da983367a8
from datasource (base class) ctor
(FIXME: would be better to use parameters to
pass to specific options to concrete
datasource implementations)
147 lines
4.4 KiB
C++
147 lines
4.4 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: 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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// mapnik
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#include <mapnik/config.hpp>
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#include <mapnik/ctrans.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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// boost
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#include <boost/utility.hpp>
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#include <boost/shared_ptr.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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typedef MAPNIK_DECL boost::shared_ptr<Feature> feature_ptr;
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struct MAPNIK_DECL Featureset
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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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private:
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std::string message_;
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public:
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datasource_exception(const std::string& message=std::string("no reason"))
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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 MAPNIK_DECL datasource : private boost::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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datasource (parameters const& params)
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: params_(params),
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is_bound_(false)
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{}
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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 int type() const=0;
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/*!
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* @brief Connect to the datasource
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*/
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virtual void bind() const {};
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virtual featureset_ptr features(const query& q) const=0;
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virtual featureset_ptr features_at_point(coord2d const& pt) const=0;
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virtual box2d<double> envelope() 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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mutable bool is_bound_;
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};
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typedef std::string datasource_name();
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typedef datasource* create_ds(const parameters& params, bool bind);
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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 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" MAPNIK_EXP datasource* create(const parameters ¶ms, bool bind) \
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{ \
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return new classname(params, bind); \
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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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}
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#endif //DATASOURCE_HPP
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