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1   /**
2    * Redistribution and use of this software and associated documentation ("Software"), with or
3    * without modification, are permitted provided that the following conditions are met:
4    *
5    * 1. Redistributions of source code must retain copyright statements and notices. Redistributions
6    * must also contain a copy of this document.
7    *
8    * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
9    * conditions and the following disclaimer in the documentation and/or other materials provided with
10   * the distribution.
11   *
12   * 3. The name "Exolab" must not be used to endorse or promote products derived from this Software
13   * without prior written permission of Intalio, Inc. For written permission, please contact
14   * info@exolab.org.
15   *
16   * 4. Products derived from this Software may not be called "Exolab" nor may "Exolab" appear in
17   * their names without prior written permission of Intalio, Inc. Exolab is a registered trademark of
18   * Intalio, Inc.
19   *
20   * 5. Due credit should be given to the Exolab Project (http://www.exolab.org/).
21   *
22   * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESSED OR
23   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
24   * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTALIO, INC. OR ITS
25   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
29   * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30   *
31   * Copyright 2000 (C) Intalio, Inc. All Rights Reserved.
32   *
33   * $Id$
34   */
35  
36  package org.exolab.castor.util;
37  
38  import org.apache.regexp.*;
39  import org.castor.core.util.Messages;
40  
41  /**
42   * An implementation of {@link RegExpEvaluator} that uses the Jakarta Regular Expression library.
43   * For more information about the Jakarta RE library please visit:
44   * <a href="http://jakarta.apache.org/regexp/"> http://jakarta.apache.org/regexp/</a>
45   * 
46   * @author <a href="mailto:kvisco@intalio.com">Keith Visco</a>
47   * @version $Revision$ $Date: 2004-02-14 02:16:35 -0700 (Sat, 14 Feb 2004) $
48   */
49  public class JakartaRegExpEvaluator implements RegExpEvaluator {
50  
51    /**
52     * Reguar expression denoting a beginning of line.
53     */
54    private static final String BOL = "^(";
55  
56    /**
57     * Regular expression denoting end of line.
58     */
59    private static final String EOL = ")$";
60  
61    /**
62     * The Regular expression
63     */
64    private RE _regexp;
65  
66    /**
67     * {@inheritDoc}
68     * 
69     * @see org.exolab.castor.util.RegExpEvaluator#setExpression(java.lang.String)
70     */
71    public void setExpression(final String rexpr) {
72  
73      if (rexpr != null) {
74        try {
75          // -- patch and compile expression
76          _regexp = new RE(BOL + rexpr + EOL);
77        } catch (RESyntaxException ex) {
78          String message = Messages.format("regexp.eval.error", rexpr);
79          throw new IllegalArgumentException(message, ex);
80        }
81      } else {
82        _regexp = null;
83      }
84    }
85  
86    /**
87     * {@inheritDoc}
88     * 
89     * @see org.exolab.castor.util.RegExpEvaluator#matches(java.lang.String)
90     */
91    public boolean matches(final String value) {
92      if (_regexp != null) {
93        return _regexp.match(value);
94      }
95      return true;
96    }
97  
98  }