1 /*
2 * Copyright 2010 Werner Guttmann
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14 package org.exolab.castor.util;
15
16 import java.util.regex.Pattern;
17 import java.util.regex.PatternSyntaxException;
18
19 /**
20 * An implementation of {@link RegExpEvaluator} that uses the Java Regular Expression library.
21 *
22 * @author <a href="mailto:george76@hotmail.com">George Varghese</a>
23 * @since 1.3.2
24 **/
25 public class SunRegExpEvaluator implements RegExpEvaluator {
26
27 /**
28 * The Regular expression
29 **/
30 private Pattern _pattern;
31
32 /**
33 * Sets the regular expression to match against during a call to #matches
34 *
35 * @param rexpr the regular expression
36 **/
37 public void setExpression(String rexpr) {
38
39 if (rexpr != null) {
40 try {
41 // -- patch and compile expression
42 _pattern = Pattern.compile(rexpr);
43 } catch (PatternSyntaxException ex) {
44 String err = "RegExp Syntax error: ";
45 err += ex.getMessage();
46 err += " ; error occured with the following " + "regular expression: " + rexpr;
47
48 throw new IllegalArgumentException(err, ex);
49 }
50 }
51 }
52
53 /**
54 * Returns true if the given String is matched by the regular expression of this RegExpEvaluator
55 *
56 * @param value the String to check the production of
57 * @return true if the given string matches the regular expression of this RegExpEvaluator
58 * @see #setExpression
59 **/
60 public boolean matches(String value) {
61 if (_pattern != null) {
62 return _pattern.matcher(value).matches();
63 }
64 return true;
65 }
66
67 }
68