JoinSpec.Builder

public static final class JoinSpec.Builder
extends Object

java.lang.Object
   ↳ android.app.appsearch.JoinSpec.Builder


Builder for objects.

Summary

Public constructors

Builder(String childPropertyExpression)

Create a specification for the joining operation in search.

Public methods

JoinSpec build()

Constructs a new JoinSpec from the contents of this builder.

JoinSpec.Builder setAggregationScoringStrategy(int aggregationScoringStrategy)

Sets how we derive a single score from a list of joined documents.

JoinSpec.Builder setMaxJoinedResultCount(int maxJoinedResultCount)

Sets the max amount of SearchResults to return with the parent document, with a default of 10 SearchResults.

JoinSpec.Builder setNestedSearch(String nestedQuery, SearchSpec nestedSearchSpec)

Sets the query and the SearchSpec for the documents being joined.

Inherited methods

Public constructors

Builder

Added in API level 34
public Builder (String childPropertyExpression)

Create a specification for the joining operation in search.

The child property expressions Specifies how to join documents. Documents with a child property expression equal to the qualified id of the parent will be retrieved.

Property expressions differ from PropertyPath as property expressions may refer to document properties or nested document properties such as "person.business.id" as well as a property expression. Currently the only property expression is "this.qualifiedId()". PropertyPath objects may only reference document properties and nested document properties.

In order to join a child document to a parent document, the child document must contain the parent's qualified id at the property expression specified by this method.

Parameters
childPropertyExpression String: the property to match in the child documents. This value cannot be null.

Public methods

build

Added in API level 34
public JoinSpec build ()

Constructs a new JoinSpec from the contents of this builder.

Returns
JoinSpec This value cannot be null.

setAggregationScoringStrategy

Added in API level 34
public JoinSpec.Builder setAggregationScoringStrategy (int aggregationScoringStrategy)

Sets how we derive a single score from a list of joined documents.

The default scoring strategy is JoinSpec.AGGREGATION_SCORING_OUTER_RESULT_RANKING_SIGNAL, which specifies that the ranking signal of the outer parent document will be used.

Parameters
aggregationScoringStrategy int: Value is JoinSpec.AGGREGATION_SCORING_OUTER_RESULT_RANKING_SIGNAL, JoinSpec.AGGREGATION_SCORING_RESULT_COUNT, JoinSpec.AGGREGATION_SCORING_MIN_RANKING_SIGNAL, JoinSpec.AGGREGATION_SCORING_AVG_RANKING_SIGNAL, JoinSpec.AGGREGATION_SCORING_MAX_RANKING_SIGNAL, or JoinSpec.AGGREGATION_SCORING_SUM_RANKING_SIGNAL

Returns
JoinSpec.Builder This value cannot be null.

setMaxJoinedResultCount

Added in API level 34
public JoinSpec.Builder setMaxJoinedResultCount (int maxJoinedResultCount)

Sets the max amount of SearchResults to return with the parent document, with a default of 10 SearchResults.

This does NOT limit the number of results that are joined with the parent document for scoring. This means that, when set, only a maximum of maxJoinedResultCount results will be returned with each parent document, but all results that are joined with a parent will factor into the score.

Parameters
maxJoinedResultCount int

Returns
JoinSpec.Builder This value cannot be null.

setNestedSearch

Added in API level 34
public JoinSpec.Builder setNestedSearch (String nestedQuery, 
                SearchSpec nestedSearchSpec)

Sets the query and the SearchSpec for the documents being joined. This will score and rank the joined documents as well as filter the joined documents.

If SearchSpec#RANKING_STRATEGY_JOIN_AGGREGATE_SCORE is set in the outer SearchSpec, the resulting signals will be used to rank the parent documents. Note that the aggregation strategy also needs to be set with setAggregationScoringStrategy(int), otherwise the default will be JoinSpec.AGGREGATION_SCORING_OUTER_RESULT_RANKING_SIGNAL, which will just use the parent documents ranking signal.

If this method is never called, JoinSpec#getNestedQuery will return an empty string, meaning we will join with every possible document that matches the equality constraints and hasn't been filtered out by the type or namespace filters.

Parameters
nestedQuery String: This value cannot be null.

nestedSearchSpec SearchSpec: This value cannot be null.

Returns
JoinSpec.Builder This value cannot be null.