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SPR-6273: resolved with patch - use recursive call to reset low order bits and then re-seek match for pattern

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This commit is contained in:
David Syer
2009-10-26 22:37:04 +00:00
parent 7b54746a50
commit 3c9eed1c22
2 changed files with 97 additions and 18 deletions
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56
org.springframework.context/src/main/java/org/springframework/scheduling/support/CronSequenceGenerator.java
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@@ -66,7 +66,6 @@ class CronSequenceGenerator {
private final String expression;
/**
* Construct a {@link CronSequenceGenerator} from the pattern provided.
* @param expression a space-separated list of time fields
@@ -77,7 +76,6 @@ class CronSequenceGenerator {
parse(expression);
}
/**
* Get the next {@link Date} in the sequence matching the Cron pattern and
* after the value provided. The return value will have a whole number of
@@ -86,6 +84,27 @@ class CronSequenceGenerator {
* @return the next value matching the pattern
*/
public Date next(Date date) {
/*
The plan:
1 Round up to the next whole second
2 If seconds match move on, otherwise find the next match:
2.1 If next match is in the next minute then roll forwards
3 If minute matches move on, otherwise find the next match
3.1 If next match is in the next hour then roll forwards
3.2 Reset the seconds and go to 2
4 If hour matches move on, otherwise find the next match
4.1 If next match is in the next day then roll forwards,
4.2 Reset the minutes and seconds and go to 2
...
*/
Calendar calendar = new GregorianCalendar();
calendar.setTime(date);
@@ -93,10 +112,17 @@ class CronSequenceGenerator {
calendar.add(Calendar.SECOND, 1);
calendar.set(Calendar.MILLISECOND, 0);
doNext(calendar);
return calendar.getTime();
}
private void doNext(Calendar calendar) {
List<Integer> resets = new ArrayList<Integer>();
int second = calendar.get(Calendar.SECOND);
int updateSecond = findNext(this.seconds, second, 60, calendar, Calendar.SECOND, Collections.<Integer> emptyList());
List<Integer> emptyList = Collections.<Integer> emptyList();
int updateSecond = findNext(this.seconds, second, 60, calendar, Calendar.SECOND, emptyList);
if (second == updateSecond) {
resets.add(Calendar.SECOND);
}
@@ -105,12 +131,16 @@ class CronSequenceGenerator {
int updateMinute = findNext(this.minutes, minute, 60, calendar, Calendar.MINUTE, resets);
if (minute == updateMinute) {
resets.add(Calendar.MINUTE);
} else {
doNext(calendar);
}
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int updateHour = findNext(this.hours, hour, 24, calendar, Calendar.HOUR_OF_DAY, resets);
if (hour == updateHour) {
resets.add(Calendar.HOUR_OF_DAY);
} else {
doNext(calendar);
}
int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
@@ -118,16 +148,20 @@ class CronSequenceGenerator {
int updateDayOfMonth = findNextDay(calendar, this.daysOfMonth, dayOfMonth, daysOfWeek, dayOfWeek, 366, resets);
if (dayOfMonth == updateDayOfMonth) {
resets.add(Calendar.DAY_OF_MONTH);
} else {
doNext(calendar);
}
int month = calendar.get(Calendar.MONTH);
month = findNext(this.months, month, 12, calendar, Calendar.MONTH, resets);
int updateMonth = findNext(this.months, month, 12, calendar, Calendar.MONTH, resets);
if (month != updateMonth) {
doNext(calendar);
}
return calendar.getTime();
}
private int findNextDay(Calendar calendar, BitSet daysOfMonth, int dayOfMonth, BitSet daysOfWeek,
int dayOfWeek, int max, List<Integer> resets) {
private int findNextDay(Calendar calendar, BitSet daysOfMonth, int dayOfMonth, BitSet daysOfWeek, int dayOfWeek,
int max, List<Integer> resets) {
int count = 0;
// the DAY_OF_WEEK values in java.util.Calendar start with 1 (Sunday),
@@ -180,7 +214,6 @@ class CronSequenceGenerator {
}
}
// Parsing logic invoked by the constructor.
/**
@@ -240,8 +273,7 @@ class CronSequenceGenerator {
// Not an incrementer so it must be a range (possibly empty)
int[] range = getRange(field, max);
bits.set(range[0], range[1] + 1);
}
else {
} else {
String[] split = StringUtils.delimitedListToStringArray(field, "/");
if (split.length > 2) {
throw new IllegalArgumentException("Incrementer has more than two fields: " + field);
@@ -267,8 +299,7 @@ class CronSequenceGenerator {
}
if (!field.contains("-")) {
result[0] = result[1] = Integer.valueOf(field);
}
else {
} else {
String[] split = StringUtils.delimitedListToStringArray(field, "-");
if (split.length > 2) {
throw new IllegalArgumentException("Range has more than two fields: " + field);
@@ -279,7 +310,6 @@ class CronSequenceGenerator {
return result;
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof CronSequenceGenerator)) {