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


1 //
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// Informa -- RSS Library for Java
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// Copyright (c) 2002 by Niko Schmuck
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//
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// Niko Schmuck
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// http://sourceforge.net/projects/informa
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// mailto:niko_schmuck@users.sourceforge.net
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//
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// This library is free software.
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//
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// You may redistribute it and/or modify it under the terms of the GNU
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// Lesser General Public License as published by the Free Software Foundation.
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//
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// Version 2.1 of the license should be included with this distribution in
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// the file LICENSE. If the license is not included with this distribution,
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// you may find a copy at the FSF web site at 'www.gnu.org' or 'www.fsf.org',
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// or you may write to the Free Software Foundation, 675 Mass Ave, Cambridge,
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// MA 02139 USA.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied waranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// $Id: CompositeApprover.java,v 1.2 2004/08/24 17:45:56 spyromus Exp $
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//
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28 package de.nava.informa.utils.poller;
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30 import de.nava.informa.core.ChannelIF;
31 import de.nava.informa.core.ItemIF;
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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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