1 /**
2 * This file is part of the equanda project.
3 *
4 * The contents of this file are subject to the Mozilla Public License Version 1.1 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
7 *
8 * Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF
9 * ANY KIND, either express or implied. See the License for the specific language governing rights and
10 * limitations under the License.
11 *
12 * Alternatively, the contents of this file may be used under the terms of
13 * either the GNU General Public License Version 2 or later (the "GPL"), or
14 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
15 * in which case the provisions of the GPL or the LGPL are applicable instead
16 * of those above. If you wish to allow use of your version of this file only
17 * under the terms of either the GPL or the LGPL, and not to allow others to
18 * use your version of this file under the terms of the MPL, indicate your
19 * decision by deleting the provisions above and replace them with the notice
20 * and other provisions required by the GPL or the LGPL. If you do not delete
21 * the provisions above, a recipient may use your version of this file under
22 * the terms of any one of the MPL, the GPL or the LGPL.
23 */
24
25 package org.equanda.tapestry5.translators;
26
27 import org.apache.tapestry5.*;
28 import org.apache.tapestry5.services.FormSupport;
29
30 /**
31 * Tapestry translator for double values, assures both point or comma can be used as decimal separator.
32 *
33 * @author <a href="mailto:joachim@progs.be">Joachim Van der Auwera</a>
34 */
35 public class DoubleTranslator
36 implements Translator<Double>, FieldTranslator<Double>
37 {
38 /**
39 * Parses blank values to null, otherwise parses the client value to a double
40 *
41 * @throws ValidationException if the clientValue can not be parsed
42 */
43 public Double parseClient( Field field, String clientValue, String message )
44 throws ValidationException
45 {
46 if ( clientValue == null || clientValue.length() == 0 ) return null;
47 clientValue = clientValue.trim();
48 if ( clientValue.length() == 0 ) return null;
49
50 try
51 {
52 return new Double( clientValue.replace( ',', '.' ).trim() );
53 }
54 catch ( NumberFormatException ex )
55 {
56 throw new ValidationException( message );
57 }
58 }
59
60 /**
61 * Converts null to the blank string, non-null to a string representation.
62 */
63 public String toClient( Double value )
64 {
65 return value == null ? "" : value.toString();
66 }
67
68 public Class<Double> getType() { return Double.class; }
69
70 public String getName()
71 {
72 return "double";
73 }
74
75 public String getMessageKey()
76 {
77 return "number-format-exception";
78 }
79
80 public void render( Field field, String message, MarkupWriter markupWriter, FormSupport formSupport )
81 {
82 formSupport.addValidation( field, "decimalnumber", message, null );
83 }
84
85 public Double parse( String clientValue )
86 throws ValidationException
87 {
88 return parseClient( null, clientValue, "Not parseable by DoubleTranslator" );
89 }
90
91 public void render( MarkupWriter markupWriter )
92 {
93 // @todo don't know what to do here
94 }
95 }