Module datarush.library

Package com.pervasive.datarush.functions

Interface FunctionInvoker

All Known Implementing Classes:

DefaultFunctionInvoker, FormatFunctionInvoker, ListFunctionInvoker, WavgFunctionInvoker

public interface FunctionInvoker

A FunctionInvoker is used by the FunctionRegistry to invoke a function method and by the AggregationInvoker to invoke an aggregation method.

The implementing class essentially translates an array of ScalarValuedFunction arguments into the proper format for a given function method.

A function method can specify its invoker using the Invoker annotation.

Method Summary

Modifier and Type	Method	Description
Object	invoke(Method m, ScalarValuedFunction[] args)	Invokes a method to return a ScalarValuedFunction, using the given arguments.

Method Detail

invoke

Object invoke(Method m,
              ScalarValuedFunction[] args)
       throws IllegalArgumentException,
              IllegalAccessException,
              InvocationTargetException

Invokes a method to return a ScalarValuedFunction, using the given arguments.

Parameters:

m - The method to invoke.

args - The ScalarValuedFunction arguments from the call to the FunctionRegistry.

Returns:

The ScalarValuedFunction or Aggregation returned by invoking the method.

Throws:

IllegalArgumentException

IllegalAccessException

InvocationTargetException