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C++ API DOCUMENTATION |
00001 /***************************************************************************** 00002 * 00003 * This file is part of Mapnik (c++ mapping toolkit) 00004 * 00005 * Copyright (C) 2006 Artem Pavlenko 00006 * 00007 * This library is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * This library is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with this library; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00020 * 00021 *****************************************************************************/ 00022 00023 //$Id$ 00024 00025 #ifndef FILTER_VISITOR_HPP 00026 #define FILTER_VISITOR_HPP 00027 00028 #include <mapnik/filter.hpp> 00029 #include <mapnik/expression.hpp> 00030 00031 namespace mapnik 00032 { 00033 template <typename FeatureT> class filter; 00034 template <typename FeatureT> class expression; 00035 template <typename FeatureT> class expression; 00036 template <typename Feature,template <typename> class Filter> class rule; 00037 template <typename FeatureT> 00038 class filter_visitor 00039 { 00040 public: 00041 virtual void visit(filter<FeatureT>& filter)=0; 00042 virtual void visit(expression<FeatureT>&)=0; 00043 virtual void visit(rule<FeatureT,filter> const& r)=0; 00044 virtual ~filter_visitor() {} 00045 }; 00046 } 00047 00048 #endif //FILTER_VISITOR_HPP