Package com.mongodb.client.model

Class Aggregates

java.lang.Object

com.mongodb.client.model.Aggregates

public final class Aggregates
extends Object

Builders for aggregation pipeline stages.

Since:

3.1

MongoDB documentation

Aggregation pipeline

Since server release

2.2

Method Summary

Modifier and Type	Method	Description
static Bson	addFields(Field<?>... fields)	Creates an $addFields pipeline stage
static Bson	addFields(List<Field<?>> fields)	Creates an $addFields pipeline stage
static <TExpression,Boundary> Bson	bucket(TExpression groupBy, List<Boundary> boundaries)	Creates a $bucket pipeline stage
static <TExpression,TBoundary> Bson	bucket(TExpression groupBy, List<TBoundary> boundaries, BucketOptions options)	Creates a $bucket pipeline stage
static <TExpression> Bson	bucketAuto(TExpression groupBy, int buckets)	Creates a $bucketAuto pipeline stage
static <TExpression> Bson	bucketAuto(TExpression groupBy, int buckets, BucketAutoOptions options)	Creates a $bucketAuto pipeline stage
static Bson	count()	Creates a $count pipeline stage using the field name "count" to store the result
static Bson	count(String field)	Creates a $count pipeline stage using the named field to store the result
static Bson	facet(Facet... facets)	Creates a facet pipeline stage
static Bson	facet(List<Facet> facets)	Creates a facet pipeline stage
static <TExpression> Bson	graphLookup(String from, TExpression startWith, String connectFromField, String connectToField, String as)	Creates a graphLookup pipeline stage for the specified filter
static <TExpression> Bson	graphLookup(String from, TExpression startWith, String connectFromField, String connectToField, String as, GraphLookupOptions options)	Creates a graphLookup pipeline stage for the specified filter
static <TExpression> Bson	group(TExpression id, BsonField... fieldAccumulators)	Creates a $group pipeline stage for the specified filter
static <TExpression> Bson	group(TExpression id, List<BsonField> fieldAccumulators)	Creates a $group pipeline stage for the specified filter
static Bson	limit(int limit)	Creates a $limit pipeline stage for the specified filter
static Bson	lookup(String from, String localField, String foreignField, String as)	Creates a $lookup pipeline stage, joining the current collection with the one specified in from using equality match between the local field and the foreign field
static Bson	lookup(String from, List<? extends Bson> pipeline, String as)	Creates a $lookup pipeline stage, joining the current collection with the one specified in from using the given pipeline
static Bson	lookup(String from, List<Variable<?>> let, List<? extends Bson> pipeline, String as)	Creates a $lookup pipeline stage, joining the current collection with the one specified in from using the given pipeline
static Bson	match(Bson filter)	Creates a $match pipeline stage for the specified filter
static Bson	out(String collectionName)	Creates a $out pipeline stage for the specified filter
static Bson	project(Bson projection)	Creates a $project pipeline stage for the specified projection
static <TExpression> Bson	replaceRoot(TExpression value)	Creates a $replaceRoot pipeline stage
static Bson	sample(int size)	Creates a $sample pipeline stage with the specified sample size
static Bson	skip(int skip)	Creates a $skip pipeline stage
static Bson	sort(Bson sort)	Creates a $sort pipeline stage for the specified sort specification
static <TExpression> Bson	sortByCount(TExpression filter)	Creates a $sortByCount pipeline stage for the specified filter
static Bson	unwind(String fieldName)	Creates a $unwind pipeline stage for the specified field name, which must be prefixed by a '$' sign.
static Bson	unwind(String fieldName, UnwindOptions unwindOptions)	Creates a $unwind pipeline stage for the specified field name, which must be prefixed by a '$' sign.

Methods inherited from class java.lang.Object

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

Method Detail

addFields

public static Bson addFields(Field<?>... fields)

Creates an $addFields pipeline stage

Parameters:

fields - the fields to add

Returns:

the $addFields pipeline stage

Since:

3.4

MongoDB documentation

$addFields

Since server release

3.4

addFields

public static Bson addFields(List<Field<?>> fields)

Creates an $addFields pipeline stage

Parameters:

fields - the fields to add

Returns:

the $addFields pipeline stage

Since:

3.4

MongoDB documentation

$addFields

Since server release

3.4

bucket

public static <TExpression,Boundary> Bson bucket(TExpression groupBy,
                                                 List<Boundary> boundaries)

Creates a $bucket pipeline stage

Type Parameters:

TExpression - the groupBy expression type

Boundary - the boundary type

Parameters:

groupBy - the criteria to group By

boundaries - the boundaries of the buckets

Returns:

the $bucket pipeline stage

Since:

3.4

MongoDB documentation

$bucket

Since server release

3.4

bucket

public static <TExpression,TBoundary> Bson bucket(TExpression groupBy,
                                                  List<TBoundary> boundaries,
                                                  BucketOptions options)

Creates a $bucket pipeline stage

Type Parameters:

TExpression - the groupBy expression type

TBoundary - the boundary type

Parameters:

groupBy - the criteria to group By

boundaries - the boundaries of the buckets

options - the optional values for the $bucket stage

Returns:

the $bucket pipeline stage

Since:

3.4

MongoDB documentation

$bucket

Since server release

3.4

bucketAuto

public static <TExpression> Bson bucketAuto(TExpression groupBy,
                                            int buckets)

Creates a $bucketAuto pipeline stage

Type Parameters:

TExpression - the groupBy expression type

Parameters:

groupBy - the criteria to group By

buckets - the number of the buckets

Returns:

the $bucketAuto pipeline stage

Since:

3.4

MongoDB documentation

$bucketAuto

Since server release

3.4

bucketAuto

public static <TExpression> Bson bucketAuto(TExpression groupBy,
                                            int buckets,
                                            BucketAutoOptions options)

Creates a $bucketAuto pipeline stage

Type Parameters:

TExpression - the groupBy expression type

Parameters:

groupBy - the criteria to group By

buckets - the number of the buckets

options - the optional values for the $bucketAuto stage

Returns:

the $bucketAuto pipeline stage

Since:

3.4

MongoDB documentation

$bucketAuto

Since server release

3.4

count

public static Bson count()

Creates a $count pipeline stage using the field name "count" to store the result

Returns:

the $count pipeline stage

Since:

3.4

MongoDB documentation

$count

Since server release

3.4

count

public static Bson count(String field)

Creates a $count pipeline stage using the named field to store the result

Parameters:

field - the field in which to store the count

Returns:

the $count pipeline stage

Since:

3.4

MongoDB documentation

$count

Since server release

3.4

match

public static Bson match(Bson filter)

Creates a $match pipeline stage for the specified filter

Parameters:

filter - the filter to match

Returns:

the $match pipeline stage

See Also:

Filters

MongoDB documentation

$match

project

public static Bson project(Bson projection)

Creates a $project pipeline stage for the specified projection

Parameters:

projection - the projection

Returns:

the $project pipeline stage

See Also:

Projections

MongoDB documentation

$project

sort

public static Bson sort(Bson sort)

Creates a $sort pipeline stage for the specified sort specification

Parameters:

sort - the sort specification

Returns:

the $sort pipeline stage

See Also:

Sorts

MongoDB documentation

$sort

sortByCount

public static <TExpression> Bson sortByCount(TExpression filter)

Creates a $sortByCount pipeline stage for the specified filter

Type Parameters:

TExpression - the expression type

Parameters:

filter - the filter specification

Returns:

the $sortByCount pipeline stage

Since:

3.4

MongoDB documentation

$sortByCount

Since server release

3.4

skip

public static Bson skip(int skip)

Creates a $skip pipeline stage

Parameters:

skip - the number of documents to skip

Returns:

the $skip pipeline stage

MongoDB documentation

$skip

limit

public static Bson limit(int limit)

Creates a $limit pipeline stage for the specified filter

Parameters:

limit - the limit

Returns:

the $limit pipeline stage

MongoDB documentation

$limit

lookup

public static Bson lookup(String from,
                          String localField,
                          String foreignField,
                          String as)

Creates a $lookup pipeline stage, joining the current collection with the one specified in from using equality match between the local field and the foreign field

Parameters:

from - the name of the collection in the same database to perform the join with.

localField - the field from the local collection to match values against.

foreignField - the field in the from collection to match values against.

as - the name of the new array field to add to the input documents.

Returns:

the $lookup pipeline stage

Since:

3.2

MongoDB documentation

$lookup

Since server release

3.2

lookup

public static Bson lookup(String from,
                          List<? extends Bson> pipeline,
                          String as)

Creates a $lookup pipeline stage, joining the current collection with the one specified in from using the given pipeline

Parameters:

from - the name of the collection in the same database to perform the join with.

pipeline - the pipeline to run on the joined collection.

as - the name of the new array field to add to the input documents.

Returns:

the $lookup pipeline stage

Since:

3.7

MongoDB documentation

$lookup

Since server release

3.6

lookup

public static Bson lookup(String from,
                          @Nullable
                          List<Variable<?>> let,
                          List<? extends Bson> pipeline,
                          String as)

Creates a $lookup pipeline stage, joining the current collection with the one specified in from using the given pipeline

Parameters:

from - the name of the collection in the same database to perform the join with.

let - the variables to use in the pipeline field stages.

pipeline - the pipeline to run on the joined collection.

as - the name of the new array field to add to the input documents.

Returns:

the $lookup pipeline stage

Since:

3.7

MongoDB documentation

$lookup

Since server release

3.6

facet

public static Bson facet(List<Facet> facets)

Creates a facet pipeline stage

Parameters:

facets - the facets to use

Returns:

the new pipeline stage

Since:

3.4

MongoDB documentation

$facet

Since server release

3.4

facet

public static Bson facet(Facet... facets)

Creates a facet pipeline stage

Parameters:

facets - the facets to use

Returns:

the new pipeline stage

Since:

3.4

MongoDB documentation

$facet

Since server release

3.4

graphLookup

public static <TExpression> Bson graphLookup(String from,
                                             TExpression startWith,
                                             String connectFromField,
                                             String connectToField,
                                             String as)

Creates a graphLookup pipeline stage for the specified filter

Type Parameters:

TExpression - the expression type

Parameters:

from - the collection to query

startWith - the expression to start the graph lookup with

connectFromField - the from field

connectToField - the to field

as - name of field in output document

Returns:

the $graphLookup pipeline stage

Since:

3.4

MongoDB documentation

$graphLookup

Since server release

3.4

graphLookup

public static <TExpression> Bson graphLookup(String from,
                                             TExpression startWith,
                                             String connectFromField,
                                             String connectToField,
                                             String as,
                                             GraphLookupOptions options)

Creates a graphLookup pipeline stage for the specified filter

Type Parameters:

TExpression - the expression type

Parameters:

from - the collection to query

startWith - the expression to start the graph lookup with

connectFromField - the from field

connectToField - the to field

as - name of field in output document

options - optional values for the graphLookup

Returns:

the $graphLookup pipeline stage

Since:

3.4

MongoDB documentation

$graphLookup

Since server release

3.4

group

public static <TExpression> Bson group(TExpression id,
                                       BsonField... fieldAccumulators)

Creates a $group pipeline stage for the specified filter

Type Parameters:

TExpression - the expression type

Parameters:

id - the id expression for the group

fieldAccumulators - zero or more field accumulator pairs

Returns:

the $group pipeline stage

MongoDB documentation

$group

Expressions

group

public static <TExpression> Bson group(TExpression id,
                                       List<BsonField> fieldAccumulators)

Creates a $group pipeline stage for the specified filter

Type Parameters:

TExpression - the expression type

Parameters:

id - the id expression for the group

fieldAccumulators - zero or more field accumulator pairs

Returns:

the $group pipeline stage

MongoDB documentation

$group

Expressions

unwind

public static Bson unwind(String fieldName)

Creates a $unwind pipeline stage for the specified field name, which must be prefixed by a '$' sign.

Parameters:

fieldName - the field name, prefixed by a '$' sign

Returns:

the $unwind pipeline stage

MongoDB documentation

$unwind

unwind

public static Bson unwind(String fieldName,
                          UnwindOptions unwindOptions)

Creates a $unwind pipeline stage for the specified field name, which must be prefixed by a '$' sign.

Parameters:

fieldName - the field name, prefixed by a '$' sign

unwindOptions - options for the unwind pipeline stage

Returns:

the $unwind pipeline stage

Since:

3.2

MongoDB documentation

$unwind

Since server release

3.2

out

public static Bson out(String collectionName)

Creates a $out pipeline stage for the specified filter

Parameters:

collectionName - the collection name

Returns:

the $out pipeline stage

MongoDB documentation

$out

Since server release

2.6

replaceRoot

public static <TExpression> Bson replaceRoot(TExpression value)

Creates a $replaceRoot pipeline stage

Type Parameters:

TExpression - the new root type

Parameters:

value - the new root value

Returns:

the $replaceRoot pipeline stage

Since:

3.4

MongoDB documentation

$replaceRoot

Since server release

3.4

sample

public static Bson sample(int size)

Creates a $sample pipeline stage with the specified sample size

Parameters:

size - the sample size

Returns:

the $sample pipeline stage

Since:

3.2

MongoDB documentation

$sample

Since server release

3.2