Package dev.morphia.aggregation.expressions.impls

Class AccumulatorExpression

java.lang.Object

dev.morphia.aggregation.expressions.impls.Expression

dev.morphia.aggregation.expressions.impls.AccumulatorExpression

public class AccumulatorExpression
extends Expression

Since:

2.1

Constructor Summary

Constructors

Constructor	Description
AccumulatorExpression(String initFunction, String accumulateFunction, List<Expression> accumulateArgs, String mergeFunction)

Method Summary

Modifier and Type	Method	Description
void	encode(Datastore datastore, BsonWriter writer, EncoderContext encoderContext)
AccumulatorExpression	finalizeFunction(String finalizeFunction)	Optional.
AccumulatorExpression	initArgs(List<Expression> initArgs)	Optional.

Methods inherited from class dev.morphia.aggregation.expressions.impls.Expression

getOperation, getValue, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

AccumulatorExpression

@MorphiaInternal
public AccumulatorExpression(String initFunction,
                             String accumulateFunction,
                             List<Expression> accumulateArgs,
                             String mergeFunction)

Parameters:

initFunction -

accumulateFunction -

accumulateArgs -

mergeFunction -

Developer note.

This is an internal item. Its function and presence are subject to change without warning. Its use is highly discouraged.

Method Detail

encode

public void encode(Datastore datastore,
                   BsonWriter writer,
                   EncoderContext encoderContext)

Overrides:

encode in class Expression

Parameters:

datastore - the datastore

writer - the writer

encoderContext - the context

finalizeFunction

public AccumulatorExpression finalizeFunction(String finalizeFunction)

Optional. Function used to update the result of the accumulation.

Parameters:

finalizeFunction - the function body

Returns:

this

initArgs

public AccumulatorExpression initArgs(List<Expression> initArgs)

Optional. Arguments passed to the init function.

Parameters:

initArgs - the arguments

Returns:

this