98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2006 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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//$Id$
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#ifndef ATTRIBUTE_COLLECTOR_HPP
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#define ATTRIBUTE_COLLECTOR_HPP
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#include "filter.hpp"
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#include "expression.hpp"
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#include "feature_layer_desc.hpp"
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#include "rule.hpp"
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#include <set>
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#include <iostream>
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namespace mapnik
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{
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struct symbolizer_attributes : public boost::static_visitor<>
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{
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symbolizer_attributes(std::set<std::string>& names)
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: names_(names) {}
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template <typename T>
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void operator () (T const&) const {}
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void operator () (text_symbolizer const& sym)
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{
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names_.insert(sym.get_name());
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}
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private:
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std::set<std::string>& names_;
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};
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template <typename FeatureT>
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class attribute_collector : public filter_visitor<FeatureT>
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{
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private:
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std::set<std::string>& names_;
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public:
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attribute_collector(std::set<std::string>& names)
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: names_(names) {}
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void visit(filter<FeatureT>& /*filter*/)
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{
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//not interested
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}
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void visit(expression<FeatureT>& exp)
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{
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property<FeatureT>* pf;
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if ((pf = dynamic_cast<property<FeatureT>*>(&exp)))
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{
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names_.insert(pf->name());
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}
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}
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void visit(rule_type const& r)
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{
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const symbolizers& symbols = r.get_symbolizers();
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symbolizers::const_iterator symIter=symbols.begin();
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symbolizer_attributes attr(names_);
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while (symIter != symbols.end())
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{
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boost::apply_visitor(attr,*symIter++);
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}
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filter_ptr const& filter = r.get_filter();
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filter->accept(*this);
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}
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virtual ~attribute_collector() {}
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private:
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// no copying
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attribute_collector(attribute_collector const&);
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attribute_collector& operator=(attribute_collector const&);
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};
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}
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#endif //ATTRIBUTE_COLLECTOR_HPP
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