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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2006 Artem Pavlenko, Jean-Francois Doyon
*
* 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
*
*****************************************************************************/
//$Id$
// boost
#include <boost/python.hpp>
#include <boost/python/detail/api_placeholder.hpp>
// stl
#include <sstream>
// mapnik
#include <mapnik/envelope.hpp>
#include <mapnik/datasource.hpp>
#include <mapnik/datasource_cache.hpp>
#include <mapnik/feature_layer_desc.hpp>
namespace
{
//user-friendly wrapper that uses Python dictionary
using namespace boost::python;
boost::shared_ptr<mapnik::datasource> create_datasource(const dict& d)
{
mapnik::parameters params;
boost::python::list keys=d.keys();
for (int i=0; i<len(keys); ++i)
{
std::string key = extract<std::string>(keys[i]);
object obj = d[key];
extract<std::string> ex0(obj);
extract<int> ex1(obj);
extract<double> ex2(obj);
if (ex0.check())
{
params[key] = ex0();
}
else if (ex1.check())
{
params[key] = ex1();
}
else if (ex2.check())
{
params[key] = ex2();
}
}
return mapnik::datasource_cache::create(params);
}
std::string describe(boost::shared_ptr<mapnik::datasource> const& ds)
{
std::stringstream ss;
if (ds)
{
ss << ds->get_descriptor() << "\n";
}
else
{
ss << "Null\n";
}
return ss.str();
}
}
void export_datasource()
{
using namespace boost::python;
using mapnik::datasource;
class_<datasource,boost::shared_ptr<datasource>,
boost::noncopyable>("Datasource",no_init)
.def("envelope",&datasource::envelope)
.def("descriptor",&datasource::get_descriptor) //todo
.def("features",&datasource::features)
.def("features_at_point",&datasource::features_at_point)
.def("params",&datasource::params,return_value_policy<copy_const_reference>(),
"The configuration parameters of the data source. "
"These vary depending on the type of data source.")
;
def("Describe",&describe);
def("CreateDatasource",&create_datasource);
}
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