io.micronaut.inject.annotation.AbstractAnnotationMetadata Maven / Gradle / Ivy
/*
* Copyright 2017-2020 original 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 io.micronaut.inject.annotation;
import io.micronaut.core.annotation.AnnotationMetadata;
import io.micronaut.core.annotation.AnnotationUtil;
import io.micronaut.core.annotation.AnnotationValue;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.reflect.ClassUtils;
import io.micronaut.core.util.ArgumentUtils;
import io.micronaut.core.util.CollectionUtils;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.core.annotation.Nullable;
import java.lang.annotation.Annotation;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import static io.micronaut.core.annotation.AnnotationUtil.ZERO_ANNOTATIONS;
/**
* Abstract implementation of the {@link AnnotationMetadata} interface.
*
* @author Graeme Rocher
* @since 1.0
*/
@Internal
abstract class AbstractAnnotationMetadata implements AnnotationMetadata {
private volatile Map annotationMap;
private volatile Map declaredAnnotationMap;
private volatile Annotation[] allAnnotationArray;
private volatile Annotation[] declaredAnnotationArray;
/**
* Constructs a default metadata.
*/
protected AbstractAnnotationMetadata() {
}
private Map getAnnotationMap() {
Map map = annotationMap;
if (map == null) {
synchronized (this) { // double check
map = annotationMap;
if (map == null) {
annotationMap = new ConcurrentHashMap<>();
return annotationMap;
}
}
}
return annotationMap;
}
private Map getDeclaredAnnotationMap() {
Map map = declaredAnnotationMap;
if (map == null) {
synchronized (this) { // double check
map = declaredAnnotationMap;
if (map == null) {
declaredAnnotationMap = new ConcurrentHashMap<>();
return declaredAnnotationMap;
}
}
}
return declaredAnnotationMap;
}
@SuppressWarnings("unchecked")
@Override
public @Nullable T synthesize(@NonNull Class annotationClass) {
ArgumentUtils.requireNonNull("annotationClass", annotationClass);
if (hasAnnotation(annotationClass) || hasStereotype(annotationClass)) {
String annotationName = annotationClass.getName();
return (T) getAnnotationMap().computeIfAbsent(annotationName, s -> {
final AnnotationValue annotationValue = findAnnotation(annotationClass).orElse(null);
return AnnotationMetadataSupport.buildAnnotation(annotationClass, annotationValue);
});
}
return null;
}
@SuppressWarnings("unchecked")
@Nullable
@Override
public T synthesize(@NonNull Class annotationClass, @NonNull String sourceAnnotation) {
ArgumentUtils.requireNonNull("annotationClass", annotationClass);
ArgumentUtils.requireNonNull("sourceAnnotation", sourceAnnotation);
if (hasAnnotation(sourceAnnotation) || hasStereotype(sourceAnnotation)) {
String annotationName = annotationClass.getName();
return (T) getAnnotationMap().computeIfAbsent(annotationName, s -> {
final AnnotationValue annotationValue = (AnnotationValue) findAnnotation(sourceAnnotation).orElse(null);
return AnnotationMetadataSupport.buildAnnotation(annotationClass, annotationValue);
});
}
return null;
}
@SuppressWarnings("unchecked")
@Nullable
@Override
public T synthesizeDeclared(@NonNull Class annotationClass, @NonNull String sourceAnnotation) {
ArgumentUtils.requireNonNull("annotationClass", annotationClass);
ArgumentUtils.requireNonNull("sourceAnnotation", sourceAnnotation);
String annotationName = annotationClass.getName();
if (hasDeclaredAnnotation(sourceAnnotation) || hasDeclaredStereotype(sourceAnnotation)) {
return (T) getDeclaredAnnotationMap().computeIfAbsent(annotationName, s -> {
final AnnotationValue annotationValue = (AnnotationValue) findDeclaredAnnotation(sourceAnnotation).orElse(null);
return AnnotationMetadataSupport.buildAnnotation(annotationClass, annotationValue);
});
}
return null;
}
@SuppressWarnings("unchecked")
@Override
public @Nullable T synthesizeDeclared(@NonNull Class annotationClass) {
ArgumentUtils.requireNonNull("annotationClass", annotationClass);
String annotationName = annotationClass.getName();
if (hasDeclaredAnnotation(annotationName) || hasDeclaredStereotype(annotationName)) {
return (T) getDeclaredAnnotationMap().computeIfAbsent(annotationName, s -> {
final AnnotationValue annotationValue = findDeclaredAnnotation(annotationClass).orElse(null);
return AnnotationMetadataSupport.buildAnnotation(annotationClass, annotationValue);
});
}
return null;
}
@Override
public @NonNull Annotation[] synthesizeAll() {
Annotation[] annotations = this.allAnnotationArray;
if (annotations == null) {
synchronized (this) { // double check
annotations = this.allAnnotationArray;
if (annotations == null) {
annotations = initializeAnnotations(getAnnotationNames());
this.allAnnotationArray = annotations;
}
}
}
return annotations;
}
@Override
public @NonNull Annotation[] synthesizeDeclared() {
Annotation[] annotations = this.declaredAnnotationArray;
if (annotations == null) {
synchronized (this) { // double check
annotations = this.declaredAnnotationArray;
if (annotations == null) {
annotations = initializeAnnotations(getDeclaredAnnotationNames());
this.declaredAnnotationArray = annotations;
}
}
}
return annotations;
}
private Annotation[] initializeAnnotations(Set names) {
if (CollectionUtils.isEmpty(names)) {
return AnnotationUtil.ZERO_ANNOTATIONS;
}
List annotations = new ArrayList<>(names.size());
for (String name : names) {
@SuppressWarnings("unchecked")
Class aClass = (Class) ClassUtils.forName(name, getClass().getClassLoader()).orElse(null);
if (aClass != null) {
Annotation ann = synthesize(aClass);
if (ann != null) {
annotations.add(ann);
}
}
}
return annotations.toArray(ZERO_ANNOTATIONS);
}
}