TimeSeriesStatistics(TimeSeries timeSeries) {
  Date lastDate = null;
  name = (String) timeSeries.getKey();
  for (int i = 0; i < timeSeries.getItemCount(); i++) {
    TimeSeriesDataItem dataItem = timeSeries.getDataItem(i);
    Date currDate = dataItem.getPeriod().getStart();
    double value = dataItem.getValue().doubleValue();
    if (lastDate == null) {
      lastDate = currDate;
    } else {
      long interval = currDate.getTime() - lastDate.getTime();
      lastDate = currDate;
      meanInterval = (meanInterval * size + interval) / (size + 1);
      maxInterval = maxInterval < interval ? interval : maxInterval;
      minInterval = minInterval < interval ? minInterval : interval;
    }
    meanVal = (meanVal * size + value) / (size + 1);
    maxVal = maxVal < value ? value : maxVal;
    minVal = minVal < value ? minVal : value;
    valSum += value;
    size ++;
  }
}
 

@Test
public void testAddPointToSeries()
{
    TimeSeriesHolder timeSeriesHolder = new TimeSeriesHolder();

    SeriesDefinition seriesDefinition = mock(SeriesDefinition.class);
    when(seriesDefinition.getSeriesLegend()).thenReturn(SERIES_LEGEND);

    timeSeriesHolder.beginSeries(seriesDefinition);

    timeSeriesHolder.addDataPointToSeries(seriesDefinition, new SeriesRow(_dates[0], _values[0]));
    timeSeriesHolder.addDataPointToSeries(seriesDefinition, new SeriesRow(_dates[1], _values[1]));
    timeSeriesHolder.addDataPointToSeries(seriesDefinition, new SeriesRow(_dates[2], _values[2]));

    timeSeriesHolder.endSeries(seriesDefinition);

    TimeSeriesCollection timeSeriesCollection = (TimeSeriesCollection) timeSeriesHolder.getPopulatedDataset();

    TimeSeries actualTimeSeries = timeSeriesCollection.getSeries(SERIES_LEGEND);
    for(int i = 0; i < NUMBER_OF_DATA_POINTS; i++)
    {
        TimeSeriesDataItem dataItem0 = actualTimeSeries.getDataItem(i);
        assertEquals(_dates[i].getTime(), dataItem0.getPeriod().getMiddleMillisecond());
        assertEquals(_values[i], dataItem0.getValue());
    }
}
 

/**
 * A helper function to convert data points (from startIndex to
 * endIndex) of a (JFreeChart) TimeSeries object into an
 * OpenForecast DataSet.
 * @param series the series of data points stored as a JFreeChart
 * TimeSeries object.
 * @param startIndex the index of the first data point required from the
 * series.
 * @param endIndex the index of the last data point required from the
 * series.
 * @return an OpenForecast DataSet representing the data points extracted
 * from the TimeSeries.
 */
private DataSet getDataSet( TimeSeries series,
                            int startIndex, int endIndex )
{
    DataSet dataSet = new DataSet();
    if ( endIndex > series.getItemCount() )
        endIndex = series.getItemCount();
    
    for ( int i=startIndex; i<endIndex; i++ )
        {
            TimeSeriesDataItem dataPair = series.getDataItem(i);
            DataPoint dp = new Observation( dataPair.getValue().doubleValue() );
            dp.setIndependentValue( "t", i );
            dataSet.add( dp );
        }
    
    return dataSet;
}
 

/**
 * A helper function to convert data points (from startIndex to
 * endIndex) of a (JFreeChart) TimeSeries object into an
 * OpenForecast DataSet.
 * @param series the series of data points stored as a JFreeChart
 * TimeSeries object.
 * @param startIndex the index of the first data point required from the
 * series.
 * @param endIndex the index of the last data point required from the
 * series.
 * @return an OpenForecast DataSet representing the data points extracted
 * from the TimeSeries.
 */
private DataSet getDataSet( TimeSeries series,
                            int startIndex, int endIndex )
{
    DataSet dataSet = new DataSet();
    if ( endIndex > series.getItemCount() )
        endIndex = series.getItemCount();
    
    for ( int i=startIndex; i<endIndex; i++ )
        {
            TimeSeriesDataItem dataPair = series.getDataItem(i);
            DataPoint dp = new Observation( dataPair.getValue().doubleValue() );
            dp.setIndependentValue( "t", i );
            dataSet.add( dp );
        }
    
    return dataSet;
}
 

/**
 * Outputs the given DataPoint to the current TimeSeries.
 * @param dataPoint the DataPoint to output to the current TimeSeries.
 */
private void output( DataPoint dataPoint, String timeVariable )
    throws InstantiationException, IllegalAccessException,
    InvocationTargetException, InstantiationException
{
    long timeValue = (long)dataPoint.getIndependentValue(timeVariable);
    
    Object[] args = new Object[1];
    args[0] = new Date( timeValue );
    RegularTimePeriod period
        = (RegularTimePeriod)timePeriodConstructor.newInstance(args);
    
    double value = dataPoint.getDependentValue();
    
    timeSeries.add( new TimeSeriesDataItem(period,value) );
}
 

/**
 * Test the equals() method.
 */
public void testEquals() {
    TimeSeriesDataItem item1 = new TimeSeriesDataItem(
        new Day(23, 9, 2001), 99.7
    );
    TimeSeriesDataItem item2 = new TimeSeriesDataItem(
        new Day(23, 9, 2001), 99.7
    );
    assertTrue(item1.equals(item2));
    assertTrue(item2.equals(item1));

    item1.setValue(new Integer(5));
    assertFalse(item1.equals(item2));
    item2.setValue(new Integer(5));
    assertTrue(item1.equals(item2));
}
 

/**
 * Test the setMaximumItemCount() method to ensure that it removes items
 * from the series if necessary.
 */
public void testSetMaximumItemCount() {
    TimeSeries s1 = new TimeSeries("S1");
    s1.add(new Year(2000), 13.75);
    s1.add(new Year(2001), 11.90);
    s1.add(new Year(2002), null);
    s1.add(new Year(2005), 19.32);
    s1.add(new Year(2007), 16.89);
    assertTrue(s1.getItemCount() == 5);

    s1.setMaximumItemCount(3);
    assertTrue(s1.getItemCount() == 3);
    TimeSeriesDataItem item = s1.getDataItem(0);
    assertTrue(item.getPeriod().equals(new Year(2002)));
    assertEquals(16.89, s1.getMinY(), EPSILON);
    assertEquals(19.32, s1.getMaxY(), EPSILON);
}
 

/**
 * Some more checks for the addOrUpdate() method.
 */
public void testAddOrUpdate4() {
    TimeSeries ts = new TimeSeries("S");
    TimeSeriesDataItem overwritten = ts.addOrUpdate(new Year(2009), 20.09);
    assertNull(overwritten);
    overwritten = ts.addOrUpdate(new Year(2009), 1.0);
    assertEquals(new Double(20.09), overwritten.getValue());
    assertEquals(new Double(1.0), ts.getValue(new Year(2009)));

    // changing the overwritten record shouldn't affect the series
    overwritten.setValue(null);
    assertEquals(new Double(1.0), ts.getValue(new Year(2009)));

    TimeSeriesDataItem item = new TimeSeriesDataItem(new Year(2010), 20.10);
    overwritten = ts.addOrUpdate(item);
    assertNull(overwritten);
    assertEquals(new Double(20.10), ts.getValue(new Year(2010)));
    // changing the item that was added should not change the series
    item.setValue(null);
    assertEquals(new Double(20.10), ts.getValue(new Year(2010)));
}
 

/**
 * Test the equals() method.
 */
public void testEquals() {
    TimeSeriesDataItem item1 = new TimeSeriesDataItem(
        new Day(23, 9, 2001), 99.7
    );
    TimeSeriesDataItem item2 = new TimeSeriesDataItem(
        new Day(23, 9, 2001), 99.7
    );
    assertTrue(item1.equals(item2));
    assertTrue(item2.equals(item1));
    
    item1.setValue(new Integer(5));
    assertFalse(item1.equals(item2));
    item2.setValue(new Integer(5));
    assertTrue(item1.equals(item2));
}
 

/**
 * Test the setMaximumItemCount() method to ensure that it removes items 
 * from the series if necessary.
 */
public void testSetMaximumItemCount() {

    TimeSeries s1 = new TimeSeries("S1", Year.class);
    s1.add(new Year(2000), 13.75);
    s1.add(new Year(2001), 11.90);
    s1.add(new Year(2002), null);
    s1.add(new Year(2005), 19.32);
    s1.add(new Year(2007), 16.89);

    assertTrue(s1.getItemCount() == 5);
    s1.setMaximumItemCount(3);
    assertTrue(s1.getItemCount() == 3);
    TimeSeriesDataItem item = s1.getDataItem(0);
    assertTrue(item.getPeriod().equals(new Year(2002)));

}
 

private TimeSeries computeSingleTimeSeries(final List<Band> bandList, int pixelX, int pixelY, int currentLevel, String positionName) {
    final Band firstBand = bandList.get(0);
    final String firstBandName = firstBand.getName();
    final int lastUnderscore = firstBandName.lastIndexOf("_");
    final String suffix = positionName.isEmpty()?positionName: "_" + positionName;
    final String timeSeriesName = firstBandName.substring(0, lastUnderscore);
    final TimeSeries timeSeries = new TimeSeries(timeSeriesName + suffix);
    for (Band band : bandList) {
        final TimeCoding timeCoding = this.timeSeries.getRasterTimeMap().get(band);
        if (timeCoding != null) {
            final ProductData.UTC startTime = timeCoding.getStartTime();
            final Millisecond timePeriod = new Millisecond(startTime.getAsDate(),
                                                           ProductData.UTC.UTC_TIME_ZONE,
                                                           Locale.getDefault());
            final double value = getValue(band, pixelX, pixelY, currentLevel);
            timeSeries.add(new TimeSeriesDataItem(timePeriod, value));
        }
    }
    return timeSeries;
}
 

/**
* <p>Update the panel with a new price on a date, from
* current, 50-point or 200-point averages.
* </p>
* 
* @param name Current, 50 point average or 200 point average
* @param day The day that price occurred
* @param rate In US Dollars, the price of Bitcoin
*/
  public void update(String name, LocalDate localDate, double rate) {
Day day = new Day(localDate.getDayOfMonth(), localDate.getMonthValue(), localDate.getYear());

  	// Add the relevant price into the time series array
  	for (int i=0 ; i < MyConstants.CHART_LINES.length; i++) {
  		if (MyConstants.CHART_LINES[i].equals(name)) {
		this.timeSeries[i].addOrUpdate(new TimeSeriesDataItem(day, rate));
   		}
  	}
  }
 

/**
 * Builds a DataPoint from the given TimeSeriesDataItem. The name used for
 * the independent, time variable can be changed using the setTimeVariable
 * method.
 * @param dataItem the TimeSeriesDataItem from which the values are to be
 * read and used to construct a new DataPoint.
 * @return a DataPoint object with values as specified by the given
 * TimeSeriesDataItem.
 */
private DataPoint build( TimeSeriesDataItem dataItem )
{
    DataPoint dataPoint
        = new Observation( dataItem.getValue().doubleValue() );
    
    // Get time value (at middle of time period)
    double timeValue = dataItem.getPeriod().getMiddleMillisecond();
    
    // Store time value as independent variable
    dataPoint.setIndependentValue( getVariableName(0),
                                   timeValue );
    
    return dataPoint;
}
 

@Override
public List getItems() {
    return new AbstractList<TimeSeriesDataItem>() {
        @Override
        public TimeSeriesDataItem get(int index) {
            return getDataItem(index);
        }

        @Override
        public int size() {
            return getItemCount();
        }  
    };
}
 

/**
 * Test that an instance is equal to itself.
 *
 * SourceForge Bug ID: 558850.
 */
public void testEqualsSelf() {
    TimeSeriesDataItem item = new TimeSeriesDataItem(
        new Day(23, 9, 2001), 99.7
    );
    assertTrue(item.equals(item));
}
 

/**
 * Create a TimeSeriesDataItem, add it to a TimeSeries.  Now, modifying
 * the original TimeSeriesDataItem should NOT affect the TimeSeries.
 */
public void testAdd_TimeSeriesDataItem() {
    TimeSeriesDataItem item = new TimeSeriesDataItem(new Year(2009), 1.0);
    TimeSeries series = new TimeSeries("S1");
    series.add(item);
    assertTrue(item.equals(series.getDataItem(0)));
    item.setValue(new Double(99.9));
    assertFalse(item.equals(series.getDataItem(0)));
}
 

/**
 * Test that an instance is equal to itself.
 *
 * SourceForge Bug ID: 558850.
 */
public void testEqualsSelf() {
    TimeSeriesDataItem item = new TimeSeriesDataItem(
        new Day(23, 9, 2001), 99.7
    );
    assertTrue(item.equals(item));
}
 

@Override
public TimeSeries validate(TimeSeries timeSeries, String sourceName, TimeSeriesType type) throws ParseException {
    String qualifiedSourceName = createQualifiedSourcename(sourceName, type);
    final Symbol symbol = namespace.resolveSymbol(qualifiedSourceName);
    if (symbol == null) {
        throw new ParseException("No variable for identifier '" + qualifiedSourceName + "' registered.");
    }
    final String expression = getExpressionFor(qualifiedSourceName);
    if (expression == null || expression.trim().isEmpty()) {
        return timeSeries;
    }
    final Variable variable = (Variable) symbol;
    final Term term = parser.parse(expression, namespace);

    final int seriesCount = timeSeries.getItemCount();
    final TimeSeries validatedSeries = new TimeSeries(timeSeries.getKey());
    for (int i = 0; i < seriesCount; i++) {
        final TimeSeriesDataItem dataItem = timeSeries.getDataItem(i);
        final Number value = dataItem.getValue();
        variable.assignD(null, value.doubleValue());
        if (term.evalB(null)) {
            validatedSeries.add(dataItem);
        }
    }

    return validatedSeries;
}
 

protected ExtTimeTableXYDataset convertToTable( final XYDataset xyDataset ) {
  final TimeSeriesCollection timeSeriesCollection = (TimeSeriesCollection) xyDataset;
  final ExtTimeTableXYDataset tableXYDataset = new ExtTimeTableXYDataset();
  final int count = timeSeriesCollection.getSeriesCount();
  for ( int i = 0; i < count; i++ ) {
    final Comparable key = timeSeriesCollection.getSeriesKey( i );
    final TimeSeries timeSeries = timeSeriesCollection.getSeries( i );
    final int itemCount = timeSeries.getItemCount();
    for ( int ic = 0; ic < itemCount; ic++ ) {
      final TimeSeriesDataItem seriesDataItem = timeSeries.getDataItem( ic );
      tableXYDataset.add( seriesDataItem.getPeriod(), seriesDataItem.getValue(), key, false );
    }
  }
  return tableXYDataset;
}
 

@Override
public DatasetMap calculateValue() throws Exception {
	logger.debug("IN");

	DatasetMap datasets = super.calculateValue();
	if(datasets==null || yearsDefined==null){
		logger.error("Error in TrargetCharts calculate value");
		return null;
	}
	DefaultCategoryDataset dataset = new DefaultCategoryDataset(); 		
	datasets.addDataset("1",dataset);

	if(datasets!=null && yearsDefined.isEmpty()){
		logger.warn("no rows found with dataset");
	}
	else{

		// Check if defining target and baseline
		Double mainTarget=null;
		Double mainBaseline=null;
		if(mainThreshold==null){
			logger.error("No main target or baseline defined, not possible to draw the chart");
		}
		else{
			if(useTargets)mainTarget=mainThreshold;
			else mainBaseline=mainThreshold;
			nullValues=new Vector<String>();

			// run all the years defined
			for (Iterator iterator = yearsDefined.iterator(); iterator.hasNext();) {
				String currentYearS = (String) iterator.next();
				int currentYear=Integer.valueOf(currentYearS).intValue();
				boolean stop=false;
				for(int i = 1; i < 13 && stop==false; i++) {
					Month currentMonth=new Month(i,currentYear);
					// if it is the first year and th ecurrent month is previous than the first month
					if(currentYearS.equalsIgnoreCase(yearsDefined.first()) && i<firstMonth.getMonth()){
						// continue
					}
					else{
						TimeSeriesDataItem item = timeSeries.getDataItem(currentMonth);
						if(item != null && item.getValue() != null) {
							double v = item.getValue().doubleValue();
							double result = 0;
							if(mainTarget != null) {
								result = (v >= mainTarget.doubleValue())?WIN:LOSE;
							} else if(mainBaseline != null) {
								result = (v > mainBaseline.doubleValue())?LOSE:WIN;
							}
							else{
								logger.warn("could not find a threshold");
							}

							dataset.addValue(result, timeSeries.getKey(), "" + i+"-"+currentYear);   

						} else {
							if(wlt_mode.doubleValue() == 5){
								dataset.addValue(0.001, timeSeries.getKey(), "" + i+"-"+currentYear); 
								nullValues.add("" + i+"-"+currentYear);
							}
							else{
								dataset.addValue(0.0, timeSeries.getKey(), "" + i+"-"+currentYear); 							
							}
						}
						// if it is last year and current month is after the last month stop 
						if(currentYearS.equalsIgnoreCase(lastYear) && i>=lastMonth.getMonth()){
							stop=true;
						}

					} 
				}

			}
		}
	}
	logger.debug("OUT");
	return datasets;
}
 

@Override
public DatasetMap calculateValue() throws Exception {
	logger.debug("IN");

	DatasetMap datasets = super.calculateValue();
	if(datasets==null || yearsDefined==null){
		logger.error("Error in TrargetCharts calculate value");
		return null;
	}

	TimeSeriesCollection dataset = new TimeSeriesCollection(); 
	if(datasets!=null && yearsDefined.isEmpty()){
		logger.warn("no rows found with dataset");
	}
	else{

		int itemCount = timeSeries.getItemCount();		
		// this is the main time series, to be linked with Line and shape
		dataset.addSeries(timeSeries);

		// Check if defining target and baseline
		Double mainTarget=null;
		Double mainBaseline=null;
		if(useTargets)mainTarget=mainThreshold;
		else mainBaseline=mainThreshold;

		// run all the years defined
		lastIndexMonth = 1;
		for (Iterator iterator = yearsDefined.iterator(); iterator.hasNext();) {
			String currentYearS = (String) iterator.next();
			int currentYear=Integer.valueOf(currentYearS).intValue();
			// get the last in l
			for(int i = 1; i < 13; i++) {
				TimeSeriesDataItem item = timeSeries.getDataItem(new Month(i, currentYear));
				if(item == null || item.getValue() == null) {
					//timeSeries.addOrUpdate(new Month(i, currentYear), null);
				} else {
					lastIndexMonth = i;
				}
			}
		}
	}
	datasets.addDataset("1",dataset);

	logger.debug("OUT");
	return datasets;
}
 

@Override
public void add(TimeSeriesDataItem arg0, boolean arg1) {
    throw new UnsupportedOperationException();
}
 

@Override
public void add(TimeSeriesDataItem item) {
    throw new UnsupportedOperationException();
}
 

@Override
public TimeSeriesDataItem addOrUpdate(RegularTimePeriod period, double value) {
    throw new UnsupportedOperationException();
}
 

@Override
public TimeSeriesDataItem addOrUpdate(RegularTimePeriod period, Number value) {
    throw new UnsupportedOperationException();
}
 

@Override
public TimeSeriesDataItem addOrUpdate(TimeSeriesDataItem arg0) {
    throw new UnsupportedOperationException();
}
 

@Override
public TimeSeriesDataItem getDataItem(int index) {
    return new TimeSeriesDataItem(getTimePeriod(index), series.getData().get(index));
}
 

@Override
public TimeSeriesDataItem getDataItem(RegularTimePeriod period) {
    return new TimeSeriesDataItem(period, series.getData().get(getIndex(period)));
}