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e7c126	1	/*
H	2	* All content copyright Terracotta, Inc., unless otherwise indicated. All rights reserved.
	3	*
	4	* Licensed under the Apache License, Version 2.0 (the "License"); you may not
	5	* use this file except in compliance with the License. You may obtain a copy
	6	* of the License at
	7	*
	8	* http://www.apache.org/licenses/LICENSE-2.0
	9	*
	10	* Unless required by applicable law or agreed to in writing, software
	11	* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
	12	* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
	13	* License for the specific language governing permissions and limitations
	14	* under the License.
	15	*
	16	*/
	17
	18	package com.xxl.job.admin.core.cron;
	19
	20	import java.io.Serializable;
	21	import java.text.ParseException;
	22	import java.util.Calendar;
	23	import java.util.Date;
	24	import java.util.HashMap;
	25	import java.util.Iterator;
	26	import java.util.Locale;
	27	import java.util.Map;
	28	import java.util.SortedSet;
	29	import java.util.StringTokenizer;
	30	import java.util.TimeZone;
	31	import java.util.TreeSet;
	32
	33	/**
	34	* Provides a parser and evaluator for unix-like cron expressions. Cron
	35	* expressions provide the ability to specify complex time combinations such as
	36	* "At 8:00am every Monday through Friday" or "At 1:30am every
	37	* last Friday of the month".
	38	* <P>
	39	* Cron expressions are comprised of 6 required fields and one optional field
	40	* separated by white space. The fields respectively are described as follows:
	41	*
	42	* <table cellspacing="8">
	43	* <tr>
	44	* <th align="left">Field Name</th>
	45	* <th align="left"> </th>
	46	* <th align="left">Allowed Values</th>
	47	* <th align="left"> </th>
	48	* <th align="left">Allowed Special Characters</th>
	49	* </tr>
	50	* <tr>
	51	* <td align="left"><code>Seconds</code></td>
	52	* <td align="left"> </th>
	53	* <td align="left"><code>0-59</code></td>
	54	* <td align="left"> </th>
	55	* <td align="left"><code>, - * /</code></td>
	56	* </tr>
	57	* <tr>
	58	* <td align="left"><code>Minutes</code></td>
	59	* <td align="left"> </th>
	60	* <td align="left"><code>0-59</code></td>
	61	* <td align="left"> </th>
	62	* <td align="left"><code>, - * /</code></td>
	63	* </tr>
	64	* <tr>
	65	* <td align="left"><code>Hours</code></td>
	66	* <td align="left"> </th>
	67	* <td align="left"><code>0-23</code></td>
	68	* <td align="left"> </th>
	69	* <td align="left"><code>, - * /</code></td>
	70	* </tr>
	71	* <tr>
	72	* <td align="left"><code>Day-of-month</code></td>
	73	* <td align="left"> </th>
	74	* <td align="left"><code>1-31</code></td>
	75	* <td align="left"> </th>
	76	* <td align="left"><code>, - * ? / L W</code></td>
	77	* </tr>
	78	* <tr>
	79	* <td align="left"><code>Month</code></td>
	80	* <td align="left"> </th>
	81	* <td align="left"><code>0-11 or JAN-DEC</code></td>
	82	* <td align="left"> </th>
	83	* <td align="left"><code>, - * /</code></td>
	84	* </tr>
	85	* <tr>
	86	* <td align="left"><code>Day-of-Week</code></td>
	87	* <td align="left"> </th>
	88	* <td align="left"><code>1-7 or SUN-SAT</code></td>
	89	* <td align="left"> </th>
	90	* <td align="left"><code>, - * ? / L #</code></td>
	91	* </tr>
	92	* <tr>
	93	* <td align="left"><code>Year (Optional)</code></td>
	94	* <td align="left"> </th>
	95	* <td align="left"><code>empty, 1970-2199</code></td>
	96	* <td align="left"> </th>
	97	* <td align="left"><code>, - * /</code></td>
	98	* </tr>
	99	* </table>
	100	* <P>
	101	* The '' character is used to specify all values. For example, ""
	102	* in the minute field means "every minute".
	103	* <P>
	104	* The '?' character is allowed for the day-of-month and day-of-week fields. It
	105	* is used to specify 'no specific value'. This is useful when you need to
	106	* specify something in one of the two fields, but not the other.
	107	* <P>
	108	* The '-' character is used to specify ranges For example "10-12" in
	109	* the hour field means "the hours 10, 11 and 12".
	110	* <P>
	111	* The ',' character is used to specify additional values. For example
	112	* "MON,WED,FRI" in the day-of-week field means "the days Monday,
	113	* Wednesday, and Friday".
	114	* <P>
	115	* The '/' character is used to specify increments. For example "0/15"
	116	* in the seconds field means "the seconds 0, 15, 30, and 45". And
	117	* "5/15" in the seconds field means "the seconds 5, 20, 35, and
	118	* 50". Specifying '*' before the '/' is equivalent to specifying 0 is
	119	* the value to start with. Essentially, for each field in the expression, there
	120	* is a set of numbers that can be turned on or off. For seconds and minutes,
	121	* the numbers range from 0 to 59. For hours 0 to 23, for days of the month 0 to
	122	* 31, and for months 0 to 11 (JAN to DEC). The "/" character simply helps you turn
	123	* on every "nth" value in the given set. Thus "7/6" in the
	124	* month field only turns on month "7", it does NOT mean every 6th
	125	* month, please note that subtlety.
	126	* <P>
	127	* The 'L' character is allowed for the day-of-month and day-of-week fields.
	128	* This character is short-hand for "last", but it has different
	129	* meaning in each of the two fields. For example, the value "L" in
	130	* the day-of-month field means "the last day of the month" - day 31
	131	* for January, day 28 for February on non-leap years. If used in the
	132	* day-of-week field by itself, it simply means "7" or
	133	* "SAT". But if used in the day-of-week field after another value, it
	134	* means "the last xxx day of the month" - for example "6L"
	135	* means "the last friday of the month". You can also specify an offset
	136	* from the last day of the month, such as "L-3" which would mean the third-to-last
	137	* day of the calendar month. <i>When using the 'L' option, it is important not to
	138	* specify lists, or ranges of values, as you'll get confusing/unexpected results.</i>
	139	* <P>
	140	* The 'W' character is allowed for the day-of-month field. This character
	141	* is used to specify the weekday (Monday-Friday) nearest the given day. As an
	142	* example, if you were to specify "15W" as the value for the
	143	* day-of-month field, the meaning is: "the nearest weekday to the 15th of
	144	* the month". So if the 15th is a Saturday, the trigger will fire on
	145	* Friday the 14th. If the 15th is a Sunday, the trigger will fire on Monday the
	146	* 16th. If the 15th is a Tuesday, then it will fire on Tuesday the 15th.
	147	* However if you specify "1W" as the value for day-of-month, and the
	148	* 1st is a Saturday, the trigger will fire on Monday the 3rd, as it will not
	149	* 'jump' over the boundary of a month's days. The 'W' character can only be
	150	* specified when the day-of-month is a single day, not a range or list of days.
	151	* <P>
	152	* The 'L' and 'W' characters can also be combined for the day-of-month
	153	* expression to yield 'LW', which translates to "last weekday of the
	154	* month".
	155	* <P>
	156	* The '#' character is allowed for the day-of-week field. This character is
	157	* used to specify "the nth" XXX day of the month. For example, the
	158	* value of "6#3" in the day-of-week field means the third Friday of
	159	* the month (day 6 = Friday and "#3" = the 3rd one in the month).
	160	* Other examples: "2#1" = the first Monday of the month and
	161	* "4#5" = the fifth Wednesday of the month. Note that if you specify
	162	* "#5" and there is not 5 of the given day-of-week in the month, then
	163	* no firing will occur that month. If the '#' character is used, there can
	164	* only be one expression in the day-of-week field ("3#1,6#3" is
	165	* not valid, since there are two expressions).
	166	* <P>
	167	* <!--The 'C' character is allowed for the day-of-month and day-of-week fields.
	168	* This character is short-hand for "calendar". This means values are
	169	* calculated against the associated calendar, if any. If no calendar is
	170	* associated, then it is equivalent to having an all-inclusive calendar. A
	171	* value of "5C" in the day-of-month field means "the first day included by the
	172	* calendar on or after the 5th". A value of "1C" in the day-of-week field
	173	* means "the first day included by the calendar on or after Sunday".-->
	174	* <P>
	175	* The legal characters and the names of months and days of the week are not
	176	* case sensitive.
	177	*
	178	* <p>
	179	* <b>NOTES:</b>
	180	* <ul>
	181	* <li>Support for specifying both a day-of-week and a day-of-month value is
	182	* not complete (you'll need to use the '?' character in one of these fields).
	183	* </li>
	184	* <li>Overflowing ranges is supported - that is, having a larger number on
	185	* the left hand side than the right. You might do 22-2 to catch 10 o'clock
	186	* at night until 2 o'clock in the morning, or you might have NOV-FEB. It is
	187	* very important to note that overuse of overflowing ranges creates ranges
	188	* that don't make sense and no effort has been made to determine which
	189	* interpretation CronExpression chooses. An example would be
	190	* "0 0 14-6 ? * FRI-MON". </li>
	191	* </ul>
	192	* </p>
	193	*
	194	*
	195	* @author Sharada Jambula, James House
	196	* @author Contributions from Mads Henderson
	197	* @author Refactoring from CronTrigger to CronExpression by Aaron Craven
	198	*
	199	* Borrowed from quartz v2.3.1
	200	*
	201	*/
	202	public final class CronExpression implements Serializable, Cloneable {
	203
	204	private static final long serialVersionUID = 12423409423L;
	205
	206	protected static final int SECOND = 0;
	207	protected static final int MINUTE = 1;
	208	protected static final int HOUR = 2;
	209	protected static final int DAY_OF_MONTH = 3;
	210	protected static final int MONTH = 4;
	211	protected static final int DAY_OF_WEEK = 5;
	212	protected static final int YEAR = 6;
	213	protected static final int ALL_SPEC_INT = 99; // '*'
	214	protected static final int NO_SPEC_INT = 98; // '?'
	215	protected static final Integer ALL_SPEC = ALL_SPEC_INT;
	216	protected static final Integer NO_SPEC = NO_SPEC_INT;
	217
	218	protected static final Map<String, Integer> monthMap = new HashMap<String, Integer>(20);
	219	protected static final Map<String, Integer> dayMap = new HashMap<String, Integer>(60);
	220	static {
	221	monthMap.put("JAN", 0);
	222	monthMap.put("FEB", 1);
	223	monthMap.put("MAR", 2);
	224	monthMap.put("APR", 3);
	225	monthMap.put("MAY", 4);
	226	monthMap.put("JUN", 5);
	227	monthMap.put("JUL", 6);
	228	monthMap.put("AUG", 7);
	229	monthMap.put("SEP", 8);
	230	monthMap.put("OCT", 9);
	231	monthMap.put("NOV", 10);
	232	monthMap.put("DEC", 11);
	233
	234	dayMap.put("SUN", 1);
	235	dayMap.put("MON", 2);
	236	dayMap.put("TUE", 3);
	237	dayMap.put("WED", 4);
	238	dayMap.put("THU", 5);
	239	dayMap.put("FRI", 6);
	240	dayMap.put("SAT", 7);
	241	}
	242
	243	private final String cronExpression;
	244	private TimeZone timeZone = null;
	245	protected transient TreeSet<Integer> seconds;
	246	protected transient TreeSet<Integer> minutes;
	247	protected transient TreeSet<Integer> hours;
	248	protected transient TreeSet<Integer> daysOfMonth;
	249	protected transient TreeSet<Integer> months;
	250	protected transient TreeSet<Integer> daysOfWeek;
	251	protected transient TreeSet<Integer> years;
	252
	253	protected transient boolean lastdayOfWeek = false;
	254	protected transient int nthdayOfWeek = 0;
	255	protected transient boolean lastdayOfMonth = false;
	256	protected transient boolean nearestWeekday = false;
	257	protected transient int lastdayOffset = 0;
	258	protected transient boolean expressionParsed = false;
	259
	260	public static final int MAX_YEAR = Calendar.getInstance().get(Calendar.YEAR) + 100;
	261
	262	/**
	263	* Constructs a new <CODE>CronExpression</CODE> based on the specified
	264	* parameter.
	265	*
	266	* @param cronExpression String representation of the cron expression the
	267	* new object should represent
	268	* @throws java.text.ParseException
	269	* if the string expression cannot be parsed into a valid
	270	* <CODE>CronExpression</CODE>
	271	*/
	272	public CronExpression(String cronExpression) throws ParseException {
	273	if (cronExpression == null) {
	274	throw new IllegalArgumentException("cronExpression cannot be null");
	275	}
	276
	277	this.cronExpression = cronExpression.toUpperCase(Locale.US);
	278
	279	buildExpression(this.cronExpression);
	280	}
	281
	282	/**
	283	* Constructs a new {@code CronExpression} as a copy of an existing
	284	* instance.
	285	*
	286	* @param expression
	287	* The existing cron expression to be copied
	288	*/
	289	public CronExpression(CronExpression expression) {
	290	/*
	291	* We don't call the other constructor here since we need to swallow the
	292	* ParseException. We also elide some of the sanity checking as it is
	293	* not logically trippable.
	294	*/
	295	this.cronExpression = expression.getCronExpression();
	296	try {
	297	buildExpression(cronExpression);
	298	} catch (ParseException ex) {
	299	throw new AssertionError();
	300	}
	301	if (expression.getTimeZone() != null) {
	302	setTimeZone((TimeZone) expression.getTimeZone().clone());
	303	}
	304	}
	305
	306	/**
	307	* Indicates whether the given date satisfies the cron expression. Note that
	308	* milliseconds are ignored, so two Dates falling on different milliseconds
	309	* of the same second will always have the same result here.
	310	*
	311	* @param date the date to evaluate
	312	* @return a boolean indicating whether the given date satisfies the cron
	313	* expression
	314	*/
	315	public boolean isSatisfiedBy(Date date) {
	316	Calendar testDateCal = Calendar.getInstance(getTimeZone());
	317	testDateCal.setTime(date);
	318	testDateCal.set(Calendar.MILLISECOND, 0);
	319	Date originalDate = testDateCal.getTime();
	320
	321	testDateCal.add(Calendar.SECOND, -1);
	322
	323	Date timeAfter = getTimeAfter(testDateCal.getTime());
	324
	325	return ((timeAfter != null) && (timeAfter.equals(originalDate)));
	326	}
	327
	328	/**
	329	* Returns the next date/time <I>after</I> the given date/time which
	330	* satisfies the cron expression.
	331	*
	332	* @param date the date/time at which to begin the search for the next valid
	333	* date/time
	334	* @return the next valid date/time
	335	*/
	336	public Date getNextValidTimeAfter(Date date) {
	337	return getTimeAfter(date);
	338	}
	339
	340	/**
	341	* Returns the next date/time <I>after</I> the given date/time which does
	342	* <I>not</I> satisfy the expression
	343	*
	344	* @param date the date/time at which to begin the search for the next
	345	* invalid date/time
	346	* @return the next valid date/time
	347	*/
	348	public Date getNextInvalidTimeAfter(Date date) {
	349	long difference = 1000;
	350
	351	//move back to the nearest second so differences will be accurate
	352	Calendar adjustCal = Calendar.getInstance(getTimeZone());
	353	adjustCal.setTime(date);
	354	adjustCal.set(Calendar.MILLISECOND, 0);
	355	Date lastDate = adjustCal.getTime();
	356
	357	Date newDate;
	358
	359	//FUTURE_TODO: (QUARTZ-481) IMPROVE THIS! The following is a BAD solution to this problem. Performance will be very bad here, depending on the cron expression. It is, however A solution.
	360
	361	//keep getting the next included time until it's farther than one second
	362	// apart. At that point, lastDate is the last valid fire time. We return
	363	// the second immediately following it.
	364	while (difference == 1000) {
	365	newDate = getTimeAfter(lastDate);
	366	if(newDate == null)
	367	break;
	368
	369	difference = newDate.getTime() - lastDate.getTime();
	370
	371	if (difference == 1000) {
	372	lastDate = newDate;
	373	}
	374	}
	375
	376	return new Date(lastDate.getTime() + 1000);
	377	}
	378
	379	/**
	380	* Returns the time zone for which this <code>CronExpression</code>
	381	* will be resolved.
	382	*/
	383	public TimeZone getTimeZone() {
	384	if (timeZone == null) {
	385	timeZone = TimeZone.getDefault();
	386	}
	387
	388	return timeZone;
	389	}
	390
	391	/**
	392	* Sets the time zone for which this <code>CronExpression</code>
	393	* will be resolved.
	394	*/
	395	public void setTimeZone(TimeZone timeZone) {
	396	this.timeZone = timeZone;
	397	}
	398
	399	/**
	400	* Returns the string representation of the <CODE>CronExpression</CODE>
	401	*
	402	* @return a string representation of the <CODE>CronExpression</CODE>
	403	*/
	404	@Override
	405	public String toString() {
	406	return cronExpression;
	407	}
	408
	409	/**
	410	* Indicates whether the specified cron expression can be parsed into a
	411	* valid cron expression
	412	*
	413	* @param cronExpression the expression to evaluate
	414	* @return a boolean indicating whether the given expression is a valid cron
	415	* expression
	416	*/
	417	public static boolean isValidExpression(String cronExpression) {
	418
	419	try {
	420	new CronExpression(cronExpression);
	421	} catch (ParseException pe) {
	422	return false;
	423	}
	424
	425	return true;
	426	}
	427
	428	public static void validateExpression(String cronExpression) throws ParseException {
	429
	430	new CronExpression(cronExpression);
	431	}
	432
	433
	434	////////////////////////////////////////////////////////////////////////////
	435	//
	436	// Expression Parsing Functions
	437	//
	438	////////////////////////////////////////////////////////////////////////////
	439
	440	protected void buildExpression(String expression) throws ParseException {
	441	expressionParsed = true;
	442
	443	try {
	444
	445	if (seconds == null) {
	446	seconds = new TreeSet<Integer>();
	447	}
	448	if (minutes == null) {
	449	minutes = new TreeSet<Integer>();
	450	}
	451	if (hours == null) {
	452	hours = new TreeSet<Integer>();
	453	}
	454	if (daysOfMonth == null) {
	455	daysOfMonth = new TreeSet<Integer>();
	456	}
	457	if (months == null) {
	458	months = new TreeSet<Integer>();
	459	}
	460	if (daysOfWeek == null) {
	461	daysOfWeek = new TreeSet<Integer>();
	462	}
	463	if (years == null) {
	464	years = new TreeSet<Integer>();
	465	}
	466
	467	int exprOn = SECOND;
	468
	469	StringTokenizer exprsTok = new StringTokenizer(expression, " \t",
	470	false);
	471
	472	while (exprsTok.hasMoreTokens() && exprOn <= YEAR) {
	473	String expr = exprsTok.nextToken().trim();
	474
	475	// throw an exception if L is used with other days of the month
	476	if(exprOn == DAY_OF_MONTH && expr.indexOf('L') != -1 && expr.length() > 1 && expr.contains(",")) {
	477	throw new ParseException("Support for specifying 'L' and 'LW' with other days of the month is not implemented", -1);
	478	}
	479	// throw an exception if L is used with other days of the week
	480	if(exprOn == DAY_OF_WEEK && expr.indexOf('L') != -1 && expr.length() > 1 && expr.contains(",")) {
	481	throw new ParseException("Support for specifying 'L' with other days of the week is not implemented", -1);
	482	}
	483	if(exprOn == DAY_OF_WEEK && expr.indexOf('#') != -1 && expr.indexOf('#', expr.indexOf('#') +1) != -1) {
	484	throw new ParseException("Support for specifying multiple \"nth\" days is not implemented.", -1);
	485	}
	486
	487	StringTokenizer vTok = new StringTokenizer(expr, ",");
	488	while (vTok.hasMoreTokens()) {
	489	String v = vTok.nextToken();
	490	storeExpressionVals(0, v, exprOn);
	491	}
	492
	493	exprOn++;
	494	}
	495
	496	if (exprOn <= DAY_OF_WEEK) {
	497	throw new ParseException("Unexpected end of expression.",
	498	expression.length());
	499	}
	500
	501	if (exprOn <= YEAR) {
	502	storeExpressionVals(0, "*", YEAR);
	503	}
	504
	505	TreeSet<Integer> dow = getSet(DAY_OF_WEEK);
	506	TreeSet<Integer> dom = getSet(DAY_OF_MONTH);
	507
	508	// Copying the logic from the UnsupportedOperationException below
	509	boolean dayOfMSpec = !dom.contains(NO_SPEC);
	510	boolean dayOfWSpec = !dow.contains(NO_SPEC);
	511
	512	if (!dayOfMSpec \|\| dayOfWSpec) {
	513	if (!dayOfWSpec \|\| dayOfMSpec) {
	514	throw new ParseException(
	515	"Support for specifying both a day-of-week AND a day-of-month parameter is not implemented.", 0);
	516	}
	517	}
	518	} catch (ParseException pe) {
	519	throw pe;
	520	} catch (Exception e) {
	521	throw new ParseException("Illegal cron expression format ("
	522	+ e.toString() + ")", 0);
	523	}
	524	}
	525
	526	protected int storeExpressionVals(int pos, String s, int type)
	527	throws ParseException {
	528
	529	int incr = 0;
	530	int i = skipWhiteSpace(pos, s);
	531	if (i >= s.length()) {
	532	return i;
	533	}
	534	char c = s.charAt(i);
	535	if ((c >= 'A') && (c <= 'Z') && (!s.equals("L")) && (!s.equals("LW")) && (!s.matches("^L-[0-9]*[W]?"))) {
	536	String sub = s.substring(i, i + 3);
	537	int sval = -1;
	538	int eval = -1;
	539	if (type == MONTH) {
	540	sval = getMonthNumber(sub) + 1;
	541	if (sval <= 0) {
	542	throw new ParseException("Invalid Month value: '" + sub + "'", i);
	543	}
	544	if (s.length() > i + 3) {
	545	c = s.charAt(i + 3);
	546	if (c == '-') {
	547	i += 4;
	548	sub = s.substring(i, i + 3);
	549	eval = getMonthNumber(sub) + 1;
	550	if (eval <= 0) {
	551	throw new ParseException("Invalid Month value: '" + sub + "'", i);
	552	}
	553	}
	554	}
	555	} else if (type == DAY_OF_WEEK) {
	556	sval = getDayOfWeekNumber(sub);
	557	if (sval < 0) {
	558	throw new ParseException("Invalid Day-of-Week value: '"
	559	+ sub + "'", i);
	560	}
	561	if (s.length() > i + 3) {
	562	c = s.charAt(i + 3);
	563	if (c == '-') {
	564	i += 4;
	565	sub = s.substring(i, i + 3);
	566	eval = getDayOfWeekNumber(sub);
	567	if (eval < 0) {
	568	throw new ParseException(
	569	"Invalid Day-of-Week value: '" + sub
	570	+ "'", i);
	571	}
	572	} else if (c == '#') {
	573	try {
	574	i += 4;
	575	nthdayOfWeek = Integer.parseInt(s.substring(i));
	576	if (nthdayOfWeek < 1 \|\| nthdayOfWeek > 5) {
	577	throw new Exception();
	578	}
	579	} catch (Exception e) {
	580	throw new ParseException(
	581	"A numeric value between 1 and 5 must follow the '#' option",
	582	i);
	583	}
	584	} else if (c == 'L') {
	585	lastdayOfWeek = true;
	586	i++;
	587	}
	588	}
	589
	590	} else {
	591	throw new ParseException(
	592	"Illegal characters for this position: '" + sub + "'",
	593	i);
	594	}
	595	if (eval != -1) {
	596	incr = 1;
	597	}
	598	addToSet(sval, eval, incr, type);
	599	return (i + 3);
	600	}
	601
	602	if (c == '?') {
	603	i++;
	604	if ((i + 1) < s.length()
	605	&& (s.charAt(i) != ' ' && s.charAt(i + 1) != '\t')) {
	606	throw new ParseException("Illegal character after '?': "
	607	+ s.charAt(i), i);
	608	}
	609	if (type != DAY_OF_WEEK && type != DAY_OF_MONTH) {
	610	throw new ParseException(
	611	"'?' can only be specified for Day-of-Month or Day-of-Week.",
	612	i);
	613	}
	614	if (type == DAY_OF_WEEK && !lastdayOfMonth) {
	615	int val = daysOfMonth.last();
	616	if (val == NO_SPEC_INT) {
	617	throw new ParseException(
	618	"'?' can only be specified for Day-of-Month -OR- Day-of-Week.",
	619	i);
	620	}
	621	}
	622
	623	addToSet(NO_SPEC_INT, -1, 0, type);
	624	return i;
	625	}
	626
	627	if (c == '*' \|\| c == '/') {
	628	if (c == '*' && (i + 1) >= s.length()) {
	629	addToSet(ALL_SPEC_INT, -1, incr, type);
	630	return i + 1;
	631	} else if (c == '/'
	632	&& ((i + 1) >= s.length() \|\| s.charAt(i + 1) == ' ' \|\| s
	633	.charAt(i + 1) == '\t')) {
	634	throw new ParseException("'/' must be followed by an integer.", i);
	635	} else if (c == '*') {
	636	i++;
	637	}
	638	c = s.charAt(i);
	639	if (c == '/') { // is an increment specified?
	640	i++;
	641	if (i >= s.length()) {
	642	throw new ParseException("Unexpected end of string.", i);
	643	}
	644
	645	incr = getNumericValue(s, i);
	646
	647	i++;
	648	if (incr > 10) {
	649	i++;
	650	}
	651	checkIncrementRange(incr, type, i);
	652	} else {
	653	incr = 1;
	654	}
	655
	656	addToSet(ALL_SPEC_INT, -1, incr, type);
	657	return i;
	658	} else if (c == 'L') {
	659	i++;
	660	if (type == DAY_OF_MONTH) {
	661	lastdayOfMonth = true;
	662	}
	663	if (type == DAY_OF_WEEK) {
	664	addToSet(7, 7, 0, type);
	665	}
	666	if(type == DAY_OF_MONTH && s.length() > i) {
	667	c = s.charAt(i);
	668	if(c == '-') {
	669	ValueSet vs = getValue(0, s, i+1);
	670	lastdayOffset = vs.value;
	671	if(lastdayOffset > 30)
	672	throw new ParseException("Offset from last day must be <= 30", i+1);
	673	i = vs.pos;
	674	}
	675	if(s.length() > i) {
	676	c = s.charAt(i);
	677	if(c == 'W') {
	678	nearestWeekday = true;
	679	i++;
	680	}
	681	}
	682	}
	683	return i;
	684	} else if (c >= '0' && c <= '9') {
	685	int val = Integer.parseInt(String.valueOf(c));
	686	i++;
	687	if (i >= s.length()) {
	688	addToSet(val, -1, -1, type);
	689	} else {
	690	c = s.charAt(i);
	691	if (c >= '0' && c <= '9') {
	692	ValueSet vs = getValue(val, s, i);
	693	val = vs.value;
	694	i = vs.pos;
	695	}
	696	i = checkNext(i, s, val, type);
	697	return i;
	698	}
	699	} else {
	700	throw new ParseException("Unexpected character: " + c, i);
	701	}
	702
	703	return i;
	704	}
	705
	706	private void checkIncrementRange(int incr, int type, int idxPos) throws ParseException {
	707	if (incr > 59 && (type == SECOND \|\| type == MINUTE)) {
	708	throw new ParseException("Increment > 60 : " + incr, idxPos);
	709	} else if (incr > 23 && (type == HOUR)) {
	710	throw new ParseException("Increment > 24 : " + incr, idxPos);
	711	} else if (incr > 31 && (type == DAY_OF_MONTH)) {
	712	throw new ParseException("Increment > 31 : " + incr, idxPos);
	713	} else if (incr > 7 && (type == DAY_OF_WEEK)) {
	714	throw new ParseException("Increment > 7 : " + incr, idxPos);
	715	} else if (incr > 12 && (type == MONTH)) {
	716	throw new ParseException("Increment > 12 : " + incr, idxPos);
	717	}
	718	}
	719
	720	protected int checkNext(int pos, String s, int val, int type)
	721	throws ParseException {
	722
	723	int end = -1;
	724	int i = pos;
	725
	726	if (i >= s.length()) {
	727	addToSet(val, end, -1, type);
	728	return i;
	729	}
	730
	731	char c = s.charAt(pos);
	732
	733	if (c == 'L') {
	734	if (type == DAY_OF_WEEK) {
	735	if(val < 1 \|\| val > 7)
	736	throw new ParseException("Day-of-Week values must be between 1 and 7", -1);
	737	lastdayOfWeek = true;
	738	} else {
	739	throw new ParseException("'L' option is not valid here. (pos=" + i + ")", i);
	740	}
	741	TreeSet<Integer> set = getSet(type);
	742	set.add(val);
	743	i++;
	744	return i;
	745	}
	746
	747	if (c == 'W') {
	748	if (type == DAY_OF_MONTH) {
	749	nearestWeekday = true;
	750	} else {
	751	throw new ParseException("'W' option is not valid here. (pos=" + i + ")", i);
	752	}
	753	if(val > 31)
	754	throw new ParseException("The 'W' option does not make sense with values larger than 31 (max number of days in a month)", i);
	755	TreeSet<Integer> set = getSet(type);
	756	set.add(val);
	757	i++;
	758	return i;
	759	}
	760
	761	if (c == '#') {
	762	if (type != DAY_OF_WEEK) {
	763	throw new ParseException("'#' option is not valid here. (pos=" + i + ")", i);
	764	}
	765	i++;
	766	try {
	767	nthdayOfWeek = Integer.parseInt(s.substring(i));
	768	if (nthdayOfWeek < 1 \|\| nthdayOfWeek > 5) {
	769	throw new Exception();
	770	}
	771	} catch (Exception e) {
	772	throw new ParseException(
	773	"A numeric value between 1 and 5 must follow the '#' option",
	774	i);
	775	}
	776
	777	TreeSet<Integer> set = getSet(type);
	778	set.add(val);
	779	i++;
	780	return i;
	781	}
	782
	783	if (c == '-') {
	784	i++;
	785	c = s.charAt(i);
	786	int v = Integer.parseInt(String.valueOf(c));
	787	end = v;
	788	i++;
	789	if (i >= s.length()) {
	790	addToSet(val, end, 1, type);
	791	return i;
	792	}
	793	c = s.charAt(i);
	794	if (c >= '0' && c <= '9') {
	795	ValueSet vs = getValue(v, s, i);
	796	end = vs.value;
	797	i = vs.pos;
	798	}
	799	if (i < s.length() && ((c = s.charAt(i)) == '/')) {
	800	i++;
	801	c = s.charAt(i);
	802	int v2 = Integer.parseInt(String.valueOf(c));
	803	i++;
	804	if (i >= s.length()) {
	805	addToSet(val, end, v2, type);
	806	return i;
	807	}
	808	c = s.charAt(i);
	809	if (c >= '0' && c <= '9') {
	810	ValueSet vs = getValue(v2, s, i);
	811	int v3 = vs.value;
	812	addToSet(val, end, v3, type);
	813	i = vs.pos;
	814	return i;
	815	} else {
	816	addToSet(val, end, v2, type);
	817	return i;
	818	}
	819	} else {
	820	addToSet(val, end, 1, type);
	821	return i;
	822	}
	823	}
	824
	825	if (c == '/') {
	826	if ((i + 1) >= s.length() \|\| s.charAt(i + 1) == ' ' \|\| s.charAt(i + 1) == '\t') {
	827	throw new ParseException("'/' must be followed by an integer.", i);
	828	}
	829
	830	i++;
	831	c = s.charAt(i);
	832	int v2 = Integer.parseInt(String.valueOf(c));
	833	i++;
	834	if (i >= s.length()) {
	835	checkIncrementRange(v2, type, i);
	836	addToSet(val, end, v2, type);
	837	return i;
	838	}
	839	c = s.charAt(i);
	840	if (c >= '0' && c <= '9') {
	841	ValueSet vs = getValue(v2, s, i);
	842	int v3 = vs.value;
	843	checkIncrementRange(v3, type, i);
	844	addToSet(val, end, v3, type);
	845	i = vs.pos;
	846	return i;
	847	} else {
	848	throw new ParseException("Unexpected character '" + c + "' after '/'", i);
	849	}
	850	}
	851
	852	addToSet(val, end, 0, type);
	853	i++;
	854	return i;
	855	}
	856
	857	public String getCronExpression() {
	858	return cronExpression;
	859	}
	860
	861	public String getExpressionSummary() {
	862	StringBuilder buf = new StringBuilder();
	863
	864	buf.append("seconds: ");
	865	buf.append(getExpressionSetSummary(seconds));
	866	buf.append("\n");
	867	buf.append("minutes: ");
	868	buf.append(getExpressionSetSummary(minutes));
	869	buf.append("\n");
	870	buf.append("hours: ");
	871	buf.append(getExpressionSetSummary(hours));
	872	buf.append("\n");
	873	buf.append("daysOfMonth: ");
	874	buf.append(getExpressionSetSummary(daysOfMonth));
	875	buf.append("\n");
	876	buf.append("months: ");
	877	buf.append(getExpressionSetSummary(months));
	878	buf.append("\n");
	879	buf.append("daysOfWeek: ");
	880	buf.append(getExpressionSetSummary(daysOfWeek));
	881	buf.append("\n");
	882	buf.append("lastdayOfWeek: ");
	883	buf.append(lastdayOfWeek);
	884	buf.append("\n");
	885	buf.append("nearestWeekday: ");
	886	buf.append(nearestWeekday);
	887	buf.append("\n");
	888	buf.append("NthDayOfWeek: ");
	889	buf.append(nthdayOfWeek);
	890	buf.append("\n");
	891	buf.append("lastdayOfMonth: ");
	892	buf.append(lastdayOfMonth);
	893	buf.append("\n");
	894	buf.append("years: ");
	895	buf.append(getExpressionSetSummary(years));
	896	buf.append("\n");
	897
	898	return buf.toString();
	899	}
	900
	901	protected String getExpressionSetSummary(java.util.Set<Integer> set) {
	902
	903	if (set.contains(NO_SPEC)) {
	904	return "?";
	905	}
	906	if (set.contains(ALL_SPEC)) {
	907	return "*";
	908	}
	909
	910	StringBuilder buf = new StringBuilder();
	911
	912	Iterator<Integer> itr = set.iterator();
	913	boolean first = true;
	914	while (itr.hasNext()) {
	915	Integer iVal = itr.next();
	916	String val = iVal.toString();
	917	if (!first) {
	918	buf.append(",");
	919	}
	920	buf.append(val);
	921	first = false;
	922	}
	923
	924	return buf.toString();
	925	}
	926
	927	protected String getExpressionSetSummary(java.util.ArrayList<Integer> list) {
	928
	929	if (list.contains(NO_SPEC)) {
	930	return "?";
	931	}
	932	if (list.contains(ALL_SPEC)) {
	933	return "*";
	934	}
	935
	936	StringBuilder buf = new StringBuilder();
	937
	938	Iterator<Integer> itr = list.iterator();
	939	boolean first = true;
	940	while (itr.hasNext()) {
	941	Integer iVal = itr.next();
	942	String val = iVal.toString();
	943	if (!first) {
	944	buf.append(",");
	945	}
	946	buf.append(val);
	947	first = false;
	948	}
	949
	950	return buf.toString();
	951	}
	952
	953	protected int skipWhiteSpace(int i, String s) {
	954	for (; i < s.length() && (s.charAt(i) == ' ' \|\| s.charAt(i) == '\t'); i++) {
	955	}
	956
	957	return i;
	958	}
	959
	960	protected int findNextWhiteSpace(int i, String s) {
	961	for (; i < s.length() && (s.charAt(i) != ' ' \|\| s.charAt(i) != '\t'); i++) {
	962	}
	963
	964	return i;
	965	}
	966
	967	protected void addToSet(int val, int end, int incr, int type)
	968	throws ParseException {
	969
	970	TreeSet<Integer> set = getSet(type);
	971
	972	if (type == SECOND \|\| type == MINUTE) {
	973	if ((val < 0 \|\| val > 59 \|\| end > 59) && (val != ALL_SPEC_INT)) {
	974	throw new ParseException(
	975	"Minute and Second values must be between 0 and 59",
	976	-1);
	977	}
	978	} else if (type == HOUR) {
	979	if ((val < 0 \|\| val > 23 \|\| end > 23) && (val != ALL_SPEC_INT)) {
	980	throw new ParseException(
	981	"Hour values must be between 0 and 23", -1);
	982	}
	983	} else if (type == DAY_OF_MONTH) {
	984	if ((val < 1 \|\| val > 31 \|\| end > 31) && (val != ALL_SPEC_INT)
	985	&& (val != NO_SPEC_INT)) {
	986	throw new ParseException(
	987	"Day of month values must be between 1 and 31", -1);
	988	}
	989	} else if (type == MONTH) {
	990	if ((val < 1 \|\| val > 12 \|\| end > 12) && (val != ALL_SPEC_INT)) {
	991	throw new ParseException(
	992	"Month values must be between 1 and 12", -1);
	993	}
	994	} else if (type == DAY_OF_WEEK) {
	995	if ((val == 0 \|\| val > 7 \|\| end > 7) && (val != ALL_SPEC_INT)
	996	&& (val != NO_SPEC_INT)) {
	997	throw new ParseException(
	998	"Day-of-Week values must be between 1 and 7", -1);
	999	}
	1000	}
	1001
	1002	if ((incr == 0 \|\| incr == -1) && val != ALL_SPEC_INT) {
	1003	if (val != -1) {
	1004	set.add(val);
	1005	} else {
	1006	set.add(NO_SPEC);
	1007	}
	1008
	1009	return;
	1010	}
	1011
	1012	int startAt = val;
	1013	int stopAt = end;
	1014
	1015	if (val == ALL_SPEC_INT && incr <= 0) {
	1016	incr = 1;
	1017	set.add(ALL_SPEC); // put in a marker, but also fill values
	1018	}
	1019
	1020	if (type == SECOND \|\| type == MINUTE) {
	1021	if (stopAt == -1) {
	1022	stopAt = 59;
	1023	}
	1024	if (startAt == -1 \|\| startAt == ALL_SPEC_INT) {
	1025	startAt = 0;
	1026	}
	1027	} else if (type == HOUR) {
	1028	if (stopAt == -1) {
	1029	stopAt = 23;
	1030	}
	1031	if (startAt == -1 \|\| startAt == ALL_SPEC_INT) {
	1032	startAt = 0;
	1033	}
	1034	} else if (type == DAY_OF_MONTH) {
	1035	if (stopAt == -1) {
	1036	stopAt = 31;
	1037	}
	1038	if (startAt == -1 \|\| startAt == ALL_SPEC_INT) {
	1039	startAt = 1;
	1040	}
	1041	} else if (type == MONTH) {
	1042	if (stopAt == -1) {
	1043	stopAt = 12;
	1044	}
	1045	if (startAt == -1 \|\| startAt == ALL_SPEC_INT) {
	1046	startAt = 1;
	1047	}
	1048	} else if (type == DAY_OF_WEEK) {
	1049	if (stopAt == -1) {
	1050	stopAt = 7;
	1051	}
	1052	if (startAt == -1 \|\| startAt == ALL_SPEC_INT) {
	1053	startAt = 1;
	1054	}
	1055	} else if (type == YEAR) {
	1056	if (stopAt == -1) {
	1057	stopAt = MAX_YEAR;
	1058	}
	1059	if (startAt == -1 \|\| startAt == ALL_SPEC_INT) {
	1060	startAt = 1970;
	1061	}
	1062	}
	1063
	1064	// if the end of the range is before the start, then we need to overflow into
	1065	// the next day, month etc. This is done by adding the maximum amount for that
	1066	// type, and using modulus max to determine the value being added.
	1067	int max = -1;
	1068	if (stopAt < startAt) {
	1069	switch (type) {
	1070	case SECOND : max = 60; break;
	1071	case MINUTE : max = 60; break;
	1072	case HOUR : max = 24; break;
	1073	case MONTH : max = 12; break;
	1074	case DAY_OF_WEEK : max = 7; break;
	1075	case DAY_OF_MONTH : max = 31; break;
	1076	case YEAR : throw new IllegalArgumentException("Start year must be less than stop year");
	1077	default : throw new IllegalArgumentException("Unexpected type encountered");
	1078	}
	1079	stopAt += max;
	1080	}
	1081
	1082	for (int i = startAt; i <= stopAt; i += incr) {
	1083	if (max == -1) {
	1084	// ie: there's no max to overflow over
	1085	set.add(i);
	1086	} else {
	1087	// take the modulus to get the real value
	1088	int i2 = i % max;
	1089
	1090	// 1-indexed ranges should not include 0, and should include their max
	1091	if (i2 == 0 && (type == MONTH \|\| type == DAY_OF_WEEK \|\| type == DAY_OF_MONTH) ) {
	1092	i2 = max;
	1093	}
	1094
	1095	set.add(i2);
	1096	}
	1097	}
	1098	}
	1099
	1100	TreeSet<Integer> getSet(int type) {
	1101	switch (type) {
	1102	case SECOND:
	1103	return seconds;
	1104	case MINUTE:
	1105	return minutes;
	1106	case HOUR:
	1107	return hours;
	1108	case DAY_OF_MONTH:
	1109	return daysOfMonth;
	1110	case MONTH:
	1111	return months;
	1112	case DAY_OF_WEEK:
	1113	return daysOfWeek;
	1114	case YEAR:
	1115	return years;
	1116	default:
	1117	return null;
	1118	}
	1119	}
	1120
	1121	protected ValueSet getValue(int v, String s, int i) {
	1122	char c = s.charAt(i);
	1123	StringBuilder s1 = new StringBuilder(String.valueOf(v));
	1124	while (c >= '0' && c <= '9') {
	1125	s1.append(c);
	1126	i++;
	1127	if (i >= s.length()) {
	1128	break;
	1129	}
	1130	c = s.charAt(i);
	1131	}
	1132	ValueSet val = new ValueSet();
	1133
	1134	val.pos = (i < s.length()) ? i : i + 1;
	1135	val.value = Integer.parseInt(s1.toString());
	1136	return val;
	1137	}
	1138
	1139	protected int getNumericValue(String s, int i) {
	1140	int endOfVal = findNextWhiteSpace(i, s);
	1141	String val = s.substring(i, endOfVal);
	1142	return Integer.parseInt(val);
	1143	}
	1144
	1145	protected int getMonthNumber(String s) {
	1146	Integer integer = monthMap.get(s);
	1147
	1148	if (integer == null) {
	1149	return -1;
	1150	}
	1151
	1152	return integer;
	1153	}
	1154
	1155	protected int getDayOfWeekNumber(String s) {
	1156	Integer integer = dayMap.get(s);
	1157
	1158	if (integer == null) {
	1159	return -1;
	1160	}
	1161
	1162	return integer;
	1163	}
	1164
	1165	////////////////////////////////////////////////////////////////////////////
	1166	//
	1167	// Computation Functions
	1168	//
	1169	////////////////////////////////////////////////////////////////////////////
	1170
	1171	public Date getTimeAfter(Date afterTime) {
	1172
	1173	// Computation is based on Gregorian year only.
	1174	Calendar cl = new java.util.GregorianCalendar(getTimeZone());
	1175
	1176	// move ahead one second, since we're computing the time after the
	1177	// given time
	1178	afterTime = new Date(afterTime.getTime() + 1000);
	1179	// CronTrigger does not deal with milliseconds
	1180	cl.setTime(afterTime);
	1181	cl.set(Calendar.MILLISECOND, 0);
	1182
	1183	boolean gotOne = false;
	1184	// loop until we've computed the next time, or we've past the endTime
	1185	while (!gotOne) {
	1186
	1187	//if (endTime != null && cl.getTime().after(endTime)) return null;
	1188	if(cl.get(Calendar.YEAR) > 2999) { // prevent endless loop...
	1189	return null;
	1190	}
	1191
	1192	SortedSet<Integer> st = null;
	1193	int t = 0;
	1194
	1195	int sec = cl.get(Calendar.SECOND);
	1196	int min = cl.get(Calendar.MINUTE);
	1197
	1198	// get second.................................................
	1199	st = seconds.tailSet(sec);
	1200	if (st != null && st.size() != 0) {
	1201	sec = st.first();
	1202	} else {
	1203	sec = seconds.first();
	1204	min++;
	1205	cl.set(Calendar.MINUTE, min);
	1206	}
	1207	cl.set(Calendar.SECOND, sec);
	1208
	1209	min = cl.get(Calendar.MINUTE);
	1210	int hr = cl.get(Calendar.HOUR_OF_DAY);
	1211	t = -1;
	1212
	1213	// get minute.................................................
	1214	st = minutes.tailSet(min);
	1215	if (st != null && st.size() != 0) {
	1216	t = min;
	1217	min = st.first();
	1218	} else {
	1219	min = minutes.first();
	1220	hr++;
	1221	}
	1222	if (min != t) {
	1223	cl.set(Calendar.SECOND, 0);
	1224	cl.set(Calendar.MINUTE, min);
	1225	setCalendarHour(cl, hr);
	1226	continue;
	1227	}
	1228	cl.set(Calendar.MINUTE, min);
	1229
	1230	hr = cl.get(Calendar.HOUR_OF_DAY);
	1231	int day = cl.get(Calendar.DAY_OF_MONTH);
	1232	t = -1;
	1233
	1234	// get hour...................................................
	1235	st = hours.tailSet(hr);
	1236	if (st != null && st.size() != 0) {
	1237	t = hr;
	1238	hr = st.first();
	1239	} else {
	1240	hr = hours.first();
	1241	day++;
	1242	}
	1243	if (hr != t) {
	1244	cl.set(Calendar.SECOND, 0);
	1245	cl.set(Calendar.MINUTE, 0);
	1246	cl.set(Calendar.DAY_OF_MONTH, day);
	1247	setCalendarHour(cl, hr);
	1248	continue;
	1249	}
	1250	cl.set(Calendar.HOUR_OF_DAY, hr);
	1251
	1252	day = cl.get(Calendar.DAY_OF_MONTH);
	1253	int mon = cl.get(Calendar.MONTH) + 1;
	1254	// '+ 1' because calendar is 0-based for this field, and we are
	1255	// 1-based
	1256	t = -1;
	1257	int tmon = mon;
	1258
	1259	// get day...................................................
	1260	boolean dayOfMSpec = !daysOfMonth.contains(NO_SPEC);
	1261	boolean dayOfWSpec = !daysOfWeek.contains(NO_SPEC);
	1262	if (dayOfMSpec && !dayOfWSpec) { // get day by day of month rule
	1263	st = daysOfMonth.tailSet(day);
	1264	if (lastdayOfMonth) {
	1265	if(!nearestWeekday) {
	1266	t = day;
	1267	day = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
	1268	day -= lastdayOffset;
	1269	if(t > day) {
	1270	mon++;
	1271	if(mon > 12) {
	1272	mon = 1;
	1273	tmon = 3333; // ensure test of mon != tmon further below fails
	1274	cl.add(Calendar.YEAR, 1);
	1275	}
	1276	day = 1;
	1277	}
	1278	} else {
	1279	t = day;
	1280	day = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
	1281	day -= lastdayOffset;
	1282
	1283	java.util.Calendar tcal = java.util.Calendar.getInstance(getTimeZone());
	1284	tcal.set(Calendar.SECOND, 0);
	1285	tcal.set(Calendar.MINUTE, 0);
	1286	tcal.set(Calendar.HOUR_OF_DAY, 0);
	1287	tcal.set(Calendar.DAY_OF_MONTH, day);
	1288	tcal.set(Calendar.MONTH, mon - 1);
	1289	tcal.set(Calendar.YEAR, cl.get(Calendar.YEAR));
	1290
	1291	int ldom = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
	1292	int dow = tcal.get(Calendar.DAY_OF_WEEK);
	1293
	1294	if(dow == Calendar.SATURDAY && day == 1) {
	1295	day += 2;
	1296	} else if(dow == Calendar.SATURDAY) {
	1297	day -= 1;
	1298	} else if(dow == Calendar.SUNDAY && day == ldom) {
	1299	day -= 2;
	1300	} else if(dow == Calendar.SUNDAY) {
	1301	day += 1;
	1302	}
	1303
	1304	tcal.set(Calendar.SECOND, sec);
	1305	tcal.set(Calendar.MINUTE, min);
	1306	tcal.set(Calendar.HOUR_OF_DAY, hr);
	1307	tcal.set(Calendar.DAY_OF_MONTH, day);
	1308	tcal.set(Calendar.MONTH, mon - 1);
	1309	Date nTime = tcal.getTime();
	1310	if(nTime.before(afterTime)) {
	1311	day = 1;
	1312	mon++;
	1313	}
	1314	}
	1315	} else if(nearestWeekday) {
	1316	t = day;
	1317	day = daysOfMonth.first();
	1318
	1319	java.util.Calendar tcal = java.util.Calendar.getInstance(getTimeZone());
	1320	tcal.set(Calendar.SECOND, 0);
	1321	tcal.set(Calendar.MINUTE, 0);
	1322	tcal.set(Calendar.HOUR_OF_DAY, 0);
	1323	tcal.set(Calendar.DAY_OF_MONTH, day);
	1324	tcal.set(Calendar.MONTH, mon - 1);
	1325	tcal.set(Calendar.YEAR, cl.get(Calendar.YEAR));
	1326
	1327	int ldom = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
	1328	int dow = tcal.get(Calendar.DAY_OF_WEEK);
	1329
	1330	if(dow == Calendar.SATURDAY && day == 1) {
	1331	day += 2;
	1332	} else if(dow == Calendar.SATURDAY) {
	1333	day -= 1;
	1334	} else if(dow == Calendar.SUNDAY && day == ldom) {
	1335	day -= 2;
	1336	} else if(dow == Calendar.SUNDAY) {
	1337	day += 1;
	1338	}
	1339
	1340
	1341	tcal.set(Calendar.SECOND, sec);
	1342	tcal.set(Calendar.MINUTE, min);
	1343	tcal.set(Calendar.HOUR_OF_DAY, hr);
	1344	tcal.set(Calendar.DAY_OF_MONTH, day);
	1345	tcal.set(Calendar.MONTH, mon - 1);
	1346	Date nTime = tcal.getTime();
	1347	if(nTime.before(afterTime)) {
	1348	day = daysOfMonth.first();
	1349	mon++;
	1350	}
	1351	} else if (st != null && st.size() != 0) {
	1352	t = day;
	1353	day = st.first();
	1354	// make sure we don't over-run a short month, such as february
	1355	int lastDay = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
	1356	if (day > lastDay) {
	1357	day = daysOfMonth.first();
	1358	mon++;
	1359	}
	1360	} else {
	1361	day = daysOfMonth.first();
	1362	mon++;
	1363	}
	1364
	1365	if (day != t \|\| mon != tmon) {
	1366	cl.set(Calendar.SECOND, 0);
	1367	cl.set(Calendar.MINUTE, 0);
	1368	cl.set(Calendar.HOUR_OF_DAY, 0);
	1369	cl.set(Calendar.DAY_OF_MONTH, day);
	1370	cl.set(Calendar.MONTH, mon - 1);
	1371	// '- 1' because calendar is 0-based for this field, and we
	1372	// are 1-based
	1373	continue;
	1374	}
	1375	} else if (dayOfWSpec && !dayOfMSpec) { // get day by day of week rule
	1376	if (lastdayOfWeek) { // are we looking for the last XXX day of
	1377	// the month?
	1378	int dow = daysOfWeek.first(); // desired
	1379	// d-o-w
	1380	int cDow = cl.get(Calendar.DAY_OF_WEEK); // current d-o-w
	1381	int daysToAdd = 0;
	1382	if (cDow < dow) {
	1383	daysToAdd = dow - cDow;
	1384	}
	1385	if (cDow > dow) {
	1386	daysToAdd = dow + (7 - cDow);
	1387	}
	1388
	1389	int lDay = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
	1390
	1391	if (day + daysToAdd > lDay) { // did we already miss the
	1392	// last one?
	1393	cl.set(Calendar.SECOND, 0);
	1394	cl.set(Calendar.MINUTE, 0);
	1395	cl.set(Calendar.HOUR_OF_DAY, 0);
	1396	cl.set(Calendar.DAY_OF_MONTH, 1);
	1397	cl.set(Calendar.MONTH, mon);
	1398	// no '- 1' here because we are promoting the month
	1399	continue;
	1400	}
	1401
	1402	// find date of last occurrence of this day in this month...
	1403	while ((day + daysToAdd + 7) <= lDay) {
	1404	daysToAdd += 7;
	1405	}
	1406
	1407	day += daysToAdd;
	1408
	1409	if (daysToAdd > 0) {
	1410	cl.set(Calendar.SECOND, 0);
	1411	cl.set(Calendar.MINUTE, 0);
	1412	cl.set(Calendar.HOUR_OF_DAY, 0);
	1413	cl.set(Calendar.DAY_OF_MONTH, day);
	1414	cl.set(Calendar.MONTH, mon - 1);
	1415	// '- 1' here because we are not promoting the month
	1416	continue;
	1417	}
	1418
	1419	} else if (nthdayOfWeek != 0) {
	1420	// are we looking for the Nth XXX day in the month?
	1421	int dow = daysOfWeek.first(); // desired
	1422	// d-o-w
	1423	int cDow = cl.get(Calendar.DAY_OF_WEEK); // current d-o-w
	1424	int daysToAdd = 0;
	1425	if (cDow < dow) {
	1426	daysToAdd = dow - cDow;
	1427	} else if (cDow > dow) {
	1428	daysToAdd = dow + (7 - cDow);
	1429	}
	1430
	1431	boolean dayShifted = false;
	1432	if (daysToAdd > 0) {
	1433	dayShifted = true;
	1434	}
	1435
	1436	day += daysToAdd;
	1437	int weekOfMonth = day / 7;
	1438	if (day % 7 > 0) {
	1439	weekOfMonth++;
	1440	}
	1441
	1442	daysToAdd = (nthdayOfWeek - weekOfMonth) * 7;
	1443	day += daysToAdd;
	1444	if (daysToAdd < 0
	1445	\|\| day > getLastDayOfMonth(mon, cl
	1446	.get(Calendar.YEAR))) {
	1447	cl.set(Calendar.SECOND, 0);
	1448	cl.set(Calendar.MINUTE, 0);
	1449	cl.set(Calendar.HOUR_OF_DAY, 0);
	1450	cl.set(Calendar.DAY_OF_MONTH, 1);
	1451	cl.set(Calendar.MONTH, mon);
	1452	// no '- 1' here because we are promoting the month
	1453	continue;
	1454	} else if (daysToAdd > 0 \|\| dayShifted) {
	1455	cl.set(Calendar.SECOND, 0);
	1456	cl.set(Calendar.MINUTE, 0);
	1457	cl.set(Calendar.HOUR_OF_DAY, 0);
	1458	cl.set(Calendar.DAY_OF_MONTH, day);
	1459	cl.set(Calendar.MONTH, mon - 1);
	1460	// '- 1' here because we are NOT promoting the month
	1461	continue;
	1462	}
	1463	} else {
	1464	int cDow = cl.get(Calendar.DAY_OF_WEEK); // current d-o-w
	1465	int dow = daysOfWeek.first(); // desired
	1466	// d-o-w
	1467	st = daysOfWeek.tailSet(cDow);
	1468	if (st != null && st.size() > 0) {
	1469	dow = st.first();
	1470	}
	1471
	1472	int daysToAdd = 0;
	1473	if (cDow < dow) {
	1474	daysToAdd = dow - cDow;
	1475	}
	1476	if (cDow > dow) {
	1477	daysToAdd = dow + (7 - cDow);
	1478	}
	1479
	1480	int lDay = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
	1481
	1482	if (day + daysToAdd > lDay) { // will we pass the end of
	1483	// the month?
	1484	cl.set(Calendar.SECOND, 0);
	1485	cl.set(Calendar.MINUTE, 0);
	1486	cl.set(Calendar.HOUR_OF_DAY, 0);
	1487	cl.set(Calendar.DAY_OF_MONTH, 1);
	1488	cl.set(Calendar.MONTH, mon);
	1489	// no '- 1' here because we are promoting the month
	1490	continue;
	1491	} else if (daysToAdd > 0) { // are we swithing days?
	1492	cl.set(Calendar.SECOND, 0);
	1493	cl.set(Calendar.MINUTE, 0);
	1494	cl.set(Calendar.HOUR_OF_DAY, 0);
	1495	cl.set(Calendar.DAY_OF_MONTH, day + daysToAdd);
	1496	cl.set(Calendar.MONTH, mon - 1);
	1497	// '- 1' because calendar is 0-based for this field,
	1498	// and we are 1-based
	1499	continue;
	1500	}
	1501	}
	1502	} else { // dayOfWSpec && !dayOfMSpec
	1503	throw new UnsupportedOperationException(
	1504	"Support for specifying both a day-of-week AND a day-of-month parameter is not implemented.");
	1505	}
	1506	cl.set(Calendar.DAY_OF_MONTH, day);
	1507
	1508	mon = cl.get(Calendar.MONTH) + 1;
	1509	// '+ 1' because calendar is 0-based for this field, and we are
	1510	// 1-based
	1511	int year = cl.get(Calendar.YEAR);
	1512	t = -1;
	1513
	1514	// test for expressions that never generate a valid fire date,
	1515	// but keep looping...
	1516	if (year > MAX_YEAR) {
	1517	return null;
	1518	}
	1519
	1520	// get month...................................................
	1521	st = months.tailSet(mon);
	1522	if (st != null && st.size() != 0) {
	1523	t = mon;
	1524	mon = st.first();
	1525	} else {
	1526	mon = months.first();
	1527	year++;
	1528	}
	1529	if (mon != t) {
	1530	cl.set(Calendar.SECOND, 0);
	1531	cl.set(Calendar.MINUTE, 0);
	1532	cl.set(Calendar.HOUR_OF_DAY, 0);
	1533	cl.set(Calendar.DAY_OF_MONTH, 1);
	1534	cl.set(Calendar.MONTH, mon - 1);
	1535	// '- 1' because calendar is 0-based for this field, and we are
	1536	// 1-based
	1537	cl.set(Calendar.YEAR, year);
	1538	continue;
	1539	}
	1540	cl.set(Calendar.MONTH, mon - 1);
	1541	// '- 1' because calendar is 0-based for this field, and we are
	1542	// 1-based
	1543
	1544	year = cl.get(Calendar.YEAR);
	1545	t = -1;
	1546
	1547	// get year...................................................
	1548	st = years.tailSet(year);
	1549	if (st != null && st.size() != 0) {
	1550	t = year;
	1551	year = st.first();
	1552	} else {
	1553	return null; // ran out of years...
	1554	}
	1555
	1556	if (year != t) {
	1557	cl.set(Calendar.SECOND, 0);
	1558	cl.set(Calendar.MINUTE, 0);
	1559	cl.set(Calendar.HOUR_OF_DAY, 0);
	1560	cl.set(Calendar.DAY_OF_MONTH, 1);
	1561	cl.set(Calendar.MONTH, 0);
	1562	// '- 1' because calendar is 0-based for this field, and we are
	1563	// 1-based
	1564	cl.set(Calendar.YEAR, year);
	1565	continue;
	1566	}
	1567	cl.set(Calendar.YEAR, year);
	1568
	1569	gotOne = true;
	1570	} // while( !done )
	1571
	1572	return cl.getTime();
	1573	}
	1574
	1575	/**
	1576	* Advance the calendar to the particular hour paying particular attention
	1577	* to daylight saving problems.
	1578	*
	1579	* @param cal the calendar to operate on
	1580	* @param hour the hour to set
	1581	*/
	1582	protected void setCalendarHour(Calendar cal, int hour) {
	1583	cal.set(java.util.Calendar.HOUR_OF_DAY, hour);
	1584	if (cal.get(java.util.Calendar.HOUR_OF_DAY) != hour && hour != 24) {
	1585	cal.set(java.util.Calendar.HOUR_OF_DAY, hour + 1);
	1586	}
	1587	}
	1588
	1589	/**
	1590	* NOT YET IMPLEMENTED: Returns the time before the given time
	1591	* that the <code>CronExpression</code> matches.
	1592	*/
	1593	public Date getTimeBefore(Date endTime) {
	1594	// FUTURE_TODO: implement QUARTZ-423
	1595	return null;
	1596	}
	1597
	1598	/**
	1599	* NOT YET IMPLEMENTED: Returns the final time that the
	1600	* <code>CronExpression</code> will match.
	1601	*/
	1602	public Date getFinalFireTime() {
	1603	// FUTURE_TODO: implement QUARTZ-423
	1604	return null;
	1605	}
	1606
	1607	protected boolean isLeapYear(int year) {
	1608	return ((year % 4 == 0 && year % 100 != 0) \|\| (year % 400 == 0));
	1609	}
	1610
	1611	protected int getLastDayOfMonth(int monthNum, int year) {
	1612
	1613	switch (monthNum) {
	1614	case 1:
	1615	return 31;
	1616	case 2:
	1617	return (isLeapYear(year)) ? 29 : 28;
	1618	case 3:
	1619	return 31;
	1620	case 4:
	1621	return 30;
	1622	case 5:
	1623	return 31;
	1624	case 6:
	1625	return 30;
	1626	case 7:
	1627	return 31;
	1628	case 8:
	1629	return 31;
	1630	case 9:
	1631	return 30;
	1632	case 10:
	1633	return 31;
	1634	case 11:
	1635	return 30;
	1636	case 12:
	1637	return 31;
	1638	default:
	1639	throw new IllegalArgumentException("Illegal month number: "
	1640	+ monthNum);
	1641	}
	1642	}
	1643
	1644
	1645	private void readObject(java.io.ObjectInputStream stream)
	1646	throws java.io.IOException, ClassNotFoundException {
	1647
	1648	stream.defaultReadObject();
	1649	try {
	1650	buildExpression(cronExpression);
	1651	} catch (Exception ignore) {
	1652	} // never happens
	1653	}
	1654
	1655	@Override
	1656	@Deprecated
	1657	public Object clone() {
	1658	return new CronExpression(this);
	1659	}
	1660	}
	1661
	1662	class ValueSet {
	1663	public int value;
	1664
	1665	public int pos;
	1666	}