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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     // FIXME: Remove resetting ref-count from AccessibilityObjectWrapper
     67     // and convert to use adoptRef.
     68     return new WebAccessibilityCacheImpl::WeakHandle(object);
     69 }
     70 
     71 WebAccessibilityCacheImpl::WeakHandle::WeakHandle(AccessibilityObject* object)
     72     : AccessibilityObjectWrapper(object)
     73 {
     74     m_object->setWrapper(this);
     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 bool WebAccessibilityCacheImpl::isValidId(int id) const
    122 {
    123     return id >= firstObjectId;
    124 }
    125 
    126 void WebAccessibilityCacheImpl::remove(int id)
    127 {
    128     ObjectMap::iterator it = m_objectMap.find(id);
    129 
    130     if (it == m_objectMap.end())
    131         return;
    132 
    133     if (it->second) {
    134         // Erase element from reverse hashmap.
    135         IdMap::iterator it2 = m_idMap.find(it->second->accessibilityObject());
    136         if (it2 != m_idMap.end())
    137             m_idMap.remove(it2);
    138     }
    139 
    140     m_objectMap.remove(it);
    141 }
    142 
    143 void WebAccessibilityCacheImpl::clear()
    144 {
    145     m_objectMap.clear();
    146     m_idMap.clear();
    147 }
    148 
    149 int WebAccessibilityCacheImpl::addOrGetId(const WebAccessibilityObject& object)
    150 {
    151     if (object.isNull())
    152         return invalidObjectId;
    153 
    154     RefPtr<AccessibilityObject> o = toAccessibilityObject(object);
    155 
    156     IdMap::iterator it = m_idMap.find(o.get());
    157 
    158     if (it != m_idMap.end())
    159         return it->second;
    160 
    161     // Insert new accessibility object in hashmaps and return its newly
    162     // assigned accessibility object id.
    163     m_objectMap.set(m_nextNewId, WeakHandle::create(o.get()));
    164     m_idMap.set(o.get(), m_nextNewId);
    165 
    166     return m_nextNewId++;
    167 }
    168 
    169 }
    170