text: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // http://code.google.com/p/protobuf/
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  // Author: kenton@google.com (Kenton Varda)
  //  Based on original Protocol Buffers design by
  //  Sanjay Ghemawat, Jeff Dean, and others.
  
  #include <map>
  #include <string>
  
  #include <protobuf/compiler/javanano/javanano_message_field.h>
  #include <protobuf/compiler/javanano/javanano_helpers.h>
  #include <protobuf/io/printer.h>
  #include <protobuf/wire_format.h>
  #include <protobuf/stubs/strutil.h>
  
  namespace google {
  namespace protobuf {
  namespace compiler {
  namespace javanano {
  
  using internal::WireFormat;
  using internal::WireFormatLite;
  
  namespace {
  
  // TODO(kenton):  Factor out a "SetCommonFieldVariables()" to get rid of
  //   repeat code between this and the other field types.
  void SetMessageVariables(const Params& params,
      const FieldDescriptor* descriptor, map<string, string>* variables) {
    (*variables)["name"] =
      RenameJavaKeywords(UnderscoresToCamelCase(descriptor));
    (*variables)["capitalized_name"] =
      RenameJavaKeywords(UnderscoresToCapitalizedCamelCase(descriptor));
    (*variables)["number"] = SimpleItoa(descriptor->number());
    (*variables)["type"] = ClassName(params, descriptor->message_type());
    (*variables)["group_or_message"] =
      (descriptor->type() == FieldDescriptor::TYPE_GROUP) ?
      "Group" : "Message";
    (*variables)["message_name"] = descriptor->containing_type()->name();
    //(*variables)["message_type"] = descriptor->message_type()->name();
    (*variables)["tag"] = SimpleItoa(WireFormat::MakeTag(descriptor));
  }
  
  }  // namespace
  
  // ===================================================================
  
  MessageFieldGenerator::
  MessageFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
    : FieldGenerator(params), descriptor_(descriptor) {
    SetMessageVariables(params, descriptor, &variables_);
  }
  
  MessageFieldGenerator::~MessageFieldGenerator() {}
  
  void MessageFieldGenerator::
  GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
    printer->Print(variables_,
      "public $type$ $name$;\n");
  }
  
  void MessageFieldGenerator::
  GenerateClearCode(io::Printer* printer) const {
    printer->Print(variables_,
      "$name$ = null;\n");
  }
  
  void MessageFieldGenerator::
  GenerateMergingCode(io::Printer* printer) const {
    printer->Print(variables_,
      "if (this.$name$ == null) {\n"
      "  this.$name$ = new $type$();\n"
      "}\n");
  
    if (descriptor_->type() == FieldDescriptor::TYPE_GROUP) {
      printer->Print(variables_,
        "input.readGroup(this.$name$, $number$);\n");
    } else {
      printer->Print(variables_,
        "input.readMessage(this.$name$);\n");
    }
  }
  
  void MessageFieldGenerator::
  GenerateSerializationCode(io::Printer* printer) const {
    printer->Print(variables_,
      "if (this.$name$ != null) {\n"
      "  output.write$group_or_message$($number$, this.$name$);\n"
      "}\n");
  }
  
  void MessageFieldGenerator::
  GenerateSerializedSizeCode(io::Printer* printer) const {
    printer->Print(variables_,
      "if (this.$name$ != null) {\n"
      "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
      "    .compute$group_or_message$Size($number$, this.$name$);\n"
      "}\n");
  }
  
  void MessageFieldGenerator::
  GenerateFixClonedCode(io::Printer* printer) const {
    printer->Print(variables_,
      "if (this.$name$ != null) {\n"
      "  cloned.$name$ = this.$name$.clone();\n"
      "}\n");
  }
  
  void MessageFieldGenerator::
  GenerateEqualsCode(io::Printer* printer) const {
    printer->Print(variables_,
      "if (this.$name$ == null) { \n"
      "  if (other.$name$ != null) {\n"
      "    return false;\n"
      "  }\n"
      "} else {\n"
      "  if (!this.$name$.equals(other.$name$)) {\n"
      "    return false;\n"
      "  }\n"
      "}\n");
  }
  
  void MessageFieldGenerator::
  GenerateHashCodeCode(io::Printer* printer) const {
    printer->Print(variables_,
      "result = 31 * result +\n"
      "    (this.$name$ == null ? 0 : this.$name$.hashCode());\n");
  }
  // ===================================================================
  
  MessageOneofFieldGenerator::MessageOneofFieldGenerator(
      const FieldDescriptor* descriptor, const Params& params)
      : FieldGenerator(params), descriptor_(descriptor) {
      SetMessageVariables(params, descriptor, &variables_);
      SetCommonOneofVariables(descriptor, &variables_);
  }
  
  MessageOneofFieldGenerator::~MessageOneofFieldGenerator() {}
  
  void MessageOneofFieldGenerator::
  GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
    printer->Print(variables_,
      "public boolean has$capitalized_name$() {\n"
      "  return $has_oneof_case$;\n"
      "}\n"
      "public $type$ get$capitalized_name$() {\n"
      "  if ($has_oneof_case$) {\n"
      "    return ($type$) this.$oneof_name$_;\n"
      "  }\n"
      "  return null;\n"
      "}\n"
      "public $message_name$ set$capitalized_name$($type$ value) {\n"
      "  if (value == null) { throw new java.lang.NullPointerException(); }\n"
      "  $set_oneof_case$;\n"
      "  this.$oneof_name$_ = value;\n"
      "  return this;\n"
      "}\n");
  }
  
  void MessageOneofFieldGenerator::
  GenerateClearCode(io::Printer* printer) const {
    // No clear method for oneof fields.
  }
  
  void MessageOneofFieldGenerator::
  GenerateMergingCode(io::Printer* printer) const {
    printer->Print(variables_,
      "if (!($has_oneof_case$)) {\n"
      "  this.$oneof_name$_ = new $type$();\n"
      "}\n"
      "input.readMessage(\n"
      "    (com.google.protobuf.nano.MessageNano) this.$oneof_name$_);\n"
      "$set_oneof_case$;\n");
  }
  
  void MessageOneofFieldGenerator::
  GenerateSerializationCode(io::Printer* printer) const {
    printer->Print(variables_,
      "if ($has_oneof_case$) {\n"
      "  output.writeMessage($number$,\n"
      "      (com.google.protobuf.nano.MessageNano) this.$oneof_name$_);\n"
      "}\n");
  }
  
  void MessageOneofFieldGenerator::
  GenerateSerializedSizeCode(io::Printer* printer) const {
    printer->Print(variables_,
      "if ($has_oneof_case$) {\n"
      "  size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
      "    .computeMessageSize($number$,\n"
      "        (com.google.protobuf.nano.MessageNano) this.$oneof_name$_);\n"
      "}\n");
  }
  
  void MessageOneofFieldGenerator::
  GenerateFixClonedCode(io::Printer* printer) const {
    printer->Print(variables_,
      "if (this.$oneof_name$ != null) {\n"
      "  cloned.$oneof_name$ = this.$oneof_name$.clone();\n"
      "}\n");
  }
  
  void MessageOneofFieldGenerator::
  GenerateEqualsCode(io::Printer* printer) const {
    GenerateOneofFieldEquals(descriptor_, variables_, printer);
  }
  
  void MessageOneofFieldGenerator::
  GenerateHashCodeCode(io::Printer* printer) const {
    GenerateOneofFieldHashCode(descriptor_, variables_, printer);
  }
  
  // ===================================================================
  
  RepeatedMessageFieldGenerator::RepeatedMessageFieldGenerator(
      const FieldDescriptor* descriptor, const Params& params)
      : FieldGenerator(params), descriptor_(descriptor) {
    SetMessageVariables(params, descriptor, &variables_);
  }
  
  RepeatedMessageFieldGenerator::~RepeatedMessageFieldGenerator() {}
  
  void RepeatedMessageFieldGenerator::
  GenerateMembers(io::Printer* printer, bool /* unused lazy_init */) const {
    printer->Print(variables_,
      "public $type$[] $name$;\n");
  }
  
  void RepeatedMessageFieldGenerator::
  GenerateClearCode(io::Printer* printer) const {
    printer->Print(variables_,
      "$name$ = $type$.emptyArray();\n");
  }
  
  void RepeatedMessageFieldGenerator::
  GenerateMergingCode(io::Printer* printer) const {
    // First, figure out the length of the array, then parse.
    printer->Print(variables_,
      "int arrayLength = com.google.protobuf.nano.WireFormatNano\n"
      "    .getRepeatedFieldArrayLength(input, $tag$);\n"
      "int i = this.$name$ == null ? 0 : this.$name$.length;\n"
      "$type$[] newArray =\n"
      "    new $type$[i + arrayLength];\n"
      "if (i != 0) {\n"
      "  java.lang.System.arraycopy(this.$name$, 0, newArray, 0, i);\n"
      "}\n"
      "for (; i < newArray.length - 1; i++) {\n"
      "  newArray[i] = new $type$();\n");
  
    if (descriptor_->type() == FieldDescriptor::TYPE_GROUP) {
      printer->Print(variables_,
        "  input.readGroup(newArray[i], $number$);\n");
    } else {
      printer->Print(variables_,
        "  input.readMessage(newArray[i]);\n");
    }
  
    printer->Print(variables_,
      "  input.readTag();\n"
      "}\n"
      "// Last one without readTag.\n"
      "newArray[i] = new $type$();\n");
  
    if (descriptor_->type() == FieldDescriptor::TYPE_GROUP) {
      printer->Print(variables_,
        "input.readGroup(newArray[i], $number$);\n");
    } else {
      printer->Print(variables_,
        "input.readMessage(newArray[i]);\n");
    }
  
    printer->Print(variables_,
      "this.$name$ = newArray;\n");
  }
  
  void RepeatedMessageFieldGenerator::
  GenerateSerializationCode(io::Printer* printer) const {
    printer->Print(variables_,
      "if (this.$name$ != null && this.$name$.length > 0) {\n"
      "  for (int i = 0; i < this.$name$.length; i++) {\n"
      "    $type$ element = this.$name$[i];\n"
      "    if (element != null) {\n"
      "      output.write$group_or_message$($number$, element);\n"
      "    }\n"
      "  }\n"
      "}\n");
  }
  
  void RepeatedMessageFieldGenerator::
  GenerateSerializedSizeCode(io::Printer* printer) const {
    printer->Print(variables_,
      "if (this.$name$ != null && this.$name$.length > 0) {\n"
      "  for (int i = 0; i < this.$name$.length; i++) {\n"
      "    $type$ element = this.$name$[i];\n"
      "    if (element != null) {\n"
      "      size += com.google.protobuf.nano.CodedOutputByteBufferNano\n"
      "        .compute$group_or_message$Size($number$, element);\n"
      "    }\n"
      "  }\n"
      "}\n");
  }
  
  void RepeatedMessageFieldGenerator::
  GenerateFixClonedCode(io::Printer* printer) const {
    printer->Print(variables_,
      "if (this.$name$ != null && this.$name$.length > 0) {\n"
      "  cloned.$name$ = new $type$[this.$name$.length];\n"
      "  for (int i = 0; i < this.$name$.length; i++) {\n"
      "    if (this.$name$[i] != null) {\n"
      "      cloned.$name$[i] = this.$name$[i].clone();\n"
      "    }\n"
      "  }\n"
      "}\n");
  }
  
  void RepeatedMessageFieldGenerator::
  GenerateEqualsCode(io::Printer* printer) const {
    printer->Print(variables_,
      "if (!com.google.protobuf.nano.InternalNano.equals(\n"
      "    this.$name$, other.$name$)) {\n"
      "  return false;\n"
      "}\n");
  }
  
  void RepeatedMessageFieldGenerator::
  GenerateHashCodeCode(io::Printer* printer) const {
    printer->Print(variables_,
      "result = 31 * result\n"
      "    + com.google.protobuf.nano.InternalNano.hashCode(this.$name$);\n");
  }
  
  }  // namespace javanano
  }  // namespace compiler
  }  // namespace protobuf
  }  // namespace google
  