/*

    Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Library General Public

    License as published by the Free Software Foundation; either

    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License

    along with this library; see the file COPYING.LIB.  If not, write to

    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

    Boston, MA 02110-1301, USA.

*/

#ifndef JSSVGContextCache_h

#define JSSVGContextCache_h

#if ENABLE(SVG)

#include "SVGElement.h"

#include <wtf/StdLibExtras.h>

namespace WebCore {

class DOMObject;

class JSSVGContextCache : public Noncopyable {

public:

    typedef HashMap<DOMObject*, SVGElement*> WrapperMap;

    static WrapperMap& wrapperMap()

    {

        DEFINE_STATIC_LOCAL(WrapperMap, s_wrapperMap, ());

        return s_wrapperMap;

    }

    static void addWrapper(DOMObject* wrapper, SVGElement* context)

    {

        ASSERT(wrapper);

        ASSERT(context);

        pair<WrapperMap::iterator, bool> result = wrapperMap().add(wrapper, context);

        if (result.second) {

            WrapperMap::iterator& it = result.first;

            ASSERT_UNUSED(it, it->second == context);

        }

    }

    static void forgetWrapper(DOMObject* wrapper)

    {

        ASSERT(wrapper);

        WrapperMap& map = wrapperMap();

        WrapperMap::iterator it = map.find(wrapper);

        if (it == map.end())

            return;

        map.remove(it);

    }

    static void propagateSVGDOMChange(DOMObject* wrapper, const QualifiedName& attributeName)

    {

        WrapperMap& map = wrapperMap();

        WrapperMap::iterator it = map.find(wrapper);

        if (it == map.end())

            return;

        SVGElement* context = it->second;

        ASSERT(context);

        context->svgAttributeChanged(attributeName);

    }

    static SVGElement* svgContextForDOMObject(DOMObject* wrapper)

    {

        ASSERT(wrapper);

        WrapperMap& map = wrapperMap();

        WrapperMap::iterator it = map.find(wrapper);

        if (it == map.end())

            return 0;

        SVGElement* context = it->second;

        ASSERT(context);

        return context;

    }

};

}

#endif

#endif