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171 lines
6.0 KiB
171 lines
6.0 KiB
// Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License, version 2.0,
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// as published by the Free Software Foundation.
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//
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// This program is also distributed with certain software (including
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// but not limited to OpenSSL) that is licensed under separate terms,
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// as designated in a particular file or component or in included license
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// documentation. The authors of MySQL hereby grant you an additional
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// permission to link the program and your derivative works with the
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// separately licensed software that they have included with MySQL.
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//
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// This program 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
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// GNU General Public License, version 2.0, for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; 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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/// @file
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///
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/// Implements the is_simple functor and function.
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#include "sql/gis/is_simple.h" // gis::is_simple
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#include "sql/gis/is_simple_functor.h" // gis::Is_simple
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#include <boost/geometry.hpp>
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#include "my_dbug.h" // DBUG_ASSERT
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#include "sql/dd/types/spatial_reference_system.h" // dd::Spatial_reference_system
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#include "sql/gis/functor.h" // gis::null_value_exception
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#include "sql/gis/geometries.h" // gis::{Geometry{,_type}, Coordinate_system}
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#include "sql/gis/geometries_cs.h" // gis::{Cartesian_*, Geographic_*}
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#include "sql/gis/geometries_traits.h" // boost::geometry traits for gis types
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#include "sql/gis/intersects_functor.h" // gis::Intersects
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#include "sql/gis/touches_functor.h" // gis::Touches
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#include "sql/sql_exception_handler.h" // handle_gis_exception
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namespace bg = boost::geometry;
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namespace gis {
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Is_simple::Is_simple(double semi_major, double semi_minor)
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: m_geostrat{bg::srs::spheroid<double>(semi_major, semi_minor)},
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m_semi_major{semi_major},
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m_semi_minor{semi_minor} {}
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bool Is_simple::operator()(const Geometry &g) const {
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DBUG_ASSERT(!g.is_empty() || g.type() == Geometry_type::kGeometrycollection);
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return apply(*this, g);
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}
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bool Is_simple::eval(const Cartesian_point &g) const {
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return bg::is_simple(g);
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}
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bool Is_simple::eval(const Cartesian_linestring &g) const {
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return bg::is_simple(g);
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}
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bool Is_simple::eval(const Cartesian_polygon &g) const {
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return bg::is_simple(g);
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}
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bool Is_simple::eval(const Cartesian_multipoint &g) const {
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return bg::is_simple(g);
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}
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bool Is_simple::eval(const Cartesian_multipolygon &g) const {
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return bg::is_simple(g);
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}
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bool Is_simple::eval(const Cartesian_multilinestring &g) const {
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return bg::is_simple(g);
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}
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bool Is_simple::eval(const Geographic_point &g) const {
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return bg::is_simple(g, m_geostrat);
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}
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bool Is_simple::eval(const Geographic_linestring &g) const {
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return bg::is_simple(g, m_geostrat);
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}
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bool Is_simple::eval(const Geographic_polygon &g) const {
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return bg::is_simple(g, m_geostrat);
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}
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bool Is_simple::eval(const Geographic_multipoint &g) const {
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return bg::is_simple(g, m_geostrat);
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}
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bool Is_simple::eval(const Geographic_multipolygon &g) const {
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return bg::is_simple(g, m_geostrat);
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}
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bool Is_simple::eval(const Geographic_multilinestring &g) const {
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return bg::is_simple(g, m_geostrat);
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}
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bool Is_simple::eval(const Geometrycollection &g) const {
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// Boost does not yet implement operations on geometrycollections. This
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// function implements the SQL/MM Spatial specification.
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const Is_simple &is_simple = *this;
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Intersects intersects{m_semi_major, m_semi_minor};
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Touches touches{m_semi_major, m_semi_minor};
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auto interiors_intersect = [&](const Geometry &g1, const Geometry &g2) {
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// TODO: Express this function in terms of `boost::relate` when that gets a
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// functor.
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// [intersecting interior] = ([intersecting] and not [touching]).
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// Proof by relate mask:
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// [T*******] = ([not FF*FF***] and not [FT****** or F**T**** or F***T***])
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// However, `touches` throws when applied to two geometries with
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// dimentionality zero. Zero-dim geomtries have no boundary, so they cannot
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// 'touch'.
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// Extend `touches` to give false for zero-dim geometries.
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auto extension_of_touches = [&](const Geometry &g1, const Geometry &g2) {
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try {
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return touches(&g1, &g2);
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} catch (const null_value_exception &) {
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return false;
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}
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};
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return (intersects(&g1, &g2) && !extension_of_touches(g1, g2));
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};
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// The two requirements for simplicity of a gemetrycollection as described in
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// SQL/MM Part 3 Section 10.1.1 "Description" 9 are..
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for (size_t i = 0; i < g.size(); i++) {
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// 1) Subgeometries must be simple.
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if (!is_simple(g[i])) return false;
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// 2) Subgeometries must have mutually non-intersecting interiors.
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for (size_t j = 0; j < i; j++)
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if (interiors_intersect(g[i], g[j])) return false;
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}
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return true;
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}
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bool is_simple(const dd::Spatial_reference_system *srs, const Geometry *g,
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const char *func_name, bool *result,
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bool *result_null) noexcept {
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try {
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DBUG_ASSERT(!srs || srs->is_cartesian() || srs->is_geographic());
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DBUG_ASSERT(!srs || srs->is_cartesian() == (g->coordinate_system() ==
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Coordinate_system::kCartesian));
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DBUG_ASSERT(!srs ||
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srs->is_geographic() ==
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(g->coordinate_system() == Coordinate_system::kGeographic));
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*result_null = false;
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double semi_major = srs ? srs->semi_major_axis() : 0.0;
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double semi_minor = srs ? srs->semi_minor_axis() : 0.0;
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*result = Is_simple{semi_major, semi_minor}(*g);
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return false;
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} catch (...) { /* purecov: inspected */
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handle_gis_exception(func_name);
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return true;
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}
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}
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} // namespace gis
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