/* * $HeadURL: https://svn.apache.org/repos/asf/jakarta/httpcomponents/oac.hc3x/tags/HTTPCLIENT_3_1/src/java/org/apache/commons/httpclient/util/LangUtils.java $ * $Revision: 480424 $ * $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $ * * ==================================================================== * *  Licensed to the Apache Software Foundation (ASF) under one or more *  contributor license agreements.  See the NOTICE file distributed with *  this work for additional information regarding copyright ownership. *  The ASF licenses this file to You under the Apache License, Version 2.0 *  (the "License"); you may not use this file except in compliance with *  the License.  You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * *  Unless required by applicable law or agreed to in writing, software *  distributed under the License 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. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation.  For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * */package org.apache.commons.httpclient.util;/** * A set of utility methods to help produce consistent Object#equals(Object) and * Object#hashCode methods. *   * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a> *  * @since 3.0 */public class LangUtils {        public static final int HASH_SEED = 17;    public static final int HASH_OFFSET = 37;        private LangUtils() {        super();    }    public static int hashCode(final int seed, final int hashcode) {        return seed * HASH_OFFSET + hashcode;    }    public static int hashCode(final int seed, final Object obj) {        return hashCode(seed, obj != null ? obj.hashCode() : 0);    }        public static int hashCode(final int seed, final boolean b) {        return hashCode(seed, b ? 1 : 0);    }        public static boolean equals(final Object obj1, final Object obj2) {        return obj1 == null ? obj2 == null : obj1.equals(obj2);    }}