gecko-dev/dom/file/LockedFile.h

152 lines
2.8 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_lockedfile_h__
#define mozilla_dom_file_lockedfile_h__
#include "FileCommon.h"
#include "nsIDOMLockedFile.h"
#include "nsIRunnable.h"
#include "nsDOMEventTargetHelper.h"
class nsIInputStream;
BEGIN_FILE_NAMESPACE
class FileHandle;
class FileRequest;
class MetadataHelper;
class LockedFile : public nsDOMEventTargetHelper,
public nsIDOMLockedFile,
public nsIRunnable
{
friend class FinishHelper;
friend class FileService;
friend class FileHelper;
friend class MetadataHelper;
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_NSIDOMLOCKEDFILE
NS_DECL_NSIRUNNABLE
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(LockedFile, nsDOMEventTargetHelper)
enum Mode
{
READ_ONLY = 0,
READ_WRITE
};
enum RequestMode
{
NORMAL = 0, // Sequential
PARALLEL
};
enum ReadyState
{
INITIAL = 0,
LOADING,
FINISHING,
DONE
};
static already_AddRefed<LockedFile>
Create(FileHandle* aFileHandle,
Mode aMode,
RequestMode aRequestMode = NORMAL);
// nsIDOMEventTarget
virtual nsresult
PreHandleEvent(nsEventChainPreVisitor& aVisitor);
nsresult
CreateParallelStream(nsISupports** aStream);
nsresult
GetOrCreateStream(nsISupports** aStream);
bool
IsOpen() const;
bool
IsAborted() const
{
return mAborted;
}
FileHandle*
Handle() const
{
return mFileHandle;
}
nsresult
OpenInputStream(bool aWholeFile, uint64_t aStart, uint64_t aLength,
nsIInputStream** aResult);
private:
LockedFile();
~LockedFile();
void
OnNewRequest();
void
OnRequestFinished();
inline already_AddRefed<FileRequest>
GenerateFileRequest();
nsresult
WriteOrAppend(const jsval& aValue, JSContext* aCx,
nsIDOMFileRequest** _retval, bool aAppend);
nsresult
Finish();
nsRefPtr<FileHandle> mFileHandle;
ReadyState mReadyState;
Mode mMode;
RequestMode mRequestMode;
uint64_t mLocation;
uint32_t mPendingRequests;
nsTArray<nsCOMPtr<nsISupports> > mParallelStreams;
nsCOMPtr<nsISupports> mStream;
bool mAborted;
bool mCreating;
};
class FinishHelper MOZ_FINAL : public nsIRunnable
{
friend class LockedFile;
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIRUNNABLE
private:
FinishHelper(LockedFile* aLockedFile);
~FinishHelper()
{ }
nsRefPtr<LockedFile> mLockedFile;
nsTArray<nsCOMPtr<nsISupports> > mParallelStreams;
nsCOMPtr<nsISupports> mStream;
bool mAborted;
};
END_FILE_NAMESPACE
#endif // mozilla_dom_file_lockedfile_h__