spring TypeMappedAnnotations 源码
spring TypeMappedAnnotations 代码
文件路径：/spring-core/src/main/java/org/springframework/core/annotation/TypeMappedAnnotations.java
/*
* Copyright 2002-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.core.annotation;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.function.Consumer;
import java.util.function.Predicate;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import org.springframework.lang.Nullable;
/**
* {@link MergedAnnotations} implementation that searches for and adapts
* annotations and meta-annotations using {@link AnnotationTypeMappings}.
*
* @author Phillip Webb
* @author Sam Brannen
* @since 5.2
*/
final class TypeMappedAnnotations implements MergedAnnotations {
/**
* Shared instance that can be used when there are no annotations.
*/
static final MergedAnnotations NONE = new TypeMappedAnnotations(
null, new Annotation[0], RepeatableContainers.none(), AnnotationFilter.ALL);
@Nullable
private final Object source;
@Nullable
private final AnnotatedElement element;
@Nullable
private final SearchStrategy searchStrategy;
private final Predicate<Class<?>> searchEnclosingClass;
@Nullable
private final Annotation[] annotations;
private final RepeatableContainers repeatableContainers;
private final AnnotationFilter annotationFilter;
@Nullable
private volatile List<Aggregate> aggregates;
private TypeMappedAnnotations(AnnotatedElement element, SearchStrategy searchStrategy,
Predicate<Class<?>> searchEnclosingClass, RepeatableContainers repeatableContainers,
AnnotationFilter annotationFilter) {
this.source = element;
this.element = element;
this.searchStrategy = searchStrategy;
this.searchEnclosingClass = searchEnclosingClass;
this.annotations = null;
this.repeatableContainers = repeatableContainers;
this.annotationFilter = annotationFilter;
}
private TypeMappedAnnotations(@Nullable Object source, Annotation[] annotations,
RepeatableContainers repeatableContainers, AnnotationFilter annotationFilter) {
this.source = source;
this.element = null;
this.searchStrategy = null;
this.searchEnclosingClass = Search.never;
this.annotations = annotations;
this.repeatableContainers = repeatableContainers;
this.annotationFilter = annotationFilter;
}
@Override
public <A extends Annotation> boolean isPresent(Class<A> annotationType) {
if (this.annotationFilter.matches(annotationType)) {
return false;
}
return Boolean.TRUE.equals(scan(annotationType,
IsPresent.get(this.repeatableContainers, this.annotationFilter, false)));
}
@Override
public boolean isPresent(String annotationType) {
if (this.annotationFilter.matches(annotationType)) {
return false;
}
return Boolean.TRUE.equals(scan(annotationType,
IsPresent.get(this.repeatableContainers, this.annotationFilter, false)));
}
@Override
public <A extends Annotation> boolean isDirectlyPresent(Class<A> annotationType) {
if (this.annotationFilter.matches(annotationType)) {
return false;
}
return Boolean.TRUE.equals(scan(annotationType,
IsPresent.get(this.repeatableContainers, this.annotationFilter, true)));
}
@Override
public boolean isDirectlyPresent(String annotationType) {
if (this.annotationFilter.matches(annotationType)) {
return false;
}
return Boolean.TRUE.equals(scan(annotationType,
IsPresent.get(this.repeatableContainers, this.annotationFilter, true)));
}
@Override
public <A extends Annotation> MergedAnnotation<A> get(Class<A> annotationType) {
return get(annotationType, null, null);
}
@Override
public <A extends Annotation> MergedAnnotation<A> get(Class<A> annotationType,
@Nullable Predicate<? super MergedAnnotation<A>> predicate) {
return get(annotationType, predicate, null);
}
@Override
public <A extends Annotation> MergedAnnotation<A> get(Class<A> annotationType,
@Nullable Predicate<? super MergedAnnotation<A>> predicate,
@Nullable MergedAnnotationSelector<A> selector) {
if (this.annotationFilter.matches(annotationType)) {
return MergedAnnotation.missing();
}
MergedAnnotation<A> result = scan(annotationType,
new MergedAnnotationFinder<>(annotationType, predicate, selector));
return (result != null ? result : MergedAnnotation.missing());
}
@Override
public <A extends Annotation> MergedAnnotation<A> get(String annotationType) {
return get(annotationType, null, null);
}
@Override
public <A extends Annotation> MergedAnnotation<A> get(String annotationType,
@Nullable Predicate<? super MergedAnnotation<A>> predicate) {
return get(annotationType, predicate, null);
}
@Override
public <A extends Annotation> MergedAnnotation<A> get(String annotationType,
@Nullable Predicate<? super MergedAnnotation<A>> predicate,
@Nullable MergedAnnotationSelector<A> selector) {
if (this.annotationFilter.matches(annotationType)) {
return MergedAnnotation.missing();
}
MergedAnnotation<A> result = scan(annotationType,
new MergedAnnotationFinder<>(annotationType, predicate, selector));
return (result != null ? result : MergedAnnotation.missing());
}
@Override
public <A extends Annotation> Stream<MergedAnnotation<A>> stream(Class<A> annotationType) {
if (this.annotationFilter == AnnotationFilter.ALL) {
return Stream.empty();
}
return StreamSupport.stream(spliterator(annotationType), false);
}
@Override
public <A extends Annotation> Stream<MergedAnnotation<A>> stream(String annotationType) {
if (this.annotationFilter == AnnotationFilter.ALL) {
return Stream.empty();
}
return StreamSupport.stream(spliterator(annotationType), false);
}
@Override
public Stream<MergedAnnotation<Annotation>> stream() {
if (this.annotationFilter == AnnotationFilter.ALL) {
return Stream.empty();
}
return StreamSupport.stream(spliterator(), false);
}
@Override
public Iterator<MergedAnnotation<Annotation>> iterator() {
if (this.annotationFilter == AnnotationFilter.ALL) {
return Collections.emptyIterator();
}
return Spliterators.iterator(spliterator());
}
@Override
public Spliterator<MergedAnnotation<Annotation>> spliterator() {
if (this.annotationFilter == AnnotationFilter.ALL) {
return Spliterators.emptySpliterator();
}
return spliterator(null);
}
private <A extends Annotation> Spliterator<MergedAnnotation<A>> spliterator(@Nullable Object annotationType) {
return new AggregatesSpliterator<>(annotationType, getAggregates());
}
private List<Aggregate> getAggregates() {
List<Aggregate> aggregates = this.aggregates;
if (aggregates == null) {
aggregates = scan(this, new AggregatesCollector());
if (aggregates == null || aggregates.isEmpty()) {
aggregates = Collections.emptyList();
}
this.aggregates = aggregates;
}
return aggregates;
}
@Nullable
private <C, R> R scan(C criteria, AnnotationsProcessor<C, R> processor) {
if (this.annotations != null) {
R result = processor.doWithAnnotations(criteria, 0, this.source, this.annotations);
return processor.finish(result);
}
if (this.element != null && this.searchStrategy != null) {
return AnnotationsScanner.scan(criteria, this.element, this.searchStrategy,
this.searchEnclosingClass, processor);
}
return null;
}
static MergedAnnotations from(AnnotatedElement element, SearchStrategy searchStrategy,
Predicate<Class<?>> searchEnclosingClass, RepeatableContainers repeatableContainers,
AnnotationFilter annotationFilter) {
if (AnnotationsScanner.isKnownEmpty(element, searchStrategy, searchEnclosingClass)) {
return NONE;
}
return new TypeMappedAnnotations(element, searchStrategy, searchEnclosingClass, repeatableContainers, annotationFilter);
}
static MergedAnnotations from(@Nullable Object source, Annotation[] annotations,
RepeatableContainers repeatableContainers, AnnotationFilter annotationFilter) {
if (annotations.length == 0) {
return NONE;
}
return new TypeMappedAnnotations(source, annotations, repeatableContainers, annotationFilter);
}
private static boolean isMappingForType(AnnotationTypeMapping mapping,
AnnotationFilter annotationFilter, @Nullable Object requiredType) {
Class<? extends Annotation> actualType = mapping.getAnnotationType();
return (!annotationFilter.matches(actualType) &&
(requiredType == null || actualType == requiredType || actualType.getName().equals(requiredType)));
}
/**
* {@link AnnotationsProcessor} used to detect if an annotation is directly
* present or meta-present.
*/
private static final class IsPresent implements AnnotationsProcessor<Object, Boolean> {
/**
* Shared instances that save us needing to create a new processor for
* the common combinations.
*/
private static final IsPresent[] SHARED;
static {
SHARED = new IsPresent[4];
SHARED[0] = new IsPresent(RepeatableContainers.none(), AnnotationFilter.PLAIN, true);
SHARED[1] = new IsPresent(RepeatableContainers.none(), AnnotationFilter.PLAIN, false);
SHARED[2] = new IsPresent(RepeatableContainers.standardRepeatables(), AnnotationFilter.PLAIN, true);
SHARED[3] = new IsPresent(RepeatableContainers.standardRepeatables(), AnnotationFilter.PLAIN, false);
}
private final RepeatableContainers repeatableContainers;
private final AnnotationFilter annotationFilter;
private final boolean directOnly;
private IsPresent(RepeatableContainers repeatableContainers,
AnnotationFilter annotationFilter, boolean directOnly) {
this.repeatableContainers = repeatableContainers;
this.annotationFilter = annotationFilter;
this.directOnly = directOnly;
}
@Override
@Nullable
public Boolean doWithAnnotations(Object requiredType, int aggregateIndex,
@Nullable Object source, Annotation[] annotations) {
for (Annotation annotation : annotations) {
if (annotation != null) {
Class<? extends Annotation> type = annotation.annotationType();
if (type != null && !this.annotationFilter.matches(type)) {
if (type == requiredType || type.getName().equals(requiredType)) {
return Boolean.TRUE;
}
Annotation[] repeatedAnnotations =
this.repeatableContainers.findRepeatedAnnotations(annotation);
if (repeatedAnnotations != null) {
Boolean result = doWithAnnotations(
requiredType, aggregateIndex, source, repeatedAnnotations);
if (result != null) {
return result;
}
}
if (!this.directOnly) {
AnnotationTypeMappings mappings = AnnotationTypeMappings.forAnnotationType(type);
for (int i = 0; i < mappings.size(); i++) {
AnnotationTypeMapping mapping = mappings.get(i);
if (isMappingForType(mapping, this.annotationFilter, requiredType)) {
return Boolean.TRUE;
}
}
}
}
}
}
return null;
}
static IsPresent get(RepeatableContainers repeatableContainers,
AnnotationFilter annotationFilter, boolean directOnly) {
// Use a single shared instance for common combinations
if (annotationFilter == AnnotationFilter.PLAIN) {
if (repeatableContainers == RepeatableContainers.none()) {
return SHARED[directOnly ? 0 : 1];
}
if (repeatableContainers == RepeatableContainers.standardRepeatables()) {
return SHARED[directOnly ? 2 : 3];
}
}
return new IsPresent(repeatableContainers, annotationFilter, directOnly);
}
}
/**
* {@link AnnotationsProcessor} that finds a single {@link MergedAnnotation}.
*/
private class MergedAnnotationFinder<A extends Annotation>
implements AnnotationsProcessor<Object, MergedAnnotation<A>> {
private final Object requiredType;
@Nullable
private final Predicate<? super MergedAnnotation<A>> predicate;
private final MergedAnnotationSelector<A> selector;
@Nullable
private MergedAnnotation<A> result;
MergedAnnotationFinder(Object requiredType, @Nullable Predicate<? super MergedAnnotation<A>> predicate,
@Nullable MergedAnnotationSelector<A> selector) {
this.requiredType = requiredType;
this.predicate = predicate;
this.selector = (selector != null ? selector : MergedAnnotationSelectors.nearest());
}
@Override
@Nullable
public MergedAnnotation<A> doWithAggregate(Object context, int aggregateIndex) {
return this.result;
}
@Override
@Nullable
public MergedAnnotation<A> doWithAnnotations(Object type, int aggregateIndex,
@Nullable Object source, Annotation[] annotations) {
for (Annotation annotation : annotations) {
if (annotation != null && !annotationFilter.matches(annotation)) {
MergedAnnotation<A> result = process(type, aggregateIndex, source, annotation);
if (result != null) {
return result;
}
}
}
return null;
}
@Nullable
private MergedAnnotation<A> process(
Object type, int aggregateIndex, @Nullable Object source, Annotation annotation) {
Annotation[] repeatedAnnotations = repeatableContainers.findRepeatedAnnotations(annotation);
if (repeatedAnnotations != null) {
return doWithAnnotations(type, aggregateIndex, source, repeatedAnnotations);
}
AnnotationTypeMappings mappings = AnnotationTypeMappings.forAnnotationType(
annotation.annotationType(), repeatableContainers, annotationFilter);
for (int i = 0; i < mappings.size(); i++) {
AnnotationTypeMapping mapping = mappings.get(i);
if (isMappingForType(mapping, annotationFilter, this.requiredType)) {
MergedAnnotation<A> candidate = TypeMappedAnnotation.createIfPossible(
mapping, source, annotation, aggregateIndex, IntrospectionFailureLogger.INFO);
if (candidate != null && (this.predicate == null || this.predicate.test(candidate))) {
if (this.selector.isBestCandidate(candidate)) {
return candidate;
}
updateLastResult(candidate);
}
}
}
return null;
}
private void updateLastResult(MergedAnnotation<A> candidate) {
MergedAnnotation<A> lastResult = this.result;
this.result = (lastResult != null ? this.selector.select(lastResult, candidate) : candidate);
}
@Override
@Nullable
public MergedAnnotation<A> finish(@Nullable MergedAnnotation<A> result) {
return (result != null ? result : this.result);
}
}
/**
* {@link AnnotationsProcessor} that collects {@link Aggregate} instances.
*/
private class AggregatesCollector implements AnnotationsProcessor<Object, List<Aggregate>> {
private final List<Aggregate> aggregates = new ArrayList<>();
@Override
@Nullable
public List<Aggregate> doWithAnnotations(Object criteria, int aggregateIndex,
@Nullable Object source, Annotation[] annotations) {
this.aggregates.add(createAggregate(aggregateIndex, source, annotations));
return null;
}
private Aggregate createAggregate(int aggregateIndex, @Nullable Object source, Annotation[] annotations) {
List<Annotation> aggregateAnnotations = getAggregateAnnotations(annotations);
return new Aggregate(aggregateIndex, source, aggregateAnnotations);
}
private List<Annotation> getAggregateAnnotations(Annotation[] annotations) {
List<Annotation> result = new ArrayList<>(annotations.length);
addAggregateAnnotations(result, annotations);
return result;
}
private void addAggregateAnnotations(List<Annotation> aggregateAnnotations, Annotation[] annotations) {
for (Annotation annotation : annotations) {
if (annotation != null && !annotationFilter.matches(annotation)) {
Annotation[] repeatedAnnotations = repeatableContainers.findRepeatedAnnotations(annotation);
if (repeatedAnnotations != null) {
addAggregateAnnotations(aggregateAnnotations, repeatedAnnotations);
}
else {
aggregateAnnotations.add(annotation);
}
}
}
}
@Override
public List<Aggregate> finish(@Nullable List<Aggregate> processResult) {
return this.aggregates;
}
}
private static class Aggregate {
private final int aggregateIndex;
@Nullable
private final Object source;
private final List<Annotation> annotations;
private final AnnotationTypeMappings[] mappings;
Aggregate(int aggregateIndex, @Nullable Object source, List<Annotation> annotations) {
this.aggregateIndex = aggregateIndex;
this.source = source;
this.annotations = annotations;
this.mappings = new AnnotationTypeMappings[annotations.size()];
for (int i = 0; i < annotations.size(); i++) {
this.mappings[i] = AnnotationTypeMappings.forAnnotationType(annotations.get(i).annotationType());
}
}
int size() {
return this.annotations.size();
}
@Nullable
AnnotationTypeMapping getMapping(int annotationIndex, int mappingIndex) {
AnnotationTypeMappings mappings = getMappings(annotationIndex);
return (mappingIndex < mappings.size() ? mappings.get(mappingIndex) : null);
}
AnnotationTypeMappings getMappings(int annotationIndex) {
return this.mappings[annotationIndex];
}
@Nullable
<A extends Annotation> MergedAnnotation<A> createMergedAnnotationIfPossible(
int annotationIndex, int mappingIndex, IntrospectionFailureLogger logger) {
return TypeMappedAnnotation.createIfPossible(
this.mappings[annotationIndex].get(mappingIndex), this.source,
this.annotations.get(annotationIndex), this.aggregateIndex, logger);
}
}
/**
* {@link Spliterator} used to consume merged annotations from the
* aggregates in distance fist order.
*/
private class AggregatesSpliterator<A extends Annotation> implements Spliterator<MergedAnnotation<A>> {
@Nullable
private final Object requiredType;
private final List<Aggregate> aggregates;
private int aggregateCursor;
@Nullable
private int[] mappingCursors;
AggregatesSpliterator(@Nullable Object requiredType, List<Aggregate> aggregates) {
this.requiredType = requiredType;
this.aggregates = aggregates;
this.aggregateCursor = 0;
}
@Override
public boolean tryAdvance(Consumer<? super MergedAnnotation<A>> action) {
while (this.aggregateCursor < this.aggregates.size()) {
Aggregate aggregate = this.aggregates.get(this.aggregateCursor);
if (tryAdvance(aggregate, action)) {
return true;
}
this.aggregateCursor++;
this.mappingCursors = null;
}
return false;
}
private boolean tryAdvance(Aggregate aggregate, Consumer<? super MergedAnnotation<A>> action) {
if (this.mappingCursors == null) {
this.mappingCursors = new int[aggregate.size()];
}
int lowestDistance = Integer.MAX_VALUE;
int annotationResult = -1;
for (int annotationIndex = 0; annotationIndex < aggregate.size(); annotationIndex++) {
AnnotationTypeMapping mapping = getNextSuitableMapping(aggregate, annotationIndex);
if (mapping != null && mapping.getDistance() < lowestDistance) {
annotationResult = annotationIndex;
lowestDistance = mapping.getDistance();
}
if (lowestDistance == 0) {
break;
}
}
if (annotationResult != -1) {
MergedAnnotation<A> mergedAnnotation = aggregate.createMergedAnnotationIfPossible(
annotationResult, this.mappingCursors[annotationResult],
this.requiredType != null ? IntrospectionFailureLogger.INFO : IntrospectionFailureLogger.DEBUG);
this.mappingCursors[annotationResult]++;
if (mergedAnnotation == null) {
return tryAdvance(aggregate, action);
}
action.accept(mergedAnnotation);
return true;
}
return false;
}
@Nullable
private AnnotationTypeMapping getNextSuitableMapping(Aggregate aggregate, int annotationIndex) {
int[] cursors = this.mappingCursors;
if (cursors != null) {
AnnotationTypeMapping mapping;
do {
mapping = aggregate.getMapping(annotationIndex, cursors[annotationIndex]);
if (mapping != null && isMappingForType(mapping, annotationFilter, this.requiredType)) {
return mapping;
}
cursors[annotationIndex]++;
}
while (mapping != null);
}
return null;
}
@Override
@Nullable
public Spliterator<MergedAnnotation<A>> trySplit() {
return null;
}
@Override
public long estimateSize() {
int size = 0;
for (int aggregateIndex = this.aggregateCursor;
aggregateIndex < this.aggregates.size(); aggregateIndex++) {
Aggregate aggregate = this.aggregates.get(aggregateIndex);
for (int annotationIndex = 0; annotationIndex < aggregate.size(); annotationIndex++) {
AnnotationTypeMappings mappings = aggregate.getMappings(annotationIndex);
int numberOfMappings = mappings.size();
if (aggregateIndex == this.aggregateCursor && this.mappingCursors != null) {
numberOfMappings -= Math.min(this.mappingCursors[annotationIndex], mappings.size());
}
size += numberOfMappings;
}
}
return size;
}
@Override
public int characteristics() {
return NONNULL | IMMUTABLE;
}
}
}
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