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Java > Open Source Codes > org > jgrapht > generate > EmptyGraphGenerator


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  * EmptyGraphGenerator.java
27  * -------------------
28  * (C) Copyright 2003-2006, by John V. Sichi and Contributors.
29  *
30  * Original Author: John V. Sichi
31  * Contributor(s): -
32  *
33  * $Id: EmptyGraphGenerator.java 504 2006-07-03 02:37:26Z perfecthash $
34  *
35  * Changes
36  * -------
37  * 16-Sep-2003 : Initial revision (JVS);
38  *
39  */
40 package org.jgrapht.generate;
41
42 import java.util.*;
43
44 import org.jgrapht.*;
45
46
47 /**
48  * Generates an <a HREF="http://mathworld.wolfram.com/EmptyGraph.html">empty
49  * graph</a> of any size. An empty graph is a graph that has no edges.
50  *
51  * @author John V. Sichi
52  * @since Sep 16, 2003
53  */
54 public class EmptyGraphGenerator<V, E>
55     implements GraphGenerator<V, E, V>
56 {
57
58     //~ Instance fields -------------------------------------------------------
59
60     private int size;
61
62     //~ Constructors ----------------------------------------------------------
63
64     /**
65      * Construct a new EmptyGraphGenerator.
66      *
67      * @param size number of vertices to be generated
68      *
69      * @throws IllegalArgumentException if the specified size is negative.
70      */
71     public EmptyGraphGenerator(int size)
72     {
73         if (size < 0) {
74             throw new IllegalArgumentException JavaDoc("must be non-negative");
75         }
76
77         this.size = size;
78     }
79
80     //~ Methods ---------------------------------------------------------------
81
82     /**
83      * {@inheritDoc}
84      */
85     public void generateGraph(
86         Graph<V, E> target,
87         VertexFactory<V> vertexFactory,
88         Map<String JavaDoc, V> resultMap)
89     {
90         for (int i = 0; i < size; ++i) {
91             target.addVertex(vertexFactory.createVertex());
92         }
93     }
94 }
95
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