/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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 org.apache.skywalking.apm.agent.test.helper;

import java.lang.reflect.Field;

public class FieldGetter {
    @SuppressWarnings("TypeParameterUnusedInFormals")
    public static <T> T getValue(Object instance,
        String fieldName) throws IllegalAccessException, NoSuchFieldException {
        Field field = instance.getClass().getDeclaredField(fieldName);
        field.setAccessible(true);
        return (T) field.get(instance);
    }

    @SuppressWarnings("TypeParameterUnusedInFormals")
    public static <T> T getParentFieldValue(Object instance,
        String fieldName) throws IllegalAccessException, NoSuchFieldException {
        Field field = instance.getClass().getSuperclass().getDeclaredField(fieldName);
        field.setAccessible(true);
        return (T) field.get(instance);
    }

    @SuppressWarnings("TypeParameterUnusedInFormals")
    public static <T> T get2LevelParentFieldValue(Object instance,
        String fieldName) throws IllegalAccessException, NoSuchFieldException {
        Field field = instance.getClass().getSuperclass().getSuperclass().getDeclaredField(fieldName);
        field.setAccessible(true);
        return (T) field.get(instance);
    }
}
