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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 are
6  * met:
7  *
8  *     * Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  *     * Redistributions in binary form must reproduce the above
11  * copyright notice, this list of conditions and the following disclaimer
12  * in the documentation and/or other materials provided with the
13  * distribution.
14  *     * Neither the name of Google Inc. nor the names of its
15  * contributors may be used to endorse or promote products derived from
16  * this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 
31 #ifndef LocalFileSystem_h
32 #define LocalFileSystem_h
33 
34 #if ENABLE(FILE_SYSTEM)
35 
36 #include "AsyncFileSystem.h"
37 #include "PlatformString.h"
38 #include <wtf/PassRefPtr.h>
39 #include <wtf/RefCounted.h>
40 
41 namespace WebCore {
42 
43 class ErrorCallback;
44 class FileSystemCallback;
45 class ScriptExecutionContext;
46 
47 // Keeps per-process information and provides an entry point to open a file system.
48 class LocalFileSystem {
49     WTF_MAKE_NONCOPYABLE(LocalFileSystem);
50 public:
51     // Returns a per-process instance of LocalFileSystem.
52     // Note that LocalFileSystem::initializeLocalFileSystem must be called before
53     // calling this one.
54     static LocalFileSystem& localFileSystem();
55 
56     // Does not create the root path for file system, just reads it if available.
57     void readFileSystem(ScriptExecutionContext*, AsyncFileSystem::Type, PassOwnPtr<AsyncFileSystemCallbacks>, bool synchronous = false);
58 
59     void requestFileSystem(ScriptExecutionContext*, AsyncFileSystem::Type, long long size, PassOwnPtr<AsyncFileSystemCallbacks>, bool synchronous = false);
60 
61 #if !PLATFORM(CHROMIUM)
62     // This call is not thread-safe; must be called before any worker threads are created.
63     void initializeLocalFileSystem(const String&);
64 
65     String fileSystemBasePath() const;
66 #endif
67 
68 private:
LocalFileSystem(const String & basePath)69     LocalFileSystem(const String& basePath)
70         : m_basePath(basePath)
71     {
72     }
73 
74     static LocalFileSystem* s_instance;
75 
76     // An inner class that enforces thread-safe string access.
77     class SystemBasePath {
78     public:
SystemBasePath(const String & path)79         explicit SystemBasePath(const String& path) : m_value(path) { }
String()80         operator String() const
81         {
82             return m_value.threadsafeCopy();
83         }
84     private:
85         String m_value;
86     };
87 
88     SystemBasePath m_basePath;
89 };
90 
91 } // namespace
92 
93 #endif // ENABLE(FILE_SYSTEM)
94 
95 #endif // LocalFileSystem_h
96