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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 #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 #include "platform/heap/Handle.h"
     41 
     42 namespace WebCore {
     43 
     44 class DirectoryEntry;
     45 class File;
     46 class FileCallback;
     47 class FileEntry;
     48 class FileWriterCallback;
     49 
     50 class DOMFileSystem FINAL : public DOMFileSystemBase, public ScriptWrappable, public ActiveDOMObject {
     51 public:
     52     static DOMFileSystem* create(ExecutionContext*, const String& name, FileSystemType, const KURL& rootURL);
     53 
     54     // Creates a new isolated file system for the given filesystemId.
     55     static DOMFileSystem* createIsolatedFileSystem(ExecutionContext*, const String& filesystemId);
     56 
     57     DirectoryEntry* root();
     58 
     59     // DOMFileSystemBase overrides.
     60     virtual void addPendingCallbacks() OVERRIDE;
     61     virtual void removePendingCallbacks() OVERRIDE;
     62     virtual void reportError(PassOwnPtr<ErrorCallback>, PassRefPtrWillBeRawPtr<FileError>) OVERRIDE;
     63 
     64     // ActiveDOMObject overrides.
     65     virtual bool hasPendingActivity() const OVERRIDE;
     66 
     67     void createWriter(const FileEntry*, PassOwnPtr<FileWriterCallback>, PassOwnPtr<ErrorCallback>);
     68     void createFile(const FileEntry*, PassOwnPtr<FileCallback>, PassOwnPtr<ErrorCallback>);
     69 
     70     // Schedule a callback. This should not cross threads (should be called on the same context thread).
     71     // FIXME: move this to a more generic place.
     72     template <typename CB, typename CBArg>
     73     static void scheduleCallback(ExecutionContext*, PassOwnPtr<CB>, PassRefPtrWillBeRawPtr<CBArg>);
     74 
     75     template <typename CB, typename CBArg>
     76     static void scheduleCallback(ExecutionContext*, PassOwnPtr<CB>, CBArg*);
     77 
     78     template <typename CB, typename CBArg>
     79     static void scheduleCallback(ExecutionContext*, PassOwnPtr<CB>, const HeapVector<CBArg>&);
     80 
     81     template <typename CB, typename CBArg>
     82     static void scheduleCallback(ExecutionContext*, PassOwnPtr<CB>, const CBArg&);
     83 
     84     template <typename CB>
     85     static void scheduleCallback(ExecutionContext*, PassOwnPtr<CB>);
     86 
     87     template <typename CB, typename CBArg>
     88     void scheduleCallback(PassOwnPtr<CB> callback, PassRefPtrWillBeRawPtr<CBArg> callbackArg)
     89     {
     90         scheduleCallback(executionContext(), callback, callbackArg);
     91     }
     92 
     93     template <typename CB, typename CBArg>
     94     void scheduleCallback(PassOwnPtr<CB> callback, CBArg* callbackArg)
     95     {
     96         scheduleCallback(executionContext(), callback, callbackArg);
     97     }
     98 
     99     template <typename CB, typename CBArg>
    100     void scheduleCallback(PassOwnPtr<CB> callback, const CBArg& callbackArg)
    101     {
    102         scheduleCallback(executionContext(), callback, callbackArg);
    103     }
    104 
    105 private:
    106     DOMFileSystem(ExecutionContext*, const String& name, FileSystemType, const KURL& rootURL);
    107 
    108     // A helper template to schedule a callback task.
    109     template <typename CB, typename CBArg>
    110     class DispatchCallbackRefPtrArgTask FINAL : public ExecutionContextTask {
    111     public:
    112         DispatchCallbackRefPtrArgTask(PassOwnPtr<CB> callback, PassRefPtrWillBeRawPtr<CBArg> arg)
    113             : m_callback(callback)
    114             , m_callbackArg(arg)
    115         {
    116         }
    117 
    118         virtual void performTask(ExecutionContext*) OVERRIDE
    119         {
    120             m_callback->handleEvent(m_callbackArg.get());
    121         }
    122 
    123     private:
    124         OwnPtr<CB> m_callback;
    125         RefPtrWillBePersistent<CBArg> m_callbackArg;
    126     };
    127 
    128     template <typename CB, typename CBArg>
    129     class DispatchCallbackPtrArgTask FINAL : public ExecutionContextTask {
    130     public:
    131         DispatchCallbackPtrArgTask(PassOwnPtr<CB> callback, CBArg* arg)
    132             : m_callback(callback)
    133             , m_callbackArg(arg)
    134         {
    135         }
    136 
    137         virtual void performTask(ExecutionContext*) OVERRIDE
    138         {
    139             m_callback->handleEvent(m_callbackArg.get());
    140         }
    141 
    142     private:
    143         OwnPtr<CB> m_callback;
    144         Persistent<CBArg> m_callbackArg;
    145     };
    146 
    147     template <typename CB, typename CBArg>
    148     class DispatchCallbackNonPtrArgTask FINAL : public ExecutionContextTask {
    149     public:
    150         DispatchCallbackNonPtrArgTask(PassOwnPtr<CB> callback, const CBArg& arg)
    151             : m_callback(callback)
    152             , m_callbackArg(arg)
    153         {
    154         }
    155 
    156         virtual void performTask(ExecutionContext*) OVERRIDE
    157         {
    158             m_callback->handleEvent(m_callbackArg);
    159         }
    160 
    161     private:
    162         OwnPtr<CB> m_callback;
    163         CBArg m_callbackArg;
    164     };
    165 
    166     template <typename CB>
    167     class DispatchCallbackNoArgTask FINAL : public ExecutionContextTask {
    168     public:
    169         DispatchCallbackNoArgTask(PassOwnPtr<CB> callback)
    170             : m_callback(callback)
    171         {
    172         }
    173 
    174         virtual void performTask(ExecutionContext*) OVERRIDE
    175         {
    176             m_callback->handleEvent();
    177         }
    178 
    179     private:
    180         OwnPtr<CB> m_callback;
    181     };
    182 
    183     int m_numberOfPendingCallbacks;
    184 };
    185 
    186 template <typename CB, typename CBArg>
    187 void DOMFileSystem::scheduleCallback(ExecutionContext* executionContext, PassOwnPtr<CB> callback, PassRefPtrWillBeRawPtr<CBArg> arg)
    188 {
    189     ASSERT(executionContext->isContextThread());
    190     if (callback)
    191         executionContext->postTask(adoptPtr(new DispatchCallbackRefPtrArgTask<CB, CBArg>(callback, arg)));
    192 }
    193 
    194 template <typename CB, typename CBArg>
    195 void DOMFileSystem::scheduleCallback(ExecutionContext* executionContext, PassOwnPtr<CB> callback, CBArg* arg)
    196 {
    197     ASSERT(executionContext->isContextThread());
    198     if (callback)
    199         executionContext->postTask(adoptPtr(new DispatchCallbackPtrArgTask<CB, CBArg>(callback, arg)));
    200 }
    201 
    202 template <typename CB, typename CBArg>
    203 void DOMFileSystem::scheduleCallback(ExecutionContext* executionContext, PassOwnPtr<CB> callback, const HeapVector<CBArg>& arg)
    204 {
    205     ASSERT(executionContext->isContextThread());
    206     if (callback)
    207         executionContext->postTask(adoptPtr(new DispatchCallbackNonPtrArgTask<CB, PersistentHeapVector<CBArg> >(callback, arg)));
    208 }
    209 
    210 template <typename CB, typename CBArg>
    211 void DOMFileSystem::scheduleCallback(ExecutionContext* executionContext, PassOwnPtr<CB> callback, const CBArg& arg)
    212 {
    213     ASSERT(executionContext->isContextThread());
    214     if (callback)
    215         executionContext->postTask(adoptPtr(new DispatchCallbackNonPtrArgTask<CB, CBArg>(callback, arg)));
    216 }
    217 
    218 template <typename CB>
    219 void DOMFileSystem::scheduleCallback(ExecutionContext* executionContext, PassOwnPtr<CB> callback)
    220 {
    221     ASSERT(executionContext->isContextThread());
    222     if (callback)
    223         executionContext->postTask(adoptPtr(new DispatchCallbackNoArgTask<CB>(callback)));
    224 }
    225 
    226 } // namespace
    227 
    228 #endif // DOMFileSystem_h
    229