1 /**
2 * This file Copyright (c) 2003-2018 Magnolia International
3 * Ltd. (http://www.magnolia-cms.com). All rights reserved.
4 *
5 *
6 * This file is dual-licensed under both the Magnolia
7 * Network Agreement and the GNU General Public License.
8 * You may elect to use one or the other of these licenses.
9 *
10 * This file is distributed in the hope that it will be
11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
12 * implied warranty of MERCHANTABILITY or FITNESS FOR A
13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
14 * Redistribution, except as permitted by whichever of the GPL
15 * or MNA you select, is prohibited.
16 *
17 * 1. For the GPL license (GPL), you can redistribute and/or
18 * modify this file under the terms of the GNU General
19 * Public License, Version 3, as published by the Free Software
20 * Foundation. You should have received a copy of the GNU
21 * General Public License, Version 3 along with this program;
22 * if not, write to the Free Software Foundation, Inc., 51
23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
24 *
25 * 2. For the Magnolia Network Agreement (MNA), this file
26 * and the accompanying materials are made available under the
27 * terms of the MNA which accompanies this distribution, and
28 * is available at http://www.magnolia-cms.com/mna.html
29 *
30 * Any modifications to this file must keep this entire header
31 * intact.
32 *
33 */
34 package info.magnolia.voting;
35
36 import org.slf4j.Logger;
37 import org.slf4j.LoggerFactory;
38
39
40 /**
41 * The highest returned vote is taken (8 or -10, ..) and returned. The voting
42 * can return 0 if no voter has anything to say.
43 *
44 * @param <T> the type of object passed to vote
45 */
46 public class DefaultVoting<T> implements Voting<T> {
47
48 Logger log = LoggerFactory.getLogger(DefaultVoting.class);
49
50 @Override
51 public int vote(Voter<T>[] voters, T value) {
52 int highestVote = 0;
53 for (int i = 0; i < voters.length; i++) {
54 Voter voter = voters[i];
55 if (voter.isEnabled()) {
56 int vote = voter.vote(value);
57 log.debug("voter [{}] fired {}", voter, vote);
58
59 if (Math.abs(vote) > Math.abs(highestVote)) {
60 highestVote = vote;
61 log.debug("highest vote is now {}", Integer.toString(highestVote));
62 }
63 // same value but not same sign
64 else if (vote == -highestVote) {
65 highestVote = Math.abs(vote);
66 log.debug("highest vote is now {}", Integer.toString(highestVote));
67 }
68 }
69 }
70 return highestVote;
71 }
72 }