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#ifndef KML_CONVENIENCE_ELEMENT_COUNTER_H__
#define KML_CONVENIENCE_ELEMENT_COUNTER_H__

#include <map>
#include "kml/dom.h"

namespace kmlconvenience {

// This map is used to hold the occurrence count for each element.
typedef std::map<kmldom::KmlDomType, int> ElementCountMap;

// This ParserObserver uses the NewElement() method to count the number of
// ocurrences of each element.
class ElementCounter : public kmldom::ParserObserver {
 public:
  ElementCounter(ElementCountMap* element_count_map)
    : element_count_map_(*element_count_map) {
  }

  // ParserObserver::NewElement()
  virtual bool NewElement(const kmldom::ElementPtr& element) {
    if (element_count_map_.find(element->Type()) == element_count_map_.end()) {
      element_count_map_[element->Type()] = 1;
    } else {
      element_count_map_[element->Type()] += 1;
    }
    return true;  // Always return true to keep parsing.
  }

 private:
  ElementCountMap& element_count_map_;
};

}  // end namespace kmlconvenience

#endif // KML_CONVENIENCE_ELEMENT_COUNTER_H__