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dc-invoke project for Spring Boot

There is a newer version: 0.5.4

package com.github.dc.invoke.util;

import lombok.experimental.UtilityClass;
import lombok.extern.slf4j.Slf4j;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

/**
 * @author Administrator
 */
@Slf4j
@UtilityClass
public class ReflectUtil {

    /**
     * 通过反射,获得定义Class时声明的父类的范型参数的类型.
     * 如public class EmployeeService extends DefaultService
     *
     * @param clazz clazz The class to introspect
     * @param index the Index of the generic ddeclaration,start from 0.
     */
    public static Class getSuperClassGenricType(Class clazz, int index) {
        Type genType = clazz.getGenericSuperclass();
        if (!(genType instanceof ParameterizedType)) {
            return Object.class;
        }
        Type[] params = ((ParameterizedType) genType).getActualTypeArguments();
        if (index >= params.length || index < 0) {
            return Object.class;
        }
        try {
            if (!(params[index] instanceof Class)) {
                return Object.class;
            }
        } catch (IndexOutOfBoundsException e) {
            return Object.class;
        }

        return (Class) params[index];
    }

    /**
     * 根据class实例化bean
     * @param eClass bean的class
     * @param  bean类型
     * @return bean
     */
    public static  E instance(Class eClass) {
        if (eClass == null) {
            return null;
        }

        E entity = null;
        try {
            entity = eClass.newInstance();
        } catch (InstantiationException | IllegalAccessException e) {
            log.warn("instance error:".concat(String.valueOf(eClass)), e);
        }

        return entity;
    }
}