sky/engine/core/dom/DocumentOrderedMap.cpp

/*
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 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
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 *
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#include "sky/engine/core/dom/DocumentOrderedMap.h"

#include "sky/engine/core/dom/Element.h"
#include "sky/engine/core/dom/ElementTraversal.h"
#include "sky/engine/core/dom/TreeScope.h"

namespace blink {

PassOwnPtr<DocumentOrderedMap> DocumentOrderedMap::create()
{
    return adoptPtr(new DocumentOrderedMap());
}

void DocumentOrderedMap::add(const AtomicString& key, Element* element)
{
    ASSERT(key);
    ASSERT(element);

    Map::AddResult addResult = m_map.add(key, adoptPtr(new MapEntry(element)));
    if (addResult.isNewEntry)
        return;

    OwnPtr<MapEntry>& entry = addResult.storedValue->value;
    ASSERT(entry->count);
    entry->element = nullptr;
    entry->count++;
}

void DocumentOrderedMap::remove(const AtomicString& key, Element* element)
{
    ASSERT(key);
    ASSERT(element);

    Map::iterator it = m_map.find(key);
    if (it == m_map.end())
        return;

    OwnPtr<MapEntry>& entry = it->value;
    ASSERT(entry->count);

    entry->count--;
    if (!entry->count)
        m_map.remove(it);
    else if (entry->element == element)
        entry->element = nullptr;
}

Element* DocumentOrderedMap::getElementById(const AtomicString& key, const TreeScope* scope) const
{
    ASSERT(key);
    ASSERT(scope);

    MapEntry* entry = m_map.get(key);
    if (!entry)
        return 0;

    ASSERT(entry->count);
    if (entry->element)
        return entry->element;

    // We know there's at least one node that matches; iterate to find the first one.
    for (Element* element = ElementTraversal::firstWithin(scope->rootNode()); element; element = ElementTraversal::next(*element)) {
        if (element->getIdAttribute() != key)
            continue;
        entry->element = element;
        return element;
    }
    ASSERT_NOT_REACHED();
    return 0;
}

} // namespace blink