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fixed 7dbc9e9 from https://gitee.com/yixi-dlmu/hutool/pulls/603

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新增可获取重复性注解方法
This commit is contained in:
李鸿达 2022-04-26 17:35:43 +08:00 committed by Topcoder2023
parent d3f7fdcdd5
commit 562e77e438
3 changed files with 68 additions and 7 deletions
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51
hutool-core/src/main/java/cn/hutool/core/annotation/AnnotationUtil.java
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@ -4,18 +4,14 @@ import cn.hutool.core.exceptions.UtilException;
import cn.hutool.core.util.ArrayUtil;
import cn.hutool.core.util.ReflectUtil;
import java.lang.annotation.Annotation;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.annotation.*;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* 注解工具类<br>
@ -50,6 +46,47 @@ public class AnnotationUtil {
return (null == annotationEle) ? null : (isToCombination ? toCombination(annotationEle) : annotationEle).getAnnotations();
}
/**
* 获取可重复的注解列表
* 用于带有同一个注解的多个组合注解
*
* @param annotationEle {@link AnnotatedElement}，可以是Class、Method、Field、Constructor、ReflectPermission
* @param annotationType 注解类型
* @return 注解列表
* @param <T> 注解值类型
*/
public static <T> Set<T> getRepeatedAnnotations(AnnotatedElement annotationEle, Class<T> annotationType) {
if (!Annotation.class.isAssignableFrom(annotationType)){
return null;
}
Set<T> annotationList = new HashSet<>();
recursion(annotationList, annotationEle.getAnnotations(), annotationType);
return annotationList;
}
/**
* 递归获取注解列表
*
* @param list 注解结果集
* @param annotations 注解参数集
* @param annotationType 注解类型
* @param <T> 注解值类型
*/
private static <T> void recursion(Set<T> list, Annotation[] annotations, Class<T> annotationType) {
for (Annotation annotation : annotations) {
Class<? extends Annotation> clazz = annotation.getClass();
if (annotationType.isAssignableFrom(clazz)) {
list.add((T) annotation);
} else if (!Retention.class.isAssignableFrom(clazz)
&& !Target.class.isAssignableFrom(clazz)
&& !Documented.class.isAssignableFrom(clazz)
&& !Repeatable.class.isAssignableFrom(clazz)
&& !Inherited.class.isAssignableFrom(clazz)) {
recursion(list, annotation.annotationType().getAnnotations(), annotationType);
}
}
}
/**
* 获取指定注解
*

8
hutool-core/src/test/java/cn/hutool/core/annotation/AnnotationUtilTest.java
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@ -3,7 +3,14 @@ package cn.hutool.core.annotation;
import org.junit.Assert;
import org.junit.Test;
import java.util.Set;
public class AnnotationUtilTest {
@Test
public void getRepeatAnnotationValueTest(){
Set<AnnotationForTest> annotations = AnnotationUtil.getRepeatedAnnotations(ClassWithAnnotation.class, AnnotationForTest.class);
Assert.assertTrue(annotations != null && annotations.size() == 2);
}
@Test
public void getAnnotationValueTest() {
@ -23,6 +30,7 @@ public class AnnotationUtilTest {
}
@AnnotationForTest("测试")
@RepeatAnnotationForTest
static class ClassWithAnnotation{
public void test(){

16
hutool-core/src/test/java/cn/hutool/core/annotation/RepeatAnnotationForTest.java Normal file
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@ -0,0 +1,16 @@
package cn.hutool.core.annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* @author hongda.li 2022-04-26 17:09
*/
@AnnotationForTest("repeat-annotation")
@Retention(RetentionPolicy.RUNTIME)
// Target注解决定MyAnnotation注解可以加在哪些成分上，如加在类身上，或者属性身上，或者方法身上等成分
@Target({ ElementType.METHOD, ElementType.TYPE })
public @interface RepeatAnnotationForTest {
}