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


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: PriorityComparator.java,v 1.1 2004/08/23 14:39:26 spyromus Exp $
26 //
27
28 package de.nava.informa.utils.poller;
29
30 import de.nava.informa.utils.toolkit.ChannelRecord;
31
32 import java.util.Comparator JavaDoc;
33
34 /**
35  * Comparator for <code>ChannelRecord</code> class. Uses priority setting to decide which
36  * record goes first.
37  *
38  * @author Aleksey Gureev (spyromus@noizeramp.com)
39  */
40 public class PriorityComparator implements Comparator JavaDoc {
41   /**
42    * Compares its two arguments for order. Returns a negative integer,
43    * zero, or a positive integer as the first argument is less than, equal
44    * to, or greater than the second.<p>
45    *
46    * @param o1 the first object to be compared.
47    * @param o2 the second object to be compared.
48    * @return a negative integer, zero, or a positive integer as the
49    * first argument is less than, equal to, or greater than the
50    * second.
51    * @throws ClassCastException if the arguments' types prevent them from
52    * being compared by this Comparator.
53    */
54   public final int compare(Object JavaDoc o1, Object JavaDoc o2) {
55     final ChannelRecord r1 = (ChannelRecord) o1;
56     final ChannelRecord r2 = (ChannelRecord) o2;
57
58     final int p1 = r1.getPriority();
59     final int p2 = r2.getPriority();
60
61     int result = 0;
62
63     if (p1 < p2) {
64       result = -1;
65     } else if (p2 > p1) {
66       result = 1;
67     }
68
69     return result;
70   }
71 }
72
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