/*
* Copyright (c) 2016 Vivid Solutions.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v. 1.0 which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
*
* http://www.eclipse.org/org/documents/edl-v10.php.
*/
package org.locationtech.jts.index.sweepline;
/**
* @version 1.7
*/
public class SweepLineEvent
implements Comparable
{
public static final int INSERT = 1;
public static final int DELETE = 2;
private double xValue;
private int eventType;
private SweepLineEvent insertEvent; // null if this is an INSERT event
private int deleteEventIndex;
SweepLineInterval sweepInt;
public SweepLineEvent(double x, SweepLineEvent insertEvent, SweepLineInterval sweepInt)
{
xValue = x;
this.insertEvent = insertEvent;
this.eventType = INSERT;
if (insertEvent != null)
eventType = DELETE;
this.sweepInt = sweepInt;
}
public boolean isInsert() { return insertEvent == null; }
public boolean isDelete() { return insertEvent != null; }
public SweepLineEvent getInsertEvent() { return insertEvent; }
public int getDeleteEventIndex() { return deleteEventIndex; }
public void setDeleteEventIndex(int deleteEventIndex) { this.deleteEventIndex = deleteEventIndex; }
SweepLineInterval getInterval() { return sweepInt; }
/**
* 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.
*/
public int compareTo(Object o) {
SweepLineEvent pe = (SweepLineEvent) o;
if (xValue < pe.xValue) return -1;
if (xValue > pe.xValue) return 1;
if (eventType < pe.eventType) return -1;
if (eventType > pe.eventType) return 1;
return 0;
}
}