Package org.springframework.data.mongodb.core.aggregation

Class BucketOperationSupport.OperationOutput

java.lang.Object

org.springframework.data.mongodb.core.aggregation.BucketOperationSupport.Output

org.springframework.data.mongodb.core.aggregation.BucketOperationSupport.OperationOutput

All Implemented Interfaces:

AggregationExpression, MongoExpression

Enclosing class:

BucketOperationSupport<T extends BucketOperationSupport<T,B>,B extends BucketOperationSupport.OutputBuilder<B,T>>

protected static class BucketOperationSupport.OperationOutput
extends BucketOperationSupport.Output

Output field that uses a Mongo operation (expression object) to generate an output field value.
BucketOperationSupport.OperationOutput is used either with a regular field name or an operation keyword (e.g. $sum, $count).

Author:

Mark Paluch

Constructor Summary

Constructors

Constructor	Description
OperationOutput(String operation, Collection<? extends Object> values)	Creates a new BucketOperationSupport.Output for the given field.

Method Summary

Modifier and Type	Method	Description
protected Field	getField()	Returns the field that holds the ProjectionOperation.ProjectionOperationBuilder.OperationProjection.
protected List<Object>	getOperationArguments(AggregationOperationContext context)
org.bson.Document	toDocument(AggregationOperationContext context)	Turns the AggregationExpression into a Document within the given AggregationOperationContext.
BucketOperationSupport.OperationOutput	withAlias(String alias)	Creates a new instance of this BucketOperationSupport.OperationOutput with the given alias.

Methods inherited from class org.springframework.data.mongodb.core.aggregation.BucketOperationSupport.Output

getExposedField

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.data.mongodb.core.aggregation.AggregationExpression

toDocument

Constructor Details

OperationOutput

public OperationOutput(String operation,
 Collection<? extends Object> values)

Creates a new BucketOperationSupport.Output for the given field.

Parameters:

operation - the actual operation key, must not be null or empty.

values - the values to pass into the operation, must not be null.

Method Details

toDocument

public org.bson.Document toDocument(AggregationOperationContext context)

Description copied from interface: AggregationExpression

Turns the AggregationExpression into a Document within the given AggregationOperationContext.

Parameters:

context - must not be null.

Returns:

the MongoDB native (Document) form of the expression.

getOperationArguments

protected List<Object> getOperationArguments(AggregationOperationContext context)

getField

protected Field getField()

Returns the field that holds the ProjectionOperation.ProjectionOperationBuilder.OperationProjection.

Returns:

never null.

withAlias

public BucketOperationSupport.OperationOutput withAlias(String alias)

Creates a new instance of this BucketOperationSupport.OperationOutput with the given alias.

Parameters:

alias - the alias to set

Returns:

new instance of BucketOperationSupport.OperationOutput.