/* * 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.noding; import java.util.*; import com.vividsolutions.jts.algorithm.LineIntersector; import com.vividsolutions.jts.geom.Coordinate; import com.vividsolutions.jts.geom.impl.CoordinateArraySequence; import com.vividsolutions.jts.io.WKTWriter; /** * Represents a list of contiguous line segments, * and supports noding the segments. * The line segments are represented by an array of {@link Coordinate}s. * Intended to optimize the noding of contiguous segments by * reducing the number of allocated objects. * SegmentStrings can carry a context object, which is useful * for preserving topological or parentage information. * All noded substrings are initialized with the same context object. * * @version 1.7 */ public class BasicSegmentString implements SegmentString { private Coordinate[] pts; private Object data; /** * Creates a new segment string from a list of vertices. * * @param pts the vertices of the segment string * @param data the user-defined data of this segment string (may be null) */ public BasicSegmentString(Coordinate[] pts, Object data) { this.pts = pts; this.data = data; } /** * Gets the user-defined data for this segment string. * * @return the user-defined data */ public Object getData() { return data; } /** * Sets the user-defined data for this segment string. * * @param data an Object containing user-defined data */ public void setData(Object data) { this.data = data; } public int size() { return pts.length; } public Coordinate getCoordinate(int i) { return pts[i]; } public Coordinate[] getCoordinates() { return pts; } public boolean isClosed() { return pts[0].equals(pts[pts.length - 1]); } /** * Gets the octant of the segment starting at vertex <code>index</code>. * * @param index the index of the vertex starting the segment. Must not be * the last index in the vertex list * @return the octant of the segment at the vertex */ public int getSegmentOctant(int index) { if (index == pts.length - 1) return -1; return Octant.octant(getCoordinate(index), getCoordinate(index + 1)); } public String toString() { return WKTWriter.toLineString(new CoordinateArraySequence(pts)); } }