public Interval locate(DataColumn column, Integer intervalIndex) {
ColumnGroup columnGroup = column.getColumnGroup();
Date columnMinDate = (Date) column.getMinValue();
String type = column.getIntervalType();
if (columnGroup == null) return null;
if (columnMinDate == null) return null;
if (type == null) return null;
// Calculate the interval min. date.
DateIntervalType intervalType = DateIntervalType.getByName(type);
Calendar c = firstIntervalDate(intervalType, columnMinDate, columnGroup);
nextIntervalDate(c, intervalType, intervalIndex);
Date intervalMinDate = c.getTime();
// Calculate the interval max. date.
nextIntervalDate(c, intervalType, 1);
Date intervalMaxDate = c.getTime();
// Build & return the selected interval
return new IntervalDateRange(intervalIndex, intervalType, intervalMinDate, intervalMaxDate);
}
public IntervalList build(DataColumn dataColumn) {
ColumnGroup columnGroup = dataColumn.getColumnGroup();
Date minDate = (Date) dataColumn.getMinValue();
Date maxDate = (Date) dataColumn.getMaxValue();
IntervalDateRangeList results = new IntervalDateRangeList(columnGroup);
if (minDate == null || maxDate == null) {
return results;
}
DateIntervalType intervalType = DateIntervalType.getByName(dataColumn.getIntervalType());
if (intervalType == null) {
intervalType = DateIntervalType.YEAR;
}
Calendar c = firstIntervalDate(intervalType, minDate, columnGroup);
int counter = 0;
while (c.getTime().compareTo(maxDate) <= 0) {
Date intervalMinDate = c.getTime();
// Create the next interval
nextIntervalDate(c, intervalType, 1);
Date intervalMaxDate = c.getTime();
IntervalDateRange interval =
new IntervalDateRange(counter++, intervalType, intervalMinDate, intervalMaxDate);
results.add(interval);
}
// Reverse intervals if requested
boolean asc = columnGroup.isAscendingOrder();
if (!asc) Collections.reverse(results);
// Return the results
results.setIntervalType(intervalType.toString());
results.setMinValue(minDate);
results.setMaxValue(maxDate);
return results;
}