01: // ============================================================================
02: // $Id: GenerateUnary.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: 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 © 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() {
62: return _gen;
63: }
64:
65: /**
66: * Returns the results of invoking the generator. The argument is ignored.
67: */
68: public R fn(T arg) {
69: return _gen.gen();
70: }
71:
72: /**
73: * Calls the Visitor's <code>visit(GenerateUnary)</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 GenerateUnary.Visitor)
78: ((GenerateUnary.Visitor) v).visit(this );
79: else
80: v.visit(this );
81: }
82:
83: // Object overrides
84:
85: public String toString() {
86: return _gen.toString();
87: }
88:
89: // Acyclic Visitor
90:
91: /**
92: * Interface for classes that may interpret a <b>GenerateUnary</b>
93: * functor.
94: */
95: public interface Visitor extends net.sf.jga.fn.Visitor {
96: public void visit(GenerateUnary host);
97: }
98: }
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