/*

 * Copyright (C) 2009 Google Inc. All rights reserved.

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 * modification, are permitted provided that the following conditions are

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 *

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 * in the documentation and/or other materials provided with the

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 *

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#ifndef WebAccessibilityCacheImpl_h

#define WebAccessibilityCacheImpl_h

#include "AccessibilityObjectWrapper.h"

#include "WebAccessibilityCache.h"

#include <wtf/HashMap.h>

#include <wtf/PassRefPtr.h>

namespace WebKit {

// FIXME: Should be eliminated to use AXObjectCache instead.

class WebAccessibilityCacheImpl : public WebKit::WebAccessibilityCache {

public:

    virtual void initialize(WebView* view);

    virtual bool isInitialized() const { return m_initialized; }

    virtual WebAccessibilityObject getObjectById(int);

    virtual bool isValidId(int) const;

    virtual int addOrGetId(const WebKit::WebAccessibilityObject&);

    virtual void remove(int);

    virtual void clear();

protected:

    friend class WebKit::WebAccessibilityCache;

    WebAccessibilityCacheImpl();

    ~WebAccessibilityCacheImpl();

private:

    // FIXME: This can be just part of Chromium's AccessibilityObjectWrapper.

    class WeakHandle : public WebCore::AccessibilityObjectWrapper {

    public:

        static PassRefPtr<WeakHandle> create(WebCore::AccessibilityObject*);

        virtual void detach();

    private:

        WeakHandle(WebCore::AccessibilityObject*);

    };

    typedef HashMap<int, RefPtr<WeakHandle> > ObjectMap;

    typedef HashMap<WebCore::AccessibilityObject*, int> IdMap;

    // Hashmap for caching of elements in use by the AT, mapping id (int) to

    // WebAccessibilityObject.

    ObjectMap m_objectMap;

    // Hashmap for caching of elements in use by the AT, mapping a

    // AccessibilityObject pointer to its id (int). Needed for reverse lookup,

    // to ensure unnecessary duplicate entries are not created in the

    // ObjectMap and for focus changes in WebKit.

    IdMap m_idMap;

    // Unique identifier for retrieving an accessibility object from the page's

    // hashmaps. Id is always 0 for the root of the accessibility object

    // hierarchy (on a per-renderer process basis).

    int m_nextNewId;

    bool m_initialized;

};

}

#endif