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69 lines
3.0 KiB
C++
69 lines
3.0 KiB
C++
// 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 defines the ParserObserver base class.
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#ifndef KML_DOM_PARSER_OBSERVER_H__
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#define KML_DOM_PARSER_OBSERVER_H__
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#include "kml/dom/kml_ptr.h"
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namespace kmldom {
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// This class should be derived from to provide SAX-style callbacks during
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// the DOM parse. The derived class can implement one or both of
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// EndElement() and AddChild(). EndElement() is called after the Element
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// has been constructed. AddChild() is called after the given child has
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// been added to the given parent. If the derived class returns false
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// from either EndElement() or AddChild() the parse is immediately terminated.
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class ParserObserver {
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public:
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virtual ~ParserObserver() { // Silence compiler warnings.
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}
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// Called after this element is created by the parser.
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virtual bool NewElement(const ElementPtr& /*element*/ ) {
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return true; // Default implementation is a NOP: parse continues.
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}
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// Called after child is fully constructed before it is added to the parent.
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// A derived class can return false to inhibit adding the child to the parent.
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// Returning true permits the parser to add this child to the parent.
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virtual bool EndElement(const ElementPtr& /*parent*/, const ElementPtr& /*child*/) {
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return true;
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}
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// Called after the given child has been set to the given parent.
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virtual bool AddChild(const ElementPtr& /*parent*/, const ElementPtr& /*child*/) {
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return true; // Default implementation is a NOP: parse continues.
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}
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};
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typedef std::vector<ParserObserver*> parser_observer_vector_t;
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} // end namespace kmldom
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#endif // KML_DOM_PARSER_OBSERVER_H__
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