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      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 #include "config.h"
     32 #include "WebAccessibilityCacheImpl.h"
     33 
     34 #include "AccessibilityObject.h"
     35 #include "AXObjectCache.h"
     36 #include "Document.h"
     37 #include "Frame.h"
     38 
     39 #include "WebAccessibilityObject.h"
     40 #include "WebFrameImpl.h"
     41 #include "WebViewImpl.h"
     42 
     43 using namespace WebCore;
     44 
     45 namespace WebKit {
     46 
     47 const int invalidObjectId = -1;
     48 const int firstObjectId = 1000;
     49 
     50 static PassRefPtr<AccessibilityObject> toAccessibilityObject(const WebAccessibilityObject& object)
     51 {
     52     return object;
     53 }
     54 
     55 // WebView ----------------------------------------------------------------
     56 
     57 WebAccessibilityCache* WebAccessibilityCache::create()
     58 {
     59     return new WebAccessibilityCacheImpl();
     60 }
     61 
     62 // WeakHandle -------------------------------------------------------------
     63 
     64 PassRefPtr<WebAccessibilityCacheImpl::WeakHandle> WebAccessibilityCacheImpl::WeakHandle::create(AccessibilityObject* object)
     65 {
     66     RefPtr<WebAccessibilityCacheImpl::WeakHandle> weakHandle = adoptRef(new WebAccessibilityCacheImpl::WeakHandle(object));
     67     weakHandle->m_object->setWrapper(weakHandle.get());
     68 
     69     return weakHandle.release();
     70 }
     71 
     72 WebAccessibilityCacheImpl::WeakHandle::WeakHandle(AccessibilityObject* object)
     73     : AccessibilityObjectWrapper(object)
     74 {
     75 }
     76 
     77 // WebAccessibilityCacheImpl ----------------------------------------
     78 
     79 void WebAccessibilityCacheImpl::WeakHandle::detach()
     80 {
     81     if (m_object)
     82         m_object = 0;
     83 }
     84 
     85 WebAccessibilityCacheImpl::WebAccessibilityCacheImpl()
     86     : m_nextNewId(firstObjectId)
     87     , m_initialized(false)
     88 {
     89 }
     90 
     91 WebAccessibilityCacheImpl::~WebAccessibilityCacheImpl()
     92 {
     93 }
     94 
     95 void WebAccessibilityCacheImpl::initialize(WebView* view)
     96 {
     97     AXObjectCache::enableAccessibility();
     98     WebAccessibilityObject root = view->accessibilityObject();
     99     if (root.isNull())
    100         return;
    101 
    102     RefPtr<AccessibilityObject> rootObject = toAccessibilityObject(root);
    103 
    104     // Insert root in hashmaps.
    105     m_objectMap.set(m_nextNewId, WeakHandle::create(rootObject.get()));
    106     m_idMap.set(rootObject.get(), m_nextNewId++);
    107 
    108     m_initialized = true;
    109 }
    110 
    111 WebAccessibilityObject WebAccessibilityCacheImpl::getObjectById(int id)
    112 {
    113     ObjectMap::iterator it = m_objectMap.find(id);
    114 
    115     if (it == m_objectMap.end() || !it->second)
    116         return WebAccessibilityObject();
    117 
    118     return WebAccessibilityObject(it->second->accessibilityObject());
    119 }
    120 
    121 void WebAccessibilityCacheImpl::remove(int id)
    122 {
    123     ObjectMap::iterator it = m_objectMap.find(id);
    124 
    125     if (it == m_objectMap.end())
    126         return;
    127 
    128     if (it->second) {
    129         // Erase element from reverse hashmap.
    130         IdMap::iterator it2 = m_idMap.find(it->second->accessibilityObject());
    131         if (it2 != m_idMap.end())
    132             m_idMap.remove(it2);
    133     }
    134 
    135     m_objectMap.remove(it);
    136 }
    137 
    138 void WebAccessibilityCacheImpl::clear()
    139 {
    140     m_objectMap.clear();
    141     m_idMap.clear();
    142 }
    143 
    144 int WebAccessibilityCacheImpl::addOrGetId(const WebAccessibilityObject& object)
    145 {
    146     if (!object.isValid())
    147         return invalidObjectId;
    148 
    149     RefPtr<AccessibilityObject> o = toAccessibilityObject(object);
    150 
    151     IdMap::iterator it = m_idMap.find(o.get());
    152 
    153     if (it != m_idMap.end())
    154         return it->second;
    155 
    156     // Insert new accessibility object in hashmaps and return its newly
    157     // assigned accessibility object id.
    158     m_objectMap.set(m_nextNewId, WeakHandle::create(o.get()));
    159     m_idMap.set(o.get(), m_nextNewId);
    160 
    161     return m_nextNewId++;
    162 }
    163 
    164 bool WebAccessibilityCacheImpl::isCached(const WebAccessibilityObject& object)
    165 {
    166     if (!object.isValid())
    167         return false;
    168 
    169     RefPtr<AccessibilityObject> o = toAccessibilityObject(object);
    170     IdMap::iterator it = m_idMap.find(o.get());
    171     if (it == m_idMap.end())
    172         return false;
    173 
    174     return true;
    175 }
    176 
    177 }
    178