判断给定的时间是否满足表达式

/**
* 判断给定的时间 是否 满足 crontab 表达式【忽略毫秒】
* // * * 7 * * ? *
*/
public static boolean isMatch(String crontabExpress, Date date) throws java.text.ParseException {
try {
CronExpression crontabExpression = new CronExpression(crontabExpress);
return crontabExpression.isSatisfiedBy(date);
} catch (ParseException e) {
return false;
}
}

package testService;
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;

 public class CronExpression implements Serializable, Cloneable {

private static final long serialVersionUID = 12423409423L;

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<Integer> seconds;
protected transient TreeSet<Integer> minutes;
protected transient TreeSet<Integer> hours;
protected transient TreeSet<Integer> daysOfMonth;
protected transient TreeSet<Integer> months;
protected transient TreeSet<Integer> daysOfWeek;
protected transient TreeSet<Integer> years;

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

public static final int MAX_YEAR = Calendar.getInstance().get(Calendar.YEAR) + 100;

/**
* 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);
if(newDate == null)
break;

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;
}

public static void validateExpression(String cronExpression) throws ParseException {

new CronExpression(cronExpression);
}

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

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

try {

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

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);
}
if(exprOn == DAY_OF_WEEK && expr.indexOf('#') != -1 && expr.indexOf('#', expr.indexOf('#') +1) != -1) {
throw new ParseException("Support for specifying multiple \"nth\" days is not imlemented.", -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")) && (!s.matches("^L-[0-9]*[W]?"))) {
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 == '-') {
ValueSet vs = getValue(0, s, i+1);
lastdayOffset = vs.value;
if(lastdayOffset > 30)
throw new ParseException("Offset from last day must be <= 30", i+1);
i = vs.pos;
}
if(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);
}
if(val > 31)
throw new ParseException("The 'W' option does not make sense with values larger than 31 (max number of days in a month)", 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<Integer> 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 = MAX_YEAR;
}
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<Integer> 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);
StringBuilder s1 = new StringBuilder(String.valueOf(v));
while (c >= '0' && c <= '9') {
s1.append(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.toString());
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
//
////////////////////////////////////////////////////////////////////////////

public 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 (endTime != null && cl.getTime().after(endTime)) return null;
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));
day -= lastdayOffset;
} else {
t = day;
day = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
day -= lastdayOffset;

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 occurrence 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 > MAX_YEAR) {
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;
} // while( !done )

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.
*/
public 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) {
} // never happens
}

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;
}
}

class ValueSet {
public int value;

public int pos;
}