161 lines
5.1 KiB
C++
161 lines
5.1 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) 2021 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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// mapnik
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#include <mapnik/global.hpp>
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#include <mapnik/debug.hpp>
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#include <mapnik/geometry/box2d.hpp>
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#include <mapnik/feature.hpp>
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#include <mapnik/feature_layer_desc.hpp>
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#include <mapnik/wkb.hpp>
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#include <mapnik/unicode.hpp>
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#include <mapnik/value/types.hpp>
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#include <mapnik/feature_factory.hpp>
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#include <mapnik/geometry/is_empty.hpp>
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#include <mapnik/geometry/envelope.hpp>
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// ogr
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#include "sqlite_featureset.hpp"
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#include "sqlite_utils.hpp"
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using mapnik::query;
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using mapnik::box2d;
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using mapnik::feature_ptr;
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using mapnik::geometry_utils;
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using mapnik::transcoder;
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using mapnik::feature_factory;
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sqlite_featureset::sqlite_featureset(std::shared_ptr<sqlite_resultset> rs,
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mapnik::context_ptr const& ctx,
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std::string const& encoding,
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mapnik::box2d<double> const& bbox,
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mapnik::wkbFormat format,
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bool twkb_encoding,
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bool spatial_index,
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bool using_subquery)
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: rs_(rs),
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ctx_(ctx),
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tr_(new transcoder(encoding)),
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bbox_(bbox),
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format_(format),
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twkb_encoding_(twkb_encoding),
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spatial_index_(spatial_index),
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using_subquery_(using_subquery)
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{}
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sqlite_featureset::~sqlite_featureset() {}
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feature_ptr sqlite_featureset::next()
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{
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while (rs_->is_valid () && rs_->step_next ())
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{
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int size;
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const char* data = (const char*) rs_->column_blob(0, size);
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if (data == 0)
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{
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return feature_ptr();
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}
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// null feature id is not acceptable
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if (rs_->column_type(1) == SQLITE_NULL)
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{
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MAPNIK_LOG_ERROR(postgis) << "sqlite_featureset: null value encountered for key_field";
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continue;
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}
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feature_ptr feature = feature_factory::create(ctx_,rs_->column_integer64(1));
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mapnik::geometry::geometry<double> geom;
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if (twkb_encoding_) geom = geometry_utils::from_twkb(data, size);
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else geom = geometry_utils::from_wkb(data, size, format_);
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if (mapnik::geometry::is_empty(geom))
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{
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continue;
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}
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if (!spatial_index_)
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{
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// we are not using r-tree index, check if feature intersects bounding box
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box2d<double> bbox = mapnik::geometry::envelope(geom);
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if (!bbox_.intersects(bbox))
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continue;
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}
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feature->set_geometry(std::move(geom));
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for (int i = 2; i < rs_->column_count(); ++i)
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{
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const int type_oid = rs_->column_type(i);
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const char* fld_name = rs_->column_name(i);
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if (! fld_name)
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continue;
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std::string fld_name_str(fld_name);
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// subqueries in sqlite lead to field double quoting which we need to strip
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if (using_subquery_)
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{
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sqlite_utils::dequote(fld_name_str);
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}
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switch (type_oid)
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{
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case SQLITE_INTEGER:
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{
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feature->put<mapnik::value_integer>(fld_name_str, rs_->column_integer64(i));
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break;
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}
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case SQLITE_FLOAT:
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{
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feature->put(fld_name_str, rs_->column_double(i));
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break;
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}
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case SQLITE_TEXT:
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{
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int text_col_size;
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const char * text_data = rs_->column_text(i, text_col_size);
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feature->put(fld_name_str, tr_->transcode(text_data, text_col_size));
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break;
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}
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case SQLITE_NULL:
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{
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// NOTE: we intentionally do not store null here
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// since it is equivalent to the attribute not existing
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break;
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}
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case SQLITE_BLOB:
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break;
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default:
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MAPNIK_LOG_WARN(sqlite) << "sqlite_featureset: Field=" << fld_name_str << " unhandled type_oid=" << type_oid;
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break;
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}
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}
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return feature;
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}
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return feature_ptr();
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}
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