/*

 * Copyright (C) 2010 Google Inc.  All rights reserved.

 * Copyright (C) 2010 Apple Inc. 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 FileStreamProxy_h

#define FileStreamProxy_h

#if ENABLE(FILE_READER) || ENABLE(FILE_WRITER)

#include "FileStreamClient.h"

#include <wtf/PassRefPtr.h>

#include <wtf/RefCounted.h>

#include <wtf/RefPtr.h>

namespace WebCore {

class Blob;

class FileStream;

class FileThread;

class ScriptExecutionContext;

class String;

// A proxy module that calls corresponding FileStream methods on the file thread.  Note: you must call stop() first and then release the reference to destruct the FileStreamProxy instance.

class FileStreamProxy : public RefCounted<FileStreamProxy>, public FileStreamClient {

public:

    static PassRefPtr<FileStreamProxy> create(ScriptExecutionContext*, FileStreamClient*);

    virtual ~FileStreamProxy();

    void openForRead(Blob* blob);

    void openForWrite(const String& path);

    void close();

    void read(char* buffer, int length);

    void write(Blob* blob, long long position, int length);

    void truncate(long long position);

    // Stops the proxy and scedules it to be destructed.  All the pending tasks will be aborted and the file stream will be closed.

    // Note: the caller should deref the instance immediately after calling stop().

    void stop();

    FileStreamClient* client() const { return m_client; }

private:

    FileStreamProxy(ScriptExecutionContext*, FileStreamClient*);

    // FileStreamClient methods.

    virtual void didGetSize(long long);

    virtual void didRead(const char*, int);

    virtual void didWrite(int);

    virtual void didFinish();

    virtual void didFail(ExceptionCode);

    virtual void didStart();

    virtual void didStop();

    FileThread* fileThread();

    RefPtr<ScriptExecutionContext> m_context;

    FileStreamClient* m_client;

    RefPtr<FileStream> m_stream;

};

} // namespace WebCore

#endif // ENABLE(FILE_READER) || ENABLE(FILE_WRITER)

#endif // FileStreamProxy_h