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#ifndef SQL_GIS_GEOMETRY_EXTRACTION_H_INCLUDED
#define SQL_GIS_GEOMETRY_EXTRACTION_H_INCLUDED
// Copyright (c) 2021, 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.
#include "my_sys.h" // my_error
#include "sql/dd/cache/dictionary_client.h"
#include "sql/gis/geometries.h"
#include "sql/sql_class.h" // THD
#include <algorithm>
#include <memory>
/// @file
///
/// This file contains a few convenience functions for working with Geometries,
/// to avoid boilerplate and mishandling of Geometries.
/// Type used to differentiate the three cases that can happen when parsing a
/// geometry.
enum class ResultType { Error, NullValue, Value };
/// Type used to handle both the result of the decoding of a geometry and the
/// geometry in the case of success.
class GeometryExtractionResult {
private:
const ResultType m_resultType;
std::unique_ptr<gis::Geometry> m_value;
gis::srid_t srid = 0;
public:
ResultType GetResultType() const { return m_resultType; }
gis::srid_t GetSrid() const {
assert(m_resultType == ResultType::Value);
return srid;
}
std::unique_ptr<gis::Geometry> GetValue() {
assert(m_resultType == ResultType::Value);
return std::move(m_value);
}
explicit GeometryExtractionResult(ResultType resultType)
: m_resultType(resultType) {
if (resultType == ResultType::Value) {
throw ResultType::Error;
}
}
explicit GeometryExtractionResult(std::unique_ptr<gis::Geometry> geometry,
gis::srid_t srid)
: m_resultType(ResultType::Value),
m_value(std::move(geometry)),
srid(srid) {}
};
/// ExtractGeometry takes an Item or a Field, attempts to parse a geometry out
/// of it and returns a value combining the result of the parsing process with
/// the geometry in case it is a success.
///
/// @param[in] fieldOrItem The Field or Item we want a geometry from.
/// @param[in] thd THD* to report errors on
/// @param[in] func_name C-string to report errors as.
/// @returns GeometryExtractionResult which holds a result and an optional
/// Geometry
template <typename FieldOrItem>
GeometryExtractionResult ExtractGeometry(FieldOrItem *fieldOrItem, THD *thd,
const char *func_name) {
String backing_arg_wkb;
if (fieldOrItem->result_type() != STRING_RESULT) {
my_error(ER_GIS_INVALID_DATA, MYF(0), func_name);
return GeometryExtractionResult(ResultType::Error);
}
if (fieldOrItem->is_null()) {
return GeometryExtractionResult(ResultType::NullValue);
}
String *arg_wkb = fieldOrItem->val_str(&backing_arg_wkb);
if (thd->is_error()) {
return GeometryExtractionResult(ResultType::Error);
}
if (nullptr == arg_wkb) {
my_error(ER_GIS_INVALID_DATA, MYF(0), func_name);
return GeometryExtractionResult(ResultType::Error);
}
std::unique_ptr<dd::cache::Dictionary_client::Auto_releaser> releaser(
new dd::cache::Dictionary_client::Auto_releaser(
current_thd->dd_client()));
const dd::Spatial_reference_system *srs = nullptr;
std::unique_ptr<gis::Geometry> geo;
bool result = gis::parse_geometry(thd, func_name, arg_wkb, &srs, &geo);
if (result == true) {
return GeometryExtractionResult(ResultType::Error);
} else {
return GeometryExtractionResult(std::move(geo), srs ? srs->id() : 0);
}
}
#endif // SQL_GIS_GEOMETRY_EXTRACTION_H_INCLUDED
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