/*
* Copyright (c) 2010, SQL Power Group Inc.
*
* This file is part of SQL Power Library.
*
* SQL Power Library is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* SQL Power Library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package ca.sqlpower.object;
import java.util.Comparator;
/**
* This {@link Comparator} compares UUIDs between {@link SPObject}s. Null
* {@link SPObject}s are allowed and come before non-null {@link SPObject}s.
*/
public class SPObjectUUIDComparator<T extends SPObject> implements Comparator<T> {
public int compare(T spo1, T spo2) {
if (spo1 == spo2) {
return 0;
} else if (spo1 == null) {
return -1;
} else if (spo2 == null) {
return 1;
} else {
return spo1.getUUID().compareTo(spo2.getUUID());
}
}
}