/*
* 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;
/**
* A ConnectedElementPointFilter extracts a single point
* from each connected element in a Geometry
* (e.g. a polygon, linestring or point)
* and returns them in a list. The elements of the list are
* {@link org.locationtech.jts.operation.distance.GeometryLocation}s.
*
* @version 1.7
*/
public class ConnectedElementLocationFilter
implements GeometryFilter
{
/**
* Returns a list containing a point 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. The elements of the list
* are {@link org.locationtech.jts.operation.distance.GeometryLocation}s.
*/
public static List getLocations(Geometry geom)
{
List locations = new ArrayList();
geom.apply(new ConnectedElementLocationFilter(locations));
return locations;
}
private List locations;
ConnectedElementLocationFilter(List locations)
{
this.locations = locations;
}
public void filter(Geometry geom)
{
if (geom instanceof Point
|| geom instanceof LineString
|| geom instanceof Polygon )
locations.add(new GeometryLocation(geom, 0, geom.getCoordinate()));
}
}