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AnnotationAwareOrderComparatorTests.java
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AnnotationAwareOrderComparatorTests.java
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/*
* Copyright 2002-2019 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.util.ArrayList;
import java.util.List;
import javax.annotation.Priority;
import org.junit.Test;
import static org.assertj.core.api.Assertions.assertThat;
/**
* @author Juergen Hoeller
* @author Oliver Gierke
*/
public class AnnotationAwareOrderComparatorTests {
@Test
public void instanceVariableIsAnAnnotationAwareOrderComparator() {
assertThat(AnnotationAwareOrderComparator.INSTANCE).isInstanceOf(AnnotationAwareOrderComparator.class);
}
@Test
public void sortInstances() {
List<Object> list = new ArrayList<>();
list.add(new B());
list.add(new A());
AnnotationAwareOrderComparator.sort(list);
assertThat(list.get(0) instanceof A).isTrue();
assertThat(list.get(1) instanceof B).isTrue();
}
@Test
public void sortInstancesWithPriority() {
List<Object> list = new ArrayList<>();
list.add(new B2());
list.add(new A2());
AnnotationAwareOrderComparator.sort(list);
assertThat(list.get(0) instanceof A2).isTrue();
assertThat(list.get(1) instanceof B2).isTrue();
}
@Test
public void sortInstancesWithOrderAndPriority() {
List<Object> list = new ArrayList<>();
list.add(new B());
list.add(new A2());
AnnotationAwareOrderComparator.sort(list);
assertThat(list.get(0) instanceof A2).isTrue();
assertThat(list.get(1) instanceof B).isTrue();
}
@Test
public void sortInstancesWithSubclass() {
List<Object> list = new ArrayList<>();
list.add(new B());
list.add(new C());
AnnotationAwareOrderComparator.sort(list);
assertThat(list.get(0) instanceof C).isTrue();
assertThat(list.get(1) instanceof B).isTrue();
}
@Test
public void sortClasses() {
List<Object> list = new ArrayList<>();
list.add(B.class);
list.add(A.class);
AnnotationAwareOrderComparator.sort(list);
assertThat(list.get(0)).isEqualTo(A.class);
assertThat(list.get(1)).isEqualTo(B.class);
}
@Test
public void sortClassesWithSubclass() {
List<Object> list = new ArrayList<>();
list.add(B.class);
list.add(C.class);
AnnotationAwareOrderComparator.sort(list);
assertThat(list.get(0)).isEqualTo(C.class);
assertThat(list.get(1)).isEqualTo(B.class);
}
@Test
public void sortWithNulls() {
List<Object> list = new ArrayList<>();
list.add(null);
list.add(B.class);
list.add(null);
list.add(A.class);
AnnotationAwareOrderComparator.sort(list);
assertThat(list.get(0)).isEqualTo(A.class);
assertThat(list.get(1)).isEqualTo(B.class);
assertThat(list.get(2)).isNull();
assertThat(list.get(3)).isNull();
}
@Order(1)
private static class A {
}
@Order(2)
private static class B {
}
private static class C extends A {
}
@Priority(1)
private static class A2 {
}
@Priority(2)
private static class B2 {
}
}