Source/core/dom/DocumentOrderedMap.h

/*
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 *
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 * 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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 */

#ifndef DocumentOrderedMap_h
#define DocumentOrderedMap_h

#include "wtf/Forward.h"
#include "wtf/HashMap.h"
#include "wtf/text/StringImpl.h"

namespace WebCore {

class Element;
class TreeScope;

class DocumentOrderedMap {
public:
    void add(StringImpl*, Element*);
    void remove(StringImpl*, Element*);

    bool contains(StringImpl*) const;
    bool containsMultiple(StringImpl*) const;
    // concrete instantiations of the get<>() method template
    Element* getElementById(StringImpl*, const TreeScope*) const;
    const Vector<Element*>& getAllElementsById(StringImpl*, const TreeScope*) const;
    Element* getElementByMapName(StringImpl*, const TreeScope*) const;
    Element* getElementByLowercasedMapName(StringImpl*, const TreeScope*) const;
    Element* getElementByLabelForAttribute(StringImpl*, const TreeScope*) const;

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

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

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

    typedef HashMap<StringImpl*, OwnPtr<MapEntry> > Map;

    mutable Map m_map;
};

inline bool DocumentOrderedMap::contains(StringImpl* id) const
{
    return m_map.contains(id);
}

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

} // namespace WebCore

#endif // DocumentOrderedMap_h