File: SimpleNestedRingTester.h

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/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2005-2006 Refractions Research Inc.
 * Copyright (C) 2001-2002 Vivid Solutions 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.
 *
 **********************************************************************
 *
 * Last port: operation/valid/SimpleNestedRingTester.java rev. 1.14 (JTS-1.10)
 *
 **********************************************************************/

#ifndef GEOS_OP_SIMPLENESTEDRINGTESTER_H
#define GEOS_OP_SIMPLENESTEDRINGTESTER_H

#include <geos/export.h>

#include <cstddef>
#include <vector>
#include <cstddef>

#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

// Forward declarations
namespace geos {
	namespace geom {
		class Coordinate;
		class LinearRing;
	}
	namespace geomgraph {
		class GeometryGraph;
	}
}

namespace geos {
namespace operation { // geos::operation
namespace valid { // geos::operation::valid

using namespace std;

/** \brief
 * Tests whether any of a set of {@link LinearRing}s are
 * nested inside another ring in the set, using a simple O(n^2)
 * comparison.
 *
 */
class GEOS_DLL SimpleNestedRingTester {
private:
	geomgraph::GeometryGraph *graph;  // used to find non-node vertices
	std::vector<geom::LinearRing*> rings;
	geom::Coordinate *nestedPt;
public:
	SimpleNestedRingTester(geomgraph::GeometryGraph *newGraph)
		:
		graph(newGraph),
		rings(),
		nestedPt(NULL)
	{}

	~SimpleNestedRingTester() {
	}

	void add(geom::LinearRing *ring) {
		rings.push_back(ring);
	}

	/*
	 * Be aware that the returned Coordinate (if != NULL)
	 * will point to storage owned by one of the LinearRing
	 * previously added. If you destroy them, this
	 * will point to an invalid memory address.
	 */
	geom::Coordinate *getNestedPoint() {
		return nestedPt;
	}

	bool isNonNested();
};

} // namespace geos.operation.valid
} // namespace geos.operation
} // namespace geos

#ifdef _MSC_VER
#pragma warning(pop)
#endif

#endif // GEOS_OP_SIMPLENESTEDRINGTESTER_H