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)

        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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        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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        double millisPerFile = (double) elapsedMillis / (double) this.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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  private boolean isHalfOverBorder(Measuring measuring)throws ApplicationException{  
    int counter = 0;
      int bcounter = 0;
      UnitSystem unitsystem = measuring.getPoint().getUnitSystem();
      GregorianCalendar lowerBorder = (GregorianCalendar)this.measurings.get(this.measurings.size()-1).getTime().clone();
      lowerBorder.roll(GregorianCalendar.HOUR,-1);
  
      if (this.measurings.size() > 0) {
        for (int i = this.measurings.size()-1; i >= 0; i--) {
          if ((lowerBorder.before(this.measurings.get(i).getTime()) ||
            lowerBorder.equals(this.measurings.get(i).getTime()))&&

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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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