/*

 * Copyright (C) 2010 Google 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.

 */

#include "config.h"

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

#include "FileStreamProxy.h"

#include "Blob.h"

#include "CrossThreadTask.h"

#include "FileStream.h"

#include "FileThread.h"

#include "FileThreadTask.h"

#include "PlatformString.h"

#include "ScriptExecutionContext.h"

namespace WebCore {

inline FileStreamProxy::FileStreamProxy(ScriptExecutionContext* context, FileStreamClient* client)

    : m_context(context)

    , m_client(client)

    , m_stream(FileStream::create(this))

{

}

PassRefPtr<FileStreamProxy> FileStreamProxy::create(ScriptExecutionContext* context, FileStreamClient* client)

{

    RefPtr<FileStreamProxy> proxy = adoptRef(new FileStreamProxy(context, client));

    // Hold an ref so that the instance will not get deleted while there are tasks on the file thread.

    // This is balanced by the deref in derefProxyOnContext below.

    proxy->ref();

    proxy->fileThread()->postTask(createFileThreadTask(proxy->m_stream.get(), &FileStream::start));

    return proxy.release();

}

FileStreamProxy::~FileStreamProxy()

{

}

void FileStreamProxy::openForRead(Blob* blob)

{

    fileThread()->postTask(createFileThreadTask(m_stream.get(), &FileStream::openForRead, blob));

}

void FileStreamProxy::openForWrite(const String& path)

{

    fileThread()->postTask(createFileThreadTask(m_stream.get(), &FileStream::openForWrite, path));

}

void FileStreamProxy::close()

{

    fileThread()->postTask(createFileThreadTask(m_stream.get(), &FileStream::close));

}

void FileStreamProxy::read(char* buffer, int length)

{

    fileThread()->postTask(createFileThreadTask(m_stream.get(), &FileStream::read, buffer, length));

}

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

{

    fileThread()->postTask(createFileThreadTask(m_stream.get(), &FileStream::write, blob, position, length));

}

void FileStreamProxy::truncate(long long position)

{

    fileThread()->postTask(createFileThreadTask(m_stream.get(), &FileStream::truncate, position));

}

FileThread* FileStreamProxy::fileThread()

{

    ASSERT(m_context->isContextThread());

    ASSERT(m_context->fileThread());

    return m_context->fileThread();

}

void FileStreamProxy::stop()

{

    // Clear the client so that we won't be calling callbacks on the client.

    m_client = 0;

    fileThread()->unscheduleTasks(m_stream.get());

    fileThread()->postTask(createFileThreadTask(m_stream.get(), &FileStream::stop));

}

static void notifyGetSizeOnContext(ScriptExecutionContext*, FileStreamProxy* proxy, long long size)

{

    if (proxy->client())

        proxy->client()->didGetSize(size);

}

void FileStreamProxy::didGetSize(long long size)

{

    ASSERT(!m_context->isContextThread());

    m_context->postTask(createCallbackTask(&notifyGetSizeOnContext, this, size));

}

static void notifyReadOnContext(ScriptExecutionContext*, FileStreamProxy* proxy, const char* data, int bytesRead)

{

    if (proxy->client())

        proxy->client()->didRead(data, bytesRead);

}

void FileStreamProxy::didRead(const char* data, int bytesRead)

{

    ASSERT(!m_context->isContextThread());

    m_context->postTask(createCallbackTask(&notifyReadOnContext, this, data, bytesRead));

}

static void notifyWriteOnContext(ScriptExecutionContext*, FileStreamProxy* proxy, int bytesWritten)

{

    if (proxy->client())

        proxy->client()->didWrite(bytesWritten);

}

void FileStreamProxy::didWrite(int bytesWritten)

{

    ASSERT(!m_context->isContextThread());

    m_context->postTask(createCallbackTask(&notifyWriteOnContext, this, bytesWritten));

}

static void notifyStartOnContext(ScriptExecutionContext*, FileStreamProxy* proxy)

{

    if (proxy->client())

        proxy->client()->didStart();

}

void FileStreamProxy::didStart()

{

    ASSERT(!m_context->isContextThread());

    m_context->postTask(createCallbackTask(&notifyStartOnContext, this));

}

static void notifyFinishOnContext(ScriptExecutionContext*, FileStreamProxy* proxy)

{

    if (proxy->client())

        proxy->client()->didFinish();

}

void FileStreamProxy::didFinish()

{

    ASSERT(!m_context->isContextThread());

    m_context->postTask(createCallbackTask(&notifyFinishOnContext, this));

}

static void notifyFailOnContext(ScriptExecutionContext*, FileStreamProxy* proxy, ExceptionCode ec)

{

    if (proxy->client())

        proxy->client()->didFail(ec);

}

void FileStreamProxy::didFail(ExceptionCode ec)

{

    ASSERT(!m_context->isContextThread());

    m_context->postTask(createCallbackTask(&notifyFailOnContext, this, ec));

}

static void derefProxyOnContext(ScriptExecutionContext*, FileStreamProxy* proxy)

{

    ASSERT(proxy->hasOneRef());

    proxy->deref();

}

void FileStreamProxy::didStop()

{

    m_context->postTask(createCallbackTask(&derefProxyOnContext, this));

}

} // namespace WebCore

#endif // ENABLE(FILE_WRITER)