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
36namespace WebCore {
37
38ChangeVersionWrapper::ChangeVersionWrapper(const String& oldVersion, const String& newVersion)
39    : m_oldVersion(oldVersion.isolatedCopy())
40    , m_newVersion(newVersion.isolatedCopy())
41{
42}
43
44bool 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 = SQLErrorData::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 = SQLErrorData::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
68bool 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 = SQLErrorData::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
88void ChangeVersionWrapper::handleCommitFailedAfterPostflight(SQLTransactionBackend* transaction)
89{
90    transaction->database()->setCachedVersion(m_oldVersion);
91}
92
93} // namespace WebCore
94