/*

 * 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 StorageMap_h

#define StorageMap_h

#if ENABLE(DOM_STORAGE)

#include "PlatformString.h"

#include "StringHash.h"

#include <wtf/HashMap.h>

#include <wtf/PassRefPtr.h>

#include <wtf/RefCounted.h>

namespace WebCore {

    class StorageMap : public RefCounted<StorageMap> {

    public:

        // Quota size mesured in bytes.

        static PassRefPtr<StorageMap> create(unsigned quotaSize);

        unsigned length() const;

        String key(unsigned index);

        String getItem(const String&) const;

        PassRefPtr<StorageMap> setItem(const String& key, const String& value, String& oldValue, bool& quota_exception);

        PassRefPtr<StorageMap> removeItem(const String&, String& oldValue);

        bool contains(const String& key) const;

        void importItem(const String& key, const String& value);

        unsigned quota() const { return m_quotaSize; }

        static const unsigned noQuota = UINT_MAX;

    private:

        StorageMap(unsigned quota);

        PassRefPtr<StorageMap> copy();

        void invalidateIterator();

        void setIteratorToIndex(unsigned);

        HashMap<String, String> m_map;

        HashMap<String, String>::iterator m_iterator;

        unsigned m_iteratorIndex;

        unsigned m_quotaSize;  // Measured in bytes.

        unsigned m_currentLength;  // Measured in UChars.

    };

} // namespace WebCore

#endif // ENABLE(DOM_STORAGE)

#endif // StorageMap_h