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


1 // ============================================================================
2 // $Id: GenerateUnary.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 import net.sf.jga.fn.UnaryFunctor;
37
38 /**
39  * UnaryFunctor that returns the result of a nested Generator. The argument
40  * to the UnaryFunctor is ignored.
41  * <p>
42  * Copyright &copy; 2004-2005 David A. Hall
43  * @author <a HREF="mailto:davidahall@users.sf.net">David A. Hall</a>
44  */
45
46 public class GenerateUnary<T,R> extends UnaryFunctor<T,R> {
47     
48     static final long serialVersionUID = 2928255703029297803L;
49     
50     // The Nested Generator
51 private Generator<R> _gen;
52     
53     public GenerateUnary(Generator<R> gen) {
54         _gen = gen;
55     }
56
57     /**
58      * Returns the generator whose results are returned.
59      */
60
61     public Generator<R> getGenerator() { return _gen; }
62     
63     /**
64      * Returns the results of invoking the generator. The argument is ignored.
65      */
66     public R fn(T arg) {
67         return _gen.gen();
68     }
69     
70     /**
71      * Calls the Visitor's <code>visit(GenerateUnary)</code> method, if it
72      * implements the nested Visitor interface.
73      */
74     public void accept(net.sf.jga.fn.Visitor v) {
75         if (v instanceof GenerateUnary.Visitor)
76             ((GenerateUnary.Visitor)v).visit(this);
77         else
78             v.visit(this);
79     }
80
81     // Object overrides
82
83     public String JavaDoc toString() {
84         return _gen.toString();
85     }
86     
87     // Acyclic Visitor
88
89     /**
90      * Interface for classes that may interpret a <b>GenerateUnary</b>
91      * functor.
92      */
93     public interface Visitor extends net.sf.jga.fn.Visitor {
94         public void visit(GenerateUnary host);
95     }
96 }
97
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