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      1 /*
      2  * Copyright (C) 2010 Google Inc. All rights reserved.
      3  * Copyright (C) 2013 Samsung Electronics. All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are
      7  * met:
      8  *
      9  *     * Redistributions of source code must retain the above copyright
     10  * notice, this list of conditions and the following disclaimer.
     11  *     * Redistributions in binary form must reproduce the above
     12  * copyright notice, this list of conditions and the following disclaimer
     13  * in the documentation and/or other materials provided with the
     14  * distribution.
     15  *     * Neither the name of Google Inc. nor the names of its
     16  * contributors may be used to endorse or promote products derived from
     17  * this software without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef SyncCallbackHelper_h
     33 #define SyncCallbackHelper_h
     34 
     35 #include "bindings/core/v8/ExceptionState.h"
     36 #include "core/fileapi/FileError.h"
     37 #include "core/html/VoidCallback.h"
     38 #include "modules/filesystem/DirectoryEntry.h"
     39 #include "modules/filesystem/EntriesCallback.h"
     40 #include "modules/filesystem/EntryCallback.h"
     41 #include "modules/filesystem/EntrySync.h"
     42 #include "modules/filesystem/ErrorCallback.h"
     43 #include "modules/filesystem/FileEntry.h"
     44 #include "modules/filesystem/FileSystemCallback.h"
     45 #include "modules/filesystem/MetadataCallback.h"
     46 #include "platform/heap/Handle.h"
     47 #include "wtf/PassRefPtr.h"
     48 
     49 namespace blink {
     50 
     51 template <typename ResultType, typename CallbackArg>
     52 struct HelperResultType {
     53     DISALLOW_ALLOCATION();
     54 public:
     55     typedef ResultType* ReturnType;
     56     typedef Member<ResultType> StorageType;
     57 
     58     static ReturnType createFromCallbackArg(CallbackArg argument)
     59     {
     60         return ResultType::create(argument);
     61     }
     62 };
     63 
     64 // A helper template for FileSystemSync implementation.
     65 template <typename SuccessCallback, typename CallbackArg, typename ResultType>
     66 class SyncCallbackHelper FINAL : public GarbageCollected<SyncCallbackHelper<SuccessCallback, CallbackArg, ResultType> > {
     67 public:
     68     typedef SyncCallbackHelper<SuccessCallback, CallbackArg, ResultType> HelperType;
     69     typedef HelperResultType<ResultType, CallbackArg> ResultTypeTrait;
     70     typedef typename ResultTypeTrait::StorageType ResultStorageType;
     71     typedef typename ResultTypeTrait::ReturnType ResultReturnType;
     72 
     73     static HelperType* create()
     74     {
     75         return new SyncCallbackHelper();
     76     }
     77 
     78     ResultReturnType getResult(ExceptionState& exceptionState)
     79     {
     80         if (m_errorCode)
     81             FileError::throwDOMException(exceptionState, m_errorCode);
     82 
     83         return m_result;
     84     }
     85 
     86     SuccessCallback* successCallback() { return SuccessCallbackImpl::create(this); }
     87     ErrorCallback* errorCallback() { return ErrorCallbackImpl::create(this); }
     88 
     89     void trace(Visitor* visitor)
     90     {
     91         visitor->trace(m_result);
     92     }
     93 
     94 private:
     95     SyncCallbackHelper()
     96         : m_errorCode(FileError::OK)
     97         , m_completed(false)
     98     {
     99     }
    100 
    101     class SuccessCallbackImpl FINAL : public SuccessCallback {
    102     public:
    103         static SuccessCallbackImpl* create(HelperType* helper)
    104         {
    105             return new SuccessCallbackImpl(helper);
    106         }
    107 
    108         virtual void handleEvent()
    109         {
    110             m_helper->setError(FileError::OK);
    111         }
    112 
    113         virtual void handleEvent(CallbackArg arg)
    114         {
    115             m_helper->setResult(arg);
    116         }
    117 
    118     private:
    119         explicit SuccessCallbackImpl(HelperType* helper)
    120             : m_helper(helper)
    121         {
    122         }
    123         Persistent<HelperType> m_helper;
    124     };
    125 
    126     class ErrorCallbackImpl FINAL : public ErrorCallback {
    127     public:
    128         static ErrorCallbackImpl* create(HelperType* helper)
    129         {
    130             return new ErrorCallbackImpl(helper);
    131         }
    132 
    133         virtual void handleEvent(FileError* error) OVERRIDE
    134         {
    135             ASSERT(error);
    136             m_helper->setError(error->code());
    137         }
    138 
    139     private:
    140         explicit ErrorCallbackImpl(HelperType* helper)
    141             : m_helper(helper)
    142         {
    143         }
    144         Persistent<HelperType> m_helper;
    145     };
    146 
    147     void setError(FileError::ErrorCode code)
    148     {
    149         m_errorCode = code;
    150         m_completed = true;
    151     }
    152 
    153     void setResult(CallbackArg result)
    154     {
    155         m_result = ResultTypeTrait::createFromCallbackArg(result);
    156         m_completed = true;
    157     }
    158 
    159     ResultStorageType m_result;
    160     FileError::ErrorCode m_errorCode;
    161     bool m_completed;
    162 };
    163 
    164 struct EmptyType : public GarbageCollected<EmptyType> {
    165     static EmptyType* create(EmptyType*)
    166     {
    167         return 0;
    168     }
    169 
    170     void trace(Visitor*) { }
    171 };
    172 
    173 typedef SyncCallbackHelper<EntryCallback, Entry*, EntrySync> EntrySyncCallbackHelper;
    174 typedef SyncCallbackHelper<MetadataCallback, Metadata*, Metadata> MetadataSyncCallbackHelper;
    175 typedef SyncCallbackHelper<VoidCallback, EmptyType*, EmptyType> VoidSyncCallbackHelper;
    176 typedef SyncCallbackHelper<FileSystemCallback, DOMFileSystem*, DOMFileSystemSync> FileSystemSyncCallbackHelper;
    177 
    178 } // namespace blink
    179 
    180 #endif // SyncCallbackHelper_h
    181