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Java > Open Source Codes > de > nava > informa > utils > cleaner > CompositeMatcher


1 //
2 // Informa -- RSS Library for Java
3 // Copyright (c) 2002 by Niko Schmuck
4 //
5 // Niko Schmuck
6 // http://sourceforge.net/projects/informa
7 // mailto:niko_schmuck@users.sourceforge.net
8 //
9 // This library is free software.
10 //
11 // You may redistribute it and/or modify it under the terms of the GNU
12 // Lesser General Public License as published by the Free Software Foundation.
13 //
14 // Version 2.1 of the license should be included with this distribution in
15 // the file LICENSE. If the license is not included with this distribution,
16 // you may find a copy at the FSF web site at 'www.gnu.org' or 'www.fsf.org',
17 // or you may write to the Free Software Foundation, 675 Mass Ave, Cambridge,
18 // MA 02139 USA.
19 //
20 // This library is distributed in the hope that it will be useful,
21 // but WITHOUT ANY WARRANTY; without even the implied waranty of
22 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 // Lesser General Public License for more details.
24 //
25 // $Id: CompositeMatcher.java,v 1.1 2004/08/24 18:07:54 spyromus Exp $
26 //
27
28 package de.nava.informa.utils.cleaner;
29
30 import de.nava.informa.core.ChannelIF;
31 import de.nava.informa.core.ItemIF;
32
33 import java.util.List JavaDoc;
34 import java.util.Vector JavaDoc;
35
36 /**
37  * Composite matcher follows Composite pattern to combine several matchers
38  * and present them as single instance. It uses simple rule to make a decision.
39  * If at least one matcher matches the item composite object also returns match.
40  *
41  * @author Aleksey Gureev (spyromus@noizeramp.com)
42  */
43 class CompositeMatcher implements CleanerMatcherIF {
44   private List JavaDoc matchers = new Vector JavaDoc();
45
46   /**
47    * Invoked by cleaning engine to check given item in given channel for matching some rule.
48    *
49    * @param item item to check.
50    * @param channel channel where the item is.
51    * @return TRUE if item matches the rule.
52    */
53   public boolean isMatching(ItemIF item, ChannelIF channel) {
54     boolean matching = false;
55
56     final int size = matchers.size();
57     for (int i = 0; i < size && !matching; i++) {
58       CleanerMatcherIF matcher = (CleanerMatcherIF) matchers.get(i);
59       matching = matcher.isMatching(item, channel);
60     }
61
62     return matching;
63   }
64
65   /**
66    * Adds new matcher to the list.
67    *
68    * @param m matcher object.
69    */
70   public void add(CleanerMatcherIF m) {
71     if (!matchers.contains(m)) {
72       matchers.add(m);
73     }
74   }
75
76   /**
77    * Removes matcher from the list.
78    *
79    * @param m matcher object.
80    */
81   public void remove(CleanerMatcherIF m) {
82     matchers.remove(m);
83   }
84 }
85
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