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NestedRepeatableAnnotationsTests.java
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NestedRepeatableAnnotationsTests.java
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/*
* 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.ElementType;
import java.lang.annotation.Repeatable;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Method;
import java.util.Set;
import org.junit.jupiter.api.Nested;
import org.junit.jupiter.api.Test;
import org.springframework.core.annotation.MergedAnnotations.SearchStrategy;
import org.springframework.util.ReflectionUtils;
import static org.assertj.core.api.Assertions.assertThat;
/**
* Tests for various ways to search for repeatable annotations that are
* nested (i.e., repeatable annotations used as meta-annotations on other
* repeatable annotations).
*
* @author Sam Brannen
* @since 5.3.24
* @see https://github.com/spring-projects/spring-framework/issues/20279
*/
@SuppressWarnings("unused")
class NestedRepeatableAnnotationsTests {
@Nested
class SingleRepeatableAnnotationTests {
private final Method method = ReflectionUtils.findMethod(getClass(), "annotatedMethod");
@Test
void streamRepeatableAnnotations_MergedAnnotationsApi() {
Set<A> annotations = MergedAnnotations.from(method, SearchStrategy.TYPE_HIERARCHY)
.stream(A.class).collect(MergedAnnotationCollectors.toAnnotationSet());
// Merged, so we expect to find @A once with its value coming from @B(5).
assertThat(annotations).extracting(A::value).containsExactly(5);
}
@Test
void findMergedRepeatableAnnotations_AnnotatedElementUtils() {
Set<A> annotations = AnnotatedElementUtils.findMergedRepeatableAnnotations(method, A.class);
// Merged, so we expect to find @A once with its value coming from @B(5).
assertThat(annotations).extracting(A::value).containsExactly(5);
}
@Test
void getMergedRepeatableAnnotationsWithStandardRepeatables_AnnotatedElementUtils() {
Set<A> annotations = AnnotatedElementUtils.getMergedRepeatableAnnotations(method, A.class);
// Merged, so we expect to find @A once with its value coming from @B(5).
assertThat(annotations).extracting(A::value).containsExactly(5);
}
@Test
void getMergedRepeatableAnnotationsWithExplicitContainer_AnnotatedElementUtils() {
Set<A> annotations = AnnotatedElementUtils.getMergedRepeatableAnnotations(method, A.class, A.Container.class);
// Merged, so we expect to find @A once with its value coming from @B(5).
assertThat(annotations).extracting(A::value).containsExactly(5);
}
@Test
@SuppressWarnings("deprecation")
void getRepeatableAnnotations_AnnotationUtils() {
Set<A> annotations = AnnotationUtils.getRepeatableAnnotations(method, A.class);
// Not merged, so we expect to find @A once with the default value of 0.
// @A will actually be found twice, but we have Set semantics here.
assertThat(annotations).extracting(A::value).containsExactly(0);
}
@B(5)
void annotatedMethod() {
}
}
@Nested
class MultipleRepeatableAnnotationsTests {
private final Method method = ReflectionUtils.findMethod(getClass(), "annotatedMethod");
@Test
void streamRepeatableAnnotationsWithStandardRepeatables_MergedAnnotationsApi() {
RepeatableContainers repeatableContainers = RepeatableContainers.standardRepeatables();
Set<A> annotations = MergedAnnotations.from(method, SearchStrategy.TYPE_HIERARCHY, repeatableContainers)
.stream(A.class).collect(MergedAnnotationCollectors.toAnnotationSet());
// Merged, so we expect to find @A twice with values coming from @B(5) and @B(10).
assertThat(annotations).extracting(A::value).containsExactly(5, 10);
}
@Test
void streamRepeatableAnnotationsWithExplicitRepeatables_MergedAnnotationsApi() {
RepeatableContainers repeatableContainers =
RepeatableContainers.of(A.class, A.Container.class).and(B.Container.class, B.class);
Set<A> annotations = MergedAnnotations.from(method, SearchStrategy.TYPE_HIERARCHY, repeatableContainers)
.stream(A.class).collect(MergedAnnotationCollectors.toAnnotationSet());
// Merged, so we expect to find @A twice with values coming from @B(5) and @B(10).
assertThat(annotations).extracting(A::value).containsExactly(5, 10);
}
@Test
void findMergedRepeatableAnnotationsWithStandardRepeatables_AnnotatedElementUtils() {
Set<A> annotations = AnnotatedElementUtils.findMergedRepeatableAnnotations(method, A.class);
// Merged, so we expect to find @A twice with values coming from @B(5) and @B(10).
assertThat(annotations).extracting(A::value).containsExactly(5, 10);
}
@Test
void findMergedRepeatableAnnotationsWithExplicitContainer_AnnotatedElementUtils() {
Set<A> annotations = AnnotatedElementUtils.findMergedRepeatableAnnotations(method, A.class, A.Container.class);
// When findMergedRepeatableAnnotations(...) is invoked with an explicit container
// type, it uses RepeatableContainers.of(...) which limits the repeatable annotation
// support to a single container type.
//
// In this test case, we are therefore limiting the support to @A.Container, which
// means that @B.Container is unsupported and effectively ignored as a repeatable
// container type.
//
// Long story, short: the search doesn't find anything.
assertThat(annotations).isEmpty();
}
@Test
void getMergedRepeatableAnnotationsWithStandardRepeatables_AnnotatedElementUtils() {
Set<A> annotations = AnnotatedElementUtils.getMergedRepeatableAnnotations(method, A.class);
// Merged, so we expect to find @A twice with values coming from @B(5) and @B(10).
assertThat(annotations).extracting(A::value).containsExactly(5, 10);
}
@Test
void getMergedRepeatableAnnotationsWithExplicitContainer_AnnotatedElementUtils() {
Set<A> annotations = AnnotatedElementUtils.getMergedRepeatableAnnotations(method, A.class, A.Container.class);
// When getMergedRepeatableAnnotations(...) is invoked with an explicit container
// type, it uses RepeatableContainers.of(...) which limits the repeatable annotation
// support to a single container type.
//
// In this test case, we are therefore limiting the support to @A.Container, which
// means that @B.Container is unsupported and effectively ignored as a repeatable
// container type.
//
// Long story, short: the search doesn't find anything.
assertThat(annotations).isEmpty();
}
@Test
@SuppressWarnings("deprecation")
void getRepeatableAnnotations_AnnotationUtils() {
Set<A> annotations = AnnotationUtils.getRepeatableAnnotations(method, A.class);
// Not merged, so we expect to find a single @A with default value of 0.
// @A will actually be found twice, but we have Set semantics here.
assertThat(annotations).extracting(A::value).containsExactly(0);
}
@B(5)
@B(10)
void annotatedMethod() {
}
}
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.METHOD, ElementType.ANNOTATION_TYPE })
@Repeatable(A.Container.class)
public @interface A {
int value() default 0;
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.METHOD, ElementType.ANNOTATION_TYPE })
@interface Container {
A[] value();
}
}
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.METHOD, ElementType.ANNOTATION_TYPE })
@Repeatable(B.Container.class)
@A
@A
public @interface B {
@AliasFor(annotation = A.class)
int value();
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.METHOD, ElementType.ANNOTATION_TYPE })
@interface Container {
B[] value();
}
}
}