/*
* This file is part of LibrePlan
*
* Copyright (C) 2009-2010 Fundación para o Fomento da Calidade Industrial e
* Desenvolvemento Tecnolóxico de Galicia
* Copyright (C) 2010-2011 Igalia, S.L.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
*
*/
package org.zkoss.ganttz.util;
import static java.util.Arrays.asList;
import java.util.Collections;
import java.util.Date;
import org.apache.commons.lang.Validate;
import org.apache.commons.lang.math.Fraction;
import org.joda.time.DateTime;
import org.joda.time.Days;
import org.joda.time.Duration;
import org.joda.time.LocalDate;
public class Interval {
private final Duration lengthBetween;
private final Days daysBetween;
private LocalDate startInclusive;
private LocalDate endExclusive;
public Interval(Date start, Date finish) {
this(LocalDate.fromDateFields(start), LocalDate.fromDateFields(finish));
}
public Interval(LocalDate startInclusive, LocalDate endExclusive) {
Validate.notNull(startInclusive);
Validate.notNull(endExclusive);
Validate.isTrue(endExclusive.isAfter(startInclusive));
this.startInclusive = startInclusive;
this.endExclusive = endExclusive;
this.lengthBetween = new Duration(
this.startInclusive.toDateTimeAtStartOfDay(),
this.endExclusive.toDateTimeAtStartOfDay());
this.daysBetween = Days.daysBetween(this.startInclusive,
this.endExclusive);
}
public Days getDaysBetween() {
return daysBetween;
}
public LocalDate getStart() {
return startInclusive;
}
public LocalDate getFinish() {
return endExclusive;
}
public Duration getLengthBetween() {
return lengthBetween;
}
public Fraction getProportion(DateTime date) {
Days fromStartToDate = Days.daysBetween(startInclusive,
date.toLocalDate());
Fraction result = Fraction.getFraction(fromStartToDate.getDays(),
this.daysBetween.getDays());
try {
return result.add(inTheDayIncrement(date));
} catch (ArithmeticException e) {
return result;
}
}
private Fraction inTheDayIncrement(DateTime date) {
DateTime atStartOfDay = date.toLocalDate().toDateTimeAtStartOfDay();
Duration duration = new Duration(atStartOfDay, date);
double result = ((double) duration.getMillis())
/ lengthBetween.getMillis();
return Fraction.getFraction(result);
}
@SuppressWarnings("unchecked")
public Interval coalesce(Interval otherInterval) {
Validate.notNull(otherInterval);
LocalDate minStart = Collections.min(asList(startInclusive,
otherInterval.startInclusive));
LocalDate maxEnd = Collections.max(asList(endExclusive,
otherInterval.endExclusive));
return new Interval(minStart, maxEnd);
}
}