/home/andreas/src/svn/mapnik/include/mapnik/rule.hpp

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/*****************************************************************************
 * 
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2006 Artem Pavlenko
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/

#ifndef RULE_HPP
#define RULE_HPP
// stl
#include <string>
#include <vector>
// boost
#include <boost/shared_ptr.hpp>
#include <boost/variant.hpp>
// mapnik
#include <mapnik/line_symbolizer.hpp>
#include <mapnik/line_pattern_symbolizer.hpp>
#include <mapnik/polygon_symbolizer.hpp>
#include <mapnik/polygon_pattern_symbolizer.hpp>
#include <mapnik/point_symbolizer.hpp>
#include <mapnik/raster_symbolizer.hpp>
#include <mapnik/shield_symbolizer.hpp>
#include <mapnik/text_symbolizer.hpp>
#include <mapnik/filter.hpp>
#include <mapnik/filter_visitor.hpp>

namespace mapnik
{
    inline bool operator==(point_symbolizer const& lhs,
                           point_symbolizer const& rhs)
    {
        return (&lhs == &rhs); 
    }
    inline bool operator==(line_symbolizer const& lhs,
                           line_symbolizer const& rhs)
    {
        return (&lhs == &rhs); 
    }
    inline bool operator==(line_pattern_symbolizer const& lhs,
                           line_pattern_symbolizer const& rhs)
    {
        return (&lhs == &rhs); 
    }

    inline bool operator==(polygon_symbolizer const& lhs,
                           polygon_symbolizer const& rhs)
    {
        return (&lhs == &rhs); 
    }
    
    inline bool operator==(polygon_pattern_symbolizer const& lhs,
                           polygon_pattern_symbolizer const& rhs)
    {
        return (&lhs == &rhs); 
    }
    
    inline bool operator==(raster_symbolizer const& lhs,
                           raster_symbolizer const& rhs)
    {
        return (&lhs == &rhs); 
    }
    
    inline bool operator==(text_symbolizer const& lhs,
                           text_symbolizer const& rhs)
    {
        return (&lhs == &rhs); 
    }
    
    inline bool operator==(shield_symbolizer const& lhs,
                           shield_symbolizer const& rhs)
    {
        return (&lhs == &rhs); 
    }
    
    typedef boost::variant<point_symbolizer,
                           line_symbolizer,
                           line_pattern_symbolizer,
                           polygon_symbolizer,
                           polygon_pattern_symbolizer,
                           raster_symbolizer,
                           shield_symbolizer,
                           text_symbolizer> symbolizer;
    
        
    typedef std::vector<symbolizer> symbolizers;
    
    template <typename FeatureT> class all_filter;

    template <typename FeatureT,template <typename> class Filter>
    class rule
    {
        typedef Filter<FeatureT> filter_type;
        typedef boost::shared_ptr<filter_type> filter_ptr;
    private:

        std::string name_;
        std::string title_;
        std::string abstract_;
        double min_scale_;
        double max_scale_;
        symbolizers syms_;
        filter_ptr filter_;
        bool else_filter_;
    public:
        rule()
            : name_(),
              title_(),
              abstract_(),
              min_scale_(0),
              max_scale_(std::numeric_limits<double>::infinity()),
              syms_(),
              filter_(new all_filter<FeatureT>),
              else_filter_(false) {}
                
        rule(const std::string& name,
             const std::string& title="",
             double min_scale_denominator=0,
             double max_scale_denominator=std::numeric_limits<double>::infinity())
            : name_(name),
              title_(title),
              min_scale_(min_scale_denominator),
              max_scale_(max_scale_denominator),
              syms_(),
              filter_(new all_filter<FeatureT>),
              else_filter_(false) {}
            
        rule(const rule& rhs)    
            : name_(rhs.name_),
              title_(rhs.title_),
              abstract_(rhs.abstract_),
              min_scale_(rhs.min_scale_),
              max_scale_(rhs.max_scale_),
              syms_(rhs.syms_),
              filter_(rhs.filter_),
              else_filter_(rhs.else_filter_) {}
        
        rule& operator=(rule const& rhs) 
        {
            rule tmp(rhs);
            swap(tmp);
            return *this;
        }
        bool operator==(rule const& other)
        {
            return  (this == &other); 
        }
        
        void set_max_scale(double scale)
        {
            max_scale_=scale;
        }
        
        double get_max_scale() const
        {
            return max_scale_;
        }
        
        void set_min_scale(double scale)
        {
            min_scale_=scale;
        }

        double get_min_scale() const
        {
            return min_scale_;
        }

       
        void set_name(std::string const& name)
        {
            name_=name;
        }
        
        std::string const& get_name() const
        {
            return name_;
        }
        
        std::string const& get_title() const
        {
            return  title_;
        }

        void set_title(std::string const& title)
        {
            title_=title;
        }
  
        void set_abstract(std::string const& abstract)
        {
            abstract_=abstract;
        }
        
        std::string const& get_abstract() const
        {
            return abstract_;
        }
                
        void append(const symbolizer& sym)
        {
            syms_.push_back(sym);
        }
        
        void remove_at(size_t index)
        {
            if (index < syms_.size())
            {
                syms_.erase(syms_.begin()+index);
            }
        }
        
        const symbolizers& get_symbolizers() const
        {
            return syms_;
        }
        
        symbolizers::const_iterator begin()
        {
            return syms_.begin();
        }
        
        symbolizers::const_iterator end()
        {
            return syms_.end();
        }
        
        void set_filter(const filter_ptr& filter)
        {
            filter_=filter;
        }

        filter_ptr const& get_filter() const
        {
            return filter_;
        }
        
        void set_else(bool else_filter)
        {
            else_filter_=else_filter;
        }
     
        bool has_else_filter() const
        {
            return else_filter_;
        }
        
        bool active(double scale) const
        {
            return ( scale >= min_scale_ - 1e-6 && scale < max_scale_ + 1e-6);
        }

        void accept(filter_visitor<FeatureT>& v) const
        {
            v.visit(*this);
        }
        
    private:
        
        void swap(rule& rhs) throw()
        {
            name_=rhs.name_;
            title_=rhs.title_;
            abstract_=rhs.abstract_;
            min_scale_=rhs.min_scale_;
            max_scale_=rhs.max_scale_;
            syms_=rhs.syms_;
            filter_=rhs.filter_;
            else_filter_=rhs.else_filter_;
        }
    };

    typedef rule<Feature,filter> rule_type;
}

#endif //RULE_HPP

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