001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017package org.apache.logging.log4j.core.util;
018
019import java.util.Objects;
020
021/**
022 * Utility class providing common validation logic.
023 */
024public final class Assert {
025    private Assert() {
026    }
027
028    public static int valueIsAtLeast(final int value, final int minValue) {
029        if (value < minValue) {
030            throw new IllegalArgumentException("Value should be at least " + minValue + " but was " + value);
031        }
032        return value;
033    }
034
035    /**
036     * Throws a {@code NullPointerException} if the specified parameter is
037     * {@code null}, otherwise returns the specified parameter.
038     * <p>
039     * On Java 7, just use {@code Objects.requireNonNull(T, String)}
040     * </p>
041     * <p>
042     * Usage:
043     * </p>
044     * <pre>
045     * // earlier you would write this:
046     * public SomeConstructor(Object param) {
047     *     if (param == null) {
048     *         throw new NullPointerException(&quot;param&quot;);
049     *     }
050     *     this.field = param;
051     * }
052     *
053     * // now you can do the same in one line:
054     * public SomeConstructor(Object param) {
055     *     this.field = Assert.requireNonNull(&quot;param&quot;);
056     * }
057     * </pre>
058     *
059     * @param <T> the type of the parameter to check and return
060     * @param object the parameter to check
061     * @param message message to populate the NPE with if necessary
062     * @return the specified parameter
063     * @throws NullPointerException if {@code object} is {@code null}
064     * @deprecated Will be removed in 2.5.
065     */
066    @Deprecated
067    public static <T> T requireNonNull(final T object, final String message) {
068        return Objects.requireNonNull(object, message);
069    }
070}