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

#ifndef GEOS_OP_OVERLAY_MINIMALEDGERING_H
#define GEOS_OP_OVERLAY_MINIMALEDGERING_H

#include <geos/geomgraph/EdgeRing.h> // for inheritance
#include <geos/geomgraph/DirectedEdge.h> // for inlines

#include <vector>

#include <geos/inline.h>

// Forward declarations
namespace geos {
	namespace geom {
		class GeometryFactory;
	}
	namespace geomgraph {
		class DirectedEdge;
		class EdgeRing;
	}
}

namespace geos {
namespace operation { // geos::operation
namespace overlay { // geos::operation::overlay

/** \brief
 * A ring of {@link Edge}s with the property that no node
 * has degree greater than 2. 
 *
 * These are the form of rings required
 * to represent polygons under the OGC SFS spatial data model.
 *
 * @see operation::overlay::MaximalEdgeRing
 *
 */
class MinimalEdgeRing: public geomgraph::EdgeRing {

public:

	// CGAlgorithms argument obsoleted
	MinimalEdgeRing(geomgraph::DirectedEdge *start,
		const geom::GeometryFactory *geometryFactory);

	virtual ~MinimalEdgeRing();

	geomgraph::DirectedEdge* getNext(geomgraph::DirectedEdge *de);

	void setEdgeRing(geomgraph::DirectedEdge *de,
			geomgraph::EdgeRing *er);
};


} // namespace geos::operation::overlay
} // namespace geos::operation
} // namespace geos

#ifdef GEOS_INLINE
#include <geos/operation/overlay/MinimalEdgeRing.inl>
#endif

#endif // ndef GEOS_OP_OVERLAY_MINIMALEDGERING_H

/**********************************************************************
 * $Log$
 * Revision 1.2  2006/03/27 16:02:34  strk
 * Added INL file for MinimalEdgeRing, added many debugging blocks,
 * fixed memory leak in ConnectedInteriorTester (bug #59)
 *
 * Revision 1.1  2006/03/17 13:24:59  strk
 * opOverlay.h header splitted. Reduced header inclusions in operation/overlay implementation files. ElevationMatrixFilter code moved from own file to ElevationMatrix.cpp (ideally a class-private).
 *
 **********************************************************************/