monthlycalendar.java

定时器开源项目, 相对于 jcrontab, Quartz 算是更完整的一个项目, 随著开发的版本上来, 他已经脱离只是写在程序里面的计时器, 在指定的时间或区间, 处理所指定的事件. 也加入了 se

/*
 * Copyright Juergen Donnerstag (c) 2002, EDS 2002
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met: 1.
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer. 2. Redistributions in
 * binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.quartz.impl.calendar;

import java.io.Serializable;
import java.util.Date;

import org.quartz.Calendar;

/**
 * <p>
 * This implementation of the Calendar excludes a set of days of the month. You
 * may use it to exclude every 1. of each month for example. But you may define
 * any day of a month.
 * </p>
 * 
 * @see org.quartz.Calendar
 * @see org.quartz.impl.calendar.BaseCalendar
 * 
 * @author Juergen Donnerstag
 */
public class MonthlyCalendar extends BaseCalendar implements Calendar,
        Serializable {

    // An array to store a months days which are to be excluded.
    // java.util.Calendar.get( ) as index.
    private boolean[] excludeDays = new boolean[31];

    // Will be set to true, if all week days are excluded
    private boolean excludeAll = false;

    /**
     * <p>
     * Constructor
     * </p>
     */
    public MonthlyCalendar() {
        super();
        init();
    }

    /**
     * <p>
     * Constructor
     * </p>
     */
    public MonthlyCalendar(Calendar baseCalendar) {
        super(baseCalendar);
        init();
    }

    /**
     * <p>
     * Initialize internal variables
     * </p>
     */
    private void init() {
        // all days are included by default
        excludeAll = areAllDaysExcluded();
    }

    /**
     * <p>
     * Get the array which defines the exclude-value of each day of month
     * </p>
     */
    public boolean[] getDaysExcluded() {
        return excludeDays;
    }

    /**
     * <p>
     * Return true, if mday is defined to be exluded.
     * </p>
     */
    public boolean isDayExcluded(int day) {
        return excludeDays[day - 1];
    }

    /**
     * <p>
     * Redefine the array of days excluded. The array must of size greater or
     * equal 31.
     * </p>
     */
    public void setDaysExcluded(boolean[] days) {
        if (days == null) return;

        excludeDays = days;
        excludeAll = areAllDaysExcluded();
    }

    /**
     * <p>
     * Redefine a certain day of the month to be excluded (true) or included
     * (false).
     * </p>
     */
    public void setDayExcluded(int day, boolean exclude) {
        excludeDays[day] = exclude;
        excludeAll = areAllDaysExcluded();
    }

    /**
     * <p>
     * Check if all days are excluded. That is no day is included.
     * </p>
     * 
     * @return boolean
     */
    public boolean areAllDaysExcluded() {
        for (int i = 1; i <= 31; i++) {
            if (isDayExcluded(i) == false) return false;
        }

        return true;
    }

    /**
     * <p>
     * Determine whether the given time (in milliseconds) is 'included' by the
     * Calendar.
     * </p>
     * 
     * <p>
     * Note that this Calendar is only has full-day precision.
     * </p>
     */
    public boolean isTimeIncluded(long timeStamp) {
        if (excludeAll == true) return false;

        // Test the base calendar first. Only if the base calendar not already
        // excludes the time/date, continue evaluating this calendar instance.
        if (super.isTimeIncluded(timeStamp) == false) { return false; }

        java.util.Calendar cl = java.util.Calendar.getInstance();
        cl.setTime(new Date(timeStamp));
        int day = cl.get(java.util.Calendar.DAY_OF_MONTH);

        return !(isDayExcluded(day));
    }

    /**
     * <p>
     * Determine the next time (in milliseconds) that is 'included' by the
     * Calendar after the given time. Return the original value if timeStamp is
     * included. Return 0 if all days are excluded.
     * </p>
     * 
     * <p>
     * Note that this Calendar is only has full-day precision.
     * </p>
     */
    public long getNextIncludedTime(long timeStamp) {
        if (excludeAll == true) return 0;

        // Call base calendar implementation first
        long baseTime = super.getNextIncludedTime(timeStamp);
        if ((baseTime > 0) && (baseTime > timeStamp)) timeStamp = baseTime;

        // Get timestamp for 00:00:00
        long newTimeStamp = buildHoliday(timeStamp);

        java.util.Calendar cl = getJavaCalendar(newTimeStamp);
        int day = cl.get(java.util.Calendar.DAY_OF_MONTH);

        if (!isDayExcluded(day)) return timeStamp; // return the original value

        while (isDayExcluded(day) == true) {
            cl.add(java.util.Calendar.DATE, 1);
            day = cl.get(java.util.Calendar.DAY_OF_WEEK);
        }

        return cl.getTime().getTime();
    }

}