mapnik/include/regex_filter.hpp

/* This file is part of Mapnik (c++ mapping toolkit)
 * Copyright (C) 2005 Artem Pavlenko
 *
 * Mapnik is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

//$Id$

#ifndef REGEX_FILTER_HPP
#define REGEX_FILTER_HPP

#include "filter.hpp"
#include "expression.hpp"

#include <boost/regex.hpp>
#include <iostream>

namespace mapnik
{ 
    template <typename FeatureT>
    struct regex_filter : public filter<FeatureT>
    {

	regex_filter(expression<FeatureT> const& exp,
		     std::string const& pattern)
	    : filter<FeatureT>(),
	      exp_(exp.clone()),
	      pattern_(pattern) {}
	
	regex_filter(regex_filter const& other)
	    :  filter<FeatureT>(),
	       exp_(other.exp_->clone()),
	       pattern_(other.pattern_) {}
	
	bool pass(FeatureT const& feature) const
	{
	    std::string text=exp_->get_value(feature).to_string();
	    return boost::regex_match(text,pattern_);
	}
	
	void accept(filter_visitor<FeatureT>& v)
	{
	    exp_->accept(v);
	    v.visit(*this);
	}
	
	filter<FeatureT>* clone() const
	{
	    return new regex_filter(*this);
	}
	std::string to_string() const
	{
	    return exp_->to_string()+".match("+pattern_.str()+")";
	}
	~regex_filter()
	{
	    delete exp_;
	}
	
    private:
	expression<FeatureT>* exp_;
	boost::regex pattern_;
	
    };   
}


#endif //REGEX_FILTER_HPP