/*

 * Copyright (C) 2003, 2006 Apple Computer, 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 COMPUTER, 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 COMPUTER, 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 AXObjectCache_h

#define AXObjectCache_h

#include <limits.h>

#include <wtf/HashMap.h>

#include <wtf/HashSet.h>

#ifdef __OBJC__

@class WebCoreAXObject;

@class WebCoreTextMarker;

#else

class WebCoreAXObject;

class WebCoreTextMarker;

#endif

namespace WebCore {

    class RenderObject;

    class String;

    class VisiblePosition;

    typedef unsigned AXID;

    struct AXIDHashTraits : WTF::GenericHashTraits<unsigned> {

        static TraitType deletedValue() { return UINT_MAX; }

    };

    class AXObjectCache {

    public:

        ~AXObjectCache();

        WebCoreAXObject* get(RenderObject*);

        void remove(RenderObject*);

        void removeAXID(WebCoreAXObject*);

        WebCoreTextMarker* textMarkerForVisiblePosition(const VisiblePosition&);

        VisiblePosition visiblePositionForTextMarker(WebCoreTextMarker*);

        void childrenChanged(RenderObject*);

        void postNotification(RenderObject*, const String& message);

        void postNotificationToElement(RenderObject*, const String& message);

        void handleFocusedUIElementChanged();

        static void enableAccessibility() { gAccessibilityEnabled = true; }

        static bool accessibilityEnabled() { return gAccessibilityEnabled; }

    private:

        static bool gAccessibilityEnabled;

        AXID getAXID(WebCoreAXObject*);

        HashMap<RenderObject*, WebCoreAXObject*> m_objects;

        HashSet<AXID, IntHash<AXID>, AXIDHashTraits> m_idsInUse;

    };

#if !PLATFORM(MAC)

    inline AXObjectCache::~AXObjectCache() { }

    inline WebCoreAXObject* AXObjectCache::get(RenderObject*) { return 0; }

    inline void AXObjectCache::remove(RenderObject*) { }

    inline void AXObjectCache::removeAXID(WebCoreAXObject*) { }

    inline void AXObjectCache::childrenChanged(RenderObject*) { }

    inline void AXObjectCache::postNotification(RenderObject*, const String&) { }

    inline void AXObjectCache::postNotificationToElement(RenderObject*, const String&) { }

    inline void AXObjectCache::handleFocusedUIElementChanged() { }

#endif

}

#endif