com.tencent.matrix.javalib.util.ReflectUtil Maven / Gradle / Ivy

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/*
 * Tencent is pleased to support the open source community by making wechat-matrix available.
 * Copyright (C) 2018 THL A29 Limited, a Tencent company. All rights reserved.
 * Licensed under the BSD 3-Clause License (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://opensource.org/licenses/BSD-3-Clause
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.tencent.matrix.javalib.util;


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

/**
 * Created by caichongyang on 17/7/4.
 */

public final class ReflectUtil {
    public static Field getDeclaredFieldRecursive(Object clazz, String fieldName) throws NoSuchFieldException, ClassNotFoundException {
        Class realClazz = null;
        if (clazz instanceof String) {
            realClazz = Class.forName((String) clazz);
        } else if (clazz instanceof Class) {
            realClazz = (Class) clazz;
        } else {
            throw new IllegalArgumentException("Illegal clazz type: " + clazz.getClass());
        }
        Class currClazz = realClazz;
        while (true) {
            try {
                Field field = currClazz.getDeclaredField(fieldName);
                field.setAccessible(true);
                return field;
            } catch (NoSuchFieldException e) {
                if (currClazz.equals(Object.class)) {
                    throw e;
                }
                currClazz = currClazz.getSuperclass();
            }
        }
    }

    public static Method getDeclaredMethodRecursive(Object clazz, String methodName, Class... argTypes) throws NoSuchMethodException, ClassNotFoundException {
        Class realClazz = null;
        if (clazz instanceof String) {
            realClazz = Class.forName((String) clazz);
        } else if (clazz instanceof Class) {
            realClazz = (Class) clazz;
        } else {
            throw new IllegalArgumentException("Illegal clazz type: " + clazz.getClass());
        }
        Class currClazz = realClazz;
        while (true) {
            try {
                Method method = currClazz.getDeclaredMethod(methodName);
                method.setAccessible(true);
                return method;
            } catch (NoSuchMethodException e) {
                if (currClazz.equals(Object.class)) {
                    throw e;
                }
                currClazz = currClazz.getSuperclass();
            }
        }
    }

    private ReflectUtil() {
        throw new UnsupportedOperationException();
    }
}