AggregationFunctionFactory (Esper API Documentation)

```
public interface AggregationFunctionFactory
```
Interface to implement for factories of aggregation functions.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`default void`	`applyEnterCodegenManaged(AggregationFunctionFactoryCodegenRowApplyContextManaged context)` Generate code for apply-enter, applicable only for `AggregationFunctionFactoryCodegenType.CODEGEN_MANAGED`
`default void`	`applyEnterCodegenUnmanaged(AggregationFunctionFactoryCodegenRowApplyContextUnmanaged context)` Generate code for apply-enter, applicable only for `AggregationFunctionFactoryCodegenType.CODEGEN_UNMANAGED`
`default void`	`applyLeaveCodegenManaged(AggregationFunctionFactoryCodegenRowApplyContextManaged context)` Generate code for apply-leave, applicable only for `AggregationFunctionFactoryCodegenType.CODEGEN_MANAGED`
`default void`	`applyLeaveCodegenUnmanaged(AggregationFunctionFactoryCodegenRowApplyContextUnmanaged context)` Generate code for apply-leave, applicable only for `AggregationFunctionFactoryCodegenType.CODEGEN_UNMANAGED`
`default void`	`clearCodegen(AggregationFunctionFactoryCodegenRowClearContext context)` Generate code for clear
`default AggregationFunctionFactoryCodegenType`	`getCodegenType()` Returns the code generation control enum
`default void`	`getValueCodegen(AggregationFunctionFactoryCodegenRowGetValueContext context)` Generate code for get-value
`java.lang.Class`	`getValueType()` Returns the type of the current value.
`AggregationMethod`	`newAggregator()` Make a new, initalized aggregation state.
`default void`	`rowMemberCodegen(AggregationFunctionFactoryCodegenRowMemberContext context)` Generate code for row-members.
`void`	`setFunctionName(java.lang.String functionName)` Sets the EPL function name assigned to the factory.
`void`	`validate(AggregationValidationContext 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(java.lang.String functionName)
```
    Sets the EPL function name assigned to the factory.
    
    Parameters:
    
    functionName - assigned
  - validate
```
void validate(AggregationValidationContext 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.
    
    Parameters:
    
    validationContext - expression information
  - newAggregator
```
AggregationMethod newAggregator()
```
    Make a new, initalized aggregation state.
    
    Returns:
    
    initialized aggregator
  - getValueType
```
java.lang.Class getValueType()
```
    Returns the type of the current value.
    
    Returns:
    
    type of value returned by the aggregation methods
  - getCodegenType
```
default AggregationFunctionFactoryCodegenType getCodegenType()
```
    Returns the code generation control enum
    
    Returns:
    
    enum
  - rowMemberCodegen
```
default void rowMemberCodegen(AggregationFunctionFactoryCodegenRowMemberContext context)
```
    Generate code for row-members.
    
    Parameters:
    
    context - context
  - applyEnterCodegenManaged
```
default void applyEnterCodegenManaged(AggregationFunctionFactoryCodegenRowApplyContextManaged context)
```
    Generate code for apply-enter, applicable only for AggregationFunctionFactoryCodegenType.CODEGEN_MANAGED
    
    Parameters:
    
    context - context
  - applyLeaveCodegenManaged
```
default void applyLeaveCodegenManaged(AggregationFunctionFactoryCodegenRowApplyContextManaged context)
```
    Generate code for apply-leave, applicable only for AggregationFunctionFactoryCodegenType.CODEGEN_MANAGED
    
    Parameters:
    
    context - context
  - applyEnterCodegenUnmanaged
```
default void applyEnterCodegenUnmanaged(AggregationFunctionFactoryCodegenRowApplyContextUnmanaged context)
```
    Generate code for apply-enter, applicable only for AggregationFunctionFactoryCodegenType.CODEGEN_UNMANAGED
    
    Parameters:
    
    context - context
  - applyLeaveCodegenUnmanaged
```
default void applyLeaveCodegenUnmanaged(AggregationFunctionFactoryCodegenRowApplyContextUnmanaged context)
```
    Generate code for apply-leave, applicable only for AggregationFunctionFactoryCodegenType.CODEGEN_UNMANAGED
    
    Parameters:
    
    context - context
  - clearCodegen
```
default void clearCodegen(AggregationFunctionFactoryCodegenRowClearContext context)
```
    Generate code for clear
    
    Parameters:
    
    context - context
  - getValueCodegen
```
default void getValueCodegen(AggregationFunctionFactoryCodegenRowGetValueContext context)
```
    Generate code for get-value
    
    Parameters:
    
    context - context

Interface AggregationFunctionFactory

Method Summary

Method Detail

setFunctionName

validate

newAggregator

getValueType

getCodegenType

rowMemberCodegen

applyEnterCodegenManaged

applyLeaveCodegenManaged

applyEnterCodegenUnmanaged

applyLeaveCodegenUnmanaged

clearCodegen

getValueCodegen