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 "DOMFileSystemBase.h"
37#include "FileSystemType.h"
38#include <wtf/PassRefPtr.h>
39#include <wtf/RefCounted.h>
40#include <wtf/text/WTFString.h>
41
42namespace WebCore {
43
44class ErrorCallback;
45class FileSystemCallback;
46class ScriptExecutionContext;
47
48// Keeps per-process information and provides an entry point to open a file system.
49class LocalFileSystem {
50    WTF_MAKE_NONCOPYABLE(LocalFileSystem);
51public:
52    // Returns a per-process instance of LocalFileSystem.
53    // Note that LocalFileSystem::initializeLocalFileSystem must be called before
54    // calling this one.
55    static LocalFileSystem& localFileSystem();
56
57    // Does not create the root path for file system, just reads it if available.
58    void readFileSystem(ScriptExecutionContext*, FileSystemType, PassOwnPtr<AsyncFileSystemCallbacks>, FileSystemSynchronousType = AsynchronousFileSystem);
59
60    void requestFileSystem(ScriptExecutionContext*, FileSystemType, long long size, PassOwnPtr<AsyncFileSystemCallbacks>, FileSystemSynchronousType = AsynchronousFileSystem);
61
62    void deleteFileSystem(ScriptExecutionContext*, FileSystemType, PassOwnPtr<AsyncFileSystemCallbacks>);
63
64    // This call is not thread-safe; must be called before any worker threads are created.
65    static void initializeLocalFileSystem(const String&);
66
67    String fileSystemBasePath() const;
68
69private:
70    explicit LocalFileSystem(const String& basePath)
71        : m_basePath(basePath)
72    {
73    }
74
75    static LocalFileSystem* s_instance;
76
77    // An inner class that enforces thread-safe string access.
78    class SystemBasePath {
79    public:
80        explicit SystemBasePath(const String& path) : m_value(path) { }
81        operator String() const
82        {
83            return m_value.isolatedCopy();
84        }
85    private:
86        String m_value;
87    };
88
89    SystemBasePath m_basePath;
90};
91
92} // namespace
93
94#endif // ENABLE(FILE_SYSTEM)
95
96#endif // LocalFileSystem_h
97