org.onebusaway.admin.comparator.LastUpdateComparator.java Source code

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Here is the source code for org.onebusaway.admin.comparator.LastUpdateComparator.java

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/**
 * Copyright (C) 2015 Cambridge Systematics, Inc.
 *
 * 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 org.onebusaway.admin.comparator;

import java.util.Comparator;

import org.apache.commons.lang.StringUtils;
import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;
import org.onebusaway.admin.model.ui.VehicleStatus;

/**
 * Compares vehicle records on last reported time
 * @author abelsare
 *
 */
public class LastUpdateComparator implements Comparator<VehicleStatus> {

    private TimeComparator timeComparator;
    private DateTimeFormatter formatter = ISODateTimeFormat.dateTime();

    public LastUpdateComparator(String order) {
        timeComparator = new TimeComparator(order);
    }

    @Override
    public int compare(VehicleStatus o1, VehicleStatus o2) {
        if (StringUtils.isBlank(o1.getLastUpdate())) {
            return 1;
        }
        if (StringUtils.isBlank(o2.getLastUpdate())) {
            return -1;
        }

        DateTime time1 = formatter.parseDateTime(o1.getLastUpdate());
        DateTime time2 = formatter.parseDateTime(o2.getLastUpdate());
        return timeComparator.compare(time1, time2);
    }
}