text: /*
   * Copyright (C) 2007, 2013 Apple Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1.  Redistributions of source code must retain the above copyright
   *     notice, this list of conditions and the following disclaimer.
   * 2.  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.
   * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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.
   */
  #ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBDATABASE_SQL_STATEMENT_H_
  #define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBDATABASE_SQL_STATEMENT_H_
  
  #include "third_party/blink/renderer/bindings/modules/v8/v8_sql_statement_callback.h"
  #include "third_party/blink/renderer/bindings/modules/v8/v8_sql_statement_error_callback.h"
  #include "third_party/blink/renderer/modules/webdatabase/sql_result_set.h"
  #include "third_party/blink/renderer/modules/webdatabase/sqlite/sql_value.h"
  #include "third_party/blink/renderer/platform/wtf/forward.h"
  #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
  
  namespace blink {
  
  class Database;
  class SQLError;
  class SQLStatementBackend;
  class SQLTransaction;
  
  class SQLStatement final : public GarbageCollected<SQLStatement> {
   public:
    class OnSuccessCallback
        : public GarbageCollectedFinalized<OnSuccessCallback> {
     public:
      virtual ~OnSuccessCallback() = default;
      virtual void Trace(blink::Visitor*) {}
      virtual bool OnSuccess(SQLTransaction*, SQLResultSet*) = 0;
  
     protected:
      OnSuccessCallback() = default;
    };
  
    class OnSuccessV8Impl : public OnSuccessCallback {
     public:
      static OnSuccessV8Impl* Create(V8SQLStatementCallback* callback) {
        return callback ? new OnSuccessV8Impl(callback) : nullptr;
      }
      void Trace(blink::Visitor*) override;
      bool OnSuccess(SQLTransaction*, SQLResultSet*) override;
  
     private:
      explicit OnSuccessV8Impl(V8SQLStatementCallback* callback)
          : callback_(ToV8PersistentCallbackInterface(callback)) {}
  
      Member<V8PersistentCallbackInterface<V8SQLStatementCallback>> callback_;
    };
  
    class OnErrorCallback : public GarbageCollectedFinalized<OnErrorCallback> {
     public:
      virtual ~OnErrorCallback() = default;
      virtual void Trace(blink::Visitor*) {}
      virtual bool OnError(SQLTransaction*, SQLError*) = 0;
  
     protected:
      OnErrorCallback() = default;
    };
  
    class OnErrorV8Impl : public OnErrorCallback {
     public:
      static OnErrorV8Impl* Create(V8SQLStatementErrorCallback* callback) {
        return callback ? new OnErrorV8Impl(callback) : nullptr;
      }
      void Trace(blink::Visitor*) override;
      bool OnError(SQLTransaction*, SQLError*) override;
  
     private:
      explicit OnErrorV8Impl(V8SQLStatementErrorCallback* callback)
          : callback_(ToV8PersistentCallbackInterface(callback)) {}
  
      Member<V8PersistentCallbackInterface<V8SQLStatementErrorCallback>>
          callback_;
    };
  
    static SQLStatement* Create(Database*, OnSuccessCallback*, OnErrorCallback*);
    void Trace(blink::Visitor*);
  
    bool PerformCallback(SQLTransaction*);
  
    void SetBackend(SQLStatementBackend*);
  
    bool HasCallback();
    bool HasErrorCallback();
  
   private:
    SQLStatement(Database*, OnSuccessCallback*, OnErrorCallback*);
  
    // The SQLStatementBackend owns the SQLStatement. Hence, the backend is
    // guaranteed to be outlive the SQLStatement, and it is safe for us to refer
    // to the backend using a raw pointer here.
    Member<SQLStatementBackend> backend_;
  
    Member<OnSuccessCallback> success_callback_;
    Member<OnErrorCallback> error_callback_;
  };
  
  }  // namespace blink
  
  #endif  // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBDATABASE_SQL_STATEMENT_H_
  