/**
* Copyright (c) 2009--2014 Red Hat, Inc.
*
* This software is licensed to you under the GNU General Public License,
* version 2 (GPLv2). There is NO WARRANTY for this software, express or
* implied, including the implied warranties of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. You should have received a copy of GPLv2
* along with this software; if not, see
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
*
* Red Hat trademarks are not licensed under GPLv2. No permission is
* granted to use or replicate Red Hat trademarks that are incorporated
* in this software or its documentation.
*/
package com.redhat.rhn.frontend.dto;
import java.util.Comparator;
/**
* Implements the java.util.Comparator class for sorting SystemOverview objects
*
* @version $Rev$
*/
public class SystemOverviewComparator implements Comparator<SystemOverview> {
/**
* {@inheritDoc}
*/
public int compare(SystemOverview firstObj, SystemOverview secondObj) {
/*
* Sorts in descending order:
* Security Errata Count
* Bug Errata Count
* Enhancement Errata Count
* Alphabetically by system name
*/
SystemOverview first = firstObj;
SystemOverview second = secondObj;
int retval = compareLongs(first.getSecurityErrata(),
second.getSecurityErrata());
if (retval == 0) {
retval = compareLongs(first.getBugErrata(),
second.getBugErrata());
if (retval == 0) {
retval = compareLongs(first.getEnhancementErrata(),
second.getEnhancementErrata());
if (retval == 0) {
if (first.getName() != null && second.getName() != null) {
retval = first.getName().compareTo(second.getName());
}
}
}
}
return retval;
}
private int compareLongs(Long first, Long second) {
int retval = -2;
if (first != null && second == null) {
retval = 1;
}
else if (first == null && second != null) {
retval = -1;
}
else if (first == null && second == null) {
retval = 0;
}
if (retval == -2) {
long diff = first.longValue() - second.longValue();
if (diff < 0) {
retval = -1;
}
else if (diff > 0) {
retval = 1;
}
else {
retval = 0;
}
}
return retval * -1;
}
}