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'databene commons' is an open source Java library by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.
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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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.databene.commons;

import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.text.SimpleDateFormat;

/**
 * Represents a timespan between two dates.
 * Created: 17.02.2005 20:59:22
 */
public class Timespan {

    private static SimpleDateFormat sdf = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss");

    public Date startDate;
    public Date endDate;

    public Timespan(Date startDate, Date endDate) {
        this.startDate = startDate;
        this.endDate = endDate;
    }

    public boolean overlaps(Timespan that) {
        return (intersection(this, that) != null);
    }

    public Long duration() {
        if (endDate != null && startDate != null)
            return new Long(endDate.getTime() - startDate.getTime());
        else
            return null;
    }

    public boolean contains(Timespan that) {
        return (!this.startDate.after(that.startDate) && !this.endDate.before(that.endDate));
    }

    public boolean contains(Date date) {
        return (!this.startDate.after(date) && !this.endDate.before(date));
    }

    public static Timespan intersection(Timespan span1, Timespan span2) {
        Date startDate = span1.startDate;
        if (span1.startDate == null || (span2.startDate != null && span1.startDate.before(span2.startDate)))
            startDate = span2.startDate;
        Date endDate = span1.endDate;
        if (span1.endDate == null || (span2.endDate != null && span1.endDate.after(span2.endDate)))
            endDate = span2.endDate;
        if (startDate != null && endDate != null && !endDate.after(startDate))
            return null;
        return new Timespan(startDate, endDate);
    }

    public static Timespan unite(Timespan span1, Timespan span2) {
        Date startDate = span1.startDate;
        if (startDate != null) {
            Date date2 = span2.startDate;
            if (date2 == null)
                startDate = date2;
            else if (date2.before(startDate))
                startDate = date2;
        }
        Date endDate = span1.endDate;
        if (endDate != null) {
            Date date2 = span2.endDate;
            if (date2 == null)
                endDate = date2;
            else if (date2.after(endDate))
                endDate = date2;
        }
        return new Timespan(startDate, endDate);
    }
    
    public static Timespan recentDays(int count) {
    	Date end = TimeUtil.today();
    	Date start = TimeUtil.addDays(end, - count);
    	return new Timespan(start, end);
    }

	public static Timespan futureDays(int count) {
    	Date start = TimeUtil.today();
    	Date end = TimeUtil.addDays(start, count);
    	return new Timespan(start, end);
	}


	public Iterator dayIterator() {
		List dates = new ArrayList();
		for (Date date = startDate; !date.after(endDate); date = TimeUtil.addDays(date, 1))
			dates.add(date);
		return dates.iterator();
	}
    
    @Override
    public String toString() {
        if (startDate != null)
            if (endDate != null)
                return sdf.format(startDate) + " - " + sdf.format(endDate);
            else
                return "since " + sdf.format(startDate);
        else
            if (endDate != null)
                return "until " + sdf.format(endDate);
            else
                return "ever";
    }

	@Override
	public int hashCode() {
		int result = ((endDate == null) ? 0 : endDate.hashCode());
		return result * 31 + ((startDate == null) ? 0 : startDate.hashCode());
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null || getClass() != obj.getClass())
			return false;
		final Timespan that = (Timespan) obj;
		if (endDate == null) {
			if (that.endDate != null)
				return false;
		} else if (!endDate.equals(that.endDate))
			return false;
		if (startDate == null) {
			if (that.startDate != null)
				return false;
		} else 
			return (startDate.equals(that.startDate));
		return true;
	}

}