239 lines
7.5 KiB
C++
239 lines
7.5 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) 2012 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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#include "geojson_datasource.hpp"
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#include "geojson_featureset.hpp"
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#include <fstream>
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#include <algorithm>
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// boost
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#include <boost/variant.hpp>
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#include <boost/make_shared.hpp>
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#include <boost/algorithm/string.hpp>
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#include <boost/spirit/include/support_multi_pass.hpp>
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#include <boost/foreach.hpp>
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#include <boost/geometry/geometries/box.hpp>
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#include <boost/geometry/geometries/geometries.hpp>
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#include <boost/geometry.hpp>
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#include <boost/geometry/extensions/index/rtree/rtree.hpp>
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// mapnik
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#include <mapnik/unicode.hpp>
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#include <mapnik/utils.hpp>
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#include <mapnik/feature.hpp>
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#include <mapnik/feature_kv_iterator.hpp>
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#include <mapnik/value_types.hpp>
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#include <mapnik/box2d.hpp>
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#include <mapnik/debug.hpp>
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#include <mapnik/proj_transform.hpp>
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#include <mapnik/projection.hpp>
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#include <mapnik/util/geometry_to_ds_type.hpp>
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#include <mapnik/json/feature_collection_parser.hpp>
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#include <mapnik/json/generic_json.hpp>
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using mapnik::datasource;
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using mapnik::parameters;
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DATASOURCE_PLUGIN(geojson_datasource)
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struct attr_value_converter : public boost::static_visitor<mapnik::eAttributeType>
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{
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mapnik::eAttributeType operator() (mapnik::value_integer /*val*/) const
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{
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return mapnik::Integer;
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}
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mapnik::eAttributeType operator() (double /*val*/) const
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{
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return mapnik::Double;
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}
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mapnik::eAttributeType operator() (float /*val*/) const
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{
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return mapnik::Double;
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}
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mapnik::eAttributeType operator() (bool /*val*/) const
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{
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return mapnik::Boolean;
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}
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mapnik::eAttributeType operator() (std::string const& /*val*/) const
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{
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return mapnik::String;
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}
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mapnik::eAttributeType operator() (mapnik::value_unicode_string const& /*val*/) const
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{
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return mapnik::String;
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}
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mapnik::eAttributeType operator() (mapnik::value_null const& /*val*/) const
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{
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return mapnik::String;
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}
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};
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geojson_datasource::geojson_datasource(parameters const& params)
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: datasource(params),
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type_(datasource::Vector),
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desc_(*params.get<std::string>("type"),
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*params.get<std::string>("encoding","utf-8")),
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file_(*params.get<std::string>("file","")),
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extent_(),
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tr_(new mapnik::transcoder(*params.get<std::string>("encoding","utf-8"))),
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features_(),
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tree_(16,1)
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{
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if (file_.empty()) throw mapnik::datasource_exception("GeoJSON Plugin: missing <file> parameter");
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boost::optional<std::string> base = params.get<std::string>("base");
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if (base)
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{
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file_ = *base + "/" + file_;
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}
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typedef std::istreambuf_iterator<char> base_iterator_type;
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#if defined (_WINDOWS)
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std::ifstream is(mapnik::utf8_to_utf16(file_),std::ios_base::in | std::ios_base::binary);
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#else
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std::ifstream is(file_.c_str(),std::ios_base::in | std::ios_base::binary);
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#endif
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if (!is.is_open())
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{
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throw mapnik::datasource_exception("GeoJSON Plugin: could not open: '" + file_ + "'");
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}
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boost::spirit::multi_pass<base_iterator_type> begin =
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boost::spirit::make_default_multi_pass(base_iterator_type(is));
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boost::spirit::multi_pass<base_iterator_type> end =
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boost::spirit::make_default_multi_pass(base_iterator_type());
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mapnik::context_ptr ctx = boost::make_shared<mapnik::context_type>();
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mapnik::json::generic_json<boost::spirit::multi_pass<base_iterator_type> > json;
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mapnik::json::feature_collection_parser<boost::spirit::multi_pass<base_iterator_type> > p(json, ctx,*tr_);
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bool result = p.parse(begin,end, features_);
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if (!result)
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{
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throw mapnik::datasource_exception("geojson_datasource: Failed parse GeoJSON file '" + file_ + "'");
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}
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bool first = true;
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std::size_t count=0;
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BOOST_FOREACH (mapnik::feature_ptr const& f, features_)
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{
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mapnik::box2d<double> box = f->envelope();
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if (first)
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{
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extent_ = box;
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first = false;
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mapnik::feature_kv_iterator f_itr = f->begin();
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mapnik::feature_kv_iterator f_end = f->end();
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for ( ;f_itr!=f_end; ++f_itr)
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{
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desc_.add_descriptor(mapnik::attribute_descriptor(boost::get<0>(*f_itr),
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boost::apply_visitor(attr_value_converter(),boost::get<1>(*f_itr).base())));
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}
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}
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else
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{
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extent_.expand_to_include(box);
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}
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tree_.insert(box_type(point_type(box.minx(),box.miny()),point_type(box.maxx(),box.maxy())), count++);
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}
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}
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geojson_datasource::~geojson_datasource() { }
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const char * geojson_datasource::name()
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{
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return "geojson";
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}
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boost::optional<mapnik::datasource::geometry_t> geojson_datasource::get_geometry_type() const
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{
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boost::optional<mapnik::datasource::geometry_t> result;
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int multi_type = 0;
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unsigned num_features = features_.size();
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for (unsigned i = 0; i < num_features && i < 5; ++i)
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{
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mapnik::util::to_ds_type(features_[i]->paths(),result);
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if (result)
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{
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int type = static_cast<int>(*result);
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if (multi_type > 0 && multi_type != type)
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{
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result.reset(mapnik::datasource::Collection);
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return result;
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}
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multi_type = type;
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}
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}
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return result;
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}
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mapnik::datasource::datasource_t geojson_datasource::type() const
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{
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return type_;
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}
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mapnik::box2d<double> geojson_datasource::envelope() const
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{
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return extent_;
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}
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mapnik::layer_descriptor geojson_datasource::get_descriptor() const
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{
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return desc_;
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}
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mapnik::featureset_ptr geojson_datasource::features(mapnik::query const& q) const
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{
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// if the query box intersects our world extent then query for features
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mapnik::box2d<double> const& b = q.get_bbox();
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if (extent_.intersects(b))
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{
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box_type box(point_type(b.minx(),b.miny()),point_type(b.maxx(),b.maxy()));
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index_array_ = tree_.find(box);
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return boost::make_shared<geojson_featureset>(features_, index_array_.begin(), index_array_.end());
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}
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// otherwise return an empty featureset pointer
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return mapnik::featureset_ptr();
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}
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mapnik::featureset_ptr geojson_datasource::features_at_point(mapnik::coord2d const& pt, double tol) const
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{
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mapnik::box2d<double> query_bbox(pt, pt);
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query_bbox.pad(tol);
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mapnik::query q(query_bbox);
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std::vector<mapnik::attribute_descriptor> const& desc = desc_.get_descriptors();
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std::vector<mapnik::attribute_descriptor>::const_iterator itr = desc.begin();
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std::vector<mapnik::attribute_descriptor>::const_iterator end = desc.end();
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for ( ;itr!=end;++itr)
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{
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q.add_property_name(itr->get_name());
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}
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return features(q);
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}
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