mondrian.olap
Interface Aggregator

All Known Implementing Classes:

RolapAggregator, RolapAggregator.AvgFromAvg, RolapAggregator.AvgFromSum, RolapAggregator.BaseAggor, RolapAggregator.SumFromAvg

public interface Aggregator

Describes an aggregation operator, such as "sum" or "count".

Since:

Jul 9, 2003$

Author:

jhyde$

See Also:

FunDef, Evaluator

Method Summary

Object	aggregate(Evaluator evaluator, List members, Calc calc) Applies this aggregator to an expression over a set of members and returns the result.
Aggregator	getRollup() Returns the aggregator used to combine sub-totals into a grand-total.

Method Detail

getRollup

Aggregator getRollup()

Returns the aggregator used to combine sub-totals into a grand-total.

aggregate

Object aggregate(Evaluator evaluator,
                 List members,
                 Calc calc)

Applies this aggregator to an expression over a set of members and returns the result.

Parameters:

evaluator - Evaluation context

members - List of members, not null

calc - Expression to evaluate