237 lines
7.4 KiB
C++
237 lines
7.4 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2012 Artem Pavlenko
|
|
*
|
|
* 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
|
|
*
|
|
*****************************************************************************/
|
|
|
|
#include "geojson_datasource.hpp"
|
|
#include "geojson_featureset.hpp"
|
|
|
|
#include <fstream>
|
|
#include <algorithm>
|
|
|
|
// boost
|
|
#include <boost/variant.hpp>
|
|
#include <boost/make_shared.hpp>
|
|
#include <boost/algorithm/string.hpp>
|
|
#include <boost/spirit/include/support_multi_pass.hpp>
|
|
#include <boost/foreach.hpp>
|
|
#include <boost/geometry/geometries/box.hpp>
|
|
#include <boost/geometry/geometries/geometries.hpp>
|
|
#include <boost/geometry.hpp>
|
|
#include <boost/geometry/extensions/index/rtree/rtree.hpp>
|
|
|
|
// mapnik
|
|
#include <mapnik/unicode.hpp>
|
|
#include <mapnik/utils.hpp>
|
|
#include <mapnik/feature.hpp>
|
|
#include <mapnik/feature_kv_iterator.hpp>
|
|
#include <mapnik/value_types.hpp>
|
|
#include <mapnik/box2d.hpp>
|
|
#include <mapnik/debug.hpp>
|
|
#include <mapnik/proj_transform.hpp>
|
|
#include <mapnik/projection.hpp>
|
|
#include <mapnik/util/geometry_to_ds_type.hpp>
|
|
#include <mapnik/json/feature_collection_parser.hpp>
|
|
|
|
using mapnik::datasource;
|
|
using mapnik::parameters;
|
|
|
|
DATASOURCE_PLUGIN(geojson_datasource)
|
|
|
|
struct attr_value_converter : public boost::static_visitor<mapnik::eAttributeType>
|
|
{
|
|
mapnik::eAttributeType operator() (mapnik::value_integer /*val*/) const
|
|
{
|
|
return mapnik::Integer;
|
|
}
|
|
|
|
mapnik::eAttributeType operator() (double /*val*/) const
|
|
{
|
|
return mapnik::Double;
|
|
}
|
|
|
|
mapnik::eAttributeType operator() (float /*val*/) const
|
|
{
|
|
return mapnik::Double;
|
|
}
|
|
|
|
mapnik::eAttributeType operator() (bool /*val*/) const
|
|
{
|
|
return mapnik::Boolean;
|
|
}
|
|
|
|
mapnik::eAttributeType operator() (std::string const& /*val*/) const
|
|
{
|
|
return mapnik::String;
|
|
}
|
|
|
|
mapnik::eAttributeType operator() (mapnik::value_unicode_string const& /*val*/) const
|
|
{
|
|
return mapnik::String;
|
|
}
|
|
|
|
mapnik::eAttributeType operator() (mapnik::value_null const& /*val*/) const
|
|
{
|
|
return mapnik::String;
|
|
}
|
|
};
|
|
|
|
geojson_datasource::geojson_datasource(parameters const& params)
|
|
: datasource(params),
|
|
type_(datasource::Vector),
|
|
desc_(*params.get<std::string>("type"),
|
|
*params.get<std::string>("encoding","utf-8")),
|
|
file_(*params.get<std::string>("file","")),
|
|
extent_(),
|
|
tr_(new mapnik::transcoder(*params.get<std::string>("encoding","utf-8"))),
|
|
features_(),
|
|
tree_(16,1)
|
|
{
|
|
if (file_.empty()) throw mapnik::datasource_exception("GeoJSON Plugin: missing <file> parameter");
|
|
|
|
boost::optional<std::string> base = params.get<std::string>("base");
|
|
if (base)
|
|
{
|
|
file_ = *base + "/" + file_;
|
|
}
|
|
|
|
typedef std::istreambuf_iterator<char> base_iterator_type;
|
|
|
|
#if defined (_WINDOWS)
|
|
std::ifstream is(mapnik::utf8_to_utf16(file_),std::ios_base::in | std::ios_base::binary);
|
|
#else
|
|
std::ifstream is(file_.c_str(),std::ios_base::in | std::ios_base::binary);
|
|
#endif
|
|
if (!is.is_open())
|
|
{
|
|
throw mapnik::datasource_exception("GeoJSON Plugin: could not open: '" + file_ + "'");
|
|
}
|
|
|
|
boost::spirit::multi_pass<base_iterator_type> begin =
|
|
boost::spirit::make_default_multi_pass(base_iterator_type(is));
|
|
|
|
boost::spirit::multi_pass<base_iterator_type> end =
|
|
boost::spirit::make_default_multi_pass(base_iterator_type());
|
|
|
|
mapnik::context_ptr ctx = boost::make_shared<mapnik::context_type>();
|
|
mapnik::json::feature_collection_parser<boost::spirit::multi_pass<base_iterator_type> > p(ctx,*tr_);
|
|
bool result = p.parse(begin,end, features_);
|
|
if (!result)
|
|
{
|
|
throw mapnik::datasource_exception("geojson_datasource: Failed parse GeoJSON file '" + file_ + "'");
|
|
}
|
|
|
|
bool first = true;
|
|
std::size_t count=0;
|
|
BOOST_FOREACH (mapnik::feature_ptr const& f, features_)
|
|
{
|
|
mapnik::box2d<double> box = f->envelope();
|
|
if (first)
|
|
{
|
|
extent_ = box;
|
|
first = false;
|
|
mapnik::feature_kv_iterator f_itr = f->begin();
|
|
mapnik::feature_kv_iterator f_end = f->end();
|
|
for ( ;f_itr!=f_end; ++f_itr)
|
|
{
|
|
desc_.add_descriptor(mapnik::attribute_descriptor(boost::get<0>(*f_itr),
|
|
boost::apply_visitor(attr_value_converter(),boost::get<1>(*f_itr).base())));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
extent_.expand_to_include(box);
|
|
}
|
|
tree_.insert(box_type(point_type(box.minx(),box.miny()),point_type(box.maxx(),box.maxy())), count++);
|
|
}
|
|
}
|
|
|
|
geojson_datasource::~geojson_datasource() { }
|
|
|
|
const char * geojson_datasource::name()
|
|
{
|
|
return "geojson";
|
|
}
|
|
|
|
boost::optional<mapnik::datasource::geometry_t> geojson_datasource::get_geometry_type() const
|
|
{
|
|
boost::optional<mapnik::datasource::geometry_t> result;
|
|
int multi_type = 0;
|
|
unsigned num_features = features_.size();
|
|
for (unsigned i = 0; i < num_features && i < 5; ++i)
|
|
{
|
|
mapnik::util::to_ds_type(features_[i]->paths(),result);
|
|
if (result)
|
|
{
|
|
int type = static_cast<int>(*result);
|
|
if (multi_type > 0 && multi_type != type)
|
|
{
|
|
result.reset(mapnik::datasource::Collection);
|
|
return result;
|
|
}
|
|
multi_type = type;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
mapnik::datasource::datasource_t geojson_datasource::type() const
|
|
{
|
|
return type_;
|
|
}
|
|
|
|
mapnik::box2d<double> geojson_datasource::envelope() const
|
|
{
|
|
return extent_;
|
|
}
|
|
|
|
mapnik::layer_descriptor geojson_datasource::get_descriptor() const
|
|
{
|
|
return desc_;
|
|
}
|
|
|
|
mapnik::featureset_ptr geojson_datasource::features(mapnik::query const& q) const
|
|
{
|
|
// if the query box intersects our world extent then query for features
|
|
mapnik::box2d<double> const& b = q.get_bbox();
|
|
if (extent_.intersects(b))
|
|
{
|
|
box_type box(point_type(b.minx(),b.miny()),point_type(b.maxx(),b.maxy()));
|
|
index_array_ = tree_.find(box);
|
|
return boost::make_shared<geojson_featureset>(features_, index_array_.begin(), index_array_.end());
|
|
}
|
|
// otherwise return an empty featureset pointer
|
|
return mapnik::featureset_ptr();
|
|
}
|
|
|
|
mapnik::featureset_ptr geojson_datasource::features_at_point(mapnik::coord2d const& pt, double tol) const
|
|
{
|
|
mapnik::box2d<double> query_bbox(pt, pt);
|
|
query_bbox.pad(tol);
|
|
mapnik::query q(query_bbox);
|
|
std::vector<mapnik::attribute_descriptor> const& desc = desc_.get_descriptors();
|
|
std::vector<mapnik::attribute_descriptor>::const_iterator itr = desc.begin();
|
|
std::vector<mapnik::attribute_descriptor>::const_iterator end = desc.end();
|
|
for ( ;itr!=end;++itr)
|
|
{
|
|
q.add_property_name(itr->get_name());
|
|
}
|
|
return features(q);
|
|
}
|