com.espertech.esper.common.client.hook.aggfunc

Interface AggregationFunctionForge

public interface AggregationFunctionForge

Compile-time representation of a plug-in aggregation function.

Method Summary

Modifier and Type	Method and Description
AggregationFunctionMode	getAggregationFunctionMode() Describes to the compiler how it should manage code for the aggregation function.
Class	getValueType() Returns the type of the current value.
void	setFunctionName(String functionName) Sets the EPL function name assigned to the factory.
void	validate(AggregationFunctionValidationContext validationContext) Implemented by plug-in aggregation functions to allow such functions to validate the type of values passed to the function at statement compile time and to generally interrogate parameter expressions.

Method Detail

setFunctionName

void setFunctionName(String functionName)

Sets the EPL function name assigned to the factory.

Parameters:

functionName - assigned

validate

void validate(AggregationFunctionValidationContext validationContext)
       throws ExprValidationException

Implemented by plug-in aggregation functions to allow such functions to validate the type of values passed to the function at statement compile time and to generally interrogate parameter expressions.

Parameters:

validationContext - expression information

Throws:

ExprValidationException - for validation exception

getValueType

Class getValueType()

Returns the type of the current value.

Returns:

type of value returned by the aggregation methods

getAggregationFunctionMode

AggregationFunctionMode getAggregationFunctionMode()

Describes to the compiler how it should manage code for the aggregation function.

Returns:

mode object