org.apache.myfaces.custom.schedule.model.HalfHourInterval Maven / Gradle / Ivy

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JSF components and utilities that can be used with any JSF implementation. This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build changes to take advantage of JSF2.1 features. A JSF2.1 implementation is required to use this version of the Tomahawk library.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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
 *
 *   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.apache.myfaces.custom.schedule.model;

import java.util.Date;

/**
 * 
 * This class represents an interval of up to half an hour.
 * The interval will always round up to the next half hour
 * e.g. a start time of 14:15 will generate an interval with
 * end time of 14:30.
 * 
 * @since 1.1.7
 * @author Peter Mahoney
 * @version $Revision: 371736 $
 */
public class HalfHourInterval extends Interval {

    public static final long HALF_HOUR = 1000 * 60 * 30;

    public HalfHourInterval(Date startTime, Date maxEnd)
    {
        super(null, startTime, new Date(Math.min(startTime.getTime() + HALF_HOUR, maxEnd.getTime())));
    }

    private HalfHourInterval(String label, Date startTime, Date endTime)
    {
        super(label, startTime, endTime); 
    }
    
    /**
     * Create a new half hour interval following on from the supplied interval.
     * The interval will be anything up to half an hour, depending on when the
     * end of the previous interval was. If an interval cannot be fitted between
     * the end of the last interval and the maximum end time, null will be returned.
     * 
     * @param interval The previous interval
     * @param maxEnd The maximum end time of the new interval
     * @return The next half hour interval
     */
    public static Interval next(Interval interval, Date maxEnd) {
        Date startTime = interval.getEndTime();
        
        if (startTime.before(maxEnd))
        {
            Date endTime = new Date(Math.min(startTime.getTime() - (startTime.getTime() % HALF_HOUR) + HALF_HOUR, maxEnd.getTime()));
            
            return new HalfHourInterval(null, startTime, endTime);
        }
        else
        {
            
            return null;
        }
    }
}