Package com.mongodb.client.model.search

Interface SearchCollector

All Superinterfaces:

Bson

All Known Subinterfaces:

FacetSearchCollector

@Evolving
@Beta(CLIENT)
public interface SearchCollector
extends Bson

The core part of the $search pipeline stage of an aggregation pipeline. SearchCollectors allow returning metadata together with the search results. You may use the $$SEARCH_META variable, e.g., via Projections.computedSearchMeta(String), to extract this metadata.

Since:

4.7

MongoDB Atlas documentation

Search collectors

Field Summary

Fields inherited from interface org.bson.conversions.Bson

DEFAULT_CODEC_REGISTRY

Method Summary

Static Methods

Modifier and Type	Method	Description
static FacetSearchCollector	facet(SearchOperator operator, Iterable<? extends SearchFacet> facets)	Returns a SearchCollector that groups results by values or ranges in the specified faceted fields and returns the count for each of those groups.
static SearchCollector	of(Bson collector)	Creates a SearchCollector from a Bson in situations when there is no builder method that better satisfies your needs.

Methods inherited from interface org.bson.conversions.Bson

toBsonDocument, toBsonDocument

Method Details

facet

@Beta({CLIENT,SERVER})
static FacetSearchCollector facet(SearchOperator operator,
 Iterable<? extends SearchFacet> facets)

Returns a SearchCollector that groups results by values or ranges in the specified faceted fields and returns the count for each of those groups.

Parameters:

operator - The search operator to use.

facets - The non-empty facet definitions.

Returns:

The requested SearchCollector.

MongoDB Atlas documentation

facet collector

of

static SearchCollector of(Bson collector)

Creates a SearchCollector from a Bson in situations when there is no builder method that better satisfies your needs. This method cannot be used to validate the syntax.

Example
The following code creates two functionally equivalent SearchCollectors, though they may not be equal.

  SearchCollector collector1 = SearchCollector.facet(
          SearchOperator.exists(
                  SearchPath.fieldPath("fieldName")),
          Arrays.asList(
                  SearchFacet.stringFacet(
                          "stringFacetName",
                          SearchPath.fieldPath("stringFieldName")),
                  SearchFacet.numberFacet(
                          "numberFacetName",
                          SearchPath.fieldPath("numberFieldName"),
                          Arrays.asList(10, 20, 30))));
  SearchCollector collector2 = SearchCollector.of(new Document("facet",
          new Document("operator", SearchOperator.exists(
                  SearchPath.fieldPath("fieldName")))
                  .append("facets", SearchFacet.combineToBson(Arrays.asList(
                          SearchFacet.stringFacet(
                                  "stringFacetName",
                                  SearchPath.fieldPath("stringFieldName")),
                          SearchFacet.numberFacet(
                                  "numberFacetName",
                                  SearchPath.fieldPath("numberFieldName"),
                                  Arrays.asList(10, 20, 30)))))));
 

Parameters:

collector - A Bson representing the required SearchCollector.

Returns:

The requested SearchCollector.