/*
* 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 java.io.PrintStream;
import java.util.*;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Location;
import com.vividsolutions.jts.geomgraph.Node;
/**
* A map of nodes, indexed by the coordinate of the node
* @version 1.7
*/
public class NodeMap
{
//Map nodeMap = new HashMap();
Map nodeMap = new TreeMap();
NodeFactory nodeFact;
public NodeMap(NodeFactory nodeFact) {
this.nodeFact = nodeFact;
}
/**
* Factory function - subclasses can override to create their own types of nodes
*/
/*
protected Node createNode(Coordinate coord)
{
return new Node(coord);
}
*/
/**
* This method expects that a node has a coordinate value.
*/
public Node addNode(Coordinate coord)
{
Node node = (Node) nodeMap.get(coord);
if (node == null) {
node = nodeFact.createNode(coord);
nodeMap.put(coord, node);
}
return node;
}
public Node addNode(Node n)
{
Node node = (Node) nodeMap.get(n.getCoordinate());
if (node == null) {
nodeMap.put(n.getCoordinate(), n);
return n;
}
node.mergeLabel(n);
return node;
}
/**
* Adds a node for the start point of this EdgeEnd
* (if one does not already exist in this map).
* Adds the EdgeEnd to the (possibly new) node.
*/
public void add(EdgeEnd e)
{
Coordinate p = e.getCoordinate();
Node n = addNode(p);
n.add(e);
}
/**
* @return the node if found; null otherwise
*/
public Node find(Coordinate coord) { return (Node) nodeMap.get(coord); }
public Iterator iterator()
{
return nodeMap.values().iterator();
}
public Collection values()
{
return nodeMap.values();
}
public Collection getBoundaryNodes(int geomIndex)
{
Collection bdyNodes = new ArrayList();
for (Iterator i = iterator(); i.hasNext(); ) {
Node node = (Node) i.next();
if (node.getLabel().getLocation(geomIndex) == Location.BOUNDARY)
bdyNodes.add(node);
}
return bdyNodes;
}
public void print(PrintStream out)
{
for (Iterator it = iterator(); it.hasNext(); )
{
Node n = (Node) it.next();
n.print(out);
}
}
}