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public interface Aggregator
Describes an aggregation operator, such as "sum" or "count".
FunDef
,
Evaluator
Method Summary | |
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java.lang.Object |
aggregate(Evaluator evaluator,
java.util.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 |
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Aggregator getRollup()
java.lang.Object aggregate(Evaluator evaluator, java.util.List members, Calc calc)
evaluator
- Evaluation contextmembers
- List of members, not nullcalc
- Expression to evaluate
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