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