Class GraphComponent

1
2
3
4	/*
5	* Copyright (c) 2016 Vivid Solutions.
6	*
7	* All rights reserved. This program and the accompanying materials
8	* are made available under the terms of the Eclipse Public License 2.0
9	* and Eclipse Distribution License v. 1.0 which accompanies this distribution.
10	* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v20.html
11	* and the Eclipse Distribution License is available at
12	*
13	* http://www.eclipse.org/org/documents/edl-v10.php.
14	*/
15	package org.locationtech.jts.geomgraph;
16
17	import org.locationtech.jts.geom.Coordinate;
18	import org.locationtech.jts.geom.IntersectionMatrix;
19	import org.locationtech.jts.util.Assert;
20
21	/**
22	* A GraphComponent is the parent class for the objects'
23	* that form a graph. Each GraphComponent can carry a
24	* Label.
25	* @version 1.7
26	*/
27	abstract public class GraphComponent {
28
29	protected Label label;
30	/**
31	* isInResult indicates if this component has already been included in the result
32	*/
33	private boolean isInResult = false;
34	private boolean isCovered = false;
35	private boolean isCoveredSet = false;
36	private boolean isVisited = false;
37
38	public GraphComponent() {
39	}
40
41	public GraphComponent(Label label) {
42	this.label = label;
43	}
44
45	public Label getLabel() { return label; }
46	public void setLabel(Label label) { this.label = label; }
47	public void setInResult(boolean isInResult) { this.isInResult = isInResult; }
48	public boolean isInResult() { return isInResult; }
49	public void setCovered(boolean isCovered)
50	{
51	this.isCovered = isCovered;
52	this.isCoveredSet = true;
53	}
54	public boolean isCovered() { return isCovered; }
55	public boolean isCoveredSet() { return isCoveredSet; }
56	public boolean isVisited() { return isVisited; }
57	public void setVisited(boolean isVisited) { this.isVisited = isVisited; }
58	/**
59	* @return a coordinate in this component (or null, if there are none)
60	*/
61	abstract public Coordinate getCoordinate();
62	/**
63	* compute the contribution to an IM for this component
64	*/
65	abstract protected void computeIM(IntersectionMatrix im);
66	/**
67	* An isolated component is one that does not intersect or touch any other
68	* component. This is the case if the label has valid locations for
69	* only a single Geometry.
70	*
71	* @return true if this component is isolated
72	*/
73	abstract public boolean isIsolated();
74	/**
75	* Update the IM with the contribution for this component.
76	* A component only contributes if it has a labelling for both parent geometries
77	*/
78	public void updateIM(IntersectionMatrix im)
79	{
80	Assert.isTrue(label.getGeometryCount() >= 2, "found partial label");
81	computeIM(im);
82	}
83
84	}
85