01: // ============================================================================
02: // $Id: Random.java,v 1.6 2006/01/08 00:52:25 davidahall Exp $
03: // Copyright (c) 2004-2005 David A. Hall
04: // ============================================================================
05: // The contents of this file are subject to the Common Development and
06: // Distribution License (CDDL), Version 1.0 (the License); you may not use this
07: // file except in compliance with the License. You should have received a copy
08: // of the the License along with this file: if not, a copy of the License is
09: // 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 © 2004-2005 David A. Hall
42: *
43: * @author <a href="mailto:davidahall@users.sourceforge.net">David A. Hall</a>
44: */
45:
46: // UNTESTED
47: public class Random extends Generator<Double> {
48:
49: static final long serialVersionUID = 8333040240099165144L;
50:
51: // Generator interface
52:
53: /**
54: * Returns a pseudorandom value, using Math.random().
55: * @return a pseudorandom value
56: */
57:
58: public Double gen() {
59: return new Double(Math.random());
60: }
61:
62: /**
63: * Calls the Visitor's <code>visit(Random)</code> method, if it
64: * implements the nested Visitor interface.
65: */
66: public void accept(net.sf.jga.fn.Visitor v) {
67: if (v instanceof Random.Visitor)
68: ((Random.Visitor) v).visit(this );
69: else
70: v.visit(this );
71: }
72:
73: // Object overrides
74:
75: public String toString() {
76: return "Random()";
77: }
78:
79: // AcyclicVisitor
80:
81: /**
82: * Interface for classes that may interpret a <b>Random</b> generator.
83: */
84: public interface Visitor extends net.sf.jga.fn.Visitor {
85: public void visit(Random host);
86: }
87: }
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