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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 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 
40 namespace WebCore {
41 
42 class DirectoryEntry;
43 class File;
44 class FileCallback;
45 class FileEntry;
46 class FileWriterCallback;
47 
48 class DOMFileSystem : public DOMFileSystemBase, public ActiveDOMObject {
49 public:
create(ScriptExecutionContext * context,const String & name,PassOwnPtr<AsyncFileSystem> asyncFileSystem)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>
scheduleCallback(PassRefPtr<CB> callback,PassRefPtr<CBArg> callbackArg)71     void scheduleCallback(PassRefPtr<CB> callback, PassRefPtr<CBArg> callbackArg)
72     {
73         scheduleCallback(scriptExecutionContext(), callback, callbackArg);
74     }
75 
76 private:
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:
DispatchCallbackTask(PassRefPtr<CB> callback,PassRefPtr<CBArg> arg)83         DispatchCallbackTask(PassRefPtr<CB> callback, PassRefPtr<CBArg> arg)
84             : m_callback(callback)
85             , m_callbackArg(arg)
86         {
87         }
88 
performTask(ScriptExecutionContext *)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 
100 template <typename CB, typename CBArg>
scheduleCallback(ScriptExecutionContext * scriptExecutionContext,PassRefPtr<CB> callback,PassRefPtr<CBArg> arg)101 void 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