tms /src/main/java/com/wcs/sys/ejbtimer/util/CronExpression.java

Language Java Lines 1649
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package com.wcs.sys.ejbtimer.util;

import java.io.Serializable;
import java.text.ParseException;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Locale;
import java.util.Map;
import java.util.SortedSet;
import java.util.StringTokenizer;
import java.util.TimeZone;
import java.util.TreeSet;

import org.apache.log4j.Logger;

/**
 * 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">&nbsp;</th>
 * <th align="left">Allowed Values</th>
 * <th align="left">&nbsp;</th>
 * <th align="left">Allowed Special Characters</th>
 * </tr>
 * <tr>
 * <td align="left"><code>Seconds</code></td>
 * <td align="left">&nbsp;</th>
 * <td align="left"><code>0-59</code></td>
 * <td align="left">&nbsp;</th>
 * <td align="left"><code>, - * /</code></td>
 * </tr>
 * <tr>
 * <td align="left"><code>Minutes</code></td>
 * <td align="left">&nbsp;</th>
 * <td align="left"><code>0-59</code></td>
 * <td align="left">&nbsp;</th>
 * <td align="left"><code>, - * /</code></td>
 * </tr>
 * <tr>
 * <td align="left"><code>Hours</code></td>
 * <td align="left">&nbsp;</th>
 * <td align="left"><code>0-23</code></td>
 * <td align="left">&nbsp;</th>
 * <td align="left"><code>, - * /</code></td>
 * </tr>
 * <tr>
 * <td align="left"><code>Day-of-month</code></td>
 * <td align="left">&nbsp;</th>
 * <td align="left"><code>1-31</code></td>
 * <td align="left">&nbsp;</th>
 * <td align="left"><code>, - * ? / L W</code></td>
 * </tr>
 * <tr>
 * <td align="left"><code>Month</code></td>
 * <td align="left">&nbsp;</th>
 * <td align="left"><code>1-12 or JAN-DEC</code></td>
 * <td align="left">&nbsp;</th>
 * <td align="left"><code>, - * /</code></td>
 * </tr>
 * <tr>
 * <td align="left"><code>Day-of-Week</code></td>
 * <td align="left">&nbsp;</th>
 * <td align="left"><code>1-7 or SUN-SAT</code></td>
 * <td align="left">&nbsp;</th>
 * <td align="left"><code>, - * ? / L #</code></td>
 * </tr>
 * <tr>
 * <td align="left"><code>Year (Optional)</code></td>
 * <td align="left">&nbsp;</th>
 * <td align="left"><code>empty, 1970-2199</code></td>
 * <td align="left">&nbsp;</th>
 * <td align="left"><code>, - * /</code></td>
 * </tr>
 * </table>
 * <P>
 * The '*' character is used to specify all values. For example, &quot;*&quot; 
 * in the minute field means &quot;every minute&quot;.
 * <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 &quot;10-12&quot; in
 * the hour field means &quot;the hours 10, 11 and 12&quot;.
 * <P>
 * The ',' character is used to specify additional values. For example
 * &quot;MON,WED,FRI&quot; in the day-of-week field means &quot;the days Monday,
 * Wednesday, and Friday&quot;.
 * <P>
 * The '/' character is used to specify increments. For example &quot;0/15&quot;
 * in the seconds field means &quot;the seconds 0, 15, 30, and 45&quot;. And 
 * &quot;5/15&quot; in the seconds field means &quot;the seconds 5, 20, 35, and
 * 50&quot;.  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 1 to 12. The &quot;/&quot; character simply helps you turn
 * on every &quot;nth&quot; value in the given set. Thus &quot;7/6&quot; in the
 * month field only turns on month &quot;7&quot;, 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 &quot;last&quot;, but it has different 
 * meaning in each of the two fields. For example, the value &quot;L&quot; in 
 * the day-of-month field means &quot;the last day of the month&quot; - 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 &quot;7&quot; or 
 * &quot;SAT&quot;. But if used in the day-of-week field after another value, it
 * means &quot;the last xxx day of the month&quot; - for example &quot;6L&quot;
 * means &quot;the last friday of the month&quot;. When using the 'L' option, it
 * is important not to specify lists, or ranges of values, as you'll get 
 * confusing results.
 * <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 &quot;15W&quot; as the value for the 
 * day-of-month field, the meaning is: &quot;the nearest weekday to the 15th of
 * the month&quot;. 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 &quot;1W&quot; 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 &quot;last weekday of the 
 * month&quot;.
 * <P>
 * The '#' character is allowed for the day-of-week field. This character is
 * used to specify &quot;the nth&quot; XXX day of the month. For example, the 
 * value of &quot;6#3&quot; in the day-of-week field means the third Friday of 
 * the month (day 6 = Friday and &quot;#3&quot; = the 3rd one in the month). 
 * Other examples: &quot;2#1&quot; = the first Monday of the month and 
 * &quot;4#5&quot; = the fifth Wednesday of the month. Note that if you specify
 * &quot;#5&quot; 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 (&quot;3#1,6#3&quot; 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 both a day-of-week and a day-of-month value is
 * not complete (you'll need to use the '?' character in one of these fields).
 * </li>
 * <li>Overflowing ranges is supported - that is, having a larger number on 
 * the left hand side than the right. You might do 22-2 to catch 10 o'clock 
 * at night until 2 o'clock in the morning, or you might have NOV-FEB. It is 
 * very important to note that overuse of overflowing ranges creates ranges 
 * that don't make sense and no effort has been made to determine which 
 * interpretation CronExpression chooses. An example would be 
 * "0 0 14-6 ? * FRI-MON". </li>
 * </ul>
 * </p>
 * 
 * 
 * @author Sharada Jambula, James House
 * @author Contributions from Mads Henderson
 * @author Refactoring from CronTrigger to CronExpression by Aaron Craven
 */
public class CronExpression implements Serializable, Cloneable {

	private static final long serialVersionUID = 12423409423L;
	private static Logger logger = Logger.getLogger(CronExpression.class);

	/**
	 * <p>
	 * Instructs the <code>{@link Scheduler}</code> that upon a mis-fire
	 * situation, the <code>{@link CronTrigger}</code> wants to have it's
	 * next-fire-time updated to the next time in the schedule after the
	 * current time (taking into account any associated <code>{@link Calendar}</code>,
	 * but it does not want to be fired now.
	 * </p>
	 */
	public static final int MISFIRE_INSTRUCTION_DO_NOTHING = 2;

	protected static final int YEAR_TO_GIVEUP_SCHEDULING_AT = 2299;

	protected static final int SECOND = 0;
	protected static final int MINUTE = 1;
	protected static final int HOUR = 2;
	protected static final int DAY_OF_MONTH = 3;
	protected static final int MONTH = 4;
	protected static final int DAY_OF_WEEK = 5;
	protected static final int YEAR = 6;
	protected static final int ALL_SPEC_INT = 99; // '*'
	protected static final int NO_SPEC_INT = 98; // '?'
	protected static final Integer ALL_SPEC = Integer.valueOf(ALL_SPEC_INT);
	protected static final Integer NO_SPEC = Integer.valueOf(NO_SPEC_INT);

	protected static final Map monthMap = new HashMap(20);
	protected static final Map dayMap = new HashMap(60);
	static {
		monthMap.put("JAN", Integer.valueOf(0));
		monthMap.put("FEB", Integer.valueOf(1));
		monthMap.put("MAR", Integer.valueOf(2));
		monthMap.put("APR", Integer.valueOf(3));
		monthMap.put("MAY", Integer.valueOf(4));
		monthMap.put("JUN", Integer.valueOf(5));
		monthMap.put("JUL", Integer.valueOf(6));
		monthMap.put("AUG", Integer.valueOf(7));
		monthMap.put("SEP", Integer.valueOf(8));
		monthMap.put("OCT", Integer.valueOf(9));
		monthMap.put("NOV", Integer.valueOf(10));
		monthMap.put("DEC", Integer.valueOf(11));

		dayMap.put("SUN", Integer.valueOf(1));
		dayMap.put("MON", Integer.valueOf(2));
		dayMap.put("TUE", Integer.valueOf(3));
		dayMap.put("WED", Integer.valueOf(4));
		dayMap.put("THU", Integer.valueOf(5));
		dayMap.put("FRI", Integer.valueOf(6));
		dayMap.put("SAT", Integer.valueOf(7));
	}

	private String cronExpression = null;
	private TimeZone timeZone = null;
	protected transient TreeSet seconds;
	protected transient TreeSet minutes;
	protected transient TreeSet hours;
	protected transient TreeSet daysOfMonth;
	protected transient TreeSet months;
	protected transient TreeSet daysOfWeek;
	protected transient TreeSet years;

	protected transient boolean lastdayOfWeek = false;
	protected transient int nthdayOfWeek = 0;
	protected transient boolean lastdayOfMonth = false;
	protected transient boolean nearestWeekday = false;
	protected transient boolean expressionParsed = false;

	/**
	 * Constructs a new <CODE>CronExpression</CODE> based on the specified 
	 * parameter.
	 * 
	 * @param cronExpression String representation of the cron expression the
	 *                       new object should represent
	 * @throws java.text.ParseException
	 *         if the string expression cannot be parsed into a valid 
	 *         <CODE>CronExpression</CODE>
	 */
	public CronExpression(String cronExpression) throws ParseException {
		if (cronExpression == null) {
			throw new IllegalArgumentException("cronExpression cannot be null");
		}

		this.cronExpression = cronExpression.toUpperCase(Locale.US);

		buildExpression(this.cronExpression);
	}

	/**
	 * Indicates whether the given date satisfies the cron expression. Note that
	 * milliseconds are ignored, so two Dates falling on different milliseconds
	 * of the same second will always have the same result here.
	 * 
	 * @param date the date to evaluate
	 * @return a boolean indicating whether the given date satisfies the cron
	 *         expression
	 */
	public boolean isSatisfiedBy(Date date) {
		Calendar testDateCal = Calendar.getInstance(getTimeZone());
		testDateCal.setTime(date);
		testDateCal.set(Calendar.MILLISECOND, 0);
		Date originalDate = testDateCal.getTime();

		testDateCal.add(Calendar.SECOND, -1);

		Date timeAfter = getTimeAfter(testDateCal.getTime());

		return ((timeAfter != null) && (timeAfter.equals(originalDate)));
	}

	/**
	 * Returns the next date/time <I>after</I> the given date/time which
	 * satisfies the cron expression.
	 * 
	 * @param date the date/time at which to begin the search for the next valid
	 *             date/time
	 * @return the next valid date/time
	 */
	public Date getNextValidTimeAfter(Date date) {
		return getTimeAfter(date);
	}

	/**
	 * Returns the next date/time <I>after</I> the given date/time which does
	 * <I>not</I> satisfy the expression
	 * 
	 * @param date the date/time at which to begin the search for the next 
	 *             invalid date/time
	 * @return the next valid date/time
	 */
	public Date getNextInvalidTimeAfter(Date date) {
		long difference = 1000;

		// move back to the nearest second so differences will be accurate
		Calendar adjustCal = Calendar.getInstance(getTimeZone());
		adjustCal.setTime(date);
		adjustCal.set(Calendar.MILLISECOND, 0);
		Date lastDate = adjustCal.getTime();

		Date newDate = null;

		// 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.

		// keep getting the next included time until it's farther than one
		// second
		// apart. At that point, lastDate is the last valid fire time. We return
		// the second immediately following it.
		while (difference == 1000) {
			newDate = getTimeAfter(lastDate);

			difference = newDate.getTime() - lastDate.getTime();

			if (difference == 1000) {
				lastDate = newDate;
			}
		}

		return new Date(lastDate.getTime() + 1000);
	}

	/**
	 * Returns the time zone for which this <code>CronExpression</code> 
	 * will be resolved.
	 */
	public TimeZone getTimeZone() {
		if (timeZone == null) {
			timeZone = TimeZone.getDefault();
		}

		return timeZone;
	}

	/**
	 * Sets the time zone for which  this <code>CronExpression</code> 
	 * will be resolved.
	 */
	public void setTimeZone(TimeZone timeZone) {
		this.timeZone = timeZone;
	}

	/**
	 * Returns the string representation of the <CODE>CronExpression</CODE>
	 * 
	 * @return a string representation of the <CODE>CronExpression</CODE>
	 */
	public String toString() {
		return cronExpression;
	}

	/**
	 * Indicates whether the specified cron expression can be parsed into a 
	 * valid cron expression
	 * 
	 * @param cronExpression the expression to evaluate
	 * @return a boolean indicating whether the given expression is a valid cron
	 *         expression
	 */
	public static boolean isValidExpression(String cronExpression) {

		try {
			new CronExpression(cronExpression);
		} catch (ParseException pe) {
			return false;
		}

		return true;
	}

	// //////////////////////////////////////////////////////////////////////////
	//
	// Expression Parsing Functions
	//
	// //////////////////////////////////////////////////////////////////////////

	protected void buildExpression(String expression) throws ParseException {
		expressionParsed = true;

		try {

			if (seconds == null) {
				seconds = new TreeSet();
			}
			if (minutes == null) {
				minutes = new TreeSet();
			}
			if (hours == null) {
				hours = new TreeSet();
			}
			if (daysOfMonth == null) {
				daysOfMonth = new TreeSet();
			}
			if (months == null) {
				months = new TreeSet();
			}
			if (daysOfWeek == null) {
				daysOfWeek = new TreeSet();
			}
			if (years == null) {
				years = new TreeSet();
			}

			int exprOn = SECOND;

			StringTokenizer exprsTok = new StringTokenizer(expression, " \t", false);

			while (exprsTok.hasMoreTokens() && exprOn <= YEAR) {
				String expr = exprsTok.nextToken().trim();

				// throw an exception if L is used with other days of the month
				if (exprOn == DAY_OF_MONTH && expr.indexOf('L') != -1 && expr.length() > 1 && expr.indexOf(',') >= 0) {
					throw new ParseException(
							"Support for specifying 'L' and 'LW' with other days of the month is not implemented", -1);
				}
				// throw an exception if L is used with other days of the week
				if (exprOn == DAY_OF_WEEK && expr.indexOf('L') != -1 && expr.length() > 1 && expr.indexOf(',') >= 0) {
					throw new ParseException(
							"Support for specifying 'L' with other days of the week is not implemented", -1);
				}

				StringTokenizer vTok = new StringTokenizer(expr, ",");
				while (vTok.hasMoreTokens()) {
					String v = vTok.nextToken();
					storeExpressionVals(0, v, exprOn);
				}

				exprOn++;
			}

			if (exprOn <= DAY_OF_WEEK) {
				throw new ParseException("Unexpected end of expression.", expression.length());
			}

			if (exprOn <= YEAR) {
				storeExpressionVals(0, "*", YEAR);
			}

			TreeSet dow = getSet(DAY_OF_WEEK);
			TreeSet dom = getSet(DAY_OF_MONTH);

			// Copying the logic from the UnsupportedOperationException below
			boolean dayOfMSpec = !dom.contains(NO_SPEC);
			boolean dayOfWSpec = !dow.contains(NO_SPEC);

			if (dayOfMSpec && !dayOfWSpec) {
				// skip
			} else if (dayOfWSpec && !dayOfMSpec) {
				// skip
			} else {
				throw new ParseException(
						"Support for specifying both a day-of-week AND a day-of-month parameter is not implemented.", 0);
			}
		} catch (ParseException pe) {
			throw pe;
		} catch (Exception e) {
			throw new ParseException("Illegal cron expression format (" + e.toString() + ")", 0);
		}
	}

	protected int storeExpressionVals(int pos, String s, int type) throws ParseException {

		int incr = 0;
		int i = skipWhiteSpace(pos, s);
		if (i >= s.length()) {
			return i;
		}
		char c = s.charAt(i);
		if ((c >= 'A') && (c <= 'Z') && (!s.equals("L")) && (!s.equals("LW"))) {
			String sub = s.substring(i, i + 3);
			int sval = -1;
			int eval = -1;
			if (type == MONTH) {
				sval = getMonthNumber(sub) + 1;
				if (sval <= 0) {
					throw new ParseException("Invalid Month value: '" + sub + "'", i);
				}
				if (s.length() > i + 3) {
					c = s.charAt(i + 3);
					if (c == '-') {
						i += 4;
						sub = s.substring(i, i + 3);
						eval = getMonthNumber(sub) + 1;
						if (eval <= 0) {
							throw new ParseException("Invalid Month value: '" + sub + "'", i);
						}
					}
				}
			} else if (type == DAY_OF_WEEK) {
				sval = getDayOfWeekNumber(sub);
				if (sval < 0) {
					throw new ParseException("Invalid Day-of-Week value: '" + sub + "'", i);
				}
				if (s.length() > i + 3) {
					c = s.charAt(i + 3);
					if (c == '-') {
						i += 4;
						sub = s.substring(i, i + 3);
						eval = getDayOfWeekNumber(sub);
						if (eval < 0) {
							throw new ParseException("Invalid Day-of-Week value: '" + sub + "'", i);
						}
					} else if (c == '#') {
						try {
							i += 4;
							nthdayOfWeek = Integer.parseInt(s.substring(i));
							if (nthdayOfWeek < 1 || nthdayOfWeek > 5) {
								throw new Exception();
							}
						} catch (Exception e) {
							throw new ParseException("A numeric value between 1 and 5 must follow the '#' option", i);
						}
					} else if (c == 'L') {
						lastdayOfWeek = true;
						i++;
					}
				}

			} else {
				throw new ParseException("Illegal characters for this position: '" + sub + "'", i);
			}
			if (eval != -1) {
				incr = 1;
			}
			addToSet(sval, eval, incr, type);
			return (i + 3);
		}

		if (c == '?') {
			i++;
			if ((i + 1) < s.length() && (s.charAt(i) != ' ' && s.charAt(i + 1) != '\t')) {
				throw new ParseException(
						"Illegal character after '?': " + s.charAt(i), i);
			}
			if (type != DAY_OF_WEEK && type != DAY_OF_MONTH) {
				throw new ParseException(
						"'?' can only be specfied for Day-of-Month or Day-of-Week.", i);
			}
			if (type == DAY_OF_WEEK && !lastdayOfMonth) {
				int val = ((Integer) daysOfMonth.last()).intValue();
				if (val == NO_SPEC_INT) {
					throw new ParseException(
							"'?' can only be specfied for Day-of-Month -OR- Day-of-Week.", i);
				}
			}

			addToSet(NO_SPEC_INT, -1, 0, type);
			return i;
		}

		if (c == '*' || c == '/') {
			if (c == '*' && (i + 1) >= s.length()) {
				addToSet(ALL_SPEC_INT, -1, incr, type);
				return i + 1;
			} else if (c == '/' && ((i + 1) >= s.length() || s.charAt(i + 1) == ' ' || s.charAt(i + 1) == '\t')) {
				throw new ParseException("'/' must be followed by an integer.", i);
			} else if (c == '*') {
				i++;
			}
			c = s.charAt(i);
			if (c == '/') { // is an increment specified?
				i++;
				if (i >= s.length()) {
					throw new ParseException("Unexpected end of string.", i);
				}

				incr = getNumericValue(s, i);

				i++;
				if (incr > 10) {
					i++;
				}
				if (incr > 59 && (type == SECOND || type == MINUTE)) {
					throw new ParseException("Increment > 60 : " + incr, i);
				} else if (incr > 23 && (type == HOUR)) {
					throw new ParseException("Increment > 24 : " + incr, i);
				} else if (incr > 31 && (type == DAY_OF_MONTH)) {
					throw new ParseException("Increment > 31 : " + incr, i);
				} else if (incr > 7 && (type == DAY_OF_WEEK)) {
					throw new ParseException("Increment > 7 : " + incr, i);
				} else if (incr > 12 && (type == MONTH)) {
					throw new ParseException("Increment > 12 : " + incr, i);
				}
			} else {
				incr = 1;
			}

			addToSet(ALL_SPEC_INT, -1, incr, type);
			return i;
		} else if (c == 'L') {
			i++;
			if (type == DAY_OF_MONTH) {
				lastdayOfMonth = true;
			}
			if (type == DAY_OF_WEEK) {
				addToSet(7, 7, 0, type);
			}
			if (type == DAY_OF_MONTH && s.length() > i) {
				c = s.charAt(i);
				if (c == 'W') {
					nearestWeekday = true;
					i++;
				}
			}
			return i;
		} else if (c >= '0' && c <= '9') {
			int val = Integer.parseInt(String.valueOf(c));
			i++;
			if (i >= s.length()) {
				addToSet(val, -1, -1, type);
			} else {
				c = s.charAt(i);
				if (c >= '0' && c <= '9') {
					ValueSet vs = getValue(val, s, i);
					val = vs.value;
					i = vs.pos;
				}
				i = checkNext(i, s, val, type);
				return i;
			}
		} else {
			throw new ParseException("Unexpected character: " + c, i);
		}

		return i;
	}

	protected int checkNext(int pos, String s, int val, int type) throws ParseException {

		int end = -1;
		int i = pos;

		if (i >= s.length()) {
			addToSet(val, end, -1, type);
			return i;
		}

		char c = s.charAt(pos);

		if (c == 'L') {
			if (type == DAY_OF_WEEK) {
				if (val < 1 || val > 7) {
					throw new ParseException("Day-of-Week values must be between 1 and 7", -1);
				}
				lastdayOfWeek = true;
			} else {
				throw new ParseException("'L' option is not valid here. (pos=" + i + ")", i);
			}
			TreeSet set = getSet(type);
			set.add(Integer.valueOf(val));
			i++;
			return i;
		}

		if (c == 'W') {
			if (type == DAY_OF_MONTH) {
				nearestWeekday = true;
			} else {
				throw new ParseException("'W' option is not valid here. (pos=" + i + ")", i);
			}
			TreeSet set = getSet(type);
			set.add(Integer.valueOf(val));
			i++;
			return i;
		}

		if (c == '#') {
			if (type != DAY_OF_WEEK) {
				throw new ParseException("'#' option is not valid here. (pos=" + i + ")", i);
			}
			i++;
			try {
				nthdayOfWeek = Integer.parseInt(s.substring(i));
				if (nthdayOfWeek < 1 || nthdayOfWeek > 5) {
					throw new Exception();
				}
			} catch (Exception e) {
				throw new ParseException("A numeric value between 1 and 5 must follow the '#' option", i);
			}

			TreeSet set = getSet(type);
			set.add(Integer.valueOf(val));
			i++;
			return i;
		}

		if (c == '-') {
			i++;
			c = s.charAt(i);
			int v = Integer.parseInt(String.valueOf(c));
			end = v;
			i++;
			if (i >= s.length()) {
				addToSet(val, end, 1, type);
				return i;
			}
			c = s.charAt(i);
			if (c >= '0' && c <= '9') {
				ValueSet vs = getValue(v, s, i);
				int v1 = vs.value;
				end = v1;
				i = vs.pos;
			}
			if (i < s.length() && ((c = s.charAt(i)) == '/')) {
				i++;
				c = s.charAt(i);
				int v2 = Integer.parseInt(String.valueOf(c));
				i++;
				if (i >= s.length()) {
					addToSet(val, end, v2, type);
					return i;
				}
				c = s.charAt(i);
				if (c >= '0' && c <= '9') {
					ValueSet vs = getValue(v2, s, i);
					int v3 = vs.value;
					addToSet(val, end, v3, type);
					i = vs.pos;
					return i;
				} else {
					addToSet(val, end, v2, type);
					return i;
				}
			} else {
				addToSet(val, end, 1, type);
				return i;
			}
		}

		if (c == '/') {
			i++;
			c = s.charAt(i);
			int v2 = Integer.parseInt(String.valueOf(c));
			i++;
			if (i >= s.length()) {
				addToSet(val, end, v2, type);
				return i;
			}
			c = s.charAt(i);
			if (c >= '0' && c <= '9') {
				ValueSet vs = getValue(v2, s, i);
				int v3 = vs.value;
				addToSet(val, end, v3, type);
				i = vs.pos;
				return i;
			} else {
				throw new ParseException("Unexpected character '" + c + "' after '/'", i);
			}
		}

		addToSet(val, end, 0, type);
		i++;
		return i;
	}

	public String getCronExpression() {
		return cronExpression;
	}

	public String getExpressionSummary() {
		StringBuffer buf = new StringBuffer();

		buf.append("seconds: ");
		buf.append(getExpressionSetSummary(seconds));
		buf.append("\n");
		buf.append("minutes: ");
		buf.append(getExpressionSetSummary(minutes));
		buf.append("\n");
		buf.append("hours: ");
		buf.append(getExpressionSetSummary(hours));
		buf.append("\n");
		buf.append("daysOfMonth: ");
		buf.append(getExpressionSetSummary(daysOfMonth));
		buf.append("\n");
		buf.append("months: ");
		buf.append(getExpressionSetSummary(months));
		buf.append("\n");
		buf.append("daysOfWeek: ");
		buf.append(getExpressionSetSummary(daysOfWeek));
		buf.append("\n");
		buf.append("lastdayOfWeek: ");
		buf.append(lastdayOfWeek);
		buf.append("\n");
		buf.append("nearestWeekday: ");
		buf.append(nearestWeekday);
		buf.append("\n");
		buf.append("NthDayOfWeek: ");
		buf.append(nthdayOfWeek);
		buf.append("\n");
		buf.append("lastdayOfMonth: ");
		buf.append(lastdayOfMonth);
		buf.append("\n");
		buf.append("years: ");
		buf.append(getExpressionSetSummary(years));
		buf.append("\n");

		return buf.toString();
	}

	protected String getExpressionSetSummary(java.util.Set set) {

		if (set.contains(NO_SPEC)) {
			return "?";
		}
		if (set.contains(ALL_SPEC)) {
			return "*";
		}

		StringBuffer buf = new StringBuffer();

		Iterator itr = set.iterator();
		boolean first = true;
		while (itr.hasNext()) {
			Integer iVal = (Integer) itr.next();
			String val = iVal.toString();
			if (!first) {
				buf.append(",");
			}
			buf.append(val);
			first = false;
		}

		return buf.toString();
	}

	protected String getExpressionSetSummary(java.util.ArrayList list) {

		if (list.contains(NO_SPEC)) {
			return "?";
		}
		if (list.contains(ALL_SPEC)) {
			return "*";
		}

		StringBuffer buf = new StringBuffer();

		Iterator itr = list.iterator();
		boolean first = true;
		while (itr.hasNext()) {
			Integer iVal = (Integer) itr.next();
			String val = iVal.toString();
			if (!first) {
				buf.append(",");
			}
			buf.append(val);
			first = false;
		}

		return buf.toString();
	}

	protected int skipWhiteSpace(int i, String s) {
		for (; i < s.length() && (s.charAt(i) == ' ' || s.charAt(i) == '\t'); i++) {
			;
		}

		return i;
	}

	protected int findNextWhiteSpace(int i, String s) {
		for (; i < s.length() && (s.charAt(i) != ' ' || s.charAt(i) != '\t'); i++) {
			;
		}

		return i;
	}

	protected void addToSet(int val, int end, int incr, int type) throws ParseException {

		TreeSet set = getSet(type);

		if (type == SECOND || type == MINUTE) {
			if ((val < 0 || val > 59 || end > 59) && (val != ALL_SPEC_INT)) {
				throw new ParseException(
						"Minute and Second values must be between 0 and 59", -1);
			}
		} else if (type == HOUR) {
			if ((val < 0 || val > 23 || end > 23) && (val != ALL_SPEC_INT)) {
				throw new ParseException(
						"Hour values must be between 0 and 23", -1);
			}
		} else if (type == DAY_OF_MONTH) {
			if ((val < 1 || val > 31 || end > 31) && (val != ALL_SPEC_INT) && (val != NO_SPEC_INT)) {
				throw new ParseException(
						"Day of month values must be between 1 and 31", -1);
			}
		} else if (type == MONTH) {
			if ((val < 1 || val > 12 || end > 12) && (val != ALL_SPEC_INT)) {
				throw new ParseException(
						"Month values must be between 1 and 12", -1);
			}
		} else if (type == DAY_OF_WEEK) {
			if ((val == 0 || val > 7 || end > 7) && (val != ALL_SPEC_INT) && (val != NO_SPEC_INT)) {
				throw new ParseException(
						"Day-of-Week values must be between 1 and 7", -1);
			}
		}

		if ((incr == 0 || incr == -1) && val != ALL_SPEC_INT) {
			if (val != -1) {
				set.add(Integer.valueOf(val));
			} else {
				set.add(NO_SPEC);
			}

			return;
		}

		int startAt = val;
		int stopAt = end;

		if (val == ALL_SPEC_INT && incr <= 0) {
			incr = 1;
			set.add(ALL_SPEC); // put in a marker, but also fill values
		}

		if (type == SECOND || type == MINUTE) {
			if (stopAt == -1) {
				stopAt = 59;
			}
			if (startAt == -1 || startAt == ALL_SPEC_INT) {
				startAt = 0;
			}
		} else if (type == HOUR) {
			if (stopAt == -1) {
				stopAt = 23;
			}
			if (startAt == -1 || startAt == ALL_SPEC_INT) {
				startAt = 0;
			}
		} else if (type == DAY_OF_MONTH) {
			if (stopAt == -1) {
				stopAt = 31;
			}
			if (startAt == -1 || startAt == ALL_SPEC_INT) {
				startAt = 1;
			}
		} else if (type == MONTH) {
			if (stopAt == -1) {
				stopAt = 12;
			}
			if (startAt == -1 || startAt == ALL_SPEC_INT) {
				startAt = 1;
			}
		} else if (type == DAY_OF_WEEK) {
			if (stopAt == -1) {
				stopAt = 7;
			}
			if (startAt == -1 || startAt == ALL_SPEC_INT) {
				startAt = 1;
			}
		} else if (type == YEAR) {
			if (stopAt == -1) {
				stopAt = YEAR_TO_GIVEUP_SCHEDULING_AT;
			}
			if (startAt == -1 || startAt == ALL_SPEC_INT) {
				startAt = 1970;
			}
		}

		// if the end of the range is before the start, then we need to overflow
		// into
		// the next day, month etc. This is done by adding the maximum amount
		// for that
		// type, and using modulus max to determine the value being added.
		int max = -1;
		if (stopAt < startAt) {
			switch (type) {
			case SECOND:
				max = 60;
				break;
			case MINUTE:
				max = 60;
				break;
			case HOUR:
				max = 24;
				break;
			case MONTH:
				max = 12;
				break;
			case DAY_OF_WEEK:
				max = 7;
				break;
			case DAY_OF_MONTH:
				max = 31;
				break;
			case YEAR:
				throw new IllegalArgumentException("Start year must be less than stop year");
			default:
				throw new IllegalArgumentException("Unexpected type encountered");
			}
			stopAt += max;
		}

		for (int i = startAt; i <= stopAt; i += incr) {
			if (max == -1) {
				// ie: there's no max to overflow over
				set.add(Integer.valueOf(i));
			} else {
				// take the modulus to get the real value
				int i2 = i % max;

				// 1-indexed ranges should not include 0, and should include
				// their max
				if (i2 == 0 && (type == MONTH || type == DAY_OF_WEEK || type == DAY_OF_MONTH)) {
					i2 = max;
				}

				set.add(Integer.valueOf(i2));
			}
		}
	}

	protected TreeSet getSet(int type) {
		switch (type) {
		case SECOND:
			return seconds;
		case MINUTE:
			return minutes;
		case HOUR:
			return hours;
		case DAY_OF_MONTH:
			return daysOfMonth;
		case MONTH:
			return months;
		case DAY_OF_WEEK:
			return daysOfWeek;
		case YEAR:
			return years;
		default:
			return null;
		}
	}

	protected ValueSet getValue(int v, String s, int i) {
		char c = s.charAt(i);
		String s1 = String.valueOf(v);
		while (c >= '0' && c <= '9') {
			s1 += c;
			i++;
			if (i >= s.length()) {
				break;
			}
			c = s.charAt(i);
		}
		ValueSet val = new ValueSet();

		val.pos = (i < s.length()) ? i : i + 1;
		val.value = Integer.parseInt(s1);
		return val;
	}

	protected int getNumericValue(String s, int i) {
		int endOfVal = findNextWhiteSpace(i, s);
		String val = s.substring(i, endOfVal);
		return Integer.parseInt(val);
	}

	protected int getMonthNumber(String s) {
		Integer integer = (Integer) monthMap.get(s);

		if (integer == null) {
			return -1;
		}

		return integer.intValue();
	}

	protected int getDayOfWeekNumber(String s) {
		Integer integer = (Integer) dayMap.get(s);

		if (integer == null) {
			return -1;
		}

		return integer.intValue();
	}

	// //////////////////////////////////////////////////////////////////////////
	//
	// Computation Functions
	//
	// //////////////////////////////////////////////////////////////////////////

	protected Date getTimeAfter(Date afterTime) {

		// Computation is based on Gregorian year only.
		Calendar cl = new java.util.GregorianCalendar(getTimeZone());

		// move ahead one second, since we're computing the time *after* the
		// given time
		afterTime = new Date(afterTime.getTime() + 1000);
		// CronTrigger does not deal with milliseconds
		cl.setTime(afterTime);
		cl.set(Calendar.MILLISECOND, 0);

		boolean gotOne = false;
		// loop until we've computed the next time, or we've past the endTime
		while (!gotOne) {

			if (cl.get(Calendar.YEAR) > 2999) { // prevent endless loop...
				return null;
			}

			SortedSet st = null;
			int t = 0;

			int sec = cl.get(Calendar.SECOND);
			int min = cl.get(Calendar.MINUTE);

			// get second.................................................
			st = seconds.tailSet(Integer.valueOf(sec));
			if (st != null && st.size() != 0) {
				sec = ((Integer) st.first()).intValue();
			} else {
				sec = ((Integer) seconds.first()).intValue();
				min++;
				cl.set(Calendar.MINUTE, min);
			}
			cl.set(Calendar.SECOND, sec);

			min = cl.get(Calendar.MINUTE);
			int hr = cl.get(Calendar.HOUR_OF_DAY);
			t = -1;

			// get minute.................................................
			st = minutes.tailSet(Integer.valueOf(min));
			if (st != null && st.size() != 0) {
				t = min;
				min = ((Integer) st.first()).intValue();
			} else {
				min = ((Integer) minutes.first()).intValue();
				hr++;
			}
			if (min != t) {
				cl.set(Calendar.SECOND, 0);
				cl.set(Calendar.MINUTE, min);
				setCalendarHour(cl, hr);
				continue;
			}
			cl.set(Calendar.MINUTE, min);

			hr = cl.get(Calendar.HOUR_OF_DAY);
			int day = cl.get(Calendar.DAY_OF_MONTH);
			t = -1;

			// get hour...................................................
			st = hours.tailSet(Integer.valueOf(hr));
			if (st != null && st.size() != 0) {
				t = hr;
				hr = ((Integer) st.first()).intValue();
			} else {
				hr = ((Integer) hours.first()).intValue();
				day++;
			}
			if (hr != t) {
				cl.set(Calendar.SECOND, 0);
				cl.set(Calendar.MINUTE, 0);
				cl.set(Calendar.DAY_OF_MONTH, day);
				setCalendarHour(cl, hr);
				continue;
			}
			cl.set(Calendar.HOUR_OF_DAY, hr);

			day = cl.get(Calendar.DAY_OF_MONTH);
			int mon = cl.get(Calendar.MONTH) + 1;
			// '+ 1' because calendar is 0-based for this field, and we are
			// 1-based
			t = -1;
			int tmon = mon;

			// get day...................................................
			boolean dayOfMSpec = !daysOfMonth.contains(NO_SPEC);
			boolean dayOfWSpec = !daysOfWeek.contains(NO_SPEC);
			if (dayOfMSpec && !dayOfWSpec) { // get day by day of month rule
				st = daysOfMonth.tailSet(Integer.valueOf(day));
				if (lastdayOfMonth) {
					if (!nearestWeekday) {
						t = day;
						day = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
					} else {
						t = day;
						day = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));

						java.util.Calendar tcal = java.util.Calendar.getInstance(getTimeZone());
						tcal.set(Calendar.SECOND, 0);
						tcal.set(Calendar.MINUTE, 0);
						tcal.set(Calendar.HOUR_OF_DAY, 0);
						tcal.set(Calendar.DAY_OF_MONTH, day);
						tcal.set(Calendar.MONTH, mon - 1);
						tcal.set(Calendar.YEAR, cl.get(Calendar.YEAR));

						int ldom = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
						int dow = tcal.get(Calendar.DAY_OF_WEEK);

						if (dow == Calendar.SATURDAY && day == 1) {
							day += 2;
						} else if (dow == Calendar.SATURDAY) {
							day -= 1;
						} else if (dow == Calendar.SUNDAY && day == ldom) {
							day -= 2;
						} else if (dow == Calendar.SUNDAY) {
							day += 1;
						}

						tcal.set(Calendar.SECOND, sec);
						tcal.set(Calendar.MINUTE, min);
						tcal.set(Calendar.HOUR_OF_DAY, hr);
						tcal.set(Calendar.DAY_OF_MONTH, day);
						tcal.set(Calendar.MONTH, mon - 1);
						Date nTime = tcal.getTime();
						if (nTime.before(afterTime)) {
							day = 1;
							mon++;
						}
					}
				} else if (nearestWeekday) {
					t = day;
					day = ((Integer) daysOfMonth.first()).intValue();

					java.util.Calendar tcal = java.util.Calendar.getInstance(getTimeZone());
					tcal.set(Calendar.SECOND, 0);
					tcal.set(Calendar.MINUTE, 0);
					tcal.set(Calendar.HOUR_OF_DAY, 0);
					tcal.set(Calendar.DAY_OF_MONTH, day);
					tcal.set(Calendar.MONTH, mon - 1);
					tcal.set(Calendar.YEAR, cl.get(Calendar.YEAR));

					int ldom = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
					int dow = tcal.get(Calendar.DAY_OF_WEEK);

					if (dow == Calendar.SATURDAY && day == 1) {
						day += 2;
					} else if (dow == Calendar.SATURDAY) {
						day -= 1;
					} else if (dow == Calendar.SUNDAY && day == ldom) {
						day -= 2;
					} else if (dow == Calendar.SUNDAY) {
						day += 1;
					}

					tcal.set(Calendar.SECOND, sec);
					tcal.set(Calendar.MINUTE, min);
					tcal.set(Calendar.HOUR_OF_DAY, hr);
					tcal.set(Calendar.DAY_OF_MONTH, day);
					tcal.set(Calendar.MONTH, mon - 1);
					Date nTime = tcal.getTime();
					if (nTime.before(afterTime)) {
						day = ((Integer) daysOfMonth.first()).intValue();
						mon++;
					}
				} else if (st != null && st.size() != 0) {
					t = day;
					day = ((Integer) st.first()).intValue();
					// make sure we don't over-run a short month, such as
					// february
					int lastDay = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
					if (day > lastDay) {
						day = ((Integer) daysOfMonth.first()).intValue();
						mon++;
					}
				} else {
					day = ((Integer) daysOfMonth.first()).intValue();
					mon++;
				}

				if (day != t || mon != tmon) {
					cl.set(Calendar.SECOND, 0);
					cl.set(Calendar.MINUTE, 0);
					cl.set(Calendar.HOUR_OF_DAY, 0);
					cl.set(Calendar.DAY_OF_MONTH, day);
					cl.set(Calendar.MONTH, mon - 1);
					// '- 1' because calendar is 0-based for this field, and we
					// are 1-based
					continue;
				}
			} else if (dayOfWSpec && !dayOfMSpec) { // get day by day of week
													// rule
				if (lastdayOfWeek) { // are we looking for the last XXX day of
					// the month?
					int dow = ((Integer) daysOfWeek.first()).intValue(); // desired
					// d-o-w
					int cDow = cl.get(Calendar.DAY_OF_WEEK); // current d-o-w
					int daysToAdd = 0;
					if (cDow < dow) {
						daysToAdd = dow - cDow;
					}
					if (cDow > dow) {
						daysToAdd = dow + (7 - cDow);
					}

					int lDay = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));

					if (day + daysToAdd > lDay) { // did we already miss the
						// last one?
						cl.set(Calendar.SECOND, 0);
						cl.set(Calendar.MINUTE, 0);
						cl.set(Calendar.HOUR_OF_DAY, 0);
						cl.set(Calendar.DAY_OF_MONTH, 1);
						cl.set(Calendar.MONTH, mon);
						// no '- 1' here because we are promoting the month
						continue;
					}

					// find date of last occurance of this day in this month...
					while ((day + daysToAdd + 7) <= lDay) {
						daysToAdd += 7;
					}

					day += daysToAdd;

					if (daysToAdd > 0) {
						cl.set(Calendar.SECOND, 0);
						cl.set(Calendar.MINUTE, 0);
						cl.set(Calendar.HOUR_OF_DAY, 0);
						cl.set(Calendar.DAY_OF_MONTH, day);
						cl.set(Calendar.MONTH, mon - 1);
						// '- 1' here because we are not promoting the month
						continue;
					}

				} else if (nthdayOfWeek != 0) {
					// are we looking for the Nth XXX day in the month?
					int dow = ((Integer) daysOfWeek.first()).intValue(); // desired
					// d-o-w
					int cDow = cl.get(Calendar.DAY_OF_WEEK); // current d-o-w
					int daysToAdd = 0;
					if (cDow < dow) {
						daysToAdd = dow - cDow;
					} else if (cDow > dow) {
						daysToAdd = dow + (7 - cDow);
					}

					boolean dayShifted = false;
					if (daysToAdd > 0) {
						dayShifted = true;
					}

					day += daysToAdd;
					int weekOfMonth = day / 7;
					if (day % 7 > 0) {
						weekOfMonth++;
					}

					daysToAdd = (nthdayOfWeek - weekOfMonth) * 7;
					day += daysToAdd;
					if (daysToAdd < 0 || day > getLastDayOfMonth(mon, cl.get(Calendar.YEAR))) {
						cl.set(Calendar.SECOND, 0);
						cl.set(Calendar.MINUTE, 0);
						cl.set(Calendar.HOUR_OF_DAY, 0);
						cl.set(Calendar.DAY_OF_MONTH, 1);
						cl.set(Calendar.MONTH, mon);
						// no '- 1' here because we are promoting the month
						continue;
					} else if (daysToAdd > 0 || dayShifted) {
						cl.set(Calendar.SECOND, 0);
						cl.set(Calendar.MINUTE, 0);
						cl.set(Calendar.HOUR_OF_DAY, 0);
						cl.set(Calendar.DAY_OF_MONTH, day);
						cl.set(Calendar.MONTH, mon - 1);
						// '- 1' here because we are NOT promoting the month
						continue;
					}
				} else {
					int cDow = cl.get(Calendar.DAY_OF_WEEK); // current d-o-w
					int dow = ((Integer) daysOfWeek.first()).intValue(); // desired
					// d-o-w
					st = daysOfWeek.tailSet(Integer.valueOf(cDow));
					if (st != null && st.size() > 0) {
						dow = ((Integer) st.first()).intValue();
					}

					int daysToAdd = 0;
					if (cDow < dow) {
						daysToAdd = dow - cDow;
					}
					if (cDow > dow) {
						daysToAdd = dow + (7 - cDow);
					}

					int lDay = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));

					if (day + daysToAdd > lDay) { // will we pass the end of
						// the month?
						cl.set(Calendar.SECOND, 0);
						cl.set(Calendar.MINUTE, 0);
						cl.set(Calendar.HOUR_OF_DAY, 0);
						cl.set(Calendar.DAY_OF_MONTH, 1);
						cl.set(Calendar.MONTH, mon);
						// no '- 1' here because we are promoting the month
						continue;
					} else if (daysToAdd > 0) { // are we swithing days?
						cl.set(Calendar.SECOND, 0);
						cl.set(Calendar.MINUTE, 0);
						cl.set(Calendar.HOUR_OF_DAY, 0);
						cl.set(Calendar.DAY_OF_MONTH, day + daysToAdd);
						cl.set(Calendar.MONTH, mon - 1);
						// '- 1' because calendar is 0-based for this field,
						// and we are 1-based
						continue;
					}
				}
			} else { // dayOfWSpec && !dayOfMSpec
				throw new UnsupportedOperationException(
						"Support for specifying both a day-of-week AND a day-of-month parameter is not implemented.");
				// TODO:
			}
			cl.set(Calendar.DAY_OF_MONTH, day);

			mon = cl.get(Calendar.MONTH) + 1;
			// '+ 1' because calendar is 0-based for this field, and we are
			// 1-based
			int year = cl.get(Calendar.YEAR);
			t = -1;

			// test for expressions that never generate a valid fire date,
			// but keep looping...
			if (year > YEAR_TO_GIVEUP_SCHEDULING_AT) {
				return null;
			}

			// get month...................................................
			st = months.tailSet(Integer.valueOf(mon));
			if (st != null && st.size() != 0) {
				t = mon;
				mon = ((Integer) st.first()).intValue();
			} else {
				mon = ((Integer) months.first()).intValue();
				year++;
			}
			if (mon != t) {
				cl.set(Calendar.SECOND, 0);
				cl.set(Calendar.MINUTE, 0);
				cl.set(Calendar.HOUR_OF_DAY, 0);
				cl.set(Calendar.DAY_OF_MONTH, 1);
				cl.set(Calendar.MONTH, mon - 1);
				// '- 1' because calendar is 0-based for this field, and we are
				// 1-based
				cl.set(Calendar.YEAR, year);
				continue;
			}
			cl.set(Calendar.MONTH, mon - 1);
			// '- 1' because calendar is 0-based for this field, and we are
			// 1-based

			year = cl.get(Calendar.YEAR);
			t = -1;

			// get year...................................................
			st = years.tailSet(Integer.valueOf(year));
			if (st != null && st.size() != 0) {
				t = year;
				year = ((Integer) st.first()).intValue();
			} else {
				return null; // ran out of years...
			}

			if (year != t) {
				cl.set(Calendar.SECOND, 0);
				cl.set(Calendar.MINUTE, 0);
				cl.set(Calendar.HOUR_OF_DAY, 0);
				cl.set(Calendar.DAY_OF_MONTH, 1);
				cl.set(Calendar.MONTH, 0);
				// '- 1' because calendar is 0-based for this field, and we are
				// 1-based
				cl.set(Calendar.YEAR, year);
				continue;
			}
			cl.set(Calendar.YEAR, year);

			gotOne = true;
		} 

		return cl.getTime();
	}

	/**
	 * Advance the calendar to the particular hour paying particular attention
	 * to daylight saving problems.
	 * 
	 * @param cal
	 * @param hour
	 */
	protected void setCalendarHour(Calendar cal, int hour) {
		cal.set(java.util.Calendar.HOUR_OF_DAY, hour);
		if (cal.get(java.util.Calendar.HOUR_OF_DAY) != hour && hour != 24) {
			cal.set(java.util.Calendar.HOUR_OF_DAY, hour + 1);
		}
	}

	/**
	 * NOT YET IMPLEMENTED: Returns the time before the given time
	 * that the <code>CronExpression</code> matches.
	 */
	protected Date getTimeBefore(Date endTime) {
		// TODO: implement QUARTZ-423
		return null;
	}

	/**
	 * NOT YET IMPLEMENTED: Returns the final time that the 
	 * <code>CronExpression</code> will match.
	 */
	public Date getFinalFireTime() {
		// TODO: implement QUARTZ-423
		return null;
	}

	protected boolean isLeapYear(int year) {
		return ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0));
	}

	protected int getLastDayOfMonth(int monthNum, int year) {

		switch (monthNum) {
		case 1:
			return 31;
		case 2:
			return (isLeapYear(year)) ? 29 : 28;
		case 3:
			return 31;
		case 4:
			return 30;
		case 5:
			return 31;
		case 6:
			return 30;
		case 7:
			return 31;
		case 8:
			return 31;
		case 9:
			return 30;
		case 10:
			return 31;
		case 11:
			return 30;
		case 12:
			return 31;
		default:
			throw new IllegalArgumentException("Illegal month number: " + monthNum);
		}
	}

	private void readObject(java.io.ObjectInputStream stream) throws java.io.IOException, ClassNotFoundException {

		stream.defaultReadObject();
		try {
			buildExpression(cronExpression);
		} catch (Exception ignore) {
			logger.error(ignore.getMessage());
		} 
	}

	public Object clone() {
		CronExpression copy = null;
		try {
			copy = new CronExpression(getCronExpression());
			if (getTimeZone() != null) {
				copy.setTimeZone((TimeZone) getTimeZone().clone());
			}
		} catch (ParseException ex) { // never happens since the source is
										// valid...
			throw new IncompatibleClassChangeError("Not Cloneable.");
		}
		return copy;
	}

	public String getSeconds() {
		return getExpressionSetSummary(seconds);
	}

	public String getMinutes() {
		return getExpressionSetSummary(minutes);
	}

	public String getHours() {
		return getExpressionSetSummary(hours);
	}

	public String getDaysOfMonth() {
		return getExpressionSetSummary(daysOfMonth);
	}

	public String getMonths() {
		return getExpressionSetSummary(months);
	}

	public String getDaysOfWeek() {
		return getExpressionSetSummary(daysOfWeek);
	}

	public String getYears() {
		return getExpressionSetSummary(years);
	}

	public boolean isLastdayOfWeek() {
		return lastdayOfWeek;
	}

	public int getNthdayOfWeek() {
		return nthdayOfWeek;
	}

	public boolean isLastdayOfMonth() {
		return lastdayOfMonth;
	}

	public boolean isNearestWeekday() {
		return nearestWeekday;
	}

	public boolean isExpressionParsed() {
		return expressionParsed;
	}

}

class ValueSet {
	public int value;

	public int pos;
}
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