package com.walker.infrastructure.utils;
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import java.lang.reflect.ParameterizedType;
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import java.lang.reflect.Type;
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public class GenericTypeUtils {
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/**
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* 返回给定对象的泛型类型，默认返回第一个泛型(可能存在多个)。
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* @param clazz
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* @return
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* @date 2022-11-16
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*/
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public static Class getSuperClassGenericType(Class clazz){
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return getSuperClassGenericType(clazz, 0);
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}
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public static Class getSuperClassGenericType(Class clazz, int index){
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Type genType = clazz.getGenericSuperclass();
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if (!(genType instanceof ParameterizedType)) {
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// log.warn(clazz.getSimpleName() + "'s superclass not ParameterizedType");
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return Object.class;
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}
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Type[] params = ((ParameterizedType)genType).getActualTypeArguments();
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if ((index >= params.length) || (index < 0)) {
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// log.warn("Index: " + index + ", Size of " + clazz.getSimpleName() + "'s Parameterized Type: " + params.length);
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return Object.class;
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}
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if (!(params[index] instanceof Class)) {
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// log.warn(clazz.getSimpleName() + " not set the actual class on superclass generic parameter");
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return Object.class;
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}
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return (Class)params[index];
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}
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}
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