185 lines
6.7 KiB
C++
185 lines
6.7 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) 2016 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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// stl
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#include <fstream>
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// mapnik
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#include <mapnik/debug.hpp>
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#include <mapnik/feature_factory.hpp>
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#pragma GCC diagnostic push
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#include <mapnik/warning_ignore.hpp>
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#include <boost/algorithm/string.hpp>
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#if defined(MAPNIK_MEMORY_MAPPED_FILE)
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#include <boost/interprocess/streams/bufferstream.hpp>
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#endif
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#pragma GCC diagnostic pop
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#include "shape_index_featureset.hpp"
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#include "shape_utils.hpp"
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#include <mapnik/util/spatial_index.hpp>
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using mapnik::feature_factory;
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template <typename filterT>
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shape_index_featureset<filterT>::shape_index_featureset(filterT const& filter,
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std::unique_ptr<shape_io> && shape_ptr,
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std::set<std::string> const& attribute_names,
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std::string const& encoding,
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std::string const& shape_name,
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int row_limit)
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: filter_(filter),
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ctx_(std::make_shared<mapnik::context_type>()),
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shape_ptr_(std::move(shape_ptr)),
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tr_(new mapnik::transcoder(encoding)),
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offsets_(),
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itr_(),
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attr_ids_(),
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row_limit_(row_limit),
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count_(0),
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feature_bbox_()
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{
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shape_ptr_->shp().skip(100);
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setup_attributes(ctx_, attribute_names, shape_name, *shape_ptr_,attr_ids_);
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auto index = shape_ptr_->index();
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if (index)
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{
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#if defined(MAPNIK_MEMORY_MAPPED_FILE)
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mapnik::util::spatial_index<mapnik::detail::node, filterT,boost::interprocess::ibufferstream>::query(filter, index->file(), offsets_);
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#else
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mapnik::util::spatial_index<mapnik::detail::node, filterT, std::ifstream>::query(filter, index->file(), offsets_);
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#endif
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}
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std::sort(offsets_.begin(), offsets_.end(), [](mapnik::detail::node const& n0, mapnik::detail::node const& n1)
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{return n0.offset != n1.offset ? n0.offset < n1.offset : n0.start < n1.start;});
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MAPNIK_LOG_DEBUG(shape) << "shape_index_featureset: Query size=" << offsets_.size();
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itr_ = offsets_.begin();
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}
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template <typename filterT>
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feature_ptr shape_index_featureset<filterT>::next()
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{
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if (row_limit_ && count_ >= row_limit_)
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{
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return feature_ptr();
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}
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while ( itr_ != offsets_.end())
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{
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int offset = itr_->offset;
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shape_ptr_->move_to(offset);
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std::vector<std::pair<int,int>> parts;
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while (itr_ != offsets_.end() && itr_->offset == offset)
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{
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if (itr_->start!= -1) parts.emplace_back(itr_->start, itr_->end);
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++itr_;
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}
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mapnik::value_integer feature_id = shape_ptr_->id();
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shape_file::record_type record(shape_ptr_->reclength_ * 2);
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shape_ptr_->shp().read_record(record);
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int type = record.read_ndr_integer();
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feature_ptr feature(feature_factory::create(ctx_, feature_id));
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switch (type)
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{
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case shape_io::shape_point:
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case shape_io::shape_pointm:
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case shape_io::shape_pointz:
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{
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double x = record.read_double();
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double y = record.read_double();
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feature->set_geometry(mapnik::geometry::point<double>(x,y));
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break;
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}
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case shape_io::shape_multipoint:
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case shape_io::shape_multipointm:
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case shape_io::shape_multipointz:
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{
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shape_io::read_bbox(record, feature_bbox_);
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if (!filter_.pass(feature_bbox_)) continue;
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int num_points = record.read_ndr_integer();
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mapnik::geometry::multi_point<double> multi_point;
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for (int i = 0; i < num_points; ++i)
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{
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double x = record.read_double();
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double y = record.read_double();
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multi_point.emplace_back(mapnik::geometry::point<double>(x, y));
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}
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feature->set_geometry(std::move(multi_point));
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break;
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}
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case shape_io::shape_polyline:
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case shape_io::shape_polylinem:
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case shape_io::shape_polylinez:
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{
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shape_io::read_bbox(record, feature_bbox_);
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if (!filter_.pass(feature_bbox_)) continue;
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if (parts.size() < 2) feature->set_geometry(shape_io::read_polyline(record));
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else feature->set_geometry(shape_io::read_polyline_parts(record, parts));
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break;
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}
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case shape_io::shape_polygon:
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case shape_io::shape_polygonm:
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case shape_io::shape_polygonz:
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{
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shape_io::read_bbox(record, feature_bbox_);
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if (!filter_.pass(feature_bbox_)) continue;
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if (parts.size() < 2) feature->set_geometry(shape_io::read_polygon(record));
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else feature->set_geometry(shape_io::read_polygon_parts(record, parts));
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break;
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}
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default :
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MAPNIK_LOG_DEBUG(shape) << "shape_index_featureset: Unsupported type" << type;
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return feature_ptr();
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}
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if (attr_ids_.size())
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{
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shape_ptr_->dbf().move_to(shape_ptr_->id_);
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try
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{
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for (auto id : attr_ids_)
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{
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shape_ptr_->dbf().add_attribute(id, *tr_, *feature);
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}
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}
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catch (...)
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{
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MAPNIK_LOG_ERROR(shape) << "Shape Plugin: error processing attributes";
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}
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}
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++count_;
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return feature;
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}
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MAPNIK_LOG_DEBUG(shape) << "shape_index_featureset: " << count_ << " features";
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return feature_ptr();
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}
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template <typename filterT>
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shape_index_featureset<filterT>::~shape_index_featureset() {}
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template class shape_index_featureset<mapnik::filter_in_box>;
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template class shape_index_featureset<mapnik::filter_at_point>;
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