@@ -0,0 +1,1387 @@
+/*%0A *  Licensed to the Apache Software Foundation (ASF) under one or more%0A *  contributor license agreements.  See the NOTICE file distributed with%0A *  this work for additional information regarding copyright ownership.%0A *  The ASF licenses this file to You under the Apache License, Version 2.0%0A *  (the %22License%22); you may not use this file except in compliance with%0A *  the License.  You may obtain a copy of the License at%0A *%0A *      http://www.apache.org/licenses/LICENSE-2.0%0A *%0A *  Unless required by applicable law or agreed to in writing, software%0A *  distributed under the License is distributed on an %22AS IS%22 BASIS,%0A *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A *  See the License for the specific language governing permissions and%0A *  limitations under the License.%0A *%0A */%0Apackage org.apache.ivy.util;%0A%0A/**%0A * Utility class used to perform some checks.%0A */%0Apublic class Checks %7B%0A%09/**%0A%09 * Checks that an object is not null, and throw an exception%0A%09 * if the object is null.%0A%09 * %0A%09 * @param o the object to check%0A%09 * @param objectName the name of the object to check. This name will be used in the exception message.%0A%09 * @throws IllegalArgumentException if the object is null%0A%09 */%0A%09public static void checkNotNull(Object o, String objectName) %7B%0A%09%09if (o == null) %7B%0A%09%09%09throw new IllegalArgumentException(objectName+%22 must not be null%22);%0A%09%09%7D%0A%09%7D%0A%0A%7D%0A

add a check utility class, which can be used to check for nullity consistently