01: /****************************************************************
02: * Licensed to the Apache Software Foundation (ASF) under one *
03: * or more contributor license agreements. See the NOTICE file *
04: * distributed with this work for additional information *
05: * regarding copyright ownership. The ASF licenses this file *
06: * to you under the Apache License, Version 2.0 (the *
07: * "License"); you may not use this file except in compliance *
08: * with the License. You may obtain a copy of the License at *
09: * *
10: * http://www.apache.org/licenses/LICENSE-2.0 *
11: * *
12: * Unless required by applicable law or agreed to in writing, *
13: * software distributed under the License is distributed on an *
14: * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY *
15: * KIND, either express or implied. See the License for the *
16: * specific language governing permissions and limitations *
17: * under the License. *
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)
38: throws javax.mail.MessagingException {
39: return (mail.getMessage().getHeader(getCondition(), null) != null) ? mail
40: .getRecipients()
41: : null;
42: }
43: }
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