Package tools.refinery.interpreter.matchers.psystem.aggregations

Annotation Interface AggregatorType

@Target(TYPE)
@Retention(RUNTIME)
@Inherited
public @interface AggregatorType

The aggregator type annotation describes the type constraints for the selected aggregator. In version 1.4, two kinds of aggregators are supported:

1. An aggregator that does not consider any parameter value from the call (count), just calculates the number of matches. This is represented by a single Void and a single corresponding return type.
2. An aggregator that considers a single parameter from the call, and executes some aggregate operations over it. Such an aggregate operation can be defined over multiple types, where each possible parameter type has a corresponding return type declared.

Important! The parameterTypes and returnTypes arrays must have

• The same number of classes defined each.
• Items are corresponded by index.
• Items should represent data types

Since:

1.4

Required Element Summary

Required Elements

Modifier and Type	Required Element	Description
Class<?>[]	parameterTypes
Class<?>[]	returnTypes

Element Details

parameterTypes

Class<?>[] parameterTypes

returnTypes

Class<?>[] returnTypes