third_party/WebKit/Source/modules/webdatabase/SQLTransaction.h

/*
 * 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
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 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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 */

#ifndef SQLTransaction_h
#define SQLTransaction_h

#include <memory>
#include "bindings/modules/v8/V8BindingForModules.h"
#include "modules/webdatabase/SQLStatement.h"
#include "modules/webdatabase/SQLTransactionStateMachine.h"
#include "platform/bindings/ScriptWrappable.h"
#include "platform/heap/Handle.h"
#include "platform/wtf/Optional.h"

namespace blink {

class Database;
class ExceptionState;
class SQLErrorData;
class SQLTransactionBackend;
class SQLValue;
class ScriptValue;
class V8SQLTransactionCallback;
class V8SQLTransactionErrorCallback;
class V8VoidCallback;

class SQLTransaction final : public ScriptWrappable,
                             public SQLTransactionStateMachine<SQLTransaction> {
  DEFINE_WRAPPERTYPEINFO();

 public:
  class OnProcessCallback
      : public GarbageCollectedFinalized<OnProcessCallback> {
   public:
    virtual ~OnProcessCallback() = default;
    virtual void Trace(blink::Visitor*) {}
    virtual bool OnProcess(SQLTransaction*) = 0;

   protected:
    OnProcessCallback() = default;
  };

  class OnProcessV8Impl : public OnProcessCallback {
   public:
    static OnProcessV8Impl* Create(V8SQLTransactionCallback* callback) {
      return callback ? new OnProcessV8Impl(callback) : nullptr;
    }
    void Trace(blink::Visitor*) override;
    bool OnProcess(SQLTransaction*) override;

   private:
    explicit OnProcessV8Impl(V8SQLTransactionCallback* callback)
        : callback_(callback) {}

    Member<V8SQLTransactionCallback> callback_;
  };

  class OnSuccessCallback
      : public GarbageCollectedFinalized<OnSuccessCallback> {
   public:
    virtual ~OnSuccessCallback() = default;
    virtual void Trace(blink::Visitor*) {}
    virtual void OnSuccess() = 0;

   protected:
    OnSuccessCallback() = default;
  };

  class OnSuccessV8Impl : public OnSuccessCallback {
   public:
    static OnSuccessV8Impl* Create(V8VoidCallback* callback) {
      return callback ? new OnSuccessV8Impl(callback) : nullptr;
    }
    void Trace(blink::Visitor*) override;
    void OnSuccess() override;

   private:
    explicit OnSuccessV8Impl(V8VoidCallback* callback) : callback_(callback) {}

    Member<V8VoidCallback> callback_;
  };

  class OnErrorCallback : public GarbageCollectedFinalized<OnErrorCallback> {
   public:
    virtual ~OnErrorCallback() = default;
    virtual void Trace(blink::Visitor*) {}
    virtual bool OnError(SQLError*) = 0;

   protected:
    OnErrorCallback() = default;
  };

  class OnErrorV8Impl : public OnErrorCallback {
   public:
    static OnErrorV8Impl* Create(V8SQLTransactionErrorCallback* callback) {
      return callback ? new OnErrorV8Impl(callback) : nullptr;
    }
    void Trace(blink::Visitor*) override;
    bool OnError(SQLError*) override;

   private:
    explicit OnErrorV8Impl(V8SQLTransactionErrorCallback* callback)
        : callback_(callback) {}

    Member<V8SQLTransactionErrorCallback> callback_;
  };

  static SQLTransaction* Create(Database*,
                                OnProcessCallback*,
                                OnSuccessCallback*,
                                OnErrorCallback*,
                                bool read_only);
  ~SQLTransaction();
  void Trace(blink::Visitor*);

  void PerformPendingCallback();

  void ExecuteSQL(const String& sql_statement,
                  const Vector<SQLValue>& arguments,
                  SQLStatement::OnSuccessCallback*,
                  SQLStatement::OnErrorCallback*,
                  ExceptionState&);
  void executeSql(ScriptState*, const String& sql_statement, ExceptionState&);
  void executeSql(ScriptState*,
                  const String& sql_statement,
                  const Optional<Vector<ScriptValue>>& arguments,
                  V8SQLStatementCallback*,
                  V8SQLStatementErrorCallback*,
                  ExceptionState&);

  Database* GetDatabase() { return database_.Get(); }

  OnErrorCallback* ReleaseErrorCallback();

  // APIs called from the backend published:
  void RequestTransitToState(SQLTransactionState);
  bool HasCallback() const;
  bool HasSuccessCallback() const;
  bool HasErrorCallback() const;
  void SetBackend(SQLTransactionBackend*);

 private:
  SQLTransaction(Database*,
                 OnProcessCallback*,
                 OnSuccessCallback*,
                 OnErrorCallback*,
                 bool read_only);

  void ClearCallbacks();

  // State Machine functions:
  StateFunction StateFunctionFor(SQLTransactionState) override;
  bool ComputeNextStateAndCleanupIfNeeded();

  // State functions:
  SQLTransactionState DeliverTransactionCallback();
  SQLTransactionState DeliverTransactionErrorCallback();
  SQLTransactionState DeliverStatementCallback();
  SQLTransactionState DeliverQuotaIncreaseCallback();
  SQLTransactionState DeliverSuccessCallback();

  SQLTransactionState UnreachableState();
  SQLTransactionState SendToBackendState();

  SQLTransactionState NextStateForTransactionError();

  Member<Database> database_;
  Member<SQLTransactionBackend> backend_;
  Member<OnProcessCallback> callback_;
  Member<OnSuccessCallback> success_callback_;
  Member<OnErrorCallback> error_callback_;

  bool execute_sql_allowed_;
  std::unique_ptr<SQLErrorData> transaction_error_;

  bool read_only_;
};

}  // namespace blink

#endif  // SQLTransaction_h