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Java > Open Source Codes > org > jgrapht > experimental > isomorphism > IntegerVertexFactory


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  * IntegerVertexFactory.java
27  * -----------------
28  * (C) Copyright 2005-2006, by Assaf Lehr and Contributors.
29  *
30  * Original Author: Assaf Lehr
31  * Contributor(s): -
32  *
33  * $Id: IntegerVertexFactory.java 504 2006-07-03 02:37:26Z perfecthash $
34  *
35  * Changes
36  * -------
37  */
38 package org.jgrapht.experimental.isomorphism;
39
40 import org.jgrapht.*;
41
42
43 /**
44  * Implements createVertex() by producing a sequence of Integers; their values
45  * start with the successor to the constructor value.
46  *
47  * <p>for example : IntegerVertexFactory(10); the first createVertex() will
48  * return Integer=11
49  *
50  * @author Assaf
51  * @since May 25, 2005
52  */
53 public class IntegerVertexFactory
54     implements VertexFactory<Integer JavaDoc>
55 {
56
57     //~ Instance fields -------------------------------------------------------
58
59     private int counter;
60
61     //~ Constructors ----------------------------------------------------------
62
63     /**
64      * Equivalent to IntegerVertexFactory(0);
65      *
66      * @author Assaf
67      * @since Aug 6, 2005
68      */
69     public IntegerVertexFactory()
70     {
71         this(0);
72     }
73
74     public IntegerVertexFactory(int oneBeforeFirstValue)
75     {
76         this.counter = oneBeforeFirstValue;
77     }
78
79     //~ Methods ---------------------------------------------------------------
80
81     public Integer JavaDoc createVertex()
82     {
83         this.counter++;
84         return new Integer JavaDoc(this.counter);
85     }
86 }
87
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