/*
 * 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

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

namespace WebCore {

    class StorageMap : public RefCounted<StorageMap> {
    public:
        // Quota size measured 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:
        explicit 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 // StorageMap_h
