Accumulator (Morphia)

java.lang.Object
- dev.morphia.aggregation.expressions.impls.Expression
- - dev.morphia.aggregation.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(Datastore datastore, BsonWriter writer, EncoderContext encoderContext)`
`ExpressionList`	`getValue()`

Methods inherited from class dev.morphia.aggregation.expressions.impls.Expression
getOperation, toString

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - Accumulator
```
@MorphiaInternal
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(Datastore datastore,
                   BsonWriter writer,
                   EncoderContext encoderContext)
```
    Overrides:
    
    encode in class Expression
    
    Parameters:
    
    datastore - the datastore
    
    writer - the writer
    
    encoderContext - the context
  - getValue
```
public ExpressionList getValue()
```
    Overrides:
    
    getValue in class Expression
    
    Returns:
    
    the value