Assert.java

/*
 * The CroudTrip! application aims at revolutionizing the car-ride-sharing market with its easy,
 * user-friendly and highly automated way of organizing shared Trips. Copyright (C) 2015  Nazeeh Ammari,
 *  Philipp Eichhorn, Ricarda Hohn, Vanessa Lange, Alexander Popp, Frederik Simon, Michael Weber
 * This program is free software: you can redistribute it and/or modify  it under the terms of the GNU
 *  Affero General Public License as published by the Free Software Foundation, either version 3 of the
 *   License, or (at your option) any later version.
 *  This program 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 Affero General Public License for more details.
 *  You should have received a copy of the GNU Affero General Public License along with this program.
 *    If not, see http://www.gnu.org/licenses/.
 */

package org.croudtrip.utils;


import java.util.List;

public class Assert {

	private Assert() { }


	public static void assertNotNull(Object... objects) {
		for (Object o : objects) {
			if (o == null) throw new NullPointerException("param is null");
		}
	}


	public static void assertTrue(boolean expression) {
		assertTrue(expression, "expression is false");
	}


	public static void assertTrue(boolean expression, String errorMsg) {
		assertFalse(!expression, errorMsg);
	}


	public static void assertFalse(boolean expression, String errorMsg) {
		if (expression) throw new IllegalArgumentException(errorMsg);
	}


	public static void assertEquals(Object o1, Object o2, String errorMsg) {
		if (o1 == null && o2 == null) return;
		if (o1 == null || o2 == null) throw new IllegalArgumentException(errorMsg);
		if (!o1.equals(o2)) throw new IllegalArgumentException(errorMsg);
	}


	public static void assertValidIdx(List<?> list, int idx) {
		if (idx < 0 || idx >= list.size())
			throw new IndexOutOfBoundsException("idx was " + idx + " but size is " + list.size());
	}

}