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package uncle.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

/**
 * Created by hujianbo on 2018/1/18.
 */
public class ReflectionUtil {

    private static final Logger LOGGER = LoggerFactory.getLogger(ReflectionUtil.class);

    /**
     * 创建实例
     */
    public static Object newInstance(Class cls) {
        Object instance;
        try {
            instance = cls.newInstance();
        } catch (Exception e) {
            LOGGER.error("new instance failue", e);
            throw new RuntimeException(e);
        }
        return instance;
    }

    /**
     * 调用方法
     */
    public static Object invokeMethod(Object obj, Method method, Object... args) {
        Object result;
        method.setAccessible(true);
        try {
            result = method.invoke(obj, args);
        } catch (Exception e) {
            LOGGER.error("invoke method failure", e);
            throw new RuntimeException(e);
        }
        return result;
    }

    /**
     * 设置成员变量的值
     */
    public static void setField(Object obj, Field field, Object value) {

        try {
            field.setAccessible(true);
            field.set(obj, value);
        } catch (IllegalAccessException e) {
            LOGGER.error("set field failue", e);
            throw new RuntimeException(e);
        }
    }
}