A CollectAggregator is an Aggregator that extracts the property values and adds them to a List, which is returned when finished. If no values were encountered, then the returned list is empty. This Aggregator does not use floating-point calculations, so it does not override the terminateDoubleDouble method.
Create and use a CollectAggregator, with one of the following methods:
There is no restriction on the type of property values expected.
The list is built by adding the property values in the order in which jAgg finds them in the original list of values.