Package cascading.operation.aggregator

Class Summary

Class	Description
Average	Class Average is an Aggregator that returns the average of all numeric values in the current group.
Average.Context	Class Context is used to hold intermediate values.
Count	Class Count is an Aggregator that calculates the number of items in the current group.
ExtentBase	Class ExtentBase is the base class for First and Last.
ExtremaValueBase	Class ExtremaValueBase is the base class for MaxValue and MinValue where the values are expected to by Comparable types and the Comparable.compareTo(Object) result is use for max/min comparison.
ExtremaValueBase.Context
First	Class First is an Aggregator that returns the first Tuple encountered in a grouping.
Last	Class Last is an Aggregator that returns the last Tuple encountered.
MaxValue	Class MaxValue is an Aggregator that returns the maximum value encountered in the current group.
MinValue	Class Min is an Aggregator that returns the minimum value encountered in the current group.
Sum	Class Sum is an Aggregator that returns the sum of all numeric values in the current group.