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Java > Open Source Codes > de > nava > informa > utils > poller > CompositeApprover


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: CompositeApprover.java,v 1.2 2004/08/24 17:45:56 spyromus Exp $
26 //
27
28 package de.nava.informa.utils.poller;
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 approver uses all of its sub-approvers to form decision.
38  *
39  * @author Aleksey Gureev (spyromus@noizeramp.com)
40  */
41 class CompositeApprover implements PollerApproverIF {
42   private List JavaDoc approvers = new Vector JavaDoc();
43
44   /**
45    * Decides whether it's possible to add item to the channel or no.
46    *
47    * @param item item to add.
48    * @param channel destination channel.
49    * @return TRUE if addition is allowed.
50    */
51   public final boolean canAddItem(ItemIF item, ChannelIF channel) {
52     boolean result = true;
53     int i = 0;
54     final int size = approvers.size();
55     while (i < size && result) {
56       final PollerApproverIF approver = (PollerApproverIF) approvers.get(i);
57       result = approver.canAddItem(item, channel);
58       i++;
59     }
60
61     return result;
62   }
63
64   /**
65    * Adds new approver to the list.
66    *
67    * @param approver new approver.
68    */
69   public final void add(PollerApproverIF approver) {
70     if (!approvers.contains(approver)) {
71       approvers.add(approver);
72     }
73   }
74
75   /**
76    * Removes approver from the list.
77    *
78    * @param approver registered approver.
79    */
80   public final void remove(PollerApproverIF approver) {
81     approvers.remove(approver);
82   }
83 }
84
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