1 /***
2 * Copyright (C) 2006 Philipp Mpalampanis
3 *
4 * License: MPL 1.1/GPL 2.0/LGPL 2.1
5 *
6 * The contents of this file are subject to the Mozilla Public License Version
7 * 1.1 (the "License"); you may not use this file except in compliance with
8 * the License. You may obtain a copy of the License at
9 * http://www.mozilla.org/MPL/
10 *
11 * Software distributed under the License is distributed on an "AS IS" basis,
12 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13 * for the specific language governing rights and limitations under the
14 * License.
15 *
16 * Alternatively, the contents of this file may be used under the terms of
17 * either the GNU General Public License Version 2 or later (the "GPL"), or
18 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
19 * in which case the provisions of the GPL or the LGPL are applicable instead
20 * of those above. If you wish to allow use of your version of this file only
21 * under the terms of either the GPL or the LGPL, and not to allow others to
22 * use your version of this file under the terms of the MPL, indicate your
23 * decision by deleting the provisions above and replace them with the notice
24 * and other provisions required by the GPL or the LGPL. If you do not delete
25 * the provisions above, a recipient may use your version of this file under
26 * the terms of any one of the MPL, the GPL or the LGPL.
27 */
28
29 package net.sf.echobinding.validation;
30
31 import java.util.regex.Pattern;
32
33
34 /***
35 * A validator the uses a regular expression to validate user input.
36 *
37 */
38 public class RegexValidator implements Validator {
39
40 private Pattern _pattern;
41 private String _regex;
42
43 /***
44 * Constructs the regular expression validator.
45 *
46 * @param regex - the regular expression to use
47 */
48 public RegexValidator(String regex) {
49 _pattern = Pattern.compile(regex);
50 _regex = regex;
51 }
52
53 /***
54 * Checks if the input string matches the regular expression.
55 *
56 * @param input - the user input
57 */
58 public ValidationReport validate(Object bean, Object input) {
59 if(input == null)
60 return new ValidationReport(true, null);
61
62 boolean matches = _pattern.matcher(input.toString()).matches();
63
64 String message = null;
65 if(!matches)
66 message = "input must match pattern '"+_regex+"'";
67
68 return new ValidationReport(matches, message);
69 }
70
71 }