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// Copyright (c) 2020, 2025, Oracle and/or its affiliates.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License, version 2.0,
// as published by the Free Software Foundation.
//
// This program is designed to work with certain software (including
// but not limited to OpenSSL) that is licensed under separate terms,
// as designated in a particular file or component or in included license
// documentation. The authors of MySQL hereby grant you an additional
// permission to link the program and your derivative works with the
// separately licensed software that they have either included with
// the program or referenced in the documentation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License, version 2.0, for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
/// @file
///
/// This file implements utility functions for spatial operations
/// (union, intersection, difference, symdifference).
#include "sql/gis/so_utils.h"
#include "sql/gis/equals_functor.h"
#include "sql/gis/geometries.h"
#include "sql/gis/geometries_cs.h"
#include "sql/gis/geometries_traits.h"
#include "template_utils.h" // down_cast
namespace gis {
template <typename MPt, typename MLs, typename MPy, typename GC>
static void typed_remove_duplicates(double semi_major, double semi_minor,
std::unique_ptr<Geometry> *g) {
Equals equals(semi_major, semi_minor);
switch (g->get()->type()) {
case Geometry_type::kPoint:
case Geometry_type::kLinestring:
case Geometry_type::kPolygon:
break;
case Geometry_type::kMultipoint: {
std::unique_ptr<MPt> mpt = std::make_unique<MPt>();
for (auto pt : *down_cast<MPt *>(g->get())) {
bool include = true;
for (auto pt2 : *mpt) {
if (equals(&pt, &pt2)) {
include = false;
break;
}
}
if (include) mpt->push_back(pt);
}
g->reset(mpt.release());
break;
}
case Geometry_type::kMultilinestring: {
std::unique_ptr<MLs> mls = std::make_unique<MLs>();
for (auto ls : *down_cast<MLs *>(g->get())) {
bool include = true;
for (auto ls2 : *mls) {
if (equals(&ls, &ls2)) {
include = false;
break;
}
}
if (include) mls->push_back(ls);
}
g->reset(mls.release());
break;
}
case Geometry_type::kMultipolygon: {
std::unique_ptr<MPy> mpy = std::make_unique<MPy>();
for (auto py : *down_cast<MPy *>(g->get())) {
bool include = true;
for (auto py2 : *mpy) {
if (equals(&py, &py2)) {
include = false;
break;
}
}
if (include) mpy->push_back(py);
}
g->reset(mpy.release());
break;
}
case Geometry_type::kGeometrycollection: {
std::unique_ptr<GC> gc = std::make_unique<GC>();
for (auto g1 : *down_cast<GC *>(g->get())) {
if (g1->is_empty()) continue;
std::unique_ptr<Geometry> g1_ptr(g1->clone());
typed_remove_duplicates<MPt, MLs, MPy, GC>(semi_major, semi_minor,
&g1_ptr);
bool include = true;
for (auto g2 : *gc) {
if (equals(g1_ptr.get(), g2)) {
include = false;
break;
}
}
if (include) gc->push_back(*g1_ptr);
}
g->reset(gc.release());
break;
}
default: {
assert(false);
break;
}
}
}
void remove_duplicates(double semi_major, double semi_minor,
std::unique_ptr<Geometry> *g) {
switch (g->get()->coordinate_system()) {
case Coordinate_system::kCartesian:
typed_remove_duplicates<Cartesian_multipoint, Cartesian_multilinestring,
Cartesian_multipolygon,
Cartesian_geometrycollection>(semi_major,
semi_minor, g);
break;
case Coordinate_system::kGeographic:
typed_remove_duplicates<Geographic_multipoint, Geographic_multilinestring,
Geographic_multipolygon,
Geographic_geometrycollection>(semi_major,
semi_minor, g);
break;
default:
break;
}
}
void narrow_geometry(std::unique_ptr<Geometry> *g) {
switch (g->get()->type()) {
case Geometry_type::kPoint:
case Geometry_type::kLinestring:
case Geometry_type::kPolygon: {
break;
}
case Geometry_type::kMultipoint:
case Geometry_type::kMultilinestring:
case Geometry_type::kMultipolygon:
case Geometry_type::kGeometrycollection: {
Geometrycollection *gc = down_cast<Geometrycollection *>(g->get());
if (gc->size() == 1) {
g->reset((*gc)[0].clone());
gc = nullptr;
narrow_geometry(g);
}
break;
}
default: {
// All Geometry types have been checked.
assert(false);
break;
}
}
}
} // namespace gis
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