UniqueCoordinateArrayFilter.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2001-2002 Vivid Solutions Inc.
 * Copyright (C) 2006 Refractions Research Inc.
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation.
 * See the COPYING file for more information.
 *
 **********************************************************************/
 
#pragma once
 
#include <geos/export.h>
#include <cassert>
#include <set>
#include <vector>
 
#include <geos/geom/CoordinateFilter.h>
#include <geos/geom/CoordinateSequence.h>
#include <geos/geom/Coordinate.h>
 
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
#endif
 
namespace geos {
namespace util { // geos::util
 
/*
 *  A CoordinateFilter that fills a vector of Coordinate const pointers.
 *  The set of coordinates contains no duplicate points.
 *
 *  Last port: util/UniqueCoordinateArrayFilter.java rev. 1.17
 */
class GEOS_DLL UniqueCoordinateArrayFilter : public geom::CoordinateInspector<UniqueCoordinateArrayFilter> {
public:
    UniqueCoordinateArrayFilter(std::vector<const geom::Coordinate*>& target)
        : pts(target)
        , maxUnique(NO_COORD_INDEX)
    {}
 
    UniqueCoordinateArrayFilter(std::vector<const geom::Coordinate*>& target, std::size_t p_maxUnique)
        : pts(target)
        , maxUnique(p_maxUnique)
    {}
 
    ~UniqueCoordinateArrayFilter() override {}
 
    template<typename CoordType>
    void filter(const CoordType* coord)
    {
        if(uniqPts.insert(coord).second) {
            // TODO make `pts` a CoordinateSequence rather than coercing the type
            pts.push_back(coord);
        }
        if(maxUnique != NO_COORD_INDEX && uniqPts.size() > maxUnique) {
            done = true;
        }
    }
 
    void filter(const geom::CoordinateXY*) {
        assert(0); // not supported
    }
 
 
    void filter(const geom::CoordinateXYM*) {
        assert(0); // not supported
    }
 
    bool isDone() const override {
        return done;
    }
 
private:
    std::vector<const geom::Coordinate*>& pts;  // target set reference
    std::set<const geom::CoordinateXY*, geom::CoordinateLessThan> uniqPts;      // unique points set
    std::size_t maxUnique; // stop visiting when we have this many unique coordinates
    bool done = false;
 
    // Declare type as noncopyable
    UniqueCoordinateArrayFilter(const UniqueCoordinateArrayFilter& other) = delete;
    UniqueCoordinateArrayFilter& operator=(const UniqueCoordinateArrayFilter& rhs) = delete;
};
 
 
} // namespace geos::util
} // namespace geos
 
#ifdef _MSC_VER
#pragma warning(pop)
#endif