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)

        if (request instanceof HttpServletRequest) {
            filterChain.doFilter(request, response);
            HttpServletResponse httpResponse = (HttpServletResponse) response;
            httpResponse.setHeader("Pragma", "public");
            Calendar cal = new GregorianCalendar();
            cal.roll(Calendar.SECOND, seconds);
            httpResponse.setHeader("Cache-Control", "PUBLIC, max-age=" + seconds + ", must-revalidate");
            httpResponse.setHeader("Expires", httpDateFormat.format(cal.getTime()));
        }
    }

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    String[] months = new String[12];
    SimpleDateFormat dateFmt = new SimpleDateFormat("MMM");
    boolean isComplete = false;
    for(GregorianCalendar iDate = new GregorianCalendar(1970, Calendar.JANUARY, 1); 
    !isComplete ; 
    iDate.roll(Calendar.MONTH, true)) {
      months[iDate.get(Calendar.MONTH)] = dateFmt.format(new Date(iDate.getTimeInMillis()));
      isComplete = iDate.get(Calendar.MONTH) == Calendar.DECEMBER;
    }
    _monthField = new JComboBox(months);
    add(_monthField);

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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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        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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   */
  public void test_rollII() {
    // Test for method void java.util.GregorianCalendar.roll(int, int)
    GregorianCalendar gc = new GregorianCalendar(1972, Calendar.OCTOBER, 8,
        2, 5, 0);
    gc.roll(Calendar.DAY_OF_MONTH, -1);
    assertTrue("Failed to roll DAY_OF_MONTH down by 1", gc
        .equals(new GregorianCalendar(1972, Calendar.OCTOBER, 7, 2, 5,
            0)));
    gc = new GregorianCalendar(1972, Calendar.OCTOBER, 8, 2, 5, 0);
    gc.roll(Calendar.DAY_OF_MONTH, 25);

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    gc.roll(Calendar.DAY_OF_MONTH, -1);
    assertTrue("Failed to roll DAY_OF_MONTH down by 1", gc
        .equals(new GregorianCalendar(1972, Calendar.OCTOBER, 7, 2, 5,
            0)));
    gc = new GregorianCalendar(1972, Calendar.OCTOBER, 8, 2, 5, 0);
    gc.roll(Calendar.DAY_OF_MONTH, 25);
    assertTrue("Failed to roll DAY_OF_MONTH up by 25", gc
        .equals(new GregorianCalendar(1972, Calendar.OCTOBER, 2, 2, 5,
            0)));
    gc = new GregorianCalendar(1972, Calendar.OCTOBER, 8, 2, 5, 0);
    gc.roll(Calendar.DAY_OF_MONTH, -10);

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