01: // The contents of this file are subject to the Mozilla Public License Version
02: // 1.1
03: //(the "License"); you may not use this file except in compliance with the
04: //License. You may obtain a copy of the License at http://www.mozilla.org/MPL/
05: //
06: //Software distributed under the License is distributed on an "AS IS" basis,
07: //WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
08: //for the specific language governing rights and
09: //limitations under the License.
10: //
11: //The Original Code is "The Columba Project"
12: //
13: //The Initial Developers of the Original Code are Frederik Dietz and Timo
14: // Stich.
15: //Portions created by Frederik Dietz and Timo Stich are Copyright (C) 2003.
16: //
17: //All Rights Reserved.
18: package org.columba.mail.spam.rules;
19:
20: import org.columba.mail.folder.IMailbox;
21: import org.columba.ristretto.message.Header;
22:
23: /**
24: * Check if From: header contains many digits.
25: *
26: * @author fdietz
27: *
28: */
29: public class MixedCharactersAddressRule extends AbstractRule {
30:
31: public MixedCharactersAddressRule() {
32: super ("MixedCharactersAddressRule");
33:
34: }
35:
36: /**
37: * @see org.columba.mail.spam.rules.Rule#score(IMailbox,
38: * java.lang.Object)
39: */
40: public float score(IMailbox folder, Object uid) throws Exception {
41: Header header = folder.getHeaderFields(uid,
42: new String[] { "From" });
43: String from = header.get("From");
44: if (from == null)
45: return NEARLY_ZERO;
46: if (from.length() == 0)
47: return NEARLY_ZERO;
48:
49: int count = 0;
50: for (int i = 0; i < from.length(); i++) {
51: if (Character.isDigit(from.charAt(i)))
52: count++;
53: }
54:
55: // if 1/3 of all characters are digits
56: if (count > from.length() / 3)
57: return MAX_PROBABILITY;
58:
59: return NEARLY_ZERO;
60: }
61:
62: }
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