78 lines
1.7 KiB
C++
78 lines
1.7 KiB
C++
/* This file is part of Mapnik (c++ mapping toolkit)
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* Copyright (C) 2005 Artem Pavlenko
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*
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* Mapnik is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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// $Id$
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#ifndef FILTER_HH
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#define FILTER_HH
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#include "envelope.hh"
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#include "feature.hh"
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#include "filter_visitor.hh"
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namespace mapnik
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{
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typedef ref_ptr<filter<Feature> > filter_ptr;
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template <typename Feature>
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struct filter
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{
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enum {
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NULL_OPS,
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SPATIAL_OPS,
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COMPARISON_OPS,
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LOGICAL_OPS,
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FEATUREID_OPS
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};
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virtual int type() const=0;
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virtual bool pass (const Feature& feature) const = 0;
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virtual filter<Feature>* clone() const = 0;
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virtual void accept(filter_visitor<Feature>& v) = 0;
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virtual ~filter() {}
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};
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template <typename Feature>
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struct null_filter : public filter<Feature>
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{
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typedef filter<Feature> _Base_;
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int type() const
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{
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return _Base_::NULL_OPS;
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}
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bool pass (const Feature&) const
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{
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return true;
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}
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_Base_* clone() const
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{
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return new null_filter<Feature>;
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}
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void accept(filter_visitor<Feature>& v)
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{
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v.visit(*this);
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}
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~null_filter() {}
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};
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}
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#endif //FILTER_HH
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