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Java > Open Source Codes > net > sf > jga > fn > adaptor > Project1st


1 // ============================================================================
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// $Id: Project1st.java,v 1.7 2006/01/08 00:52:25 davidahall Exp $
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// Copyright (c) 2002-2005 David A. Hall
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// ============================================================================
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// The contents of this file are subject to the Common Development and
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// Distribution License (CDDL), Version 1.0 (the License); you may not use this
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// file except in compliance with the License. You should have received a copy
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// of the the License along with this file: if not, a copy of the License is
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// available from Sun Microsystems, Inc.
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//
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// http://www.sun.com/cddl/cddl.html
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//
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// From time to time, the license steward (initially Sun Microsystems, Inc.) may
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// publish revised and/or new versions of the License. You may not use,
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// distribute, or otherwise make this file available under subsequent versions
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// of the License.
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//
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// Alternatively, the contents of this file may be used under the terms of the
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// GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which
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// case the provisions of the LGPL are applicable instead of those above. If you
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// wish to allow use of your version of this file only under the terms of the
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// LGPL, and not to allow others to use your version of this file under the
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// terms of the CDDL, indicate your decision by deleting the provisions above
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// and replace them with the notice and other provisions required by the LGPL.
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// If you do not delete the provisions above, a recipient may use your version
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// of this file under the terms of either the CDDL or the LGPL.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// ============================================================================
32

33 package net.sf.jga.fn.adaptor;
34
35 import net.sf.jga.fn.BinaryFunctor;
36     
37 /**
38  * Binary Functor that returns the first of two runtime arguments.
39  * <p>
40  * Copyright &copy; 2002-2005 David A. Hall
41  *
42  * @author <a HREF="mailto:davidahall@users.sourceforge.net">David A. Hall</a>
43  */

44
45 public class Project1st<T1,T2> extends BinaryFunctor<T1,T2,T1> {
46
47     static final long serialVersionUID = 7094219799679186200L;
48
49     // BinaryFunctor interface
50

51     /**
52      * Given two arguments, returns the first. The second argument is not
53      * evaluated in any way by this predicate.
54      *
55      * @return x
56      */

57     public T1 fn(T1 x, T2 unused) {
58         return x;
59     }
60
61     /**
62      * Calls the Visitor's <code>visit(Project1st)</code> method, if it
63      * implements the nested Visitor interface.
64      */

65     public void accept(net.sf.jga.fn.Visitor v) {
66         if (v instanceof Project1st.Visitor)
67             ((Project1st.Visitor)v).visit(this);
68         else
69             v.visit(this);
70     }
71     
72     // Object overrides
73

74     public String JavaDoc toString() {
75         return "Project1st";
76     }
77     
78      // AcyclicVisitor
79

80     /**
81      * Interface for classes that may interpret an <b>Project1st</b> functor.
82      */

83     public interface Visitor extends net.sf.jga.fn.Visitor {
84         public void visit(Project1st host);
85     }
86 }
87         
88
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