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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:
     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 
     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:
     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 
    100 template <typename CB, typename CBArg>
    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