148 lines
4.2 KiB
C++
148 lines
4.2 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) 2011 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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#ifndef MAPNIK_DATASOURCE_HPP
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#define MAPNIK_DATASOURCE_HPP
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// mapnik
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#include <mapnik/config.hpp>
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#include <mapnik/params.hpp>
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#include <mapnik/feature.hpp>
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#include <mapnik/query.hpp>
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#include <mapnik/feature_layer_desc.hpp>
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#include <mapnik/noncopyable.hpp>
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// boost
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#include <boost/shared_ptr.hpp>
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#include <boost/optional.hpp>
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// stl
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#include <map>
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#include <string>
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namespace mapnik {
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struct MAPNIK_DECL Featureset : private mapnik::noncopyable
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{
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virtual feature_ptr next() = 0;
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virtual ~Featureset() {}
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};
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typedef MAPNIK_DECL boost::shared_ptr<Featureset> featureset_ptr;
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class MAPNIK_DECL datasource_exception : public std::exception
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{
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public:
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datasource_exception(std::string const& message)
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: message_(message)
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{
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}
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~datasource_exception() throw()
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{
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}
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virtual const char* what() const throw()
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{
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return message_.c_str();
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}
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private:
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std::string message_;
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};
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class MAPNIK_DECL datasource : private mapnik::noncopyable
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{
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public:
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enum datasource_t {
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Vector,
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Raster
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};
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enum geometry_t {
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Point = 1,
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LineString = 2,
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Polygon = 3,
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Collection = 4
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};
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datasource (parameters const& params)
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: params_(params) {}
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/*!
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* @brief Get the configuration parameters of the data source.
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*
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* These vary depending on the type of data source.
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*
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* @return The configuration parameters of the data source.
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*/
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parameters const& params() const
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{
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return params_;
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}
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/*!
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* @brief Get the type of the datasource
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* @return The type of the datasource (Vector or Raster)
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*/
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virtual datasource_t type() const = 0;
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virtual featureset_ptr features(query const& q) const = 0;
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virtual featureset_ptr features_at_point(coord2d const& pt, double tol = 0) const = 0;
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virtual box2d<double> envelope() const = 0;
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virtual boost::optional<geometry_t> get_geometry_type() const = 0;
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virtual layer_descriptor get_descriptor() const = 0;
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virtual ~datasource() {}
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protected:
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parameters params_;
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};
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typedef const char * datasource_name();
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typedef datasource* create_ds(parameters const& params);
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typedef void destroy_ds(datasource *ds);
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class datasource_deleter
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{
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public:
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void operator() (datasource* ds)
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{
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delete ds;
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}
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};
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typedef boost::shared_ptr<datasource> datasource_ptr;
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#define DATASOURCE_PLUGIN(classname) \
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extern "C" MAPNIK_EXP const char * datasource_name() \
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{ \
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return classname::name(); \
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} \
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extern "C" MAPNIK_EXP datasource* create(parameters const& params) \
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{ \
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return new classname(params); \
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} \
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extern "C" MAPNIK_EXP void destroy(datasource *ds) \
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{ \
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delete ds; \
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}
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}
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#endif // MAPNIK_DATASOURCE_HPP
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