NameMatchesComponentPointcut


1   /*****************************************************************************
2    * Copyright (c) PicoContainer Organization. All rights reserved.            *
3    * ------------------------------------------------------------------------- *
4    * The software in this package is published under the terms of the BSD      *
5    * style license a copy of which has been included with this distribution in *
6    * the LICENSE.txt file.                                                     *
7    *                                                                           *
8    * Idea by Rachel Davies, Original code by various                           *
9    *****************************************************************************/
10  package org.nanocontainer.aop.defaults;
11  
12  import org.apache.oro.text.regex.MalformedPatternException;
13  import org.apache.oro.text.regex.Pattern;
14  import org.apache.oro.text.regex.Perl5Compiler;
15  import org.apache.oro.text.regex.Perl5Matcher;
16  import org.nanocontainer.aop.ComponentPointcut;
17  import org.nanocontainer.aop.MalformedRegularExpressionException;
18  
19  /**
20   * Component pointcut that matches the component name against a regular
21   * expression.
22   *
23   * @author Stephen Molitor
24   * @version $Revision: 3144 $
25   */
26  public class NameMatchesComponentPointcut implements ComponentPointcut {
27  
28      private final Pattern pattern;
29      private final Perl5Matcher matcher = new Perl5Matcher();
30  
31      /**
32       * Creates a new <code>NameMatchesComponentPointcut</code> that will match
33       * the component key against the given regular expression. The regular
34       * expression must be an <a
35       * HREF="http://jakarta.apache.org/oro/index.html">ORO </a> Perl5 regular
36       * expression.
37       *
38       * @param regex the regular expression to match against the component name.
39       * @throws org.nanocontainer.aop.MalformedRegularExpressionException
40       *          if the regular expression is
41       *          invalid.
42       */
43      public NameMatchesComponentPointcut(String   regex) throws MalformedRegularExpressionException {
44          Perl5Compiler compiler = new Perl5Compiler();
45          try {
46              pattern = compiler.compile(regex);
47          } catch (MalformedPatternException e) {
48              throw new MalformedRegularExpressionException("malformed component name regular expression", e);
49          }
50      }
51  
52      /**
53       * Tests to see if the component key's toString() value matches the regular expression passed
54       * to the constructor.
55       *
56       * @param componentKey the component key to match against.
57       * @return true if the regular expression passed to the constructor matches
58       *         against <code>componentKey</code>, else false.
59       */
60      public boolean picks(Object   componentKey) {
61          String   componentName = (String  ) componentKey.toString();
62          return matcher.contains(componentName, pattern);
63      }
64  
65  }
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