/*-
 * ============LICENSE_START=======================================================
 * ONAP : APPC
 * ================================================================================
 * Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Copyright (c) 2007 Mockito contributors
 * =============================================================================
 * Licensed 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.
 *
 * ============LICENSE_END=========================================================
 */

package org.onap.appc.provider;

import java.lang.reflect.Field;

public class  Whitebox {
    public static Object getInternalState(Object target, String field) {
        Class<?> c = target.getClass();
        try {
            Field f = getFieldFromHierarchy(c, field);
            f.setAccessible(true);
            return f.get(target);
        } catch (Exception e) {
            throw new RuntimeException("Unable to get internal state on a private field. Please report to mockito mailing list.", e);
        }
    }

    public static void  setInternalState(Object target, String field, Object value) {
        Class<?> c = target.getClass();
        try {
            Field f = getFieldFromHierarchy(c, field);
            f.setAccessible(true);
            f.set(target, value);
        } catch (Exception e) {
            throw new RuntimeException("Unable to set internal state on a private field. Please report to mockito mailing list.", e);
        }
    }

    private static Field  getFieldFromHierarchy(Class<?> clazz, String field) {
        Field f = getField(clazz, field);
        while (f == null && clazz != Object.class) {
            clazz = clazz.getSuperclass();
            f = getField(clazz, field);
        }
        if (f == null) {
            throw new RuntimeException(
                    "You want me to get this field: '" + field +
                    "' on this class: '" + clazz.getSimpleName() + 
                    "' but this field is not declared withing hierarchy of this class!");
        }
        return f;
    }

    private static Field  getField(Class<?> clazz, String field) {
        try {
            return clazz.getDeclaredField(field);
        } catch (NoSuchFieldException e) {
            return null;
        }
    }
}