1 /***
2 * Redistribution and use of this software and associated documentation
3 * ("Software"), with or without modification, are permitted provided
4 * that the following conditions are met:
5 *
6 * 1. Redistributions of source code must retain copyright
7 * statements and notices. Redistributions must also contain a
8 * copy of this document.
9 *
10 * 2. Redistributions in binary form must reproduce the
11 * above copyright notice, this list of conditions and the
12 * following disclaimer in the documentation and/or other
13 * materials provided with the distribution.
14 *
15 * 3. The name "Exolab" must not be used to endorse or promote
16 * products derived from this Software without prior written
17 * permission of Exoffice Technologies. For written permission,
18 * please contact info@exolab.org.
19 *
20 * 4. Products derived from this Software may not be called "Exolab"
21 * nor may "Exolab" appear in their names without prior written
22 * permission of Exoffice Technologies. Exolab is a registered
23 * trademark of Exoffice Technologies.
24 *
25 * 5. Due credit should be given to the Exolab Project
26 * (http://www.exolab.org/).
27 *
28 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
29 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
30 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
31 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
32 * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
33 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
34 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
35 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
39 * OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Copyright 2000,2001 (C) Exoffice Technologies Inc. All Rights Reserved.
42 */
43
44 package org.exolab.jms.selector;
45
46
47 /***
48 * This class is an adapter for the Double type.
49 *
50 * @version $Revision: 1.1 $ $Date: 2004/11/26 01:50:44 $
51 * @author <a href="mailto:tima@intalio.com">Tim Anderson</a>
52 * @see SNumber
53 */
54 final class SDouble extends SNumber {
55
56 /***
57 * The wrapped value
58 */
59 private final double _value;
60
61 /***
62 * Construct a new <code>SDouble</code>, initialised to <code>0</code>
63 */
64 public SDouble() {
65 _value = 0;
66 }
67
68 /***
69 * Construct a new <code>SDouble</code>
70 *
71 * @param value the underlying value
72 */
73 public SDouble(final double value) {
74 _value = value;
75 }
76
77 /***
78 * Returns the addition of a number to this
79 *
80 * @param number the number to add
81 * @return the value of <code>this + number<code>
82 */
83 public SNumber add(final SNumber number) {
84 return new SDouble(_value + number.getDouble());
85 }
86
87 /***
88 * Returns the value of the substraction of a number from this
89 *
90 * @param number the number to subtract
91 * @return the value of <code>this - number<code>
92 */
93 public SNumber subtract(final SNumber number) {
94 return new SDouble(_value - number.getDouble());
95 }
96
97 /***
98 * Returns the multiplication of a number to this
99 *
100 * @param number the number to multiply
101 * @return the value of <code>this * number<code>
102 */
103 public SNumber multiply(final SNumber number) {
104 return new SDouble(_value * number.getDouble());
105 }
106
107 /***
108 * Returns the division of a number from this
109 *
110 * @param number the number to divide
111 * @return the value of <code>this / number<code>
112 */
113 public SNumber divide(final SNumber number) {
114 SNumber result = null;
115 try {
116 result = new SDouble(_value / number.getDouble());
117 } catch (ArithmeticException ignore) {
118 }
119 return result;
120 }
121
122 /***
123 * Returns the value of this as a <code>long</code>
124 *
125 * @return the value of this as a <code>long</code>
126 */
127 public long getLong() {
128 return (long) _value;
129 }
130
131 /***
132 * Returns the value of this as a <code>double</code>
133 *
134 * @return the value of this as a <code>double</code>
135 */
136 public double getDouble() {
137 return _value;
138 }
139
140 /***
141 * Returns the value of this, wrapped in a <code>Double</code>
142 *
143 * @return the value of this, wrapped in a <code>Double</code>
144 */
145 public Object getObject() {
146 return new Double(_value);
147 }
148
149 /***
150 * Determines if this is equal to another object.
151 *
152 * @param obj the object to compare. An instance of <code>SNumber</code>
153 * @return <code>SBool.TRUE</code> if <code>this = obj</code>, otherwise
154 * <code>SBool.FALSE</code>
155 */
156 public SBool equal(final SObject obj) {
157 SBool result = SBool.FALSE;
158 double rhs = ((SNumber) obj).getDouble();
159 if (_value == rhs) {
160 result = SBool.TRUE;
161 }
162 return result;
163 }
164
165 /***
166 * Determines if this is less than another object.
167 *
168 * @param obj the object to compare. An instance of <code>SNumber</code>
169 * @return <code>SBool.TRUE</code> if <code>this < obj</code>, otherwise
170 * <code>SBool.FALSE</code>
171 */
172 public SBool less(final SObject obj) {
173 SBool result = SBool.FALSE;
174 double rhs = ((SNumber) obj).getDouble();
175 if (_value < rhs) {
176 result = SBool.TRUE;
177 }
178 return result;
179 }
180
181 /***
182 * Determines if this is greater than another object.
183 *
184 * @param obj the object to compare. An instance of <code>SNumber</code>
185 * @return <code>SBool.TRUE</code> if <code>this > obj</code>, otherwise
186 * <code>SBool.FALSE</code>
187 */
188 public SBool greater(final SObject obj) {
189 SBool result = SBool.FALSE;
190 double rhs = ((SNumber) obj).getDouble();
191 if (_value > rhs) {
192 result = SBool.TRUE;
193 }
194 return result;
195 }
196
197 }