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/*
* Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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.
*/
#include "config.h"
#include "DocumentOrderedMap.h"
#include "Element.h"
#include "HTMLMapElement.h"
#include "HTMLNames.h"
#include "TreeScope.h"
namespace WebCore {
using namespace HTMLNames;
inline bool keyMatchesId(AtomicStringImpl* key, Element* element)
{
return element->hasID() && element->getIdAttribute().impl() == key;
}
inline bool keyMatchesMapName(AtomicStringImpl* key, Element* element)
{
return element->hasTagName(mapTag) && static_cast<HTMLMapElement*>(element)->getName().impl() == key;
}
inline bool keyMatchesLowercasedMapName(AtomicStringImpl* key, Element* element)
{
return element->hasTagName(mapTag) && static_cast<HTMLMapElement*>(element)->getName().lower().impl() == key;
}
void DocumentOrderedMap::clear()
{
m_map.clear();
m_duplicateCounts.clear();
}
void DocumentOrderedMap::add(AtomicStringImpl* key, Element* element)
{
ASSERT(key);
ASSERT(element);
if (!m_duplicateCounts.contains(key)) {
// Fast path. The key is not already in m_duplicateCounts, so we assume that it's
// also not already in m_map and try to add it. If that add succeeds, we're done.
pair<Map::iterator, bool> addResult = m_map.add(key, element);
if (addResult.second)
return;
// The add failed, so this key was already cached in m_map.
// There are multiple elements with this key. Remove the m_map
// cache for this key so get searches for it next time it is called.
m_map.remove(addResult.first);
m_duplicateCounts.add(key);
} else {
// There are multiple elements with this key. Remove the m_map
// cache for this key so get will search for it next time it is called.
Map::iterator cachedItem = m_map.find(key);
if (cachedItem != m_map.end()) {
m_map.remove(cachedItem);
m_duplicateCounts.add(key);
}
}
m_duplicateCounts.add(key);
}
void DocumentOrderedMap::remove(AtomicStringImpl* key, Element* element)
{
ASSERT(key);
ASSERT(element);
m_map.checkConsistency();
Map::iterator cachedItem = m_map.find(key);
if (cachedItem != m_map.end() && cachedItem->second == element)
m_map.remove(cachedItem);
else
m_duplicateCounts.remove(key);
}
template<bool keyMatches(AtomicStringImpl*, Element*)>
inline Element* DocumentOrderedMap::get(AtomicStringImpl* key, const TreeScope* scope) const
{
ASSERT(key);
m_map.checkConsistency();
Element* element = m_map.get(key);
if (element)
return element;
if (m_duplicateCounts.contains(key)) {
// We know there's at least one node that matches; iterate to find the first one.
for (Node* node = scope->firstChild(); node; node = node->traverseNextNodeFastPath()) {
if (!node->isElementNode())
continue;
element = static_cast<Element*>(node);
if (!keyMatches(key, element))
continue;
m_duplicateCounts.remove(key);
m_map.set(key, element);
return element;
}
ASSERT_NOT_REACHED();
}
return 0;
}
Element* DocumentOrderedMap::getElementById(AtomicStringImpl* key, const TreeScope* scope) const
{
return get<keyMatchesId>(key, scope);
}
Element* DocumentOrderedMap::getElementByMapName(AtomicStringImpl* key, const TreeScope* scope) const
{
return get<keyMatchesMapName>(key, scope);
}
Element* DocumentOrderedMap::getElementByLowercasedMapName(AtomicStringImpl* key, const TreeScope* scope) const
{
return get<keyMatchesLowercasedMapName>(key, scope);
}
} // namespace WebCore
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