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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2015-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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 com.amazonaws.util;

/**
 * Useful utilities to validate dependencies
 */
public class ValidationUtils {

    /**
     * Asserts that the given object is non-null and returns it.
     *
     * @param object
     *         Object to assert on
     * @param fieldName
     *         Field name to display in exception message if null
     * @return Object if non null
     * @throws IllegalArgumentException
     *         If object was null
     */
    public static  T assertNotNull(T object, String fieldName) throws IllegalArgumentException {
        if (object == null) {
            throw new IllegalArgumentException(String.format("%s cannot be null", fieldName));
        }
        return object;
    }

    /**
     * Asserts that all of the objects are null.
     *
     * @throws IllegalArgumentException
     *         if any object provided was NOT null.
     */
    public static void assertAllAreNull(String messageIfNull, Object... objects) throws IllegalArgumentException {
        for (Object object : objects) {
            if (object != null) {
                throw new IllegalArgumentException(messageIfNull);
            }
        }
    }
}