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1 /*
2  * Copyright (C) 2010 Google 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 
29 #ifndef AbstractDatabase_h
30 #define AbstractDatabase_h
31 
32 #if ENABLE(DATABASE)
33 
34 #include "ExceptionCode.h"
35 #include "PlatformString.h"
36 #include "SQLiteDatabase.h"
37 #include <wtf/Forward.h>
38 #include <wtf/ThreadSafeRefCounted.h>
39 #ifndef NDEBUG
40 #include "SecurityOrigin.h"
41 #endif
42 
43 namespace WebCore {
44 
45 class DatabaseAuthorizer;
46 class ScriptExecutionContext;
47 class SecurityOrigin;
48 
49 class AbstractDatabase : public ThreadSafeRefCounted<AbstractDatabase> {
50 public:
51     static bool isAvailable();
52     static void setIsAvailable(bool available);
53 
54     virtual ~AbstractDatabase();
55 
56     virtual String version() const;
57 
opened()58     bool opened() const { return m_opened; }
isNew()59     bool isNew() const { return m_new; }
60 
61     virtual ScriptExecutionContext* scriptExecutionContext() const;
62     virtual SecurityOrigin* securityOrigin() const;
63     virtual String stringIdentifier() const;
64     virtual String displayName() const;
65     virtual unsigned long estimatedSize() const;
66     virtual String fileName() const;
sqliteDatabase()67     SQLiteDatabase& sqliteDatabase() { return m_sqliteDatabase; }
68 
69     unsigned long long maximumSize() const;
70     void incrementalVacuumIfNeeded();
71     void interrupt();
72     bool isInterrupted();
73 
74     // FIXME: move all version-related methods to a DatabaseVersionTracker class
75     bool versionMatchesExpected() const;
76     void setExpectedVersion(const String& version);
77     bool getVersionFromDatabase(String& version);
78     bool setVersionInDatabase(const String& version);
79 
80     void disableAuthorizer();
81     void enableAuthorizer();
82     void setAuthorizerReadOnly();
83     void setAuthorizerPermissions(int permissions);
84     bool lastActionChangedDatabase();
85     bool lastActionWasInsert();
86     void resetDeletes();
87     bool hadDeletes();
88     void resetAuthorizer();
89 
90     virtual void markAsDeletedAndClose() = 0;
91     virtual void closeImmediately() = 0;
92 
93 protected:
94     AbstractDatabase(ScriptExecutionContext*, const String& name, const String& expectedVersion,
95                      const String& displayName, unsigned long estimatedSize);
96 
97     void closeDatabase();
98 
99     virtual bool performOpenAndVerify(bool shouldSetVersionInNewDatabase, ExceptionCode& ec);
100 
101     static const String& databaseInfoTableName();
102 
103     RefPtr<ScriptExecutionContext> m_scriptExecutionContext;
104     RefPtr<SecurityOrigin> m_contextThreadSecurityOrigin;
105 
106     String m_name;
107     String m_expectedVersion;
108     String m_displayName;
109     unsigned long m_estimatedSize;
110     String m_filename;
111 
112 #ifndef NDEBUG
databaseDebugName()113     String databaseDebugName() const { return m_contextThreadSecurityOrigin->toString() + "::" + m_name; }
114 #endif
115 
116 private:
117     static const String& databaseVersionKey();
118 
119     int m_guid;
120     bool m_opened;
121     bool m_new;
122 
123     SQLiteDatabase m_sqliteDatabase;
124 
125     RefPtr<DatabaseAuthorizer> m_databaseAuthorizer;
126 };
127 
128 } // namespace WebCore
129 
130 #endif // ENABLE(DATABASE)
131 
132 #endif // AbstractDatabase_h
133