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

Class AggregationSpELExpression

java.lang.Object

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

All Implemented Interfaces:

AggregationExpression, MongoExpression

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	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

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

toDocument

Method Details

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:

new instance of AggregationSpELExpression.

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

Parameters:

context - must not be null.

Returns:

the MongoDB native (Document) form of the expression.