1 /*
2 * $Id: DoubleConverter.java,v 1.2 2004/04/04 18:27:44 eelco12 Exp $
3 * $Revision: 1.2 $
4 * $Date: 2004/04/04 18:27:44 $
5 *
6 * ====================================================================
7 * Copyright (c) 2003, Open Edge B.V.
8 * All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 * Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer. Redistributions
13 * in binary form must reproduce the above copyright notice, this list of
14 * conditions and the following disclaimer in the documentation and/or other
15 * materials provided with the distribution. Neither the name of OpenEdge B.V.
16 * nor the names of its contributors may be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
29 * THE POSSIBILITY OF SUCH DAMAGE.
30 */
31 package nl.openedge.baritus.converters;
32
33 /***
34 * <p>{@link Converter} implementation that converts an incoming
35 * String into a <code>java.lang.Double</code> object,
36 * throwing a {@link ConversionException} if a conversion
37 * error occurs.</p>
38 *
39 * @author Eelco Hillenius
40 */
41
42 public final class DoubleConverter implements Converter
43 {
44
45 /***
46 * Create a {@link Converter} that will throw a {@link ConversionException}
47 * if a conversion error occurs.
48 */
49 public DoubleConverter()
50 {
51
52 }
53
54 /***
55 * Convert the specified input object into an output object of the
56 * specified type.
57 *
58 * @param type Data type to which this value should be converted
59 * @param value The input value to be converted
60 *
61 * @exception ConversionException if conversion cannot be performed
62 * successfully
63 */
64 public Object convert(Class type, Object value)
65 {
66
67 if (value == null)
68 {
69 return null;
70 }
71 else if (value instanceof Double)
72 {
73 return (value);
74 }
75 else if(value instanceof Number)
76 {
77 return new Double(((Number)value).doubleValue());
78 }
79 else
80 {
81 try
82 {
83 return (new Double(value.toString()));
84 }
85 catch (Exception e)
86 {
87 throw new ConversionException(e);
88 }
89 }
90 }
91
92
93 }