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Added a working implementation of calendar that fills in the important

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fields (year, month, day, hour, minute, second) for the Gregorian calendar.
Specifically, it fills in YEAR, MONTH, DAY_OF_MONTH, HOUR_OF_DAY, MINUTE,
and SECOND.
This commit is contained in:
Eric Scharff 2007-10-22 12:03:15 -06:00
parent 3e84d4438a
commit 8902cf2a73
1 changed files with 46 additions and 0 deletions
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46
classpath/java/util/Calendar.java
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@ -59,11 +59,57 @@ public abstract class Calendar {
public abstract int getActualMaximum(int field);
private static class MyCalendar extends Calendar {
private static final long MILLIS_PER_DAY = 86400000;
private static final int MILLIS_PER_HOUR = 3600000;
private static final int MILLIS_PER_MINUTE = 60000;
private static final int MILLIS_PER_SECOND = 1000;
private static final int EPOCH_YEAR = 1970;
private static final int[][] DAYS_IN_MONTH = new int[][] {
{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
};
public MyCalendar(long time) {
this.time = time;
this.isTimeSet = true;
parseIntoFields(time);
}
private static boolean isLeapYear(int year) {
return (year%4 == 0) && (year%100 != 0) || (year%400 == 0);
}
private static int daysInYear(int year) {
return isLeapYear(year) ? 366 : 365;
}
private void parseIntoFields(long timeInMillis) {
long days = timeInMillis / MILLIS_PER_DAY;
int year = EPOCH_YEAR;
while (days >= daysInYear(year)) {
days -= daysInYear(year++);
}
int month=0;
int leapIndex = isLeapYear(year) ? 1 : 0;
while (days >= DAYS_IN_MONTH[leapIndex][month]) {
days -= DAYS_IN_MONTH[leapIndex][month++];
}
days++;
int remainder = (int)(timeInMillis % MILLIS_PER_DAY);
int hour = remainder / MILLIS_PER_HOUR;
remainder = remainder % MILLIS_PER_HOUR;
int minute = remainder / MILLIS_PER_MINUTE;
remainder = remainder / MILLIS_PER_MINUTE;
int second = remainder / MILLIS_PER_SECOND;
fields[YEAR] = year;
fields[MONTH] = month;
fields[DAY_OF_MONTH] = (int)days;
fields[HOUR_OF_DAY] = hour;
fields[MINUTE] = minute;
fields[SECOND] = second;
}
public void roll(int field, boolean up) {
// todo
}