Examples of java.util.GregorianCalendar.roll()

java.util.GregorianCalendar.roll()
Adds or subtracts (up/down) a single unit of time on the given time field without changing larger fields.
Example: Consider a GregorianCalendar originally set to December 31, 1999. Calling {@link #roll(int,boolean) roll(Calendar.MONTH, true)}sets the calendar to January 31, 1999. The YEAR field is unchanged because it is a larger field than MONTH.
@param up indicates if the value of the specified calendar field is to berolled up or rolled down. Use true if rolling up, false otherwise. @exception IllegalArgumentException if field isZONE_OFFSET, DST_OFFSET, or unknown, or if any calendar fields have out-of-range values in non-lenient mode. @see #add(int,int) @see #set(int,int)

                .get(Calendar.YEAR));
        assertEquals("Wrong month: " + cal.getTime(), Calendar.JANUARY, cal
                .get(Calendar.MONTH));
        assertEquals("Wrong date: " + cal.getTime(), 14, cal.get(Calendar.DATE));
        
        cal.roll(Calendar.WEEK_OF_YEAR, false);
        assertEquals("Wrong year: " + cal.getTime(), 1994, cal
                .get(Calendar.YEAR));
        assertEquals("Wrong month: " + cal.getTime(), Calendar.JANUARY, cal
                .get(Calendar.MONTH));
        assertEquals("Wrong date: " + cal.getTime(), 7, cal.get(Calendar.DATE));

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                .get(Calendar.YEAR));
        assertEquals("Wrong month: " + cal.getTime(), Calendar.JANUARY, cal
                .get(Calendar.MONTH));
        assertEquals("Wrong date: " + cal.getTime(), 7, cal.get(Calendar.DATE));
        
        cal.roll(Calendar.WEEK_OF_YEAR, false);
        assertEquals("Wrong year: " + cal.getTime(), 1994, cal
                .get(Calendar.YEAR));
        assertEquals("Wrong month: " + cal.getTime(), Calendar.DECEMBER, cal
                .get(Calendar.MONTH));
        assertEquals("Wrong date: " + cal.getTime(), 30, cal.get(Calendar.DATE));

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                .get(Calendar.YEAR));
        assertEquals("Wrong month: " + cal.getTime(), Calendar.DECEMBER, cal
                .get(Calendar.MONTH));
        assertEquals("Wrong date: " + cal.getTime(), 30, cal.get(Calendar.DATE));
        
        cal.roll(Calendar.WEEK_OF_YEAR, false);
        assertEquals("Wrong year: " + cal.getTime(), 1994, cal
                .get(Calendar.YEAR));
        assertEquals("Wrong month: " + cal.getTime(), Calendar.DECEMBER, cal
                .get(Calendar.MONTH));
        assertEquals("Wrong date: " + cal.getTime(), 23, cal.get(Calendar.DATE));

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                .get(Calendar.MONTH));
        assertEquals("Wrong date: " + cal.getTime(), 23, cal.get(Calendar.DATE));
        
        // Regression for HARMONY-4510
        cal.set(1999, Calendar.DECEMBER, 31, 23, 59, 59);
        cal.roll(GregorianCalendar.WEEK_OF_YEAR, true);
        assertEquals("Wrong year: " + cal.getTime(), 1999, cal
                .get(Calendar.YEAR));
        assertEquals("Wrong month: " + cal.getTime(), Calendar.JANUARY, cal
                .get(Calendar.MONTH));
        assertEquals("Wrong date: " + cal.getTime(), 8, cal.get(Calendar.DATE));

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        assertEquals("Wrong year: " + cal.getTime(), 1999, cal
                .get(Calendar.YEAR));
        assertEquals("Wrong month: " + cal.getTime(), Calendar.JANUARY, cal
                .get(Calendar.MONTH));
        assertEquals("Wrong date: " + cal.getTime(), 8, cal.get(Calendar.DATE));
        cal.roll(GregorianCalendar.WEEK_OF_YEAR, false);
        assertEquals("Wrong year: " + cal.getTime(), 1999, cal
                .get(Calendar.YEAR));
        assertEquals("Wrong month: " + cal.getTime(), Calendar.DECEMBER, cal
                .get(Calendar.MONTH));
        assertEquals("Wrong date: " + cal.getTime(), 31, cal.get(Calendar.DATE));

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        long estimatedMillis = (long) (millisPerFile * this.length) - elapsedMillis;
        //long estimatedMillis = (long) (millisPerFile * getFileNumber()) - elapsedMillis;


        GregorianCalendar estimatedCalendar = new GregorianCalendar();
        estimatedCalendar.setTimeInMillis(estimatedMillis);
        estimatedCalendar.roll(Calendar.HOUR, false);


        return estimatedCalendar;
    }


    /**

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        assertEquals(DateUtils.dayDiff(0, System.currentTimeMillis()),
            DateUtils.dayDiffFromToday(null));


        Calendar cal = new GregorianCalendar();


        cal.roll(Calendar.DAY_OF_YEAR, 1);
        Date tomorrow = cal.getTime();
        assertEquals(1, DateUtils.dayDiffFromToday(tomorrow));


        cal = new GregorianCalendar();
        cal.roll(Calendar.DAY_OF_YEAR, -2);

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        cal.roll(Calendar.DAY_OF_YEAR, 1);
        Date tomorrow = cal.getTime();
        assertEquals(1, DateUtils.dayDiffFromToday(tomorrow));


        cal = new GregorianCalendar();
        cal.roll(Calendar.DAY_OF_YEAR, -2);
        Date beforeYesterday = cal.getTime();
        assertEquals(2, DateUtils.dayDiffFromToday(beforeYesterday));
    }


    /**

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        double millisPerFile = (double) elapsedMillis / (double) currentFile;
        long estimatedMillis = (long) (millisPerFile * getFileNumber()) - elapsedMillis;


        GregorianCalendar estimatedCalendar = new GregorianCalendar();
        estimatedCalendar.setTimeInMillis(estimatedMillis);
        estimatedCalendar.roll(Calendar.HOUR, false);


        return estimatedCalendar;
    }


    /**

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                ( relativeTo.get( Calendar.DAY_OF_MONTH ) == m_dayOfMonth &&
                ( relativeTo.get( Calendar.HOUR_OF_DAY ) > hour ||
                ( relativeTo.get( Calendar.HOUR_OF_DAY ) == hour &&
                relativeTo.get( Calendar.MINUTE ) >= minute ) ) ) ) )
            {
                next.roll( Calendar.MONTH, true );
            }
        }


        //return time in millis
        return next.getTime().getTime();

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