#ifndef SyncCallbackHelper_h
#define SyncCallbackHelper_h
#include "bindings/v8/ExceptionState.h"
#include "core/fileapi/FileError.h"
#include "core/html/VoidCallback.h"
#include "heap/Handle.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 "wtf/PassRefPtr.h"
#include "wtf/RefCounted.h"
namespace WebCore {
template <typename ResultType, typename CallbackArg>
struct HelperResultType {
DISALLOW_ALLOCATION();
public:
typedef PassRefPtrWillBeRawPtr<ResultType> ReturnType;
typedef RefPtrWillBePersistent<ResultType> StorageType;
static ReturnType createFromCallbackArg(CallbackArg argument)
{
return ResultType::create(argument);
}
};
template <typename SuccessCallback, typename CallbackArg, typename ResultType>
class SyncCallbackHelper FINAL : public RefCounted<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 PassRefPtr<HelperType> create()
{
return adoptRef(new SyncCallbackHelper());
}
ResultReturnType getResult(ExceptionState& exceptionState)
{
if (m_errorCode)
FileError::throwDOMException(exceptionState, m_errorCode);
return m_result;
}
PassOwnPtr<SuccessCallback> successCallback() { return SuccessCallbackImpl::create(this); }
PassOwnPtr<ErrorCallback> errorCallback() { return ErrorCallbackImpl::create(this); }
private:
SyncCallbackHelper()
: m_errorCode(FileError::OK)
, m_completed(false)
{
}
class SuccessCallbackImpl FINAL : public SuccessCallback {
public:
static PassOwnPtr<SuccessCallbackImpl> create(PassRefPtr<HelperType> helper)
{
return adoptPtr(new SuccessCallbackImpl(helper));
}
virtual void handleEvent()
{
m_helper->setError(FileError::OK);
}
virtual void handleEvent(CallbackArg arg)
{
m_helper->setResult(arg);
}
private:
explicit SuccessCallbackImpl(PassRefPtr<HelperType> helper)
: m_helper(helper)
{
}
RefPtr<HelperType> m_helper;
};
class ErrorCallbackImpl FINAL : public ErrorCallback {
public:
static PassOwnPtr<ErrorCallbackImpl> create(PassRefPtr<HelperType> helper)
{
return adoptPtr(new ErrorCallbackImpl(helper));
}
virtual void handleEvent(FileError* error) OVERRIDE
{
ASSERT(error);
m_helper->setError(error->code());
}
private:
explicit ErrorCallbackImpl(PassRefPtr<HelperType> helper)
: m_helper(helper)
{
}
RefPtr<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 RefCountedWillBeGarbageCollected<EmptyType> {
static PassRefPtrWillBeRawPtr<EmptyType> create(EmptyType*)
{
return nullptr;
}
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;
}
#endif