public Object clone() {
try {
final ItemMinFunction function = (ItemMinFunction) super.clone();
function.min = min.clone();
return function;
} catch (CloneNotSupportedException e) {
throw new IllegalStateException();
}
}
/**
* Receives notification that a row of data is being processed. Reads the data from the field
* defined for this function and calculates the minimum value.
*
* @param event Information about the event.
*/
public void itemsAdvanced(final ReportEvent event) {
if (field == null) {
return;
}
final Object fieldValue = event.getDataRow().get(getField());
if (fieldValue instanceof Comparable == false) {
return;
}
try {
final Comparable compare = (Comparable) fieldValue;
final Comparable oldValue = min.get(lastGroupSequenceNumber);
if (oldValue == null || oldValue.compareTo(compare) > 0) {
min.set(lastGroupSequenceNumber, compare);
}
} catch (Exception e) {
ItemMinFunction.logger.error("ItemMinFunction.advanceItems(): problem adding number.");
}
}
/**
* Return a completly separated copy of this function. The copy does no longer share any
* changeable objects with the original function.
*
* @return a copy of this function.
*/
public Expression getInstance() {
final ItemMinFunction function = (ItemMinFunction) super.getInstance();
function.min = min.clone();
function.lastGroupSequenceNumber = 0;
return function;
}
/**
* Returns the function value, in this case the running total of a specific column in the report's
* data row.
*
* @return The function value.
*/
public Object getValue() {
return min.get(lastGroupSequenceNumber);
}