gecko-dev/dom/file/MetadataHelper.h

116 строки
2.3 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_file_metadatahelper_h__
#define mozilla_dom_file_metadatahelper_h__
#include "mozilla/Attributes.h"
#include "FileCommon.h"
#include "nsIFileStreams.h"
#include "AsyncHelper.h"
#include "FileHelper.h"
class nsIFileStream;
BEGIN_FILE_NAMESPACE
class MetadataHelper;
class MetadataParameters
{
friend class MetadataHelper;
public:
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MetadataParameters)
MetadataParameters(bool aSizeRequested, bool aLastModifiedRequested)
: mSizeRequested(aSizeRequested)
, mLastModifiedRequested(aLastModifiedRequested)
{
}
bool
IsConfigured() const
{
return mSizeRequested || mLastModifiedRequested;
}
bool
SizeRequested() const
{
return mSizeRequested;
}
bool
LastModifiedRequested() const
{
return mLastModifiedRequested;
}
uint64_t
Size() const
{
return mSize;
}
int64_t
LastModified() const
{
return mLastModified;
}
private:
uint64_t mSize;
int64_t mLastModified;
bool mSizeRequested;
bool mLastModifiedRequested;
};
class MetadataHelper : public FileHelper
{
public:
MetadataHelper(LockedFile* aLockedFile,
FileRequest* aFileRequest,
MetadataParameters* aParams)
: FileHelper(aLockedFile, aFileRequest),
mParams(aParams)
{ }
nsresult
DoAsyncRun(nsISupports* aStream) MOZ_OVERRIDE;
nsresult
GetSuccessResult(JSContext* aCx,
JS::MutableHandle<JS::Value> aVal) MOZ_OVERRIDE;
protected:
class AsyncMetadataGetter : public AsyncHelper
{
public:
AsyncMetadataGetter(nsISupports* aStream, MetadataParameters* aParams,
bool aReadWrite)
: AsyncHelper(aStream),
mParams(aParams), mReadWrite(aReadWrite)
{ }
protected:
nsresult
DoStreamWork(nsISupports* aStream) MOZ_OVERRIDE;
private:
nsRefPtr<MetadataParameters> mParams;
bool mReadWrite;
};
nsRefPtr<MetadataParameters> mParams;
};
END_FILE_NAMESPACE
#endif // mozilla_dom_file_metadatahelper_h__