/*
 * Copyright (C) 2013-2015 Daniel Dietsch (dietsch@informatik.uni-freiburg.de)
 * Copyright (C) 2015 University of Freiburg
 * 
 * This file is part of the ULTIMATE JUnit Helper Library.
 * 
 * The ULTIMATE JUnit Helper Library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * The ULTIMATE JUnit Helper Library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with the ULTIMATE JUnit Helper Library. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Additional permission under GNU GPL version 3 section 7:
 * If you modify the ULTIMATE JUnit Helper Library, or any covered work, by linking
 * or combining it with Eclipse RCP (or a modified version of Eclipse RCP), 
 * containing parts covered by the terms of the Eclipse Public License, the 
 * licensors of the ULTIMATE JUnit Helper Library grant you additional permission 
 * to convey the resulting work.
 */
package de.uni_freiburg.informatik.ultimate.test.junitextension;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class PrivateTester<T> {

	@SuppressWarnings("unchecked")
	public T call(Object instance, String methodName, Object... args) 
			throws PrivateInvocationException {
		
		final Class<?> cls = instance.getClass();
		Method method;
		Object ret;
		
		try {
			
			method = cls.getDeclaredMethod(methodName, cls);
			method.setAccessible(true); 
			ret = method.invoke(instance, args);

		} catch (final Exception e) {
			throw (PrivateInvocationException) 
				new PrivateInvocationException().initCause(e);
		}
		
		return (T)ret;
	}
	
	@SuppressWarnings("unchecked")
	public T getField(Object instance, String fieldName) 
			 throws PrivateInvocationException {
		
		final Class<?> cls = instance.getClass();
		Field field;
		Object ret;
		
		try {
			
			field = cls.getDeclaredField(fieldName);
			field.setAccessible(true);
			ret = field.get(instance);
			
		} catch (final Exception e) {
			throw (PrivateInvocationException)
				new PrivateInvocationException().initCause(e);
		}
		
		return (T) ret;
	}
	
}