Package org.hibernate.search.engine.search.projection.dsl.spi

Class AbstractSearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>,SC extends SearchProjectionIndexScope<?>,R,E>

java.lang.Object

org.hibernate.search.engine.search.projection.dsl.spi.AbstractSearchProjectionFactory<SR,S,SC,R,E>

All Implemented Interfaces:

ExtendedSearchProjectionFactory<SR,S,R,E>, SearchProjectionFactory<R,E>, TypedSearchProjectionFactory<SR,R,E>

public abstract class AbstractSearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>,SC extends SearchProjectionIndexScope<?>,R,E>
extends Object
implements ExtendedSearchProjectionFactory<SR,S,R,E>

Field Summary

Fields

Modifier and Type	Field	Description
protected final SearchProjectionDslContext<SC>	dslContext

Constructor Summary

Constructors

Constructor	Description
AbstractSearchProjectionFactory(SearchProjectionDslContext<SC> dslContext)

Method Summary

Modifier and Type	Method	Description
CompositeProjectionInnerStep	composite()	Starts the definition of a composite projection, which will combine multiple given projections.
CompositeProjectionValueStep<?,List<?>>	composite(SearchProjection<?>... projections)	Create a projection that will compose a List based on the given projections.
<T> ProjectionFinalStep<T>	constant(T value)	Project to a given constant.
DistanceToFieldProjectionValueStep<?,Double>	distance(String fieldPath, GeoPoint center)	Project on the distance from the center to a GeoPoint field.
DocumentReferenceProjectionOptionsStep<?>	documentReference()	Project the match to a DocumentReference.
EntityProjectionOptionsStep<?,E>	entity()	Project to the entity that was originally indexed.
<T> EntityProjectionOptionsStep<?,T>	entity(Class<T> requestedEntityType)	Project to the entity that was originally indexed.
EntityReferenceProjectionOptionsStep<?,R>	entityReference()	Project to a reference to the entity that was originally indexed.
<T> SearchProjectionFactoryExtensionIfSupportedStep<SR,T,R,E>	extension()	Create a DSL step allowing multiple attempts to apply extensions one after the other, failing only if none of the extensions is supported.
<T> T	extension(SearchProjectionFactoryExtension<T,R,E> extension)	Extend the current factory with the given extension, resulting in an extended factory offering different types of projections.
<T> FieldProjectionValueStep<?,T>	field(String fieldPath, Class<T> clazz, ValueModel valueModel)	Project to the value of a field in the indexed document.
FieldProjectionValueStep<?,Object>	field(String fieldPath, ValueModel valueModel)	Project to the value of a field in the indexed document, without specifying a type.
HighlightProjectionOptionsStep	highlight(String fieldPath)	Project to highlights, i.e. sequences of text that matched the query, extracted from the given field's value.
<I> IdProjectionOptionsStep<?,I>	id(Class<I> requestedIdentifierType)	Project to the identifier of the referenced entity, i.e. the value of the property marked as @DocumentId.
CompositeProjectionInnerStep	object(String objectFieldPath)	Starts the definition of an object projection, which will yield one value per object in a given object field, the value being the result of combining multiple given projections (usually on fields within the object field).
ScoreProjectionOptionsStep<?>	score()	Project on the score of the hit.
final String	toAbsolutePath(String relativeFieldPath)
<T> ProjectionFinalStep<T>	withParameters(Function<? super NamedValues,? extends ProjectionFinalStep<T>> projectionCreator)	Delegating projection that creates the actual projection at query create time and provides access to query parameters.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.hibernate.search.engine.search.projection.dsl.ExtendedSearchProjectionFactory

withRoot, withScopeRoot

Methods inherited from interface org.hibernate.search.engine.search.projection.dsl.SearchProjectionFactory

composite, composite, composite, composite, composite, composite, composite, composite, composite, field, field, field, field, id

Methods inherited from interface org.hibernate.search.engine.search.projection.dsl.TypedSearchProjectionFactory

distance, field, highlight, object

Field Details

dslContext

protected final SearchProjectionDslContext<SC extends SearchProjectionIndexScope<?>> dslContext

Constructor Details

AbstractSearchProjectionFactory

public AbstractSearchProjectionFactory(SearchProjectionDslContext<SC> dslContext)

Method Details

documentReference

public DocumentReferenceProjectionOptionsStep<?> documentReference()

Description copied from interface: SearchProjectionFactory

Project the match to a DocumentReference.

Specified by:

documentReference in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Returns:

A DSL step where the "document reference" projection can be defined in more details.

field

public <T> FieldProjectionValueStep<?,T> field(String fieldPath,
 Class<T> clazz,
 ValueModel valueModel)

Description copied from interface: SearchProjectionFactory

Project to the value of a field in the indexed document.

Specified by:

field in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Type Parameters:

T - The resulting type of the projection.

Parameters:

fieldPath - The path to the index field whose value will be extracted.

clazz - The resulting type of the projection.

valueModel - The model value, determines how the data fetched from the backend should be converted. See ValueModel.

Returns:

A DSL step where the "field" projection can be defined in more details.

field

public FieldProjectionValueStep<?,Object> field(String fieldPath,
 ValueModel valueModel)

Description copied from interface: SearchProjectionFactory

Project to the value of a field in the indexed document, without specifying a type.

Specified by:

field in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Parameters:

fieldPath - The path to the index field whose value will be extracted.

valueModel - The model value, determines how the data fetched from the backend should be converted. See ValueModel.

Returns:

A DSL step where the "field" projection can be defined in more details.

entityReference

public EntityReferenceProjectionOptionsStep<?,R> entityReference()

Description copied from interface: SearchProjectionFactory

Project to a reference to the entity that was originally indexed.

Entity references are instances of type EntityReference, but some mappers may expose a different type for backwards compatibility reasons. EntityReference should be favored wherever possible as mapper-specific types will eventually be removed.

Specified by:

entityReference in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Returns:

A DSL step where the "entity reference" projection can be defined in more details.

id

public <I> IdProjectionOptionsStep<?,I> id(Class<I> requestedIdentifierType)

Description copied from interface: SearchProjectionFactory

Project to the identifier of the referenced entity, i.e. the value of the property marked as @DocumentId.

Specified by:

id in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Type Parameters:

I - The requested type for returned identifiers.

Parameters:

requestedIdentifierType - The requested type for returned identifiers. Must be exactly the type of identifiers of the entity types targeted by the search, or a supertype.

Returns:

A DSL step where the "id" projection can be defined in more details.

entity

public EntityProjectionOptionsStep<?,E> entity()

Description copied from interface: SearchProjectionFactory

Project to the entity that was originally indexed.

The actual type of the entity depends on the mapper used to create the query and on the indexes targeted by your query: the Hibernate ORM mapper will return a managed entity loaded from the database, for example.

Specified by:

entity in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Returns:

A DSL step where the "entity" projection can be defined in more details.

entity

public <T> EntityProjectionOptionsStep<?,T> entity(Class<T> requestedEntityType)

Description copied from interface: SearchProjectionFactory

Project to the entity that was originally indexed.

The expected type will be checked against the actual type of the entity, which depends on the mapper used to create the query and on the indexes targeted by your query: the Hibernate ORM mapper will return a managed entity loaded from the database, for example.

Specified by:

entity in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Parameters:

requestedEntityType - The requested type for returned entities. Must be exactly the type of entities targeted by the search, or a supertype.

Returns:

A DSL step where the "entity" projection can be defined in more details.

score

public ScoreProjectionOptionsStep<?> score()

Description copied from interface: SearchProjectionFactory

Project on the score of the hit.

Specified by:

score in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Returns:

A DSL step where the "score" projection can be defined in more details.

distance

public DistanceToFieldProjectionValueStep<?,Double> distance(String fieldPath,
 GeoPoint center)

Description copied from interface: SearchProjectionFactory

Project on the distance from the center to a GeoPoint field.

Specified by:

distance in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Parameters:

fieldPath - The path to the index field containing the location to compute the distance from.

center - The center to compute the distance from.

Returns:

A DSL step where the "distance" projection can be defined in more details.

object

public CompositeProjectionInnerStep object(String objectFieldPath)

Description copied from interface: SearchProjectionFactory

Starts the definition of an object projection, which will yield one value per object in a given object field, the value being the result of combining multiple given projections (usually on fields within the object field).

Compared to the basic composite projection, an object projection is bound to a specific object field, and thus it yields zero, one or many values, as many as there are objects in the targeted object field. Therefore, you must take care of calling CompositeProjectionValueStep.collector(ProjectionCollector.Provider) if the object field is multi-valued.

Specified by:

object in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Parameters:

objectFieldPath - The path to the object field whose object(s) will be extracted.

Returns:

A DSL step where the "composite" projection can be defined in more details.

composite

public CompositeProjectionInnerStep composite()

Description copied from interface: SearchProjectionFactory

Starts the definition of a composite projection, which will combine multiple given projections.

On contrary to the object projection, a composite projection is not bound to a specific object field, and thus it will always yield one and only one value, regardless of whether CompositeProjectionValueStep.collector(ProjectionCollector.Provider) is called.

Specified by:

composite in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Returns:

A DSL step where the "composite" projection can be defined in more details.

composite

public CompositeProjectionValueStep<?,List<?>> composite(SearchProjection<?>... projections)

Description copied from interface: SearchProjectionFactory

Create a projection that will compose a List based on the given projections.

Specified by:

composite in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Parameters:

projections - The projections used to populate the list, in order.

Returns:

A DSL step where the "composite" projection can be defined in more details.

constant

public <T> ProjectionFinalStep<T> constant(T value)

Description copied from interface: SearchProjectionFactory

Project to a given constant.

The projection will return the same value for every single hit.

Specified by:

constant in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Parameters:

value - The constant value that the projection should return.

Returns:

A DSL step where the "entity reference" projection can be defined in more details.

withParameters

public <T> ProjectionFinalStep<T> withParameters(Function<? super NamedValues,? extends ProjectionFinalStep<T>> projectionCreator)

Description copied from interface: SearchProjectionFactory

Delegating projection that creates the actual projection at query create time and provides access to query parameters.

Which projection exactly to create is defined by a function passed to the arguments of this projection.

Specified by:

withParameters in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Parameters:

projectionCreator - The function creating an actual projection.

Returns:

A final DSL step in a parameterized projection definition.

extension

public <T> T extension(SearchProjectionFactoryExtension<T,R,E> extension)

Description copied from interface: SearchProjectionFactory

Extend the current factory with the given extension, resulting in an extended factory offering different types of projections.

Specified by:

extension in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Type Parameters:

T - The type of factory provided by the extension.

Parameters:

extension - The extension to the projection DSL.

Returns:

The extended factory.

extension

public <T>
SearchProjectionFactoryExtensionIfSupportedStep<SR,T,R,E> extension()

Description copied from interface: TypedSearchProjectionFactory

Create a DSL step allowing multiple attempts to apply extensions one after the other, failing only if none of the extensions is supported.

If you only need to apply a single extension and fail if it is not supported, use the simpler SearchProjectionFactory.extension(SearchProjectionFactoryExtension) method instead.

This method is generic, and you should set the generic type explicitly to the expected projected type, e.g. .<MyProjectedType>extension().

Specified by:

extension in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Specified by:

extension in interface TypedSearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>,SC extends SearchProjectionIndexScope<?>>

Type Parameters:

T - The expected projected type.

Returns:

A DSL step.

toAbsolutePath

public final String toAbsolutePath(String relativeFieldPath)

Specified by:

toAbsolutePath in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Parameters:

relativeFieldPath - The path to a field, relative to the root of this factory.

Returns:

The absolute path of the field, for use in native projections for example. Note the path is returned even if the field doesn't exist.

highlight

public HighlightProjectionOptionsStep highlight(String fieldPath)

Description copied from interface: SearchProjectionFactory

Project to highlights, i.e. sequences of text that matched the query, extracted from the given field's value.

Specified by:

highlight in interface SearchProjectionFactory<SR,S extends ExtendedSearchProjectionFactory<SR,S,R,E>>

Parameters:

fieldPath - The path to the index field whose highlights will be extracted.

Returns:

A DSL step where the "highlight" projection can be defined in more details.