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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2013 Samsung Electronics. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SyncCallbackHelper_h
#define SyncCallbackHelper_h
#include "bindings/core/v8/ExceptionState.h"
#include "core/fileapi/FileError.h"
#include "core/html/VoidCallback.h"
#include "modules/filesystem/DirectoryEntry.h"
#include "modules/filesystem/EntriesCallback.h"
#include "modules/filesystem/EntryCallback.h"
#include "modules/filesystem/EntrySync.h"
#include "modules/filesystem/ErrorCallback.h"
#include "modules/filesystem/FileEntry.h"
#include "modules/filesystem/FileSystemCallback.h"
#include "modules/filesystem/MetadataCallback.h"
#include "platform/heap/Handle.h"
#include "wtf/PassRefPtr.h"
namespace blink {
template <typename ResultType, typename CallbackArg>
struct HelperResultType {
DISALLOW_ALLOCATION();
public:
typedef ResultType* ReturnType;
typedef Member<ResultType> StorageType;
static ReturnType createFromCallbackArg(CallbackArg argument)
{
return ResultType::create(argument);
}
};
// A helper template for FileSystemSync implementation.
template <typename SuccessCallback, typename CallbackArg, typename ResultType>
class SyncCallbackHelper final : public GarbageCollected<SyncCallbackHelper<SuccessCallback, CallbackArg, ResultType> > {
public:
typedef SyncCallbackHelper<SuccessCallback, CallbackArg, ResultType> HelperType;
typedef HelperResultType<ResultType, CallbackArg> ResultTypeTrait;
typedef typename ResultTypeTrait::StorageType ResultStorageType;
typedef typename ResultTypeTrait::ReturnType ResultReturnType;
static HelperType* create()
{
return new SyncCallbackHelper();
}
ResultReturnType getResult(ExceptionState& exceptionState)
{
if (m_errorCode)
FileError::throwDOMException(exceptionState, m_errorCode);
return m_result;
}
SuccessCallback* successCallback() { return SuccessCallbackImpl::create(this); }
ErrorCallback* errorCallback() { return ErrorCallbackImpl::create(this); }
void trace(Visitor* visitor)
{
visitor->trace(m_result);
}
private:
SyncCallbackHelper()
: m_errorCode(FileError::OK)
, m_completed(false)
{
}
class SuccessCallbackImpl final : public SuccessCallback {
public:
static SuccessCallbackImpl* create(HelperType* helper)
{
return new SuccessCallbackImpl(helper);
}
virtual void handleEvent()
{
m_helper->setError(FileError::OK);
}
virtual void handleEvent(CallbackArg arg)
{
m_helper->setResult(arg);
}
private:
explicit SuccessCallbackImpl(HelperType* helper)
: m_helper(helper)
{
}
Persistent<HelperType> m_helper;
};
class ErrorCallbackImpl final : public ErrorCallback {
public:
static ErrorCallbackImpl* create(HelperType* helper)
{
return new ErrorCallbackImpl(helper);
}
virtual void handleEvent(FileError* error) override
{
ASSERT(error);
m_helper->setError(error->code());
}
private:
explicit ErrorCallbackImpl(HelperType* helper)
: m_helper(helper)
{
}
Persistent<HelperType> m_helper;
};
void setError(FileError::ErrorCode code)
{
m_errorCode = code;
m_completed = true;
}
void setResult(CallbackArg result)
{
m_result = ResultTypeTrait::createFromCallbackArg(result);
m_completed = true;
}
ResultStorageType m_result;
FileError::ErrorCode m_errorCode;
bool m_completed;
};
struct EmptyType : public GarbageCollected<EmptyType> {
static EmptyType* create(EmptyType*)
{
return 0;
}
void trace(Visitor*) { }
};
typedef SyncCallbackHelper<EntryCallback, Entry*, EntrySync> EntrySyncCallbackHelper;
typedef SyncCallbackHelper<MetadataCallback, Metadata*, Metadata> MetadataSyncCallbackHelper;
typedef SyncCallbackHelper<VoidCallback, EmptyType*, EmptyType> VoidSyncCallbackHelper;
typedef SyncCallbackHelper<FileSystemCallback, DOMFileSystem*, DOMFileSystemSync> FileSystemSyncCallbackHelper;
} // namespace blink
#endif // SyncCallbackHelper_h