) {
        out << "writeI32: " << fieldName << "];";
      }
      out << endl;
    } else {
      printf("DO NOT KNOW HOW TO SERIALIZE FIELD '%s' TYPE '%s'\n",
             tfield->get_name().c_str(),
             type_name(type).c_str());
    }
  }
  
  /**
   * Serialize a struct.
   *
   * @param tstruct The struct to serialize
   * @param fieldName Name of variable holding struct
   */
  void t_cocoa_generator::generate_serialize_struct(ofstream& out,
                                                    t_struct* tstruct,
                                                    string fieldName) {
    (void) tstruct;
    out <<
      indent() << "[" << fieldName << " write: outProtocol];" << endl;
  }
  
  /**
   * Serializes a container by writing its size then the elements.
   *
   * @param ttype  The type of container
   * @param fieldName Name of variable holding container
   */
  void t_cocoa_generator::generate_serialize_container(ofstream& out,
                                                       t_type* ttype,
                                                       string fieldName) {
    scope_up(out);
  
    if (ttype->is_map()) {
      indent(out) <<
        "[outProtocol writeMapBeginWithKeyType: " <<
        type_to_enum(((t_map*)ttype)->get_key_type()) << " valueType: " <<
        type_to_enum(((t_map*)ttype)->get_val_type()) << " size: (int)[" <<
        fieldName << " count]];" << endl;
    } else if (ttype->is_set()) {
      indent(out) <<
        "[outProtocol writeSetBeginWithElementType: " <<
        type_to_enum(((t_set*)ttype)->get_elem_type()) << " size: (int)[" <<
        fieldName << " count]];" << endl;
    } else if (ttype->is_list()) {
      indent(out) <<
        "[outProtocol writeListBeginWithElementType: " <<
        type_to_enum(((t_list*)ttype)->get_elem_type()) << " size: (int)[" <<
        fieldName << " count]];" << endl;
    }
  
    string iter = tmp("_iter");
    string key;
    if (ttype->is_map()) {
      key = tmp("key");
      indent(out) << "NSEnumerator * " << iter << " = [" << fieldName << " keyEnumerator];" << endl;
      indent(out) << "id " << key << ";" << endl;
      indent(out) << "while ((" << key << " = [" << iter << " nextObject]))" << endl;
    } else if (ttype->is_set()) {
      key = tmp("obj");
      indent(out) << "NSEnumerator * " << iter << " = [" << fieldName << " objectEnumerator];" << endl;
      indent(out) << "id " << key << ";" << endl;
      indent(out) << "while ((" << key << " = [" << iter << " nextObject]))" << endl;
    } else if (ttype->is_list()) {
      key = tmp("i");
      indent(out) << "int " << key << ";" << endl;
      indent(out) <<
        "for (" << key << " = 0; " << key << " < [" << fieldName << " count]; " << key << "++)" << endl;
    }
  
      scope_up(out);
  
      if (ttype->is_map()) {
        generate_serialize_map_element(out, (t_map*)ttype, key, fieldName);
      } else if (ttype->is_set()) {
        generate_serialize_set_element(out, (t_set*)ttype, key);
      } else if (ttype->is_list()) {
        generate_serialize_list_element(out, (t_list*)ttype, key, fieldName);
      }
  
      scope_down(out);
  
      if (ttype->is_map()) {
        indent(out) <<
          "[outProtocol writeMapEnd];" << endl;
      } else if (ttype->is_set()) {
        indent(out) <<
          "[outProtocol writeSetEnd];" << endl;
      } else if (ttype->is_list()) {
        indent(out) <<
          "[outProtocol writeListEnd];" << endl;
      }
  
    scope_down(out);
  }
  
  /**
   * Given a field variable name, wrap it in code that converts it to a
   * primitive type, if necessary.
   */
  string t_cocoa_generator::decontainerize(t_field * tfield,
                                           string fieldName)
  {
    t_type * ttype = get_true_type(tfield->get_type());
    if (ttype->is_enum()) {
      return "[" + fieldName + " intValue]";
    } else if (ttype->is_base_type()) {
      t_base_type::t_base tbase = ((t_base_type*)ttype)->get_base();
      switch (tbase) {
      case t_base_type::TYPE_VOID:
        throw "can't decontainerize void";
      case t_base_type::TYPE_BOOL:
        return "[" + fieldName + " boolValue]";
      case t_base_type::TYPE_BYTE:
        return "[" + fieldName + " unsignedCharValue]";
      case t_base_type::TYPE_I16:
        return "[" + fieldName + " shortValue]";
      case t_base_type::TYPE_I32:
        return "[" + fieldName + " longValue]";
      case t_base_type::TYPE_I64:
        return "[" + fieldName + " longLongValue]";
      case t_base_type::TYPE_DOUBLE:
        return "[" + fieldName + " doubleValue]";
      default:
        break;
      }
    }
  
    // do nothing
    return fieldName;
  }
  
  
  /**
   * Serializes the members of a map.
   */
  void t_cocoa_generator::generate_serialize_map_element(ofstream& out,
                                                         t_map* tmap,
                                                         string key,
                                                         string mapName) {
    t_field kfield(tmap->get_key_type(), key);
    generate_serialize_field(out, &kfield, decontainerize(&kfield, key));
    t_field vfield(tmap->get_val_type(), "[" + mapName + " objectForKey: " + key + "]");
    generate_serialize_field(out, &vfield, decontainerize(&vfield, vfield.get_name()));
  }
  
  /**
   * Serializes the members of a set.
   */
  void t_cocoa_generator::generate_serialize_set_element(ofstream& out,
                                                         t_set* tset,
                                                         string elementName) {
    t_field efield(tset->get_elem_type(), elementName);
    generate_serialize_field(out, &efield, decontainerize(&efield, elementName));
  }
  
  /**
   * Serializes the members of a list.
   */
  void t_cocoa_generator::generate_serialize_list_element(ofstream& out,
                                                          t_list* tlist,
                                                          string index,
                                                          string listName) {
    t_field efield(tlist->get_elem_type(), "[" + listName + " objectAtIndex: " + index + "]");
    generate_serialize_field(out, &efield, decontainerize(&efield, efield.get_name()));
  }
  
  
  /**
   * Returns an Objective-C name
   *
   * @param ttype The type
   * @param class_ref Do we want a Class reference istead of a type reference?
   * @return Java type name, i.e. HashMap<Key,Value>
   */
  string t_cocoa_generator::type_name(t_type* ttype, bool class_ref) {
    if (ttype->is_typedef()) {
      const t_program* program = ttype->get_program();
      return program ? (program->get_namespace("cocoa") + ttype->get_name()) : ttype->get_name();
    }
  
    string result;
    if (ttype->is_base_type()) {
      return base_type_name((t_base_type*)ttype);
    } else if (ttype->is_enum()) {
      return cocoa_prefix_ + ttype->get_name();
    } else if (ttype->is_map()) {
      result = "TBaseStructDictionary";
    } else if (ttype->is_set()) {
      result = "TBaseStructSet";
    } else if (ttype->is_list()) {
      result = "TBaseStructArray";
    } else {
      // Check for prefix
      const t_program* program = ttype->get_program();
      if (program != NULL) {
        result = program->get_namespace("cocoa") + ttype->get_name();
      } else {
        result = ttype->get_name();
      }
    }
  
    if (!class_ref) {
      result += " *";
    }
    return result;
  }
  
  /**
   * Returns the Objective-C type that corresponds to the thrift type.
   *
   * @param tbase The base type
   */
  string t_cocoa_generator::base_type_name(t_base_type* type) {
    t_base_type::t_base tbase = type->get_base();
  
    switch (tbase) {
    case t_base_type::TYPE_VOID:
      return "void";
    case t_base_type::TYPE_STRING:
      if (type->is_binary()) {
        return "NSData *";
      } else {
        return "NSString *";
      }
    case t_base_type::TYPE_BOOL:
      return "BOOL";
    case t_base_type::TYPE_BYTE:
      return "uint8_t";
    case t_base_type::TYPE_I16:
      return"int16_t";
    case t_base_type::TYPE_I32:
      return "int32_t";
    case t_base_type::TYPE_I64:
      return"int64_t";
    case t_base_type::TYPE_DOUBLE:
      return "double";
    default:
      throw "compiler error: no Objective-C name for base type " + t_base_type::t_base_name(tbase);
    }
  }
  
  /**
   * Prints the value of a constant with the given type. Note that type checking
   * is NOT performed in this function as it is always run beforehand using the
   * validate_types method in main.cc
   */
  void t_cocoa_generator::print_const_value(
      std::ofstream& out,
      std::string name,
      t_type* type,
      const t_const_value* value,
      bool defval,
      bool is_property) {
    type = get_true_type(type);
  
    indent(out);
    if (type->is_base_type()) {
      string v2 = render_const_value(out, type, value);
      if (defval)
        out << type_name(type) << " ";
      out << name << " = " << v2 << ";" << endl << endl;
    } else if (type->is_enum()) {
      if (defval)
        out << type_name(type) << " ";
      out << name << " = " << render_const_value(out, type, value) << ";" << endl << endl;
    } else if (type->is_struct() || type->is_xception()) {
      const vector<t_field*>& fields = ((t_struct*)type)->get_members();
      vector<t_field*>::const_iterator f_iter;
      const vector<pair<t_const_value*, t_const_value*>>& val = value->get_map();
      vector<pair<t_const_value*, t_const_value*>>::const_iterator v_iter;
      if (defval)
        out << type_name(type) << " ";
      if (defval || is_property)
        out << name << " = [[[" << type_name(type, true) << " alloc] init] autorelease_stub];" << endl;
      else
        out << name << " = [[" << type_name(type, true) << " alloc] init];" << endl;
      for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
        t_type* field_type = NULL;
        for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
          if ((*f_iter)->get_name() == v_iter->first->get_string()) {
            field_type = (*f_iter)->get_type();
          }
        }
        if (field_type == NULL) {
          throw "type error: " + type->get_name() + " has no field " + v_iter->first->get_string();
        }
        string val = render_const_value(out, field_type, v_iter->second);
        std::string cap_name = capitalize(v_iter->first->get_string());
        indent(out) << "[" << name << " set" << cap_name << ":" << val << "];" << endl;
      }
      out << endl;
    } else if (type->is_map()) {
      t_type* ktype = ((t_map*)type)->get_key_type();
      t_type* vtype = ((t_map*)type)->get_val_type();
      const vector<pair<t_const_value*, t_const_value*>>& val = value->get_map();
      vector<pair<t_const_value*, t_const_value*>>::const_iterator v_iter;
      if (defval)
        out << "NSMutableDictionary *";
      if (defval || is_property)
        out << name << " = [[[NSMutableDictionary alloc] initWithCapacity:" << val.size() << "] autorelease_stub]; " << endl;
      else
        out << name << " = [[NSMutableDictionary alloc] initWithCapacity:" << val.size() << "]; " << endl;
      for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
        string key = render_const_value(out, ktype, v_iter->first, true);
        string val = render_const_value(out, vtype, v_iter->second, true);
        indent(out) << "[" << name << " setObject:" << val << " forKey:" << key << "];" << endl;
      }
      out << endl;
    } else if (type->is_list()) {
      t_type* etype = ((t_list*)type)->get_elem_type();
      const vector<t_const_value*>& val = value->get_list();
      vector<t_const_value*>::const_iterator v_iter;
      if (defval)
        out << "NSMutableArray *";
      if (defval || is_property)
        out << name << " = [[[NSMutableArray alloc] initWithCapacity:" << val.size() <<"] autorelease_stub];" << endl;
      else
        out << name << " = [[NSMutableArray alloc] initWithCapacity:" << val.size() <<"];" << endl;
      for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
        string val = render_const_value(out, etype, *v_iter, true);
        indent(out) << "[" << name << " addObject:" << val << "];" << endl;
      }
      out << endl;
    } else if (type->is_set()) {
      t_type* etype = ((t_set*)type)->get_elem_type();
      const vector<t_const_value*>& val = value->get_list();
      vector<t_const_value*>::const_iterator v_iter;
      if (defval)
        out << "NSMutableSet *";
      if (defval || is_property)
        out << name << " = [[[NSMutableSet alloc] initWithCapacity:" << val.size() << "] autorelease_stub];" << endl;
      else
        out << name << " = [[NSMutableSet alloc] initWithCapacity:" << val.size() << "];" << endl;
      for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
        string val = render_const_value(out, etype, *v_iter, true);
        indent(out) << "[" << name << " addObject:" << val << "];" << endl;
      }
      out << endl;
    } else {
      throw "compiler error: no const of type " + type->get_name();
    }
  }
  
  string t_cocoa_generator::render_const_value(
      ofstream& out,
      t_type* type,
      const t_const_value* value,
      bool containerize_it) {
    type = get_true_type(type);
    std::ostringstream render;
  
    if (type->is_base_type()) {
      t_base_type::t_base tbase = ((t_base_type*)type)->get_base();
      switch (tbase) {
      case t_base_type::TYPE_STRING:
        // We must handle binary constant but the syntax of IDL defines
        // nothing about binary constant.
        //   if ((t_base_type*)type)->is_binary())
        //      // binary code
        render << "@\"" << get_escaped_string(value) << '"';
        break;
      case t_base_type::TYPE_BOOL:
        render << ((value->get_integer() > 0) ? "YES" : "NO");
        break;
      case t_base_type::TYPE_BYTE:
      case t_base_type::TYPE_I16:
      case t_base_type::TYPE_I32:
      case t_base_type::TYPE_I64:
        render << value->get_integer();
        break;
      case t_base_type::TYPE_DOUBLE:
        if (value->get_type() == t_const_value::CV_INTEGER) {
          render << value->get_integer();
        } else {
          render << value->get_double();
        }
        break;
      default:
        throw "compiler error: no const of base type " + t_base_type::t_base_name(tbase);
      }
    } else if (type->is_enum()) {
      render << value->get_integer();
    } else {
      string t = tmp("tmp");
      print_const_value(out, t, type, value, true, false);
      render << t;
    }
  
    if (containerize_it) {
      return containerize(type, render.str());
    }
    return render.str();
  }
  
  #if 0
  /**
  ORIGINAL
   * Spit out code that evaluates to the specified constant value.
   */
  string t_cocoa_generator::render_const_value(string name,
                                               t_type* type,
                                               t_const_value* value,
                                               bool containerize_it) {
    type = get_true_type(type);
    std::ostringstream render;
  
    if (type->is_base_type()) {
      t_base_type::t_base tbase = ((t_base_type*)type)->get_base();
      switch (tbase) {
      case t_base_type::TYPE_STRING:
        render << "@\"" << get_escaped_string(value) << '"';
        break;
      case t_base_type::TYPE_BOOL:
        render << ((value->get_integer() > 0) ? "YES" : "NO");
        break;
      case t_base_type::TYPE_BYTE:
      case t_base_type::TYPE_I16:
      case t_base_type::TYPE_I32:
      case t_base_type::TYPE_I64:
        render << value->get_integer();
        break;
      case t_base_type::TYPE_DOUBLE:
        if (value->get_type() == t_const_value::CV_INTEGER) {
          render << value->get_integer();
        } else {
          render << value->get_double();
        }
        break;
      default:
        throw "compiler error: no const of base type " + t_base_type::t_base_name(tbase);
      }
    } else if (type->is_enum()) {
      render << value->get_integer();
    } else if (type->is_struct() || type->is_xception()) {
      const vector<t_field*>& fields = ((t_struct*)type)->get_members();
      vector<t_field*>::const_iterator f_iter;
      const map<t_const_value*, t_const_value*>& val = value->get_map();
      map<t_const_value*, t_const_value*>::const_iterator v_iter;
      if (val.size() > 0)
        render << "[[" << type_name(type, true) << " alloc] initWith";
      else
        render << "[[" << type_name(type, true) << " alloc] init";
      bool first = true;
      for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
        // FIXME The generated code does not match with initWithXXX
        //       initializer and causes compile error.
        //       Try: test/DebugProtoTest.thrift and test/SmallTest.thrift
        t_type* field_type = NULL;
        for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
          if ((*f_iter)->get_name() == v_iter->first->get_string()) {
            field_type = (*f_iter)->get_type();
          }
        }
        if (field_type == NULL) {
          throw "type error: " + type->get_name() + " has no field " + v_iter->first->get_string();
        }
        if (first) {
          render << capitalize(v_iter->first->get_string());
          first = false;
        } else {
          render << " " << v_iter->first->get_string();
        }
        render << ": " << render_const_value(name, field_type, v_iter->second);
      }
      render << "]";
    } else if (type->is_map()) {
      render << "[[NSDictionary alloc] initWithObjectsAndKeys: ";
      t_type* ktype = ((t_map*)type)->get_key_type();
      t_type* vtype = ((t_map*)type)->get_val_type();
      const map<t_const_value*, t_const_value*>& val = value->get_map();
      map<t_const_value*, t_const_value*>::const_iterator v_iter;
      bool first = true;
      for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
        string key = render_const_value(name, ktype, v_iter->first, true);
        string val = render_const_value(name, vtype, v_iter->second, true);
        if (first) {
          first = false;
        } else {
          render << ", ";
        }
        render << val << ", " << key;
      }
      if (first)
        render << " nil]";
      else
        render << ", nil]";
    } else if (type->is_list()) {
      render << "[[NSArray alloc] initWithObjects: ";
      t_type * etype = ((t_list*)type)->get_elem_type();
      const vector<t_const_value*>& val = value->get_list();
      bool first = true;
      vector<t_const_value*>::const_iterator v_iter;
      for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
        if (first) {
          first = false;
        } else {
          render << ", ";
        }
        render << render_const_value(name, etype, *v_iter, true);
      }
      if (first)
        render << " nil]";
      else
        render << ", nil]";
    } else if (type->is_set()) {
      render << "[[NSSet alloc] initWithObjects: ";
      t_type * etype = ((t_set*)type)->get_elem_type();
      const vector<t_const_value*>& val = value->get_list();
      bool first = true;
      vector<t_const_value*>::const_iterator v_iter;
      for (v_iter = val.begin(); v_iter != val.end(); ++v_iter) {
        if (first) {
          first = false;
        } else {
          render << ", ";
        }
        render << render_const_value(name, etype, *v_iter, true);
      }
      if (first)
        render << " nil]";
      else
        render << ", nil]";
    } else {
      throw "don't know how to render constant for type: " + type->get_name();
    }
  
    if (containerize_it) {
      return containerize(type, render.str());
    }
  
    return render.str();
  }
  #endif
  
  /**
   * Declares a field.
   *
   * @param ttype The type
   */
  string t_cocoa_generator::declare_field(t_field* tfield) {
    return type_name(tfield->get_type()) + " " + kFieldPrefix + tfield->get_name() + ";";
  }
  
  /**
   * Declares an Objective-C 2.0 property.
   *
   * @param tfield The field to declare a property for
   */
  string t_cocoa_generator::declare_property(t_field* tfield) {
    std::ostringstream render;
    render << "@property (nonatomic";
    if (type_can_be_null(tfield->get_type())) {
      render << ", retain";
      if (nullability_) {
        render << (tfield->get_req() == t_field::T_REQUIRED ?
            ", nonnull" : ", nullable");
      }
    }
    render
           // << ", getter=" << decapitalize(tfield->get_name())
           // << ", setter=set" << capitalize(tfield->get_name()) + ":"
           << ")"
           << " " << type_name(tfield->get_type()) << " " << tfield->get_name() << ";";
    return render.str();
  }
  
  /**
   * Renders a function signature
   *
   * @param tfunction Function definition
   * @return String of rendered function definition
   */
  string t_cocoa_generator::function_signature(t_function* tfunction) {
    t_type* ttype = tfunction->get_returntype();
    std::string result =
      "(" + type_name(ttype) + ") " + tfunction->get_name() + argument_list(tfunction->get_arglist());
    return result;
  }
  
  
  /**
   * Renders a colon separated list of types and names, suitable for an
   * objective-c parameter list
   */
  string t_cocoa_generator::argument_list(t_struct* tstruct) {
    string result = "";
  
    const vector<t_field*>& fields = tstruct->get_members();
    vector<t_field*>::const_iterator f_iter;
    bool first = true;
    for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
      string argPrefix = "";
      if (first) {
        first = false;
      } else {
        argPrefix = (*f_iter)->get_name();
        result += " ";
      }
      result += argPrefix + ": (" + type_name((*f_iter)->get_type()) + ") " + (*f_iter)->get_name();
    }
    return result;
  }
  
  
  /**
   * Converts the parse type to an Objective-C enum string for the given type.
   */
  string t_cocoa_generator::type_to_enum(t_type* type) {
    type = get_true_type(type);
  
    if (type->is_base_type()) {
      t_base_type::t_base tbase = ((t_base_type*)type)->get_base();
      switch (tbase) {
        case t_base_type::TYPE_VOID:
          throw "NO T_VOID CONSTRUCT";
        case t_base_type::TYPE_STRING:
          return "TType_STRING";
        case t_base_type::TYPE_BOOL:
          return "TType_BOOL";
        case t_base_type::TYPE_BYTE:
          return "TType_BYTE";
        case t_base_type::TYPE_I16:
          return "TType_I16";
        case t_base_type::TYPE_I32:
          return "TType_I32";
        case t_base_type::TYPE_I64:
          return "TType_I64";
        case t_base_type::TYPE_DOUBLE:
          return "TType_DOUBLE";
        case t_base_type::TYPE_FLOAT:
          return "TType_FLOAT";
      }
    } else if (type->is_enum()) {
      return "TType_I32";
    } else if (type->is_struct() || type->is_xception()) {
      return "TType_STRUCT";
    } else if (type->is_map()) {
      return "TType_MAP";
    } else if (type->is_set()) {
      return "TType_SET";
    } else if (type->is_list()) {
      return "TType_LIST";
    }
  
    throw "INVALID TYPE IN type_to_enum: " + type->get_name();
  }
  
  
  /**
   * Returns a format string specifier for the supplied parse type.
   */
  string t_cocoa_generator::format_string_for_type(t_type* type) {
    type = get_true_type(type);
  
    if (type->is_base_type()) {
      t_base_type::t_base tbase = ((t_base_type*)type)->get_base();
      switch (tbase) {
        case t_base_type::TYPE_VOID:
          throw "NO T_VOID CONSTRUCT";
        case t_base_type::TYPE_STRING:
          return "\\\"%@\\\"";
        case t_base_type::TYPE_BOOL:
          return "%i";
        case t_base_type::TYPE_BYTE:
          return "%i";
        case t_base_type::TYPE_I16:
          return "%hi";
        case t_base_type::TYPE_I32:
          return "%i";
        case t_base_type::TYPE_I64:
          return "%qi";
        case t_base_type::TYPE_DOUBLE:
          return "%f";
        case t_base_type::TYPE_FLOAT:
          return "%f";
      }
    } else if (type->is_enum()) {
      return "%i";
    } else if (type->is_struct() || type->is_xception()) {
      return "%@";
    } else if (type->is_map()) {
      return "%@";
    } else if (type->is_set()) {
      return "%@";
    } else if (type->is_list()) {
      return "%@";
    }
  
    throw "INVALID TYPE IN format_string_for_type: " + type->get_name();
  }
  
  /**
   * Generate a call to a field's setter.
   *
   * @param tfield Field the setter is being called on
   * @param fieldName Name of variable to pass to setter
   */
  
  string t_cocoa_generator::call_field_setter(t_field* tfield, string fieldName) {
    return "[self set" + capitalize(tfield->get_name()) + ": " + fieldName + "];";
  }
  
  
  THRIFT_REGISTER_GENERATOR(cocoa, "Cocoa",
  "    import_path=XYZ: Override thrift package import path\n"
  "    log_unexpected:  Log every time an unexpected field ID or type is encountered.\n"
  "    nullability:     Use annotations to ensure required fields are present.\n"
  "    validate_required:\n"
  "                     Throws exception if any required field is not set.\n"
  )
  