/*
* 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;
/**
* 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);
}
}