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Java > Open Source Codes > net > sf > jga > fn > adaptor > Random


1 // ============================================================================
2 // $Id: Random.java,v 1.6 2006/01/08 00:52:25 davidahall Exp $
3 // Copyright (c) 2004-2005 David A. Hall
4 // ============================================================================
5 // The contents of this file are subject to the Common Development and
6 // Distribution License (CDDL), Version 1.0 (the License); you may not use this
7 // file except in compliance with the License. You should have received a copy
8 // of the the License along with this file: if not, a copy of the License is
9 // available from Sun Microsystems, Inc.
10 //
11 // http://www.sun.com/cddl/cddl.html
12 //
13 // From time to time, the license steward (initially Sun Microsystems, Inc.) may
14 // publish revised and/or new versions of the License. You may not use,
15 // distribute, or otherwise make this file available under subsequent versions
16 // of the License.
17 //
18 // Alternatively, the contents of this file may be used under the terms of the
19 // GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which
20 // case the provisions of the LGPL are applicable instead of those above. If you
21 // wish to allow use of your version of this file only under the terms of the
22 // LGPL, and not to allow others to use your version of this file under the
23 // terms of the CDDL, indicate your decision by deleting the provisions above
24 // and replace them with the notice and other provisions required by the LGPL.
25 // If you do not delete the provisions above, a recipient may use your version
26 // of this file under the terms of either the CDDL or the LGPL.
27 //
28 // This library is distributed in the hope that it will be useful,
29 // but WITHOUT ANY WARRANTY; without even the implied warranty of
30 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
31 // ============================================================================
32
33 package net.sf.jga.fn.adaptor;
34
35 import net.sf.jga.fn.Generator;
36
37 /**
38  * Functor that returns a pseudorandom value using Math.random(). Additional
39  * implementations are left as an exercise...
40  * <p>
41  * Copyright &copy; 2004-2005 David A. Hall
42  *
43  * @author <a HREF="mailto:davidahall@users.sourceforge.net">David A. Hall</a>
44  */
45
46 // UNTESTED
47
48 public class Random extends Generator<Double JavaDoc> {
49     
50     static final long serialVersionUID = 8333040240099165144L;
51     
52     // Generator interface
53
54     /**
55      * Returns a pseudorandom value, using Math.random().
56      * @return a pseudorandom value
57      */
58     
59     public Double JavaDoc gen() {
60         return new Double JavaDoc(Math.random());
61     }
62
63     /**
64      * Calls the Visitor's <code>visit(Random)</code> method, if it
65      * implements the nested Visitor interface.
66      */
67     public void accept(net.sf.jga.fn.Visitor v) {
68         if (v instanceof Random.Visitor)
69             ((Random.Visitor)v).visit(this);
70         else
71             v.visit(this);
72     }
73
74     // Object overrides
75
76     public String JavaDoc toString() {
77         return "Random()";
78     }
79     
80      // AcyclicVisitor
81
82     /**
83      * Interface for classes that may interpret a <b>Random</b> generator.
84      */
85     public interface Visitor extends net.sf.jga.fn.Visitor {
86         public void visit(Random host);
87     }
88 }
89         
90
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