/*
* Copyright (c) 2016 Vivid Solutions.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v. 1.0 which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
*
* http://www.eclipse.org/org/documents/edl-v10.php.
*/
package org.locationtech.jts.operation.distance;
import java.util.ArrayList;
import java.util.List;
import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.geom.GeometryFilter;
import org.locationtech.jts.geom.LineString;
import org.locationtech.jts.geom.Point;
import org.locationtech.jts.geom.Polygon;
/**
* 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());
}
}