Class MergedAnnotationCollectors

java.lang.Object

org.springframework.core.annotation.MergedAnnotationCollectors

public abstract class MergedAnnotationCollectors
extends Object

Collector implementations that provide various reduction operations for MergedAnnotation instances.

Since:

5.2

Author:

Phillip Webb, Sam Brannen

Method Summary

Modifier and Type	Method	Description
static <A extends Annotation> Collector<MergedAnnotation<A>, ?, Annotation[]>	toAnnotationArray()	Create a new Collector that accumulates merged annotations to an Annotation array containing synthesized versions.
static <R extends Annotation, A extends R> Collector<MergedAnnotation<A>, ?, R[]>	toAnnotationArray(IntFunction<R[]> generator)	Create a new Collector that accumulates merged annotations to an Annotation array containing synthesized versions.
static <A extends Annotation> Collector<MergedAnnotation<A>, ?, Set<A>>	toAnnotationSet()	Create a new Collector that accumulates merged annotations to a LinkedHashSet containing synthesized versions.
static <A extends Annotation> Collector<MergedAnnotation<A>, ? extends @Nullable Object, @Nullable MultiValueMap<String, @Nullable Object>>	toMultiValueMap(Function<MultiValueMap<String, @Nullable Object>, @Nullable MultiValueMap<String, @Nullable Object>> finisher, MergedAnnotation.Adapt... adaptations)	Create a new Collector that accumulates merged annotations to a MultiValueMap with items added from each merged annotation as a map.
static <A extends Annotation> Collector<MergedAnnotation<A>, ? extends @Nullable Object, @Nullable MultiValueMap<String, @Nullable Object>>	toMultiValueMap(MergedAnnotation.Adapt... adaptations)	Create a new Collector that accumulates merged annotations to a MultiValueMap with items added from each merged annotation as a map.

Methods inherited from class Object

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

Method Details

toAnnotationSet

public static <A extends Annotation>
Collector<MergedAnnotation<A>, ?, Set<A>> toAnnotationSet()

Create a new Collector that accumulates merged annotations to a LinkedHashSet containing synthesized versions.

The collector returned by this method is effectively equivalent to Collectors.mapping(MergedAnnotation::synthesize, Collectors.toCollection(LinkedHashSet::new)) but avoids the creation of a composite collector.

Type Parameters:

A - the annotation type

Returns:

a Collector which collects and synthesizes the annotations into a Set

toAnnotationArray

public static <A extends Annotation>
Collector<MergedAnnotation<A>, ?, Annotation[]> toAnnotationArray()

Create a new Collector that accumulates merged annotations to an Annotation array containing synthesized versions.

Type Parameters:

A - the annotation type

Returns:

a Collector which collects and synthesizes the annotations into an Annotation[]

See Also:

• toAnnotationArray(IntFunction)

toAnnotationArray

public static <R extends Annotation, A extends R>
Collector<MergedAnnotation<A>, ?, R[]> toAnnotationArray(IntFunction<R[]> generator)

Create a new Collector that accumulates merged annotations to an Annotation array containing synthesized versions.

Type Parameters:

R - the resulting array type

A - the annotation type

Parameters:

generator - a function which produces a new array of the desired type and the provided length

Returns:

a Collector which collects and synthesizes the annotations into an annotation array

See Also:

• toAnnotationArray()

toMultiValueMap

public static <A extends Annotation>
Collector<MergedAnnotation<A>, ? extends @Nullable Object, @Nullable MultiValueMap<String, @Nullable Object>> toMultiValueMap(MergedAnnotation.Adapt... adaptations)

Create a new Collector that accumulates merged annotations to a MultiValueMap with items added from each merged annotation as a map.

Type Parameters:

A - the annotation type

Parameters:

adaptations - the adaptations that should be applied to the annotation values

Returns:

a Collector which collects and synthesizes the annotations into a LinkedMultiValueMap

See Also:

• toMultiValueMap(Function, MergedAnnotation.Adapt...)

toMultiValueMap

public static <A extends Annotation>
Collector<MergedAnnotation<A>, ? extends @Nullable Object, @Nullable MultiValueMap<String, @Nullable Object>> toMultiValueMap(Function<MultiValueMap<String, @Nullable Object>, @Nullable MultiValueMap<String, @Nullable Object>> finisher,
 MergedAnnotation.Adapt... adaptations)

Create a new Collector that accumulates merged annotations to a MultiValueMap with items added from each merged annotation as a map.

Type Parameters:

A - the annotation type

Parameters:

finisher - the finisher function for the new MultiValueMap

adaptations - the adaptations that should be applied to the annotation values

Returns:

a Collector which collects and synthesizes the annotations into a LinkedMultiValueMap

See Also:

• toMultiValueMap(MergedAnnotation.Adapt...)