third_party/WebKit/Source/modules/webdatabase/SQLStatement.cpp

/*
 * 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
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 */

#include "modules/webdatabase/SQLStatement.h"

#include "bindings/modules/v8/V8SQLStatementCallback.h"
#include "bindings/modules/v8/V8SQLStatementErrorCallback.h"
#include "core/probe/CoreProbes.h"
#include "modules/webdatabase/Database.h"
#include "modules/webdatabase/DatabaseManager.h"
#include "modules/webdatabase/SQLError.h"
#include "modules/webdatabase/SQLStatementBackend.h"
#include "modules/webdatabase/SQLTransaction.h"
#include "modules/webdatabase/sqlite/SQLiteDatabase.h"
#include "modules/webdatabase/sqlite/SQLiteStatement.h"
#include "platform/wtf/text/CString.h"

namespace blink {

void SQLStatement::OnSuccessV8Impl::Trace(blink::Visitor* visitor) {
  visitor->Trace(callback_);
  OnSuccessCallback::Trace(visitor);
}

bool SQLStatement::OnSuccessV8Impl::OnSuccess(SQLTransaction* transaction,
                                              SQLResultSet* result_set) {
  return callback_->handleEvent(transaction, result_set);
}

void SQLStatement::OnErrorV8Impl::Trace(blink::Visitor* visitor) {
  visitor->Trace(callback_);
  OnErrorCallback::Trace(visitor);
}

bool SQLStatement::OnErrorV8Impl::OnError(SQLTransaction* transaction,
                                          SQLError* error) {
  return callback_->handleEvent(transaction, error);
}

SQLStatement* SQLStatement::Create(Database* database,
                                   OnSuccessCallback* callback,
                                   OnErrorCallback* error_callback) {
  return new SQLStatement(database, callback, error_callback);
}

SQLStatement::SQLStatement(Database* database,
                           OnSuccessCallback* callback,
                           OnErrorCallback* error_callback)
    : success_callback_(callback), error_callback_(error_callback) {
  DCHECK(IsMainThread());

  if (HasCallback() || HasErrorCallback()) {
    probe::AsyncTaskScheduled(database->GetExecutionContext(), "SQLStatement",
                              this);
  }
}

void SQLStatement::Trace(blink::Visitor* visitor) {
  visitor->Trace(backend_);
  visitor->Trace(success_callback_);
  visitor->Trace(error_callback_);
}

void SQLStatement::SetBackend(SQLStatementBackend* backend) {
  backend_ = backend;
}

bool SQLStatement::HasCallback() {
  return success_callback_;
}

bool SQLStatement::HasErrorCallback() {
  return error_callback_;
}

bool SQLStatement::PerformCallback(SQLTransaction* transaction) {
  DCHECK(transaction);
  DCHECK(backend_);

  bool callback_error = false;

  OnSuccessCallback* callback = success_callback_.Release();
  OnErrorCallback* error_callback = error_callback_.Release();
  SQLErrorData* error = backend_->SqlError();

  probe::AsyncTask async_task(transaction->GetDatabase()->GetExecutionContext(),
                              this);

  // Call the appropriate statement callback and track if it resulted in an
  // error, because then we need to jump to the transaction error callback.
  if (error) {
    if (error_callback) {
      callback_error =
          error_callback->OnError(transaction, SQLError::Create(*error));
    }
  } else if (callback) {
    callback_error =
        !callback->OnSuccess(transaction, backend_->SqlResultSet());
  }

  return callback_error;
}

}  // namespace blink