org.apache.flink.mock.Whitebox Maven / Gradle / Ivy
/*
* 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.flink.mock;
import java.lang.reflect.Field;
/**
* Copied from mockito.
*
* Original license:
* Copyright (c) 2007 Mockito contributors
* This program is made available under the terms of the MIT License.
*/
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 set 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 set value to 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;
}
}
}