/* * 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()); } }