gc_utils.h

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#ifndef SQL_GIS_GC_UTILS_H_INCLUDED
#define SQL_GIS_GC_UTILS_H_INCLUDED
 
// Copyright (c) 2017, 2024, 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.
//
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// 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,
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License, version 2.0, for more details.
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/// @file
///
/// This file declares the interface of various utility functions for
/// geometrycollections. The functions may throw exceptions.
 
#include <memory>  // std::unique_ptr
 
#include "sql/dd/types/spatial_reference_system.h"  // dd::Spatial_reference_system
#include "sql/gis/difference_functor.h"
#include "sql/gis/geometries.h"
#include "sql/gis/union_functor.h"
 
namespace gis {
 
/// Invalid geometry exception.
///
/// Thrown when it is discovered that at an input parameter contains an invalid
/// geometry.
class invalid_geometry_exception : public std::exception {};
 
/// Too large polygon exception.
///
/// Thrown when it is discovered that at a polygon covers half the globe or
/// more. Boost Geometry doesn't handle such polygons.
class too_large_polygon_exception : public std::exception {};
 
/// Splits a geometrycollection into points, linestrings and polygons.
///
/// All output collections may contain overlapping geometries and
/// duplicates. This is not a problem for the multipoint and multilinestring
/// outputs, but the multipolygon may be geometrically invalid.
///
/// @param[in] gc Geometry collection.
/// @param[out] mpt All points in the geometrycollection.
/// @param[out] mls All linestrings in the geometrycollection.
/// @param[out] mpy All polygons in the geometrycollection.
void split_gc(const Geometrycollection *gc, std::unique_ptr<Multipoint> *mpt,
              std::unique_ptr<Multilinestring> *mls,
              std::unique_ptr<Multipolygon> *mpy);
 
/// Cleans up overlapping geometries so that the geometrycollection is broken
/// down into non-overlapping collections.
///
/// All input collections may contain overlapping geometries and
/// duplicates, including the multipolygon. This function requires that at least
/// one of the inputs must be non-empty.
///
/// May throw exceptions from BG operations.
///
/// @param[in] semi_major Semi-major axis of ellipsoid.
/// @param[in] semi_minor Semi-minor axis of ellipsoid.
/// @param[in,out] mpt All points in the geometrycollection.
/// @param[in,out] mls All linestrings in the geometrycollection.
/// @param[in,out] mpy All polygons in the geometrycollection.
void gc_union(double semi_major, double semi_minor,
              std::unique_ptr<Multipoint> *mpt,
              std::unique_ptr<Multilinestring> *mls,
              std::unique_ptr<Multipolygon> *mpy);
 
/// Narrows down a geometrycollection to return a Multipoint, Multilinestring
/// or a Multipolygon if the first level of the geometrycollection contains
/// only points, linestrings or polygons. Otherwise, if the contents is
/// heterogeneous or contains a geometrycollection, returns the input
/// geometrycollection.
///
/// @param[in] geometrycollection Geometrycollection to be narroweed down.
/// @return The narrowest type that can contain all the geometries in the input.
std::unique_ptr<gis::Geometrycollection> narrowest_multigeometry(
    std::unique_ptr<Geometrycollection> geometrycollection);
}  // namespace gis
 
#endif  // SQL_GIS_GC_UTILS_H_INCLUDED