uk.gov.gchq.gaffer.function.processor

Class Aggregator.Builder<R>

java.lang.Object

uk.gov.gchq.gaffer.function.processor.Aggregator.Builder<R>

Type Parameters:

R - The type of reference used by tuples.

Enclosing class:

Aggregator<R>

public static class Aggregator.Builder<R>
extends Object

Implementation of the Builder pattern for Aggregator.

Constructor Summary

Constructors

Constructor and Description
Builder() Create a Builder to configure a new Aggregator.
Builder(Aggregator<R> aggregator) Create a Builder to configure an Aggregator.

Method Summary

Modifier and Type	Method and Description
Aggregator<R>	build() Build the Aggregator configured by this Builder.
Aggregator.Builder<R>	execute(AggregateFunction function) Set the AggregateFunction to be executed by the current PassThroughFunctionContext.
Aggregator.Builder<R>	select(R... selection) Set the selection references for the current PassThroughFunctionContext.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Builder

public Builder()

Create a Builder to configure a new Aggregator.

Builder

public Builder(Aggregator<R> aggregator)

Create a Builder to configure an Aggregator.

Parameters:

aggregator - Aggregator to be configured.

Method Detail

select

public Aggregator.Builder<R> select(R... selection)

Set the selection references for the current PassThroughFunctionContext. If the current context already has a selection set, a new context is created and made current. Returns this Builder for further configuration.

Parameters:

selection - Selection references.

Returns:

This Builder.

execute

public Aggregator.Builder<R> execute(AggregateFunction function)

Set the AggregateFunction to be executed by the current PassThroughFunctionContext. If the current context already has a function set, a new context is created and made current. Returns this Builder for further configuration.

Parameters:

function - AggregateFunction to be executed.

Returns:

This Builder.

build

public Aggregator<R> build()

Build the Aggregator configured by this Builder.

Returns:

Configured Aggregator.