/* * 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.geomgraph; import com.vividsolutions.jts.util.*; import com.vividsolutions.jts.geomgraph.Label; import com.vividsolutions.jts.geom.Coordinate; import com.vividsolutions.jts.geom.IntersectionMatrix; import com.vividsolutions.jts.util.Assert; /** * A GraphComponent is the parent class for the objects' * that form a graph. Each GraphComponent can carry a * Label. * @version 1.7 */ abstract public class GraphComponent { protected Label label; /** * isInResult indicates if this component has already been included in the result */ private boolean isInResult = false; private boolean isCovered = false; private boolean isCoveredSet = false; private boolean isVisited = false; public GraphComponent() { } public GraphComponent(Label label) { this.label = label; } public Label getLabel() { return label; } public void setLabel(Label label) { this.label = label; } public void setInResult(boolean isInResult) { this.isInResult = isInResult; } public boolean isInResult() { return isInResult; } public void setCovered(boolean isCovered) { this.isCovered = isCovered; this.isCoveredSet = true; } public boolean isCovered() { return isCovered; } public boolean isCoveredSet() { return isCoveredSet; } public boolean isVisited() { return isVisited; } public void setVisited(boolean isVisited) { this.isVisited = isVisited; } /** * @return a coordinate in this component (or null, if there are none) */ abstract public Coordinate getCoordinate(); /** * compute the contribution to an IM for this component */ abstract protected void computeIM(IntersectionMatrix im); /** * An isolated component is one that does not intersect or touch any other * component. This is the case if the label has valid locations for * only a single Geometry. * * @return true if this component is isolated */ abstract public boolean isIsolated(); /** * Update the IM with the contribution for this component. * A component only contributes if it has a labelling for both parent geometries */ public void updateIM(IntersectionMatrix im) { Assert.isTrue(label.getGeometryCount() >= 2, "found partial label"); computeIM(im); } }