/**********************************************************************
 * $Id: SimpleNestedRingTester.h 1820 2006-09-06 16:54:23Z mloskot $
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.refractions.net
 *
 * 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.
 *
 **********************************************************************/

#ifndef GEOS_OP_SIMPLENESTEDRINGTESTER_H
#define GEOS_OP_SIMPLENESTEDRINGTESTER_H

#include <vector>

// 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

/** \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 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

#endif // GEOS_OP_SIMPLENESTEDRINGTESTER_H

/**********************************************************************
 * $Log$
 * Revision 1.1  2006/03/20 16:57:44  strk
 * spatialindex.h and opValid.h headers split
 *
 **********************************************************************/