Source/WebKit/chromium/public/WebFileWriter.h

/*
 * 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
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 */

#ifndef WebFileWriter_h
#define WebFileWriter_h

#include "WebCommon.h"
#include "WebString.h"

namespace WebKit {

class WebURL;

class WebFileWriter {
public:
    virtual ~WebFileWriter() { }

    // Only one write or one truncate operation can be in progress at a time.
    // These functions are asynchronous and will report results through the WebFileWriter's associated WebFileWriterClient.
    virtual void write(long long position, const WebURL& blobURL) = 0;
    virtual void truncate(long long length) = 0;

    // Cancel will attempt to abort a running write or truncate.  However, it may not be possible to cancel an in-progress action, or the call may have come in too late.  Partial writes are possible.
    // Do not call cancel when there is no write or truncate in progress.
    virtual void cancel() = 0;
};
    
} // namespace WebKit

#endif