Source/WebCore/dom/DocumentOrderedMap.h

/*
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 * notice, this list of conditions and the following disclaimer.
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#ifndef DocumentOrderedMap_h
#define DocumentOrderedMap_h

#include <wtf/HashCountedSet.h>
#include <wtf/HashMap.h>
#include <wtf/Vector.h>
#include <wtf/text/AtomicStringImpl.h>

namespace WebCore {

class Element;
class HTMLImageElement;
class HTMLLabelElement;
class HTMLMapElement;
class TreeScope;

class DocumentOrderedMap {
public:
    void add(const AtomicStringImpl&, Element&, const TreeScope&);
    void remove(const AtomicStringImpl&, Element&);
    void clear();

    bool contains(const AtomicStringImpl&) const;
    bool containsSingle(const AtomicStringImpl&) const;
    bool containsMultiple(const AtomicStringImpl&) const;

    // concrete instantiations of the get<>() method template
    Element* getElementById(const AtomicStringImpl&, const TreeScope&) const;
    Element* getElementByName(const AtomicStringImpl&, const TreeScope&) const;
    HTMLMapElement* getElementByMapName(const AtomicStringImpl&, const TreeScope&) const;
    HTMLMapElement* getElementByLowercasedMapName(const AtomicStringImpl&, const TreeScope&) const;
    HTMLImageElement* getElementByLowercasedUsemap(const AtomicStringImpl&, const TreeScope&) const;
    HTMLLabelElement* getElementByLabelForAttribute(const AtomicStringImpl&, const TreeScope&) const;
    Element* getElementByWindowNamedItem(const AtomicStringImpl&, const TreeScope&) const;
    Element* getElementByDocumentNamedItem(const AtomicStringImpl&, const TreeScope&) const;

    const Vector<Element*>* getAllElementsById(const AtomicStringImpl&, const TreeScope&) const;

private:
    template<bool keyMatches(const AtomicStringImpl&, const Element&)> Element* get(const AtomicStringImpl&, const TreeScope&) const;

    struct MapEntry {
        MapEntry()
            : element(0)
            , count(0)
        { }
        explicit MapEntry(Element* firstElement)
            : element(firstElement)
            , count(1)
        { }

        Element* element;
        unsigned count;
        Vector<Element*> orderedList;
    };

    typedef HashMap<const AtomicStringImpl*, MapEntry> Map;

    mutable Map m_map;
};

inline bool DocumentOrderedMap::containsSingle(const AtomicStringImpl& id) const
{
    auto it = m_map.find(&id);
    return it != m_map.end() && it->value.count == 1;
}

inline bool DocumentOrderedMap::contains(const AtomicStringImpl& id) const
{
    return m_map.contains(&id);
}

inline bool DocumentOrderedMap::containsMultiple(const AtomicStringImpl& id) const
{
    auto it = m_map.find(&id);
    return it != m_map.end() && it->value.count > 1;
}

} // namespace WebCore

#endif // DocumentOrderedMap_h