com.alibaba.cloud.scheduling.schedulerx.util.CronExpression Maven / Gradle / Ivy
/*
* Copyright 2024-2025 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.alibaba.cloud.scheduling.schedulerx.util;
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.springframework.util.Assert;
/**
* @author yaohui
*/
public final class CronExpression {
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 = ALL_SPEC_INT;
protected static final Integer NO_SPEC = NO_SPEC_INT;
protected static final Map monthMap = new HashMap<>(20);
protected static final Map dayMap = new HashMap<>(60);
static {
monthMap.put("JAN", 0);
monthMap.put("FEB", 1);
monthMap.put("MAR", 2);
monthMap.put("APR", 3);
monthMap.put("MAY", 4);
monthMap.put("JUN", 5);
monthMap.put("JUL", 6);
monthMap.put("AUG", 7);
monthMap.put("SEP", 8);
monthMap.put("OCT", 9);
monthMap.put("NOV", 10);
monthMap.put("DEC", 11);
dayMap.put("SUN", 1);
dayMap.put("MON", 2);
dayMap.put("TUE", 3);
dayMap.put("WED", 4);
dayMap.put("THU", 5);
dayMap.put("FRI", 6);
dayMap.put("SAT", 7);
}
private final String cronExpression;
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 int lastdayOffset = 0;
protected transient boolean expressionParsed = false;
/**
* MAX_YEAR.
*/
public static final int MAX_YEAR = Calendar.getInstance().get(Calendar.YEAR) + 100;
/**
* MIN_CAL.
*/
public static final Calendar MIN_CAL = Calendar.getInstance();
static {
MIN_CAL.set(1970, 0, 1);
}
/**
* MIN_DATE.
*/
public static final Date MIN_DATE = MIN_CAL.getTime();
/**
* Constructs a new CronExpression based on the specified
* parameter.
*
* @param cronExpression String representation of the cron expression the
* new object should represent
* @throws ParseException if the string expression cannot be parsed into a valid
* CronExpression
*/
public CronExpression(final 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(final Date date) {
final Calendar testDateCal = Calendar.getInstance(getTimeZone());
testDateCal.setTime(date);
testDateCal.set(Calendar.MILLISECOND, 0);
final Date originalDate = testDateCal.getTime();
testDateCal.add(Calendar.SECOND, -1);
final Date timeAfter = getTimeAfter(testDateCal.getTime());
return ((timeAfter != null) && (timeAfter.equals(originalDate)));
}
/**
* Returns the next date/time after 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(final Date date) {
return getTimeAfter(date);
}
/**
* Returns the next date/time after the given date/time which does
* not 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(final Date date) {
long difference = 1000;
//move back to the nearest second so differences will be accurate
final Calendar adjustCal = Calendar.getInstance(getTimeZone());
adjustCal.setTime(date);
adjustCal.set(Calendar.MILLISECOND, 0);
Date lastDate = adjustCal.getTime();
Date newDate;
//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.
//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 CronExpression
* will be resolved.
*
* @return the time zone.
*/
public TimeZone getTimeZone() {
if (timeZone == null) {
timeZone = TimeZone.getDefault();
}
return timeZone;
}
public void setTimeZone(final TimeZone timeZone) {
this.timeZone = timeZone;
}
@Override
public String toString() {
return cronExpression;
}
/**
* check cron expression is valid or not.
*
* @param cronExpression cron expression
* @return return{@code true}if Cron expression is valid，otherwise return{@code false}.
*/
public static boolean isValidExpression(final String cronExpression) {
try {
new CronExpression(cronExpression);
}
catch (final ParseException pe) {
return false;
}
return true;
}
public static void validateExpression(final String cronExpression) throws ParseException {
new CronExpression(cronExpression);
}
protected void buildExpression(final 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;
final StringTokenizer exprsTok = new StringTokenizer(expression, " \t",
false);
while (exprsTok.hasMoreTokens() && exprOn <= YEAR) {
final 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.contains(",")) {
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.contains(",")) {
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 implemented.", -1);
}
final StringTokenizer vTok = new StringTokenizer(expr, ",");
while (vTok.hasMoreTokens()) {
final 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);
}
final TreeSet dow = getSet(DAY_OF_WEEK);
final TreeSet dom = getSet(DAY_OF_MONTH);
// Copying the logic from the UnsupportedOperationException below
final boolean dayOfMSpec = !dom.contains(NO_SPEC);
final boolean dayOfWSpec = !dow.contains(NO_SPEC);
if (!dayOfMSpec || dayOfWSpec) {
if (!dayOfWSpec || dayOfMSpec) {
throw new ParseException(
"Support for specifying both a day-of-week AND a day-of-month parameter is not implemented.", 0);
}
}
}
catch (final ParseException pe) {
throw pe;
}
catch (final Exception e) {
throw new ParseException("Illegal cron expression format ("
+ e.toString() + ")", 0);
}
}
protected int storeExpressionVals(final int pos, final String s, final 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 && (s.charAt(i + 3) == '-')) {
i += 4;
sub = s.substring(i, i + 3);
eval = getMonthNumber(sub) + 1;
Assert.isTrue(eval > 0, "Invalid Month value: '" + sub + "'");
}
}
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);
Assert.isTrue(eval >= 0, "Invalid Day-of-Week value: '" + sub + "'");
}
else if (c == '#') {
i += 4;
nthdayOfWeek = Integer.parseInt(s.substring(i));
Assert.isTrue(nthdayOfWeek > 0 && nthdayOfWeek < 6, "A numeric value between 1 and 5 must follow the '#' option");
}
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) {
final int val = daysOfMonth.last();
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 == '-') {
final 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') {
final 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(final int pos, final String s, final int val, final 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);
}
final TreeSet set = getSet(type);
set.add(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);
}
final TreeSet set = getSet(type);
set.add(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 (final Exception e) {
throw new ParseException(
"A numeric value between 1 and 5 must follow the '#' option",
i);
}
final TreeSet set = getSet(type);
set.add(val);
i++;
return i;
}
if (c == '-') {
i++;
c = s.charAt(i);
final 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') {
final ValueSet vs = getValue(v, s, i);
end = vs.value;
i = vs.pos;
}
if (i < s.length() && (s.charAt(i) == '/')) {
i++;
c = s.charAt(i);
final 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') {
final ValueSet vs = getValue(v2, s, i);
final 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);
final 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') {
final ValueSet vs = getValue(v2, s, i);
final 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() {
final StringBuilder buf = new StringBuilder();
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(final java.util.Set set) {
if (set.contains(NO_SPEC)) {
return "?";
}
if (set.contains(ALL_SPEC)) {
return "*";
}
final StringBuilder buf = new StringBuilder();
final Iterator itr = set.iterator();
boolean first = true;
while (itr.hasNext()) {
final Integer iVal = itr.next();
final String val = iVal.toString();
if (!first) {
buf.append(",");
}
buf.append(val);
first = false;
}
return buf.toString();
}
protected String getExpressionSetSummary(final java.util.ArrayList list) {
if (list.contains(NO_SPEC)) {
return "?";
}
if (list.contains(ALL_SPEC)) {
return "*";
}
final StringBuilder buf = new StringBuilder();
final Iterator itr = list.iterator();
boolean first = true;
while (itr.hasNext()) {
final Integer iVal = itr.next();
final String val = iVal.toString();
if (!first) {
buf.append(",");
}
buf.append(val);
first = false;
}
return buf.toString();
}
protected int skipWhiteSpace(int i, final String s) {
for (; i < s.length() && (s.charAt(i) == ' ' || s.charAt(i) == '\t'); i++) {
// empty
}
return i;
}
protected int findNextWhiteSpace(int i, final String s) {
for (; i < s.length() && (s.charAt(i) != ' ' || s.charAt(i) != '\t'); i++) {
// empty
}
return i;
}
protected void addToSet(final int val, final int end, int incr, final int type)
throws ParseException {
final 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(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(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(i2);
}
}
}
TreeSet getSet(final int type) throws ParseException {
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:
throw new ParseException("Invalid type value: '" + type + "'", -1);
}
}
protected ValueSet getValue(final int v, final String s, int i) {
char c = s.charAt(i);
final 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);
}
final ValueSet val = new ValueSet();
val.pos = (i < s.length()) ? i : i + 1;
val.value = Integer.parseInt(s1.toString());
return val;
}
protected int getNumericValue(final String s, final int i) {
final int endOfVal = findNextWhiteSpace(i, s);
final String val = s.substring(i, endOfVal);
return Integer.parseInt(val);
}
protected int getMonthNumber(final String s) {
final Integer integer = monthMap.get(s);
if (integer == null) {
return -1;
}
return integer;
}
protected int getDayOfWeekNumber(final String s) {
final Integer integer = dayMap.get(s);
if (integer == null) {
return -1;
}
return integer;
}
public Date getTimeAfter(Date afterTime) {
// Computation is based on Gregorian year only.
final Calendar cl = new java.util.GregorianCalendar(getTimeZone());
// move ahead one second, since we're computing the time *after* the
// given time
if (afterTime == null) {
return null;
}
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(sec);
if (st != null && st.size() != 0) {
sec = st.first();
}
else {
sec = seconds.first();
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(min);
if (st != null && st.size() != 0) {
t = min;
min = st.first();
}
else {
min = minutes.first();
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(hr);
if (st != null && st.size() != 0) {
t = hr;
hr = st.first();
}
else {
hr = hours.first();
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...................................................
final boolean dayOfMSpec = !daysOfMonth.contains(NO_SPEC);
final boolean dayOfWSpec = !daysOfWeek.contains(NO_SPEC);
if (dayOfMSpec && !dayOfWSpec) { // get day by day of month rule
st = daysOfMonth.tailSet(day);
if (lastdayOfMonth) {
if (!nearestWeekday) {
t = day;
day = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
day -= lastdayOffset;
day = t > day ? 1 : day;
if (t > day && ++mon > 12) {
mon = 1;
tmon = 3333; // ensure test of mon != tmon further below fails
cl.add(Calendar.YEAR, 1);
}
}
else {
t = day;
day = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
day -= lastdayOffset;
final Calendar tcal = 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));
final int ldom = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
final 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);
final Date nTime = tcal.getTime();
if (nTime.before(afterTime)) {
day = 1;
mon++;
}
}
}
else if (nearestWeekday) {
t = day;
day = daysOfMonth.first();
final Calendar tcal = 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));
final int ldom = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
final 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);
final Date nTime = tcal.getTime();
if (nTime.before(afterTime)) {
day = daysOfMonth.first();
mon++;
}
}
else if (st != null && st.size() != 0) {
t = day;
day = st.first();
// make sure we don't over-run a short month, such as february
final int lastDay = getLastDayOfMonth(mon, cl.get(Calendar.YEAR));
if (day > lastDay) {
day = daysOfMonth.first();
mon++;
}
}
else {
day = daysOfMonth.first();
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?
final int dow = daysOfWeek.first(); // desired
// d-o-w
final 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);
}
final 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?
final int dow = daysOfWeek.first(); // desired
// d-o-w
final 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 {
final int cDow = cl.get(Calendar.DAY_OF_WEEK); // current d-o-w
int dow = daysOfWeek.first(); // desired
// d-o-w
st = daysOfWeek.tailSet(cDow);
if (st != null && st.size() > 0) {
dow = st.first();
}
int daysToAdd = 0;
if (cDow < dow) {
daysToAdd = dow - cDow;
}
if (cDow > dow) {
daysToAdd = dow + (7 - cDow);
}
final 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 switching 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.");
}
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(mon);
if (st != null && st.size() != 0) {
t = mon;
mon = st.first();
}
else {
mon = months.first();
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(year);
if (st != null && st.size() != 0) {
t = year;
year = st.first();
}
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 the calendar to operate on
* @param hour the hour to set
*/
protected void setCalendarHour(final Calendar cal, final int hour) {
cal.set(Calendar.HOUR_OF_DAY, hour);
if (cal.get(Calendar.HOUR_OF_DAY) != hour && hour != 24) {
cal.set(Calendar.HOUR_OF_DAY, hour + 1);
}
}
protected Date getTimeBefore(final Date targetDate) {
final Calendar cl = Calendar.getInstance(getTimeZone());
// CronTrigger does not deal with milliseconds, so truncate target
cl.setTime(targetDate);
cl.set(Calendar.MILLISECOND, 0);
final Date targetDateNoMs = cl.getTime();
// to match this
Date start = targetDateNoMs;
final long minIncrement = findMinIncrement();
Date prevFireTime;
do {
final Date prevCheckDate = new Date(start.getTime() - minIncrement);
prevFireTime = getTimeAfter(prevCheckDate);
if (prevFireTime == null || prevFireTime.before(MIN_DATE)) {
return null;
}
start = prevCheckDate;
} while (prevFireTime.compareTo(targetDateNoMs) >= 0);
return prevFireTime;
}
public Date getPrevFireTime(final Date targetDate) {
return getTimeBefore(targetDate);
}
private long findMinIncrement() {
if (seconds.size() != 1) {
return minInSet(seconds) * 1000;
}
else if (seconds.first() == ALL_SPEC_INT) {
return 1000;
}
if (minutes.size() != 1) {
return minInSet(minutes) * 60000;
}
else if (minutes.first() == ALL_SPEC_INT) {
return 60000;
}
if (hours.size() != 1) {
return minInSet(hours) * 3600000;
}
else if (hours.first() == ALL_SPEC_INT) {
return 3600000;
}
return 86400000;
}
private int minInSet(final TreeSet set) {
int previous = 0;
int min = Integer.MAX_VALUE;
boolean first = true;
for (final int value : set) {
if (first) {
previous = value;
first = false;
continue;
}
else {
final int diff = value - previous;
if (diff < min) {
min = diff;
}
}
}
return min;
}
protected boolean isLeapYear(final int year) {
return ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0));
}
protected int getLastDayOfMonth(final int monthNum, final 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 class ValueSet {
public int value;
public int pos;
}
}
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