Accumulator (Morphia)

java.lang.Object
- dev.morphia.aggregation.experimental.expressions.impls.Expression
- - dev.morphia.aggregation.experimental.expressions.impls.Accumulator

```
public class Accumulator
extends Expression
```
Base class for the accumulator expression types.

Since:

2.0

Constructor Summary

Constructors
Constructor Description

Accumulator(String operation, List<Expression> values)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`encode(Mapper mapper, org.bson.BsonWriter writer, org.bson.codecs.EncoderContext encoderContext)`

Methods inherited from class dev.morphia.aggregation.experimental.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
  - Accumulator
```
public Accumulator(String operation,
                   List<Expression> values)
```
    Parameters:
    
    operation -
    
    values -
    
    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(Mapper mapper,
                   org.bson.BsonWriter writer,
                   org.bson.codecs.EncoderContext encoderContext)
```
    Overrides:
    
    encode in class Expression
    
    Parameters:
    
    mapper - the mapper
    
    writer - the writer
    
    encoderContext - the context