Home | History | Annotate | Download | only in filesystem 
      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 #include "bindings/v8/ScriptWrappable.h"
     35 #include "core/dom/ActiveDOMObject.h"
     36 #include "core/dom/ExecutionContext.h"
     37 #include "core/dom/ExecutionContextTask.h"
     38 #include "modules/filesystem/DOMFileSystemBase.h"
     39 #include "modules/filesystem/EntriesCallback.h"
     40 
     41 namespace WebCore {
     42 
     43 class DirectoryEntry;
     44 class File;
     45 class FileCallback;
     46 class FileEntry;
     47 class FileWriterCallback;
     48 
     49 class DOMFileSystem : public DOMFileSystemBase, public ScriptWrappable, public ActiveDOMObject {
     50 public:
     51     static PassRefPtr<DOMFileSystem> create(ExecutionContext*, const String& name, FileSystemType, const KURL& rootURL);
     52 
     53     // Creates a new isolated file system for the given filesystemId.
     54     static PassRefPtr<DOMFileSystem> createIsolatedFileSystem(ExecutionContext*, const String& filesystemId);
     55 
     56     PassRefPtr<DirectoryEntry> root();
     57 
     58     // DOMFileSystemBase overrides.
     59     virtual void addPendingCallbacks() OVERRIDE;
     60     virtual void removePendingCallbacks() OVERRIDE;
     61     virtual void reportError(PassOwnPtr<ErrorCallback>, PassRefPtr<FileError>) OVERRIDE;
     62 
     63     void createWriter(const FileEntry*, PassOwnPtr<FileWriterCallback>, PassOwnPtr<ErrorCallback>);
     64     void createFile(const FileEntry*, PassOwnPtr<FileCallback>, PassOwnPtr<ErrorCallback>);
     65 
     66     // Schedule a callback. This should not cross threads (should be called on the same context thread).
     67     // FIXME: move this to a more generic place.
     68     template <typename CB, typename CBArg>
     69     static void scheduleCallback(ExecutionContext*, PassOwnPtr<CB>, PassRefPtr<CBArg>);
     70 
     71     template <typename CB, typename CBArg>
     72     static void scheduleCallback(ExecutionContext*, PassOwnPtr<CB>, const CBArg&);
     73 
     74     template <typename CB, typename CBArg>
     75     void scheduleCallback(PassOwnPtr<CB> callback, PassRefPtr<CBArg> callbackArg)
     76     {
     77         scheduleCallback(executionContext(), callback, callbackArg);
     78     }
     79 
     80     template <typename CB, typename CBArg>
     81     void scheduleCallback(PassOwnPtr<CB> callback,  const CBArg& callbackArg)
     82     {
     83         scheduleCallback(executionContext(), callback, callbackArg);
     84     }
     85 
     86 private:
     87     DOMFileSystem(ExecutionContext*, const String& name, FileSystemType, const KURL& rootURL);
     88 
     89     // A helper template to schedule a callback task.
     90     template <typename CB, typename CBArg>
     91     class DispatchCallbacRefPtrArgTask : public ExecutionContextTask {
     92     public:
     93         DispatchCallbacRefPtrArgTask(PassOwnPtr<CB> callback, PassRefPtr<CBArg> arg)
     94             : m_callback(callback)
     95             , m_callbackArg(arg)
     96         {
     97         }
     98 
     99         virtual void performTask(ExecutionContext*)
    100         {
    101             m_callback->handleEvent(m_callbackArg.get());
    102         }
    103 
    104     private:
    105         OwnPtr<CB> m_callback;
    106         RefPtr<CBArg> m_callbackArg;
    107     };
    108 
    109     template <typename CB, typename CBArg>
    110     class DispatchCallbackNonPtrArgTask : public ExecutionContextTask {
    111     public:
    112         DispatchCallbackNonPtrArgTask(PassOwnPtr<CB> callback, const CBArg& arg)
    113             : m_callback(callback)
    114             , m_callbackArg(arg)
    115         {
    116         }
    117 
    118         virtual void performTask(ExecutionContext*)
    119         {
    120             m_callback->handleEvent(m_callbackArg);
    121         }
    122 
    123     private:
    124         OwnPtr<CB> m_callback;
    125         CBArg m_callbackArg;
    126     };
    127 };
    128 
    129 template <typename CB, typename CBArg>
    130 void DOMFileSystem::scheduleCallback(ExecutionContext* executionContext, PassOwnPtr<CB> callback, PassRefPtr<CBArg> arg)
    131 {
    132     ASSERT(executionContext->isContextThread());
    133     if (callback)
    134         executionContext->postTask(adoptPtr(new DispatchCallbacRefPtrArgTask<CB, CBArg>(callback, arg)));
    135 }
    136 
    137 template <typename CB, typename CBArg>
    138 void DOMFileSystem::scheduleCallback(ExecutionContext* executionContext, PassOwnPtr<CB> callback, const CBArg& arg)
    139 {
    140     ASSERT(executionContext->isContextThread());
    141     if (callback)
    142         executionContext->postTask(adoptPtr(new DispatchCallbackNonPtrArgTask<CB, CBArg>(callback, arg)));
    143 }
    144 
    145 } // namespace
    146 
    147 #endif // DOMFileSystem_h
    148