/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2001-2002 Vivid Solutions Inc.
 * Copyright (C) 2005 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.
 *
 **********************************************************************/

#include <sstream>

#include <geos/geomgraph/index/SweepLineEvent.h>
#include <geos/geomgraph/index/SweepLineEventObj.h>

using namespace std;

namespace geos {
namespace geomgraph { // geos.geomgraph
namespace index { // geos.geomgraph.index

SweepLineEvent::SweepLineEvent(void* newEdgeSet, double x,
	SweepLineEvent *newInsertEvent, SweepLineEventOBJ *newObj):
		edgeSet(newEdgeSet),
		obj(newObj),
		xValue(x),
		insertEvent(newInsertEvent),
		deleteEventIndex(0)
{
	if(insertEvent!=NULL) eventType=DELETE_EVENT;
	else eventType=INSERT_EVENT;
}

SweepLineEvent::~SweepLineEvent(){
	if (eventType==DELETE_EVENT) {
		delete insertEvent;
		delete obj; 
	}
}

/**
 * ProjectionEvents are ordered first by their x-value, and then by their
 * eventType.
 * It is important that Insert events are sorted before Delete events, so that
 * items whose Insert and Delete events occur at the same x-value will be
 * correctly handled.
 */
int
SweepLineEvent::compareTo(SweepLineEvent *sle)
{
	if (xValue<sle->xValue) return -1;
	if (xValue>sle->xValue) return 1;
	if (eventType<sle->eventType) return -1;
	if (eventType>sle->eventType) return 1;
	return 0;
}

string
SweepLineEvent::print()
{
	ostringstream s;

	s<<"SweepLineEvent:";
	s<<" xValue="<<xValue<<" deleteEventIndex="<<deleteEventIndex;
	s<<( (eventType==INSERT_EVENT) ? " INSERT_EVENT" : " DELETE_EVENT" );
	s<<endl<<"\tinsertEvent=";
	if (insertEvent) s<<insertEvent->print();
	else s<<"NULL";
	return s.str();
}

} // namespace geos.geomgraph.index
} // namespace geos.geomgraph
} // namespace geos