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 DOMFileSystem_h
32#define DOMFileSystem_h
33
34#if ENABLE(FILE_SYSTEM)
35
36#include "ActiveDOMObject.h"
37#include "DOMFileSystemBase.h"
38#include "ScriptExecutionContext.h"
39
40namespace WebCore {
41
42class DirectoryEntry;
43class File;
44class FileCallback;
45class FileEntry;
46class FileWriterCallback;
47
48class DOMFileSystem : public DOMFileSystemBase, public ActiveDOMObject {
49public:
50    static PassRefPtr<DOMFileSystem> create(ScriptExecutionContext* context, const String& name, PassOwnPtr<AsyncFileSystem> asyncFileSystem)
51    {
52        return adoptRef(new DOMFileSystem(context, name, asyncFileSystem));
53    }
54
55    PassRefPtr<DirectoryEntry> root();
56
57    // ActiveDOMObject methods.
58    virtual void stop();
59    virtual bool hasPendingActivity() const;
60    virtual void contextDestroyed();
61
62    void createWriter(const FileEntry*, PassRefPtr<FileWriterCallback>, PassRefPtr<ErrorCallback>);
63    void createFile(const FileEntry*, PassRefPtr<FileCallback>, PassRefPtr<ErrorCallback>);
64
65    // Schedule a callback. This should not cross threads (should be called on the same context thread).
66    // FIXME: move this to a more generic place.
67    template <typename CB, typename CBArg>
68    static void scheduleCallback(ScriptExecutionContext*, PassRefPtr<CB>, PassRefPtr<CBArg>);
69
70    template <typename CB, typename CBArg>
71    void scheduleCallback(PassRefPtr<CB> callback, PassRefPtr<CBArg> callbackArg)
72    {
73        scheduleCallback(scriptExecutionContext(), callback, callbackArg);
74    }
75
76private:
77    DOMFileSystem(ScriptExecutionContext*, const String& name, PassOwnPtr<AsyncFileSystem>);
78
79    // A helper template to schedule a callback task.
80    template <typename CB, typename CBArg>
81    class DispatchCallbackTask : public ScriptExecutionContext::Task {
82    public:
83        DispatchCallbackTask(PassRefPtr<CB> callback, PassRefPtr<CBArg> arg)
84            : m_callback(callback)
85            , m_callbackArg(arg)
86        {
87        }
88
89        virtual void performTask(ScriptExecutionContext*)
90        {
91            m_callback->handleEvent(m_callbackArg.get());
92        }
93
94    private:
95        RefPtr<CB> m_callback;
96        RefPtr<CBArg> m_callbackArg;
97    };
98};
99
100template <typename CB, typename CBArg>
101void DOMFileSystem::scheduleCallback(ScriptExecutionContext* scriptExecutionContext, PassRefPtr<CB> callback, PassRefPtr<CBArg> arg)
102{
103    ASSERT(scriptExecutionContext->isContextThread());
104    ASSERT(callback);
105    scriptExecutionContext->postTask(new DispatchCallbackTask<CB, CBArg>(callback, arg));
106}
107
108} // namespace
109
110#endif // ENABLE(FILE_SYSTEM)
111
112#endif // DOMFileSystem_h
113