MultimediaDisplayComparator.java

/**
 * Licensed to Apereo under one or more contributor license
 * agreements. See the NOTICE file distributed with this work
 * for additional information regarding copyright ownership.
 * Apereo licenses this file to you 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 the following location:
 *
 *   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 org.jasig.portlet.blackboardvcportlet.mvc.sessionmngr;

import java.util.Comparator;

import org.jasig.portlet.blackboardvcportlet.data.Multimedia;

import com.google.common.collect.ComparisonChain;
import com.google.common.collect.Ordering;

public class MultimediaDisplayComparator implements Comparator<Multimedia> {
    public static final MultimediaDisplayComparator INSTANCE = new MultimediaDisplayComparator();
    
    @Override
    public int compare(Multimedia o1, Multimedia o2) {
        return ComparisonChain.start()
                .compare(o1.getFilename(), o2.getFilename(), Ordering.natural().nullsLast())
                .compare(o1.getLastUpdated(), o2.getLastUpdated(), Ordering.natural().nullsLast())
                .result();
    }
}