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1 /* ==========================================
2  * JGraphT : a free Java graph-theory library
3  * ==========================================
4  *
5  * Project Info: http://jgrapht.sourceforge.net/
6  * Project Creator: Barak Naveh (http://sourceforge.net/users/barak_naveh)
7  *
8  * (C) Copyright 2003-2006, by Barak Naveh and Contributors.
9  *
10  * This library is free software; you can redistribute it and/or modify it
11  * under the terms of the GNU Lesser General Public License as published by
12  * the Free Software Foundation; either version 2.1 of the License, or
13  * (at your option) any later version.
14  *
15  * This library is distributed in the hope that it will be useful, but
16  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
18  * License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public License
21  * along with this library; if not, write to the Free Software Foundation,
22  * Inc.,
23  * 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
24  */
25 /* --------------------
26  * UndirectedGraph.java
27  * --------------------
28  * (C) Copyright 2003-2006, by Barak Naveh and Contributors.
29  *
30  * Original Author: Barak Naveh
31  * Contributor(s): Christian Hammer
32  *
33  * $Id: UndirectedGraph.java 504 2006-07-03 02:37:26Z perfecthash $
34  *
35  * Changes
36  * -------
37  * 24-Jul-2003 : Initial revision (BN);
38  * 11-Mar-2004 : Made generic (CH);
39  *
40  */
41 package org.jgrapht;
42
43 /**
44  * A graph whose all edges are undirected. This is the root interface of all
45  * undirected graphs.
46  *
47  * <p>See <a HREF="http://mathworld.wolfram.com/Graph.html">
48  * http://mathworld.wolfram.com/Graph.html</a> for more on undirected and on
49  * directed graphs.</p>
50  *
51  * @author Barak Naveh
52  * @since Jul 14, 2003
53  */
54 public interface UndirectedGraph<V, E>
55     extends Graph<V, E>
56 {
57
58     //~ Methods ---------------------------------------------------------------
59
60     /**
61      * Returns the degree of the specified vertex. A degree of a vertex in an
62      * undirected graph is the number of edges touching that vertex.
63      *
64      * @param vertex vertex whose degree is to be calculated.
65      *
66      * @return the degree of the specified vertex.
67      */
68     public int degreeOf(V vertex);
69 }
70
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