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19
20
21
22 package org.apache.james.transport.matchers;
23
24 import org.apache.mailet.base.GenericMatcher;
25 import org.apache.mailet.Mail;
26 import org.apache.oro.text.regex.MalformedPatternException;
27 import org.apache.oro.text.regex.Pattern;
28 import org.apache.oro.text.regex.Perl5Compiler;
29 import org.apache.oro.text.regex.Perl5Matcher;
30
31 import javax.mail.MessagingException;
32 import javax.mail.internet.MimeMessage;
33 import java.util.Collection;
34
35 /**
36 * This is a generic matcher that uses regular expressions. If any of
37 * the regular expressions match, the matcher is considered to have
38 * matched. This is an abstract class that must be subclassed to feed
39 * patterns. Patterns are provided by calling the compile method. A
40 * subclass will generally call compile() once during init(), but it
41 * could subclass match(), and call it as necessary during message
42 * processing (e.g., if a file of expressions changed).
43 *
44 *
45 */
46
47 abstract public class GenericRegexMatcher extends GenericMatcher {
48 protected Object[][] patterns;
49
50 public void compile(Object[][] patterns) throws MalformedPatternException {
51 // compile a bunch of regular expressions
52 this.patterns = patterns;
53 for (int i = 0; i < patterns.length; i++) {
54 String pattern = (String)patterns[i][1];
55 patterns[i][1] = new Perl5Compiler().compile(pattern, Perl5Compiler.READ_ONLY_MASK | Perl5Compiler.SINGLELINE_MASK);
56 }
57 }
58
59 /**
60 * @see org.apache.mailet.GenericMatcher#GenericMatcher()
61 */
62 abstract public void init() throws MessagingException;
63
64 /**
65 * @see org.apache.mailet.GenericMatcher#match(Mail)
66 */
67 public Collection match(Mail mail) throws MessagingException {
68 MimeMessage message = mail.getMessage();
69 Perl5Matcher matcher = new Perl5Matcher();
70
71 //Loop through all the patterns
72 if (patterns != null) for (int i = 0; i < patterns.length; i++) {
73 //Get the header name
74 String headerName = (String)patterns[i][0];
75 //Get the patterns for that header
76 Pattern pattern = (Pattern)patterns[i][1];
77 //Get the array of header values that match that
78 String headers[] = message.getHeader(headerName);
79 //Loop through the header values
80 if (headers != null) for (int j = 0; j < headers.length; j++) {
81 if (matcher.matches(headers[j], pattern)) {
82 // log("Match: " + headerName + "[" + j + "]: " + headers[j]);
83 return mail.getRecipients();
84 }
85 //log(" " + headerName + "[" + j + "]: " + headers[j]);
86 }
87 }
88 return null;
89 }
90 }