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Java > Open Source Codes > net > sf > jga > fn > arithmetic > ArithmeticFactory


1 // ============================================================================
2 // $Id: ArithmeticFactory.java,v 1.8 2005/08/02 23:45:05 davidahall Exp $
3 // Copyright (c) 2003-2005 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.arithmetic;
34
35 import java.math.BigDecimal JavaDoc;
36 import java.math.BigInteger JavaDoc;
37 import java.util.HashMap JavaDoc;
38
39 /**
40  * Builds and distributes implementations of the Arithmetic and
41  * IntegerArithmetic interfaces that are available for supported Number
42  * classes.
43  * <p>
44  * Copyright &copy; 2003-2005 David A. Hall
45  *
46  * @author <a HREF="mailto:davidahall@users.sourceforge.net">David A. Hall</a>
47  */
48
49 public class ArithmeticFactory {
50     static private HashMap JavaDoc<Class JavaDoc<? extends Number JavaDoc>,Arithmetic<? extends Number JavaDoc>>
51         _arithmeticMap = new HashMap JavaDoc<Class JavaDoc<? extends Number JavaDoc>,Arithmetic<? extends Number JavaDoc>>();
52     
53     static private HashMap JavaDoc<Class JavaDoc<? extends Number JavaDoc>,IntegerArithmetic<? extends Number JavaDoc>>
54         _integralMap = new HashMap JavaDoc<Class JavaDoc<? extends Number JavaDoc>,IntegerArithmetic<? extends Number JavaDoc>>();
55
56     /**
57      * Registers the Arithmetic implementation for the given class
58      */
59     static public <T extends Number JavaDoc> void register (Class JavaDoc<T> c, Arithmetic<T> math) {
60         _arithmeticMap.put(c, math);
61     }
62     
63     /**
64      * Registers the IntegerArithmetic implementation for the given class
65      */
66     static public <T extends Number JavaDoc> void register (Class JavaDoc<T> c, IntegerArithmetic<T> math) {
67         _arithmeticMap.put(c, math);
68         _integralMap.put(c, math);
69     }
70
71     /**
72      * Returns the Arithmetic implementation registered for the given class
73      * @return the Arithmetic implementation registered for the given class
74      */
75     static public <T extends Number JavaDoc> Arithmetic<T> getArithmetic (Class JavaDoc<T> c) {
76         // @SuppressWarnings
77 // the map is private, and the register methods ensure that the specific
78 // runtime type of each implementation is associated with the correct
79 // class.
80 return (Arithmetic<T>) _arithmeticMap.get(c);
81     }
82     
83     /**
84      * Returns the IntegerArithmetic implementation registered for the given
85      * class
86      * @return the IntegerArithmetic implementation registered for the given
87      * class
88      */
89     static public <T extends Number JavaDoc> IntegerArithmetic<T> getIntegralArithmetic (Class JavaDoc<T> c) {
90         // @SuppressWarnings
91 // the map is private, and the register methods ensure that the specific
92 // runtime type of each implementation is associated with the correct
93 // class.
94 return (IntegerArithmetic<T>) _integralMap.get(c);
95     }
96     
97     static {
98         register(Byte JavaDoc.class, new ByteMath());
99         register(Short JavaDoc.class, new ShortMath());
100         register(Integer JavaDoc.class, new IntegerMath());
101         register(Long JavaDoc.class, new LongMath());
102         register(Float JavaDoc.class, new FloatMath());
103         register(Double JavaDoc.class, new DoubleMath());
104         register(BigDecimal JavaDoc.class, new DecimalMath());
105         register(BigInteger JavaDoc.class, new BigIntMath());
106     }
107 }
108
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