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85 lines
3.7 KiB
C
85 lines
3.7 KiB
C
2 years ago
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// Copyright 2008, Google Inc. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// 3. Neither the name of Google Inc. nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// This file contains the definition of the ObjectIdParserObserver class.
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#ifndef KML_ENGINE_OBJECT_ID_PARSER_OBSERVER_H__
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#define KML_ENGINE_OBJECT_ID_PARSER_OBSERVER_H__
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#include <map>
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#include <string>
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#include "kml/dom.h"
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#include "kml/dom/parser_observer.h"
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#include "kml/engine/engine_types.h"
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namespace kmlengine {
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// The ObjectIdParserObserver is a kmldom::ParserObserver which gathers all
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// all Objects with id's into the given map. An Object whose id is already
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// in the map causes NewElement() to return false if strict parsing is enabled.
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// Duplicate id attributes are illegal and _should_ cause the parse to fail.
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// However, Google Earth never enforced this in its KML ingest and thus the
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// web has a lot of invalid KML. Clients who want to successfully parse unknown
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// KML from the wider web should attempt to parse this by default.
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class ObjectIdParserObserver : public kmldom::ParserObserver {
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public:
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ObjectIdParserObserver(ObjectIdMap* object_id_map, bool strict_parsing)
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: object_id_map_(object_id_map),
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strict_parse_(strict_parsing) {} // TODO: NULL check, or use reference
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virtual ~ObjectIdParserObserver() {}
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// This is ParserObserver::NewElement(). If the Element is an Object with an
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// id and a mapping for this id already exists and strict parsing has been
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// enabled, return false. Else add this id to Object mapping to the
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// object_id_map and return true.
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virtual bool NewElement(const kmldom::ElementPtr& element) {
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if (kmldom::ObjectPtr object = kmldom::AsObject(element)) {
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if (object->has_id()) {
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if (object_id_map_->find(object->get_id()) != object_id_map_->end()
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&& strict_parse_) {
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// TODO: create an error message
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return false; // Duplicate id, fail parse.
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}
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(*object_id_map_)[object->get_id()] = object; // Last one wins.
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}
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}
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// Not a duplicate id, or strict parsing not enabled, keep parsing.
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return true;
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}
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// The default implementation of Parser::AddChild() is essentially a nop.
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private:
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// An ObjectIdParserObserver only exists for a short time and operates
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// on a persistent ObjectIdMap.
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ObjectIdMap* object_id_map_;
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bool strict_parse_;
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};
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} // end namespace kmlengine
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#endif // KML_ENGINE_OBJECT_ID_PARSER_OBSERVER_H__
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