104 lines
2.8 KiB
C++
104 lines
2.8 KiB
C++
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/* 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: datasource.hpp 43 2005-04-22 18:52:47Z pavlenko $
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#ifndef DATASOURCE_HPP
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#define DATASOURCE_HPP
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#include <map>
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#include <string>
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#include "ptr.hpp"
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#include "ctrans.hpp"
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#include "params.hpp"
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#include "feature.hpp"
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#include "query.hpp"
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#include "feature_layer_desc.hpp"
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namespace mapnik
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{
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typedef ref_ptr<Feature> feature_ptr;
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struct Featureset
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{
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virtual Feature* next()=0;
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virtual ~Featureset() {};
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};
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typedef ref_ptr<Featureset> featureset_ptr;
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class datasource_exception : public std::exception
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{
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private:
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const std::string message_;
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public:
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datasource_exception(const std::string& message=std::string())
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:message_(message) {}
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~datasource_exception() throw() {}
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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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};
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class datasource
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{
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public:
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enum {
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Vector,
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Raster
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};
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virtual int type() const=0;
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virtual featureset_ptr features(const query& q) const=0;
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virtual Envelope<double> const& envelope() const=0;
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virtual layer_descriptor const& get_descriptor() const=0;
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virtual ~datasource() {};
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};
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typedef std::string datasource_name();
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typedef datasource* create_ds(const Parameters& params);
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typedef void destroy_ds(datasource *ds);
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template <typename DATASOURCE>
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struct datasource_delete
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{
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static void destroy(DATASOURCE* ds)
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{
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destroy_ds(ds);
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}
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};
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typedef ref_ptr<datasource,datasource_delete> datasource_p;
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///////////////////////////////////////////
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#define DATASOURCE_PLUGIN(classname) \
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extern "C" std::string datasource_name() \
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{ \
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return classname::name();\
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}\
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extern "C" datasource* create(const Parameters ¶ms) \
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{ \
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return new classname(params);\
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}\
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extern "C" 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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}
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#endif //DATASOURCE_HPP
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