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)

    gc.roll(Calendar.DAY_OF_MONTH, true);
    assertTrue("Failed to roll day_of_month up", gc
        .equals(new GregorianCalendar(1972, Calendar.OCTOBER, 14, 19,
            9, 59)));
    gc = new GregorianCalendar(1972, Calendar.OCTOBER, 31, 19, 9, 59);
    gc.roll(Calendar.DAY_OF_MONTH, true);
    assertTrue("Failed to roll day_of_month up", gc
        .equals(new GregorianCalendar(1972, Calendar.OCTOBER, 1, 19, 9,
            59)));


    GregorianCalendar cal = new GregorianCalendar();

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            59)));


    GregorianCalendar cal = new GregorianCalendar();
    int result;
    try {
      cal.roll(Calendar.ZONE_OFFSET, true);
      result = 0;
    } catch (IllegalArgumentException e) {
      result = 1;
    }
    assertEquals("ZONE_OFFSET roll", 1, result);

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    } catch (IllegalArgumentException e) {
      result = 1;
    }
    assertEquals("ZONE_OFFSET roll", 1, result);
    try {
      cal.roll(Calendar.DST_OFFSET, true);
      result = 0;
    } catch (IllegalArgumentException e) {
      result = 1;
    }
    assertEquals("ZONE_OFFSET roll", 1, result);

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      result = 1;
    }
    assertEquals("ZONE_OFFSET roll", 1, result);


    cal.set(2004, Calendar.DECEMBER, 31, 5, 0, 0);
    cal.roll(Calendar.WEEK_OF_YEAR, true);
        assertEquals("Wrong year: " + cal.getTime(), 2004, cal
                .get(Calendar.YEAR));
        assertEquals("Wrong month: " + cal.getTime(), Calendar.JANUARY, cal
                .get(Calendar.MONTH));
        assertEquals("Wrong date: " + cal.getTime(), 9, cal.get(Calendar.DATE));

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        assertEquals("Wrong date: " + cal.getTime(), 9, cal.get(Calendar.DATE));


        // Regression for HARMONY-4372
        cal.set(1994, 11, 30, 5, 0, 0);
        cal.setMinimalDaysInFirstWeek(4);
        cal.roll(Calendar.WEEK_OF_YEAR, true);
        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, true);
        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(), 14, 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(), 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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