1/*
2 * Copyright (C) 2009 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef WebAccessibilityCacheImpl_h
32#define WebAccessibilityCacheImpl_h
33
34#include "AccessibilityObjectWrapper.h"
35#include "WebAccessibilityCache.h"
36#include <wtf/HashMap.h>
37#include <wtf/PassRefPtr.h>
38
39namespace WebKit {
40
41// FIXME: Should be eliminated to use AXObjectCache instead.
42class WebAccessibilityCacheImpl : public WebKit::WebAccessibilityCache {
43public:
44    virtual void initialize(WebView* view);
45    virtual bool isInitialized() const { return m_initialized; }
46
47    virtual WebAccessibilityObject getObjectById(int);
48    virtual int addOrGetId(const WebKit::WebAccessibilityObject&);
49    virtual bool isCached(const WebAccessibilityObject&);
50
51    virtual void remove(int);
52    virtual void clear();
53
54protected:
55    friend class WebKit::WebAccessibilityCache;
56
57    WebAccessibilityCacheImpl();
58    ~WebAccessibilityCacheImpl();
59
60private:
61    // FIXME: This can be just part of Chromium's AccessibilityObjectWrapper.
62    class WeakHandle : public WebCore::AccessibilityObjectWrapper {
63    public:
64        static PassRefPtr<WeakHandle> create(WebCore::AccessibilityObject*);
65        virtual void detach();
66    private:
67        WeakHandle(WebCore::AccessibilityObject*);
68    };
69
70    typedef HashMap<int, RefPtr<WeakHandle> > ObjectMap;
71    typedef HashMap<WebCore::AccessibilityObject*, int> IdMap;
72
73    // Hashmap for caching of elements in use by the AT, mapping id (int) to
74    // WebAccessibilityObject.
75    ObjectMap m_objectMap;
76    // Hashmap for caching of elements in use by the AT, mapping a
77    // AccessibilityObject pointer to its id (int). Needed for reverse lookup,
78    // to ensure unnecessary duplicate entries are not created in the
79    // ObjectMap and for focus changes in WebKit.
80    IdMap m_idMap;
81
82    // Unique identifier for retrieving an accessibility object from the page's
83    // hashmaps. Id is always 0 for the root of the accessibility object
84    // hierarchy (on a per-renderer process basis).
85    int m_nextNewId;
86
87    bool m_initialized;
88};
89
90}
91
92#endif
93