/*
* 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.distance;
import java.util.*;
import com.vividsolutions.jts.geom.*;
/**
* Extracts a single point
* from each connected element in a Geometry
* (e.g. a polygon, linestring or point)
* and returns them in a list
*
* @version 1.7
*/
public class ConnectedElementPointFilter
implements GeometryFilter
{
/**
* Returns a list containing a Coordinate from each Polygon, LineString, and Point
* found inside the specified geometry. Thus, if the specified geometry is
* not a GeometryCollection, an empty list will be returned.
*/
public static List getCoordinates(Geometry geom)
{
List pts = new ArrayList();
geom.apply(new ConnectedElementPointFilter(pts));
return pts;
}
private List pts;
ConnectedElementPointFilter(List pts)
{
this.pts = pts;
}
public void filter(Geometry geom)
{
if (geom instanceof Point
|| geom instanceof LineString
|| geom instanceof Polygon )
pts.add(geom.getCoordinate());
}
}