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Java > Open Source Codes > org > quilt > graph > Entry


1 /* Entry.java */
2
3 package org.quilt.graph;
4
5 import org.quilt.exception.QuiltException;
6
7 /**
8  * The entry vertex in a directed graph.
9  *
10  * @author < a HREF="jddixon@users.sourceforge.net">Jim Dixon</a>
11  */
12
13 public class Entry extends Vertex {
14
15     public Entry (Directed g) {
16         if (g == null) {
17             throw new IllegalArgumentException JavaDoc ("null graph");
18         }
19         graph = g;
20         index = g.anotherVertex(this);
21         Edge edge = new Edge(this, this) ;
22         connector = new UnaryConnector (edge);
23         edge.insert (new Exit(g));
24     }
25
26     // ACCESSOR METHODS /////////////////////////////////////////////
27 public Connector getConnector() {
28         return connector;
29     }
30     public Edge getEdge() {
31         return connector.getEdge();
32     }
33     // OTHER METHODS ////////////////////////////////////////////////
34 public Vertex getTarget () {
35         return connector.getTarget();
36     }
37     public void setTarget(Vertex v) {
38         checkForNull (v, "target");
39         if ( v.getGraph() != graph) {
40             throw new IllegalArgumentException JavaDoc (
41                                     "target must be in same graph");
42         }
43         ((UnaryConnector)connector).setTarget(v);
44     }
45     public String JavaDoc toString () {
46         return "Entry " + super.toString();
47     }
48 }
49
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