/*
* #!
* Ontopoly Editor
* #-
* Copyright (C) 2001 - 2013 The Ontopia Project
* #-
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* !#
*/
package ontopoly.utils;
import java.io.Serializable;
import java.util.Comparator;
import ontopoly.model.Topic;
import net.ontopia.utils.StringUtils;
public class TopicComparator implements Comparator<Topic>, Serializable {
public static final TopicComparator INSTANCE = new TopicComparator();
private TopicComparator() {
// don't call me
}
public int compare(Topic t1, Topic t2) {
if (t1 == null && t2 == null) return 0;
else if (t1 == null)
return 1;
else if (t2 == null)
return -1;
return StringUtils.compareToIgnoreCase(t1.getName(), t2.getName());
}
}