TestHelpers.java

/**
 * Copyright 2008 The University of North Carolina at Chapel Hill
 *
 * 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 edu.unc.lib.dl.test;

import java.lang.reflect.Field;

/**
 * Helper methods for test classes.
 *
 * @author bbpennel
 * @date Mar 21, 2014
 */
public class TestHelpers {

	/**
	 * Set a field on object parent to the given object using reflection. This allows setting of injected fields
	 *
	 * Copyright 2013 DuraSpace, Inc.
	 *
	 * http://www.apache.org/licenses/LICENSE-2.0
	 * 
	 * @param parent
	 * @param name
	 * @param obj
	 */
	public static void setField(final Object parent, final String name, final Object obj) {
		/* check the parent class too if the field could not be found */
		try {
			final Field f = findField(parent.getClass(), name);
			f.setAccessible(true);
			f.set(parent, obj);
		} catch (final Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * Locates the field on the given class or any of its super classes.
	 *
	 * @param clazz
	 * @param name
	 * @return
	 * @throws NoSuchFieldException
	 */
	private static Field findField(final Class<?> clazz, final String name) throws NoSuchFieldException {
		for (final Field f : clazz.getDeclaredFields()) {
			if (f.getName().equals(name)) {
				return f;
			}
		}
		if (clazz.getSuperclass() == null) {
			throw new NoSuchFieldException("Field " + name + " could not be found");
		}
		return findField(clazz.getSuperclass(), name);
	}
}