152 lines
5.6 KiB
C++
152 lines
5.6 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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*
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* Initially developed by Sandro Santilli <strk@keybit.net> for CartoDB
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*
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*****************************************************************************/
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#ifndef PGRASTER_DATASOURCE_HPP
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#define PGRASTER_DATASOURCE_HPP
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// mapnik
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#include <mapnik/datasource.hpp>
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#include <mapnik/params.hpp>
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#include <mapnik/query.hpp>
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#include <mapnik/feature.hpp>
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#include <mapnik/geometry/box2d.hpp>
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#include <mapnik/coord.hpp>
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#include <mapnik/feature_layer_desc.hpp>
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#include <mapnik/unicode.hpp>
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#include <mapnik/value/types.hpp>
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#include <mapnik/datasource_plugin.hpp>
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// boost
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#include <boost/optional.hpp>
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// stl
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#include <regex>
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#include <vector>
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#include <string>
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#include <memory>
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#include "../postgis/connection_manager.hpp"
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#include "../postgis/resultset.hpp"
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#include "../postgis/cursorresultset.hpp"
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using mapnik::box2d;
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using mapnik::coord2d;
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using mapnik::datasource;
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using mapnik::feature_ptr;
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using mapnik::feature_style_context_map;
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using mapnik::featureset_ptr;
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using mapnik::layer_descriptor;
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using mapnik::parameters;
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using mapnik::processor_context_ptr;
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using mapnik::query;
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using mapnik::transcoder;
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typedef std::shared_ptr<ConnectionManager::PoolType> CnxPool_ptr;
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struct pgraster_overview
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{
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std::string schema;
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std::string table;
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std::string column;
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float scale; // max absolute scale between x and y
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};
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DATASOURCE_PLUGIN_DEF(pgraster_datasource_plugin, pgraster);
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class pgraster_datasource : public datasource
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{
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public:
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pgraster_datasource(const parameters& params);
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~pgraster_datasource();
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mapnik::datasource::datasource_t type() const override;
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static const char* name();
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processor_context_ptr get_context(feature_style_context_map&) const override;
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featureset_ptr features_with_context(query const& q, processor_context_ptr ctx) const override;
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featureset_ptr features(query const& q) const override;
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featureset_ptr features_at_point(coord2d const& pt, double tol = 0) const override;
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mapnik::box2d<double> envelope() const override;
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std::optional<mapnik::datasource_geometry_t> get_geometry_type() const override;
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layer_descriptor get_descriptor() const override;
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private:
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std::string sql_bbox(box2d<double> const& env) const;
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std::string populate_tokens(std::string const& sql,
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double scale_denom,
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box2d<double> const& env,
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double pixel_width,
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double pixel_height,
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mapnik::attributes const& vars,
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bool intersect = true) const;
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std::string populate_tokens(std::string const& sql) const;
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std::shared_ptr<IResultSet> get_resultset(std::shared_ptr<Connection>& conn,
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std::string const& sql,
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CnxPool_ptr const& pool,
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processor_context_ptr ctx = processor_context_ptr()) const;
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static const std::string RASTER_COLUMNS;
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static const std::string RASTER_OVERVIEWS;
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static const std::string SPATIAL_REF_SYS;
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const std::string uri_;
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const std::string username_;
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const std::string password_;
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// table name (schema qualified or not) or subquery
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const std::string table_;
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const std::string raster_table_; // possibly schema-qualified
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const std::string raster_field_;
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std::string parsed_schema_; // extracted from raster_table_ or table_
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std::string parsed_table_; // extracted from raster_table_ or table_
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std::string key_field_;
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mapnik::value_integer cursor_fetch_size_;
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mapnik::value_integer row_limit_;
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std::string geometryColumn_;
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mapnik::datasource::datasource_t type_;
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int srid_;
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// 1-based index of band to extract from the raster
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// 0 means fetch all bands
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// any index also forces color interpretation off so that values
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// arrives untouched into the resulting mapnik raster, for threatment
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// by raster colorizer
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int band_;
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// Available overviews, ordered by max scale, ascending
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std::vector<pgraster_overview> overviews_;
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mutable bool extent_initialized_;
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mutable mapnik::box2d<double> extent_;
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bool prescale_rasters_;
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bool use_overviews_;
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bool clip_rasters_;
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layer_descriptor desc_;
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ConnectionCreator<Connection> creator_;
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std::regex re_tokens_;
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int pool_max_size_;
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bool persist_connection_;
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bool extent_from_subquery_;
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bool estimate_extent_;
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int max_async_connections_;
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bool asynchronous_request_;
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int intersect_min_scale_;
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int intersect_max_scale_;
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};
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#endif // PGRASTER_DATASOURCE_HPP
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