| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.hadoop.hdds.scm; |
| |
| import java.lang.reflect.Field; |
| |
| |
| /** |
| * This class includes some functions copied from Mockito's |
| * Whitebox class for portability reasons. |
| * |
| * Whitebox methods are accessed differently in different |
| * versions of Hadoop. Specifically the availability of the class |
| * changed from Apache Hadoop 3.1.0 to Hadoop 3.2.0. |
| * |
| * Duplicating the test code is ugly but it allows building |
| * HDDS portably. |
| */ |
| public final class HddsWhiteboxTestUtils { |
| |
| /** |
| * Private constructor to disallow construction. |
| */ |
| private HddsWhiteboxTestUtils() { |
| } |
| |
| /** |
| * Get the field of the target object. |
| * @param target target object |
| * @param field field name |
| * @return the field of the object |
| */ |
| 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.", e); |
| } |
| } |
| |
| /** |
| * Set the field of the target object. |
| * @param target target object |
| * @param field field name |
| * @param value value to set |
| */ |
| 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.", 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 within hierarchy " + |
| "of this class!"); |
| } |
| return f; |
| } |
| |
| private static Field getField(Class<?> clazz, String field) { |
| try { |
| return clazz.getDeclaredField(field); |
| } catch (NoSuchFieldException e) { |
| return null; |
| } |
| } |
| } |