View Javadoc

1   /************************************************************************
2    * Copyright (c) 2000-2006 The Apache Software Foundation.             *
3    * All rights reserved.                                                *
4    * ------------------------------------------------------------------- *
5    * Licensed under the Apache License, Version 2.0 (the "License"); you *
6    * may not use this file except in compliance with the License. You    *
7    * may obtain a copy of the License at:                                *
8    *                                                                     *
9    *     http://www.apache.org/licenses/LICENSE-2.0                      *
10   *                                                                     *
11   * Unless required by applicable law or agreed to in writing, software *
12   * distributed under the License is distributed on an "AS IS" BASIS,   *
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or     *
14   * implied.  See the License for the specific language governing       *
15   * permissions and limitations under the License.                      *
16   ***********************************************************************/
17  
18  package org.apache.james.transport.matchers;
19  
20  import org.apache.mailet.RFC2822Headers;
21  import org.apache.mailet.GenericMatcher;
22  import org.apache.mailet.Mail;
23  import org.apache.oro.text.regex.MalformedPatternException;
24  import org.apache.oro.text.regex.Pattern;
25  import org.apache.oro.text.regex.Perl5Compiler;
26  import org.apache.oro.text.regex.Perl5Matcher;
27  
28  import javax.mail.MessagingException;
29  import javax.mail.internet.MimeMessage;
30  import java.util.Collection;
31  
32  /***
33   * This is a generic matcher that uses regular expressions.  If any of
34   * the regular expressions match, the matcher is considered to have
35   * matched.  This is an abstract class that must be subclassed to feed
36   * patterns.  Patterns are provided by calling the compile method.  A
37   * subclass will generally call compile() once during init(), but it
38   * could subclass match(), and call it as necessary during message
39   * processing (e.g., if a file of expressions changed). 
40   *
41   * @
42   */
43  
44  abstract public class GenericRegexMatcher extends GenericMatcher {
45      protected Object[][] patterns;
46  
47      public void compile(Object[][] patterns) throws MalformedPatternException {
48          // compile a bunch of regular expressions
49          this.patterns = patterns;
50          for (int i = 0; i < patterns.length; i++) {
51              String pattern = (String)patterns[i][1];
52              patterns[i][1] = new Perl5Compiler().compile(pattern, Perl5Compiler.READ_ONLY_MASK | Perl5Compiler.SINGLELINE_MASK);
53          }
54      }
55  
56      abstract public void init() throws MessagingException;
57  
58      public Collection match(Mail mail) throws MessagingException {
59          MimeMessage message = mail.getMessage();
60          Perl5Matcher matcher = new Perl5Matcher();
61  
62          //Loop through all the patterns
63          if (patterns != null) for (int i = 0; i < patterns.length; i++) {
64              //Get the header name
65              String headerName = (String)patterns[i][0];
66              //Get the patterns for that header
67              Pattern pattern = (Pattern)patterns[i][1];
68              //Get the array of header values that match that
69              String headers[] = message.getHeader(headerName);
70              //Loop through the header values
71              if (headers != null) for (int j = 0; j < headers.length; j++) {
72                  if (matcher.matches(headers[j], pattern)) {
73                      // log("Match: " + headerName + "[" + j + "]: " + headers[j]);
74                      return mail.getRecipients();
75                  }
76                  //log("       " + headerName + "[" + j + "]: " + headers[j]);
77              }
78          }
79          return null;
80      }
81  }