PowerMockitoSpyAnnotationEngine.java

/*
 *   Copyright 2016 the original author or authors.
 *
 *   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.
 *
 */
package org.powermock.api.mockito.internal.configuration;

import org.mockito.Captor;
import org.mockito.Mock;
import org.mockito.Spy;
import org.mockito.exceptions.base.MockitoException;
import org.mockito.internal.configuration.SpyAnnotationEngine;
import org.powermock.api.mockito.PowerMockito;
import org.powermock.reflect.Whitebox;

import java.lang.reflect.Field;

/**
 * More or less a copy of the {@link SpyAnnotationEngine} but it uses
 * {@link PowerMockito#spy(Object)} instead.
 */
public class PowerMockitoSpyAnnotationEngine extends SpyAnnotationEngine {

	@SuppressWarnings("deprecation")
	@Override
	public void process(Class<?> context, Object testClass) {
		Field[] fields = context.getDeclaredFields();
		for (Field field : fields) {
			if (field.isAnnotationPresent(Spy.class)) {
				try {
					Whitebox.invokeMethod(this, Spy.class, field, new Class<?>[] { Mock.class,
							org.mockito.Mock.class, Captor.class });
				} catch (RuntimeException e) {
					throw e;
				} catch (Exception e1) {
					throw new RuntimeException(e1);
				}
				boolean wasAccessible = field.isAccessible();
				field.setAccessible(true);
				try {
					Object instance = field.get(testClass);
					if (instance == null) {
						throw new MockitoException("Cannot create a @Spy for '" + field.getName()
								+ "' field because the *instance* is missing\n" + "Example of correct usage of @Spy:\n"
								+ "   @Spy List mock = new LinkedList();\n");
					}
					field.set(testClass, PowerMockito.spy(instance));
				} catch (IllegalAccessException e) {
					throw new MockitoException("Problems initiating spied field " + field.getName(), e);
				} finally {
					field.setAccessible(wasAccessible);
				}
			}
		}
	}
}