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Date Calculator methods for JDK
There is a newer version: 1.1.0
/*
 * $Id: DateDateCalculator.java 184 2006-09-17 09:42:49Z marchy $
 * 
 * Copyright 2006 the original author or authors.
 *
 * 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 net.objectlab.kit.datecalc.jdk;

import java.util.Calendar;
import java.util.Collections;
import java.util.Date;
import java.util.Set;

import net.objectlab.kit.datecalc.common.AbstractDateCalculator;
import net.objectlab.kit.datecalc.common.DateCalculator;
import net.objectlab.kit.datecalc.common.HolidayHandler;
import net.objectlab.kit.datecalc.common.Utils;
import net.objectlab.kit.datecalc.common.WorkingWeek;

/**
 * This class is used via the DateCalculator interface, it enables the handling
 * of different HolidayHandler, if no HolidayHandler is defined, the calendar
 * will NOT move a date, even if it falls on a holiday or weekend.
 * 
 * @author Marcin Jekot
 * @author $LastModifiedBy$
 * @version $Revision: 184 $ $Date: 2006-09-17 10:42:49 +0100 (Sun, 17 Sep 2006) $
 */
public class DateDateCalculator extends AbstractDateCalculator {

    private CalendarDateCalculator delegate;

    @SuppressWarnings("unchecked")
    public DateDateCalculator() {
        this(null, null, Collections.EMPTY_SET, null);
    }

    public DateDateCalculator(final String name, final Date startDate, final Set nonWorkingDays,
            final HolidayHandler holidayHandler) {
        super(name, nonWorkingDays, holidayHandler);
        Date date = startDate;
        final HolidayHandler locDate = new HolidayHandlerDateWrapper(holidayHandler, this);

        final Set nonWorkingCalendars = Utils.toCalendarSet(nonWorkingDays);
        if (date == null) {
            date = getToday();
        }

        delegate = new CalendarDateCalculator(name, Utils.getCal(date), nonWorkingCalendars, locDate);
        delegate.setStartDate(Utils.getCal(date));
        setStartDate(date);
    }

    // TODO throw an exception if the type is incorrect
    public void setWorkingWeek(final WorkingWeek week) {
        delegate.setWorkingWeek(week);
    }

    /**
     * is the date a non-working day according to the WorkingWeek?
     */
    public boolean isWeekend(final Date date) {
        if (date != null && delegate != null) {
            return delegate.isWeekend(Utils.getCal(date));
        }
        return false;
    }

    public DateCalculator moveByDays(final int days) {
        delegate.setCurrentBusinessDate(Utils.getCal(getCurrentBusinessDate()));
        setCurrentBusinessDate(delegate.moveByDays(days).getCurrentBusinessDate().getTime());
        return this;
    }

    @Override
    protected DateCalculator createNewCalculator(final String name, final Date startDate, final Set holidays,
            final HolidayHandler handler) {
        return new DateDateCalculator(name, startDate, holidays, handler);
    }

    @Override
    public void setStartDate(final Date startDate) {
        if (delegate != null) {
            delegate.setStartDate(startDate != null ? Utils.getCal(startDate) : null);
        }
        super.setStartDate(startDate);
    }

    @Override
    protected Date getToday() {
        return Utils.blastTime(Calendar.getInstance()).getTime();
    }

    @Override
    protected DateCalculator moveByMonths(final int months) {
        delegate.setCurrentBusinessDate(Utils.getCal(getCurrentBusinessDate()));
        setCurrentBusinessDate(delegate.moveByMonths(months).getCurrentBusinessDate().getTime());
        return this;
    }
}