/*
* The JTS Topology Suite is a collection of Java classes that
* implement the fundamental operations required to validate a given
* geo-spatial data set to a known topological specification.
*
* Copyright (C) 2001 Vivid Solutions
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For more information, contact:
*
* Vivid Solutions
* Suite #1A
* 2328 Government Street
* Victoria BC V8T 5G5
* Canada
*
* (250)385-6040
* www.vividsolutions.com
*/
package com.vividsolutions.jts.operation.linemerge;
import com.vividsolutions.jts.geom.*;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.CoordinateList;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LineString;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* A sequence of {@link LineMergeDirectedEdge}s forming one of the lines that will
* be output by the line-merging process.
*
* @version 1.7
*/
public class EdgeString {
private GeometryFactory factory;
private List directedEdges = new ArrayList();
private Coordinate[] coordinates = null;
/**
* Constructs an EdgeString with the given factory used to convert this EdgeString
* to a LineString
*/
public EdgeString(GeometryFactory factory) {
this.factory = factory;
}
/**
* Adds a directed edge which is known to form part of this line.
*/
public void add(LineMergeDirectedEdge directedEdge) {
directedEdges.add(directedEdge);
}
private Coordinate[] getCoordinates() {
if (coordinates == null) {
int forwardDirectedEdges = 0;
int reverseDirectedEdges = 0;
CoordinateList coordinateList = new CoordinateList();
for (Iterator i = directedEdges.iterator(); i.hasNext();) {
LineMergeDirectedEdge directedEdge = (LineMergeDirectedEdge) i.next();
if (directedEdge.getEdgeDirection()) {
forwardDirectedEdges++;
}
else {
reverseDirectedEdges++;
}
coordinateList.add(((LineMergeEdge) directedEdge.getEdge()).getLine()
.getCoordinates(), false,
directedEdge.getEdgeDirection());
}
coordinates = coordinateList.toCoordinateArray();
if (reverseDirectedEdges > forwardDirectedEdges) {
CoordinateArrays.reverse(coordinates);
}
}
return coordinates;
}
/**
* Converts this EdgeString into a LineString.
*/
public LineString toLineString() {
return factory.createLineString(getCoordinates());
}
}