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package com.taobao.hsf.lightapi.util;

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

/**
 * Created by huangsheng.hs on 2014/11/30.
 */
public class ReflectionUtil {
    /**
     * @param instance
     * @param methodName
     * @return
     * @throws Exception
     */
    public static Object invoke(Object instance, String methodName)
            throws Exception {
        Method method = instance.getClass().getMethod(methodName);
        method.setAccessible(true);
        return method.invoke(instance, null);
    }

    /**
     * @param instance
     * @param methodName
     * @param params
     * @return
     * @throws Exception
     */
    public static Object invoke(Object instance, String methodName, Object... params)
            throws Exception {
        Class[] paramTypes = new Class[params.length];
        for (int i = 0; i < params.length; i++) {
            paramTypes[i] = params[i].getClass();
        }
        Method method = instance.getClass().getDeclaredMethod(methodName, paramTypes);
        method.setAccessible(true);
        Class returnType = method.getReturnType();
        if (returnType == null) {// returnType instanceof Void
            method.invoke(instance, params);
        }
        return method.invoke(instance, params);
    }

    /**
     * @param clazz
     * @param methodName
     * @param params
     * @return
     * @throws Exception
     */
    public static Object staticInvoke(Class clazz, String methodName, Object... params)
            throws Exception {
        Class[] paramTypes = new Class[params.length];
        for (int i = 0; i < params.length; i++) {
            paramTypes[i] = params[i].getClass();
        }
        Method method = clazz.getDeclaredMethod(methodName, paramTypes);
        method.setAccessible(true);
        return method.invoke(null, params);
    }

    /**
     * @param clazz
     * @param methodName
     * @return
     * @throws Exception
     */
    public static Object staticInvoke(Class clazz, String methodName)
            throws Exception {
        Method method = clazz.getDeclaredMethod(methodName);
        method.setAccessible(true);
        return method.invoke(null, null);
    }

    /**
     * @param instance
     * @param fieldName
     * @return
     * @throws Exception
     */
    public static Object getField(Object instance, String fieldName) throws Exception {
        Class clazz = instance.getClass();
        Field field = clazz.getDeclaredField(fieldName);
        field.setAccessible(true);
        return field.get(instance);
    }

    /**
     * @param clazz
     * @param fieldName
     * @return
     * @throws Exception
     */
    public static Object getStaticField(Class clazz, String fieldName) throws Exception {
        Field field = clazz.getDeclaredField(fieldName);
        field.setAccessible(true);
        return field.get(null);
    }
}