1 /*
2 * Scope: a generic MVC framework.
3 * Copyright (c) 2000-2002, The Scope team
4 * All rights reserved.
5 *
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * Neither the name "Scope" nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR
27 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 *
36 * $Id: BigDecimalStringConvertor.java,v 1.4 2002/09/05 15:41:46 ludovicc Exp $
37 */
38 package org.scopemvc.util.convertor;
39
40
41 import java.math.BigDecimal;
42 import java.text.DecimalFormatSymbols;
43
44 /***
45 * String convertor for type <code>BigDecimal</code>.
46 *
47 * @author <A HREF="mailto:danmi@users.sourceforge.net">Daniel Michalik</A>
48 * @created 05 September 2002
49 * @version $Revision: 1.4 $ $Date: 2002/09/05 15:41:46 $
50 */
51 public class BigDecimalStringConvertor extends NullStringConvertor {
52
53 private DecimalFormatSymbols symbols = new DecimalFormatSymbols();
54 private boolean convertDot;
55
56
57 /***
58 * Constructor for the BigDecimalStringConvertor object
59 */
60 public BigDecimalStringConvertor() {
61 convertDot = (symbols.getDecimalSeparator() == '.');
62 }
63
64 /***
65 * Returns parsed number as object of type <code>BigDecimal</code>. <p>
66 *
67 * Note: for parsing is not used NumberFormat, but BigDecimal constructor.
68 * Passed String argument is changed from format with locale decimal
69 * separator into format recognizable by the constructor. </p>
70 *
71 * @param inString TODO: Describe the Parameter
72 * @return TODO: Describe the Return Value
73 * @throws IllegalArgumentException can't convert from String.
74 */
75 public Object stringAsValue(String inString) throws IllegalArgumentException {
76 // Note: default BigDecimal(String ) constructor is not correct because
77 // it does not deal with locales. For example in Czech locale
78 // decimal numbers are written with coma, not with dot (i.e. "3,1415"),
79 // which leads BigDecimal's constructor to throw exceptions.
80 // That is why we perform some correction first.
81
82 if (isNull(inString)) {
83 return null;
84 }
85 String newString = convertDot ? inString.replace(
86 symbols.getDecimalSeparator(), '.')
87 : inString;
88 try {
89 Object result = new BigDecimal(newString);
90 return result;
91 } catch (NumberFormatException ex) {
92 throw new IllegalArgumentException("Illegal value: "
93 + ex.getMessage());
94 }
95 }
96
97
98 /***
99 * @param inValue TODO: Describe the Parameter
100 * @return text representation of numeric object. For null argument is
101 * called method {@link #getNullAsString() getNullAsString}
102 * @throws IllegalArgumentException when argument is not subclass of
103 * java.lang.Number
104 */
105 public String valueAsString(Object inValue) throws IllegalArgumentException {
106 if (inValue == null) {
107 return getNullAsString();
108 }
109 if (!(inValue instanceof BigDecimal)) {
110 throw new IllegalArgumentException("Passed object is not BigDecimal");
111 }
112 BigDecimal d = (BigDecimal) inValue;
113 return convertDot ?
114 d.toString().replace('.', symbols.getDecimalSeparator())
115 : d.toString();
116 }
117 }
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