Interface IAggregatorFactory
public interface IAggregatorFactory
Describes an aggregation operator keyword, potentially with type polymorphism. The actual runtime
IMultisetAggregationOperator
that implements the aggregation logic may depend on the type context.
Implementors are suggested to use lower-case classnames (as it will end up in the language) and are required use the
annotation AggregatorType
to indicate type inference rules.
Important! Implemented aggregators must be (1) deterministic (2) pure and (3)support incremental value updates in the internal operation.
- Since:
- 1.4
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Method Summary
Modifier and TypeMethodDescriptiongetAggregatorLogic
(Class<?> domainClass) Given type parameters selected fromAggregatorType
annotations, returns a run-time aggregator operator that is bound to the actual types.
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Method Details
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getAggregatorLogic
Given type parameters selected fromAggregatorType
annotations, returns a run-time aggregator operator that is bound to the actual types.- Parameters:
domainClass
- Java type of the values that are being aggregated- Returns:
- the actual run-time aggregator logic, with type bindings
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