Skip to content
Permalink
master
Switch branches/tags
Go to file
 
 
Cannot retrieve contributors at this time
131 lines (114 sloc) 3.58 KB
/*
* 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.geomgraph;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.noding.OrientedCoordinateArray;
import java.io.PrintStream;
import java.util.*;
/**
* A EdgeList is a list of Edges. It supports locating edges
* that are pointwise equals to a target edge.
*
* @version 1.7
*/
public class EdgeList {
private List edges = new ArrayList();
/**
* An index of the edges, for fast lookup.
*/
private Map ocaMap = new TreeMap();
public EdgeList() {
}
/**
* Insert an edge unless it is already in the list
*/
public void add(Edge e) {
edges.add(e);
OrientedCoordinateArray oca = new OrientedCoordinateArray(e.getCoordinates());
ocaMap.put(oca, e);
}
public void addAll(Collection edgeColl) {
for (Iterator i = edgeColl.iterator(); i.hasNext(); ) {
add((Edge) i.next());
}
}
public List getEdges() {
return edges;
}
/**
* If there is an edge equal to e already in the list, return it.
* Otherwise return null.
*
* @return equal edge, if there is one already in the list
* null otherwise
*/
public Edge findEqualEdge(Edge e) {
OrientedCoordinateArray oca = new OrientedCoordinateArray(e.getCoordinates());
// will return null if no edge matches
Edge matchEdge = (Edge) ocaMap.get(oca);
return matchEdge;
}
public Iterator iterator() {
return edges.iterator();
}
public Edge get(int i) {
return (Edge) edges.get(i);
}
/**
* If the edge e is already in the list, return its index.
*
* @return index, if e is already in the list
* -1 otherwise
*/
public int findEdgeIndex(Edge e) {
for (int i = 0; i < edges.size(); i++) {
if (((Edge) edges.get(i)).equals(e)) return i;
}
return -1;
}
public void print(PrintStream out) {
out.print("MULTILINESTRING ( ");
for (int j = 0; j < edges.size(); j++) {
Edge e = (Edge) edges.get(j);
if (j > 0) out.print(",");
out.print("(");
Coordinate[] pts = e.getCoordinates();
for (int i = 0; i < pts.length; i++) {
if (i > 0) out.print(",");
out.print(pts[i].x + " " + pts[i].y);
}
out.println(")");
}
out.print(") ");
}
}