/*
 * Copyright (C) 2008 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 StorageArea_h
#define StorageArea_h

#include <wtf/Forward.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/text/WTFString.h>

namespace WebCore {

    class Frame;
    class SecurityOrigin;
    class StorageSyncManager;
    typedef int ExceptionCode;
    enum StorageType { LocalStorage, SessionStorage };

    // This interface is required for Chromium since these actions need to be proxied between processes.
    class StorageArea : public RefCounted<StorageArea> {
    public:
        virtual ~StorageArea() { }

        // The HTML5 DOM Storage API
        // FIXME: We should pass Document instead of Frame. Also, that parameter should go first.
        virtual unsigned length(ExceptionCode&, Frame* sourceFrame) const = 0;
        virtual String key(unsigned index, ExceptionCode&, Frame* sourceFrame) const = 0;
        virtual String getItem(const String& key, ExceptionCode&, Frame* sourceFrame) const = 0;
        virtual void setItem(const String& key, const String& value, ExceptionCode&, Frame* sourceFrame) = 0;
        virtual void removeItem(const String& key, ExceptionCode&, Frame* sourceFrame) = 0;
        virtual void clear(ExceptionCode&, Frame* sourceFrame) = 0;
        virtual bool contains(const String& key, ExceptionCode&, Frame* sourceFrame) const = 0;

        virtual bool canAccessStorage(Frame*) const = 0;

        virtual size_t memoryBytesUsedByCache() const = 0;

        virtual void incrementAccessCount() { }
        virtual void decrementAccessCount() { }
    };

} // namespace WebCore

#endif // StorageArea_h
