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add AnnotationProxy
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@ -6,6 +6,7 @@
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### 🐣新特性
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* 【http 】 HttpRequest.form采用TableMap方式(issue#I4W427@gitee)
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* 【core 】 AnnotationUtil增加getAnnotationAlias方法(pr#554@gitee)
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### 🐞Bug修复
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* 【core 】 修复ObjectUtil.hasNull传入null返回true的问题(pr#555@gitee)
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@ -0,0 +1,88 @@
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package cn.hutool.core.annotation;
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import cn.hutool.core.util.ReflectUtil;
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import cn.hutool.core.util.StrUtil;
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import java.io.Serializable;
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import java.lang.annotation.Annotation;
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import java.lang.reflect.InvocationHandler;
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import java.lang.reflect.Method;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* 注解代理<br>
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* 通过代理指定注解,可以自定义调用注解的方法逻辑,如支持{@link Alias} 注解
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*
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* @param <T> 注解类型
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* @since 5.7.23
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*/
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public class AnnotationProxy<T extends Annotation> implements Annotation, InvocationHandler, Serializable {
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private static final long serialVersionUID = 1L;
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private final T annotation;
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private final Class<T> type;
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private final Map<String, Object> attributes;
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/**
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* 构造
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*
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* @param annotation 注解
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*/
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public AnnotationProxy(T annotation) {
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this.annotation = annotation;
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//noinspection unchecked
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this.type = (Class<T>) annotation.annotationType();
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this.attributes = initAttributes();
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}
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@Override
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public Class<? extends Annotation> annotationType() {
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return null;
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}
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@Override
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public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
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// 注解别名
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Alias alias = method.getAnnotation(Alias.class);
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if(null != alias){
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final String name = alias.value();
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if(StrUtil.isNotBlank(name)){
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if(false == attributes.containsKey(name)){
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throw new IllegalArgumentException(StrUtil.format("No method for alias: [{}]", name));
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}
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return attributes.get(name);
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}
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}
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final Object value = attributes.get(method.getName());
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if (value != null) {
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return value;
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}
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return method.invoke(this, args);
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}
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/**
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* 初始化注解的属性<br>
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* 此方法预先调用所有注解的方法,将注解方法值缓存于attributes中
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*
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* @return 属性(方法结果)映射
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*/
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private Map<String, Object> initAttributes() {
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final Method[] methods = ReflectUtil.getMethods(this.type);
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final Map<String, Object> attributes = new HashMap<>(methods.length, 1);
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for (Method method : methods) {
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// 跳过匿名内部类自动生成的方法
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if (method.isSynthetic()) {
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continue;
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}
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attributes.put(method.getName(), ReflectUtil.invoke(this.annotation, method));
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}
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return attributes;
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}
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}
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@ -2,11 +2,15 @@ package cn.hutool.core.annotation;
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import cn.hutool.core.exceptions.UtilException;
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import cn.hutool.core.util.ArrayUtil;
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import cn.hutool.core.util.ObjectUtil;
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import cn.hutool.core.util.ReflectUtil;
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import cn.hutool.core.util.StrUtil;
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import java.lang.annotation.*;
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import java.lang.annotation.Annotation;
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import java.lang.annotation.Documented;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Inherited;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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import java.lang.reflect.AnnotatedElement;
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import java.lang.reflect.Method;
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import java.lang.reflect.Proxy;
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@ -38,7 +42,7 @@ public class AnnotationUtil {
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/**
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* 获取指定注解
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*
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* @param annotationEle {@link AnnotatedElement},可以是Class、Method、Field、Constructor、ReflectPermission
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* @param annotationEle {@link AnnotatedElement},可以是Class、Method、Field、Constructor、ReflectPermission
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* @param isToCombination 是否为转换为组合注解
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* @return 注解对象
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*/
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@ -201,9 +205,9 @@ public class AnnotationUtil {
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/**
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* 设置新的注解的属性(字段)值
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*
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* @param annotation 注解对象
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* @param annotation 注解对象
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* @param annotationField 注解属性(字段)名称
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* @param value 要更新的属性值
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* @param value 要更新的属性值
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* @since 5.5.2
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*/
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@SuppressWarnings({"rawtypes", "unchecked"})
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@ -219,18 +223,11 @@ public class AnnotationUtil {
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* @param annotationType 注解类型Class
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* @param <T> 注解类型
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* @return 别名支持后的注解
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* @since 5.7.23
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*/
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@SuppressWarnings("unchecked")
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public static <T extends Annotation> T getAnnotationAlias(AnnotatedElement annotationEle, Class<T> annotationType) {
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T annotation = getAnnotation(annotationEle, annotationType);
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Object o = Proxy.newProxyInstance(annotationType.getClassLoader(), new Class[]{annotationType}, (proxy, method, args) -> {
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Alias alias = method.getAnnotation(Alias.class);
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if (ObjectUtil.isNotNull(alias) && StrUtil.isNotBlank(alias.value())) {
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Method aliasMethod = annotationType.getMethod(alias.value());
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return ReflectUtil.invoke(annotation, aliasMethod);
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}
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return method.invoke(args);
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});
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return (T) o;
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final T annotation = getAnnotation(annotationEle, annotationType);
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return (T) Proxy.newProxyInstance(annotationType.getClassLoader(), new Class[]{annotationType}, new AnnotationProxy<>(annotation));
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}
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}
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@ -386,7 +386,8 @@ public class ReflectUtil {
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}
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/**
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* 获得指定类过滤后的Public方法列表
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* 获得指定类过滤后的Public方法列表<br>
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* TODO 6.x此方法更改返回Method[]
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*
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* @param clazz 查找方法的类
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* @param filter 过滤器
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