/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
*
* 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;
* version 2.1 of the License.
*
* 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.
*/
package org.geotools.gml;
import java.util.ArrayList;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LinearRing;
import com.vividsolutions.jts.geom.TopologyException;
/**
* Creates a simple OGC LinearRing (a closed LineString).
*
* @author Ian Turton, CCG
* @author Rob Hranac, Vision for New York
*
*
* @source $URL$
* @version $Id$
*/
public class SubHandlerLinearRing extends SubHandler {
/** Internal coordinate list. */
private ArrayList coordinateList = new ArrayList();
/**
* Creates a new instance of GMLLinearRingHandler.
*/
public SubHandlerLinearRing() {
}
/**
* Adds a coordinate to the LinearRing.
*
* @param coordinate The coordinate to add to the LinearRing.
*/
public void addCoordinate(Coordinate coordinate) {
coordinateList.add(coordinate);
}
/**
* Determine whether or not this LinearRing is ready to be created.
*
* @param message The current geometry type in the GML stream.
*
* @return Ready for creation flag.
*/
public boolean isComplete(String message) {
// makes sure that this LinearRing has more than one coordinate and its first and last are identical
if (coordinateList.size() > 1) {
Coordinate firstCoordinate = (Coordinate) coordinateList.get(0);
Coordinate lastCoordinate = (Coordinate) coordinateList.get(coordinateList
.size() - 1);
if (lastCoordinate.equals2D(firstCoordinate)) {
return true;
} else {
return false;
}
} else {
return false;
}
}
/**
* Create the LinearRing.
*
* @param geometryFactory The geometry factory used for the build.
*
* @return LinearRing geometry created.
*/
public Geometry create(GeometryFactory geometryFactory) {
try {
Coordinate[] coords = (Coordinate[]) coordinateList.toArray(new Coordinate[coordinateList.size()]);
LinearRing ring = geometryFactory.createLinearRing(coords);
ring.setUserData( getSRS() );
ring.setSRID( getSRID() );
return ring;
} catch (TopologyException e) {
System.err.println(
"Caught Topology exception in GMLLinearRingHandler");
return null;
}
}
}