org.springframework.data.mongodb.core.aggregation

Class AggregationSpELExpression

java.lang.Object

org.springframework.data.mongodb.core.aggregation.AggregationSpELExpression

All Implemented Interfaces:

AggregationExpression

public class AggregationSpELExpression
extends Object
implements AggregationExpression

An AggregationExpression that renders a MongoDB Aggregation Framework expression from the AST of a SpEL expression.

Samples:

 // { $and: [ { $gt: [ "$qty", 100 ] }, { $lt: [ "$qty", 250 ] } ] }
 expressionOf("qty > 100 && qty < 250);

 // { $cond : { if : { $gte : [ "$a", 42 ]}, then : "answer", else : "no-answer" } }
 expressionOf("cond(a >= 42, 'answer', 'no-answer')");
 

Since:

1.10

Author:

Christoph Strobl, Mark Paluch

See Also:

SpelExpressionTransformer

Method Summary

Modifier and Type	Method and Description
static AggregationSpELExpression	expressionOf(String expressionString, Object... parameters) Creates new AggregationSpELExpression for the given expressionString and parameters.
org.bson.Document	toDocument(AggregationOperationContext context) Turns the AggregationExpression into a Document within the given AggregationOperationContext.

Methods inherited from class java.lang.Object

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

Method Detail

expressionOf

public static AggregationSpELExpression expressionOf(String expressionString,
                                                     Object... parameters)

Creates new AggregationSpELExpression for the given expressionString and parameters.

Parameters:

expressionString - must not be null.

parameters - can be empty.

Returns:

toDocument

public org.bson.Document toDocument(AggregationOperationContext context)

Description copied from interface: AggregationExpression

Turns the AggregationExpression into a Document within the given AggregationOperationContext.

Specified by:

toDocument in interface AggregationExpression

Returns: