/*
* 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.geom.util;
import java.util.*;
import com.vividsolutions.jts.geom.*;
/**
* Extracts a single representative {@link Coordinate}
* from each connected component of a {@link Geometry}.
*
* @version 1.9
*/
public class ComponentCoordinateExtracter
implements GeometryComponentFilter
{
/**
* Extracts the linear components from a single geometry.
* If more than one geometry is to be processed, it is more
* efficient to create a single {@link ComponentCoordinateExtracter} instance
* and pass it to multiple geometries.
*
* @param geom the Geometry from which to extract
* @return a list of Coordinates
*/
public static List getCoordinates(Geometry geom)
{
List coords = new ArrayList();
geom.apply(new ComponentCoordinateExtracter(coords));
return coords;
}
private List coords;
/**
* Constructs a LineExtracterFilter with a list in which to store LineStrings found.
*/
public ComponentCoordinateExtracter(List coords)
{
this.coords = coords;
}
public void filter(Geometry geom)
{
// add coordinates from connected components
if (geom instanceof LineString
|| geom instanceof Point)
coords.add(geom.getCoordinate());
}
}