VariableOperators (Spring Data MongoDB 2.1.0.RELEASE API)

java.lang.Object
- org.springframework.data.mongodb.core.aggregation.VariableOperators

```
public class VariableOperators
extends Object
```
Gateway to variable aggregation operations.

Since:

1.10

Author:

Christoph Strobl, Mark Paluch

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`VariableOperators.Let` `AggregationExpression` for `$let` that binds `AggregationExpression` to variables for use in the specified `in` expression, and returns the result of the expression.
`static class`	`VariableOperators.Map` `AggregationExpression` for `$map`.

Constructor Summary

Constructors
Constructor and Description

VariableOperators()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static VariableOperators.Let.LetBuilder`	`define(Collection<VariableOperators.Let.ExpressionVariable> variables)` Start creating new `VariableOperators.Let` that allows definition of `VariableOperators.Let.ExpressionVariable` that can be used within a nested `AggregationExpression`.
`static VariableOperators.Let.LetBuilder`	`define(VariableOperators.Let.ExpressionVariable... variables)` Start creating new `VariableOperators.Let` that allows definition of `VariableOperators.Let.ExpressionVariable` that can be used within a nested `AggregationExpression`.
`static VariableOperators.Map.AsBuilder`	`mapItemsOf(AggregationExpression expression)` Starts building new `VariableOperators.Map` that applies an `AggregationExpression` to each item of a referenced array and returns an array with the applied results.
`static VariableOperators.Map.AsBuilder`	`mapItemsOf(String fieldReference)` Starts building new `VariableOperators.Map` that applies an `AggregationExpression` to each item of a referenced array and returns an array with the applied results.

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

- Constructor Detail
  - VariableOperators
```
public VariableOperators()
```
- Method Detail
  - mapItemsOf
```
public static VariableOperators.Map.AsBuilder mapItemsOf(String fieldReference)
```
    Starts building new VariableOperators.Map that applies an AggregationExpression to each item of a referenced array and returns an array with the applied results.
    
    Parameters:
    
    fieldReference - must not be null.
    
    Returns:
  - mapItemsOf
```
public static VariableOperators.Map.AsBuilder mapItemsOf(AggregationExpression expression)
```
    Starts building new VariableOperators.Map that applies an AggregationExpression to each item of a referenced array and returns an array with the applied results.
    
    Parameters:
    
    expression - must not be null.
    
    Returns:
  - define
```
public static VariableOperators.Let.LetBuilder define(VariableOperators.Let.ExpressionVariable... variables)
```
    Start creating new VariableOperators.Let that allows definition of VariableOperators.Let.ExpressionVariable that can be used within a nested AggregationExpression.
    
    Parameters:
    
    variables - must not be null.
    
    Returns:
  - define
```
public static VariableOperators.Let.LetBuilder define(Collection<VariableOperators.Let.ExpressionVariable> variables)
```
    Start creating new VariableOperators.Let that allows definition of VariableOperators.Let.ExpressionVariable that can be used within a nested AggregationExpression.
    
    Parameters:
    
    variables - must not be null.
    
    Returns:

Class VariableOperators

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

VariableOperators

Method Detail

mapItemsOf

mapItemsOf

define

define