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19  
20  package org.apache.james.transport.matchers;
21  
22  import org.apache.mailet.GenericMatcher;
23  import org.apache.mailet.Mail;
24  
25  import java.util.Collection;
26  
27  /***
28   * use: <mailet match="HasHeader=<header>" class="..." />
29   *
30   * This matcher simply checks to see if the header named is present.
31   * If complements the AddHeader mailet.
32   *
33   * TODO: support lists of headers and values, e.g, match="{<header>[=value]}+"
34   *       [will require a complete rewrite from the current trivial one-liner]
35   *
36   */
37  public class HasHeader extends GenericMatcher {
38  
39      public Collection match(Mail mail) throws javax.mail.MessagingException {
40          return (mail.getMessage().getHeader(getCondition(), null) != null) ? mail.getRecipients() : null;
41      }
42  }
43