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      1 /*
      2  * Copyright (C) 2007, 2013 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
     14  *     its contributors may be used to endorse or promote products derived
     15  *     from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 #include "config.h"
     29 #include "modules/webdatabase/ChangeVersionWrapper.h"
     30 
     31 #include "modules/webdatabase/Database.h"
     32 #include "modules/webdatabase/SQLError.h"
     33 #include "wtf/PassRefPtr.h"
     34 #include "wtf/RefPtr.h"
     35 
     36 namespace WebCore {
     37 
     38 ChangeVersionWrapper::ChangeVersionWrapper(const String& oldVersion, const String& newVersion)
     39     : m_oldVersion(oldVersion.isolatedCopy())
     40     , m_newVersion(newVersion.isolatedCopy())
     41 {
     42 }
     43 
     44 bool ChangeVersionWrapper::performPreflight(SQLTransactionBackend* transaction)
     45 {
     46     ASSERT(transaction && transaction->database());
     47 
     48     DatabaseBackend* database = transaction->database();
     49 
     50     String actualVersion;
     51     if (!database->getVersionFromDatabase(actualVersion)) {
     52         int sqliteError = database->sqliteDatabase().lastError();
     53         database->reportChangeVersionResult(1, SQLError::UNKNOWN_ERR, sqliteError);
     54         m_sqlError = SQLError::create(SQLError::UNKNOWN_ERR, "unable to read the current version",
     55                                       sqliteError, database->sqliteDatabase().lastErrorMsg());
     56         return false;
     57     }
     58 
     59     if (actualVersion != m_oldVersion) {
     60         database->reportChangeVersionResult(2, SQLError::VERSION_ERR, 0);
     61         m_sqlError = SQLError::create(SQLError::VERSION_ERR, "current version of the database and `oldVersion` argument do not match");
     62         return false;
     63     }
     64 
     65     return true;
     66 }
     67 
     68 bool ChangeVersionWrapper::performPostflight(SQLTransactionBackend* transaction)
     69 {
     70     ASSERT(transaction && transaction->database());
     71 
     72     DatabaseBackend* database = transaction->database();
     73 
     74     if (!database->setVersionInDatabase(m_newVersion)) {
     75         int sqliteError = database->sqliteDatabase().lastError();
     76         database->reportChangeVersionResult(3, SQLError::UNKNOWN_ERR, sqliteError);
     77         m_sqlError = SQLError::create(SQLError::UNKNOWN_ERR, "unable to set new version in database",
     78                                       sqliteError, database->sqliteDatabase().lastErrorMsg());
     79         return false;
     80     }
     81 
     82     database->setExpectedVersion(m_newVersion);
     83 
     84     database->reportChangeVersionResult(0, -1, 0); // OK
     85     return true;
     86 }
     87 
     88 void ChangeVersionWrapper::handleCommitFailedAfterPostflight(SQLTransactionBackend* transaction)
     89 {
     90     transaction->database()->setCachedVersion(m_oldVersion);
     91 }
     92 
     93 } // namespace WebCore
     94