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


1 // ============================================================================
2 // $Id: GenerateBinary.java,v 1.7 2006/08/16 03:04:11 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.BinaryFunctor;
36 import net.sf.jga.fn.Generator;
37 import net.sf.jga.fn.BinaryFunctor;
38
39 /**
40  * BinaryFunctor that returns the result of a nested Generator. The arguments
41  * to the BinaryFunctor are ignored.
42  * <p>
43  * Copyright &copy; 2004-2005 David A. Hall
44  * @author <a HREF="mailto:davidahall@users.sf.net">David A. Hall</a>
45  */
46
47 public class GenerateBinary<T1,T2,R> extends BinaryFunctor<T1,T2,R> {
48     
49     static final long serialVersionUID = -6202505725582800051L;
50     
51     // The Nested Generator
52 private Generator<R> _gen;
53     
54     public GenerateBinary(Generator<R> gen) {
55         _gen = gen;
56     }
57
58     /**
59      * Returns the generator whose results are returned.
60      */
61
62     public Generator<R> getGenerator() { return _gen; }
63     
64     /**
65      * Returns the results of invoking the generator. The arguments are
66      * ignored.
67      */
68     public R fn(T1 arg1, T2 arg2) {
69         return _gen.gen();
70     }
71     
72     /**
73      * Calls the Visitor's <code>visit(GenerateBinary)</code> method, if it
74      * implements the nested Visitor interface.
75      */
76     public void accept(net.sf.jga.fn.Visitor v) {
77         if (v instanceof GenerateBinary.Visitor)
78             ((GenerateBinary.Visitor)v).visit(this);
79         else
80             v.visit(this);
81     }
82
83     // Object overrides
84
85     public String JavaDoc toString() {
86         return _gen.toString();
87     }
88     
89     // Acyclic Visitor
90
91     /**
92      * Interface for classes that may interpret a <b>GenerateBinary</b>
93      * functor.
94      */
95     public interface Visitor extends net.sf.jga.fn.Visitor {
96         public void visit(GenerateBinary host);
97     }
98 }
99
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