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 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.
   */
  #include "config.h"
  #include "ChangeVersionWrapper.h"
  
  #include "Database.h"
  #include "SQLError.h"
  #include "SQLTransactionBackend.h"
  #include <wtf/RefPtr.h>
  
  namespace WebCore {
  
  ChangeVersionWrapper::ChangeVersionWrapper(const String& oldVersion, const String& newVersion)
      : m_oldVersion(oldVersion.isolatedCopy())
      , m_newVersion(newVersion.isolatedCopy())
  {
  }
  
  bool ChangeVersionWrapper::performPreflight(SQLTransaction& transaction)
  {
      Database& database = transaction.database();
  
      String actualVersion;
      if (!database.getVersionFromDatabase(actualVersion)) {
          int sqliteError = database.sqliteDatabase().lastError();
          m_sqlError = SQLError::create(SQLError::UNKNOWN_ERR, "unable to read the current version", sqliteError, database.sqliteDatabase().lastErrorMsg());
          return false;
      }
  
      if (actualVersion != m_oldVersion) {
          m_sqlError = SQLError::create(SQLError::VERSION_ERR, "current version of the database and `oldVersion` argument do not match");
          return false;
      }
  
      return true;
  }
  
  bool ChangeVersionWrapper::performPostflight(SQLTransaction& transaction)
  {
      Database& database = transaction.database();
  
      if (!database.setVersionInDatabase(m_newVersion)) {
          int sqliteError = database.sqliteDatabase().lastError();
          m_sqlError = SQLError::create(SQLError::UNKNOWN_ERR, "unable to set new version in database", sqliteError, database.sqliteDatabase().lastErrorMsg());
          return false;
      }
  
      database.setExpectedVersion(m_newVersion);
      return true;
  }
  
  void ChangeVersionWrapper::handleCommitFailedAfterPostflight(SQLTransaction& transaction)
  {
      transaction.database().setCachedVersion(m_oldVersion);
  }
  
  } // namespace WebCore
  