/*
* All content copyright Terracotta, Inc., unless otherwise indicated. 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 com.xxl.job.admin.core.cron;
import java.io.Serializable;
import java.text.ParseException;
import java.util.*;
/**
* Provides a parser and evaluator for unix-like cron expressions. Cron expressions
* provide the ability to specify complex time combinations such as "At 8:00am every
* Monday through Friday" or "At 1:30am every last Friday of the month".
* <P>
* Cron expressions are comprised of 6 required fields and one optional field separated by
* white space. The fields respectively are described as follows:
*
* <table cellspacing="8">
* <tr>
* <th align="left">Field Name</th>
* <th align="left"> </th>
* <th align="left">Allowed Values</th>
* <th align="left"> </th>
* <th align="left">Allowed Special Characters</th>
* </tr>
* <tr>
* <td align="left"><code>Seconds</code></td>
* <td align="left"> </th>
* <td align="left"><code>0-59</code></td>
* <td align="left"> </th>
* <td align="left"><code>, - * /</code></td>
* </tr>
* <tr>
* <td align="left"><code>Minutes</code></td>
* <td align="left"> </th>
* <td align="left"><code>0-59</code></td>
* <td align="left"> </th>
* <td align="left"><code>, - * /</code></td>
* </tr>
* <tr>
* <td align="left"><code>Hours</code></td>
* <td align="left"> </th>
* <td align="left"><code>0-23</code></td>
* <td align="left"> </th>
* <td align="left"><code>, - * /</code></td>
* </tr>
* <tr>
* <td align="left"><code>Day-of-month</code></td>
* <td align="left"> </th>
* <td align="left"><code>1-31</code></td>
* <td align="left"> </th>
* <td align="left"><code>, - * ? / L W</code></td>
* </tr>
* <tr>
* <td align="left"><code>Month</code></td>
* <td align="left"> </th>
* <td align="left"><code>0-11 or JAN-DEC</code></td>
* <td align="left"> </th>
* <td align="left"><code>, - * /</code></td>
* </tr>
* <tr>
* <td align="left"><code>Day-of-Week</code></td>
* <td align="left"> </th>
* <td align="left"><code>1-7 or SUN-SAT</code></td>
* <td align="left"> </th>
* <td align="left"><code>, - * ? / L #</code></td>
* </tr>
* <tr>
* <td align="left"><code>Year (Optional)</code></td>
* <td align="left"> </th>
* <td align="left"><code>empty, 1970-2199</code></td>
* <td align="left"> </th>
* <td align="left"><code>, - * /</code></td>
* </tr>
* </table>
* <P>
* The '*' character is used to specify all values. For example, "*" in the
* minute field means "every minute".
* <P>
* The '?' character is allowed for the day-of-month and day-of-week fields. It is used to
* specify 'no specific value'. This is useful when you need to specify something in one
* of the two fields, but not the other.
* <P>
* The '-' character is used to specify ranges For example "10-12" in the hour
* field means "the hours 10, 11 and 12".
* <P>
* The ',' character is used to specify additional values. For example
* "MON,WED,FRI" in the day-of-week field means "the days Monday,
* Wednesday, and Friday".
* <P>
* The '/' character is used to specify increments. For example "0/15" in the
* seconds field means "the seconds 0, 15, 30, and 45". And "5/15" in
* the seconds field means "the seconds 5, 20, 35, and 50". Specifying '*'
* before the '/' is equivalent to specifying 0 is the value to start with. Essentially,
* for each field in the expression, there is a set of numbers that can be turned on or
* off. For seconds and minutes, the numbers range from 0 to 59. For hours 0 to 23, for
* days of the month 0 to 31, and for months 0 to 11 (JAN to DEC). The "/"
* character simply helps you turn on every "nth" value in the given set. Thus
* "7/6" in the month field only turns on month "7", it does NOT mean
* every 6th month, please note that subtlety.
* <P>
* The 'L' character is allowed for the day-of-month and day-of-week fields. This
* character is short-hand for "last", but it has different meaning in each of
* the two fields. For example, the value "L" in the day-of-month field means
* "the last day of the month" - day 31 for January, day 28 for February on
* non-leap years. If used in the day-of-week field by itself, it simply means
* "7" or "SAT". But if used in the day-of-week field after another
* value, it means "the last xxx day of the month" - for example "6L"
* means "the last friday of the month". You can also specify an offset from the
* last day of the month, such as "L-3" which would mean the third-to-last day of the
* calendar month. <i>When using the 'L' option, it is important not to specify lists, or
* ranges of values, as you'll get confusing/unexpected results.</i>
* <P>
* The 'W' character is allowed for the day-of-month field. This character is used to
* specify the weekday (Monday-Friday) nearest the given day. As an example, if you were
* to specify "15W" as the value for the day-of-month field, the meaning is:
* "the nearest weekday to the 15th of the month". So if the 15th is a Saturday,
* the trigger will fire on Friday the 14th. If the 15th is a Sunday, the trigger will
* fire on Monday the 16th. If the 15th is a Tuesday, then it will fire on Tuesday the
* 15th. However if you specify "1W" as the value for day-of-month, and the 1st
* is a Saturday, the trigger will fire on Monday the 3rd, as it will not 'jump' over the
* boundary of a month's days. The 'W' character can only be specified when the
* day-of-month is a single day, not a range or list of days.
* <P>
* The 'L' and 'W' characters can also be combined for the day-of-month expression to
* yield 'LW', which translates to "last weekday of the month".
* <P>
* The '#' character is allowed for the day-of-week field. This character is used to
* specify "the nth" XXX day of the month. For example, the value of
* "6#3" in the day-of-week field means the third Friday of the month (day 6 =
* Friday and "#3" = the 3rd one in the month). Other examples: "2#1"
* = the first Monday of the month and "4#5" = the fifth Wednesday of the month.
* Note that if you specify "#5" and there is not 5 of the given day-of-week in
* the month, then no firing will occur that month. If the '#' character is used, there
* can only be one expression in the day-of-week field ("3#1,6#3" is not valid,
* since there are two expressions).
* <P>
* <!--The 'C' character is allowed for the day-of-month and day-of-week fields. This
* character is short-hand for "calendar". This means values are calculated against the
* associated calendar, if any. If no calendar is associated, then it is equivalent to
* having an all-inclusive calendar. A value of "5C" in the day-of-month field means "the
* first day included by the calendar on or after the 5th". A value of "1C" in the
* day-of-week field means "the first day included by the calendar on or after Sunday".-->
* <P>
* The legal characters and the names of months and days of the week are not case
* sensitive.
*
* <p>
* <b>NOTES:</b>
* <ul>
* <li>Support for specifying bo
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