/usr/include/kml/engine/object_id_parser_observer.h is in libkml-dev 1.3.0-5.
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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:
//
// 1. Redistributions of source code must retain the above copyright notice,
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// used to endorse or promote products derived from this software without
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// This file contains the definition of the ObjectIdParserObserver class.
#ifndef KML_ENGINE_OBJECT_ID_PARSER_OBSERVER_H__
#define KML_ENGINE_OBJECT_ID_PARSER_OBSERVER_H__
#include <map>
#include <string>
#include "kml/dom.h"
#include "kml/dom/parser_observer.h"
#include "kml/engine/engine_types.h"
namespace kmlengine {
// The ObjectIdParserObserver is a kmldom::ParserObserver which gathers all
// all Objects with id's into the given map. An Object whose id is already
// in the map causes NewElement() to return false if strict parsing is enabled.
// Duplicate id attributes are illegal and _should_ cause the parse to fail.
// However, Google Earth never enforced this in its KML ingest and thus the
// web has a lot of invalid KML. Clients who want to successfully parse unknown
// KML from the wider web should attempt to parse this by default.
class ObjectIdParserObserver : public kmldom::ParserObserver {
public:
ObjectIdParserObserver(ObjectIdMap* object_id_map, bool strict_parsing)
: object_id_map_(object_id_map),
strict_parse_(strict_parsing) {} // TODO: NULL check, or use reference
virtual ~ObjectIdParserObserver() {}
// This is ParserObserver::NewElement(). If the Element is an Object with an
// id and a mapping for this id already exists and strict parsing has been
// enabled, return false. Else add this id to Object mapping to the
// object_id_map and return true.
virtual bool NewElement(const kmldom::ElementPtr& element) {
if (kmldom::ObjectPtr object = kmldom::AsObject(element)) {
if (object->has_id()) {
if (object_id_map_->find(object->get_id()) != object_id_map_->end()
&& strict_parse_) {
// TODO: create an error message
return false; // Duplicate id, fail parse.
}
(*object_id_map_)[object->get_id()] = object; // Last one wins.
}
}
// Not a duplicate id, or strict parsing not enabled, keep parsing.
return true;
}
// The default implementation of Parser::AddChild() is essentially a nop.
private:
// An ObjectIdParserObserver only exists for a short time and operates
// on a persistent ObjectIdMap.
ObjectIdMap* object_id_map_;
bool strict_parse_;
};
} // end namespace kmlengine
#endif // KML_ENGINE_OBJECT_ID_PARSER_OBSERVER_H__
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