| /* |
| * 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. |
| * |
| */ |
| package org.apache.ahc.util; |
| |
| /** |
| * A set of utility methods to help produce consistent Object#equals(Object) and |
| * Object#hashCode methods. |
| * |
| * @author oleg at ural.ru Oleg Kalnichevski |
| */ |
| public final class LangUtils { |
| |
| /** The Constant HASH_SEED. */ |
| public static final int HASH_SEED = 17; |
| |
| /** The Constant HASH_OFFSET. */ |
| public static final int HASH_OFFSET = 37; |
| |
| /** |
| * Instantiates a new LangUtils object. |
| */ |
| private LangUtils() { |
| super(); |
| } |
| |
| /** |
| * Hash code. |
| * |
| * @param seed the seed |
| * @param hashcode the hashcode |
| * |
| * @return the calculated hash value |
| */ |
| public static int hashCode(final int seed, final int hashcode) { |
| return seed * HASH_OFFSET + hashcode; |
| } |
| |
| /** |
| * Hash code. |
| * |
| * @param seed the seed |
| * @param obj the obj |
| * |
| * @return the calculated hash value |
| */ |
| public static int hashCode(final int seed, final Object obj) { |
| return hashCode(seed, obj != null ? obj.hashCode() : 0); |
| } |
| |
| /** |
| * Hash code. |
| * |
| * @param seed the seed |
| * @param b the b |
| * |
| * @return the calculated hash value |
| */ |
| public static int hashCode(final int seed, final boolean b) { |
| return hashCode(seed, b ? 1 : 0); |
| } |
| |
| /** |
| * Equals. |
| * |
| * @param obj1 the obj1 |
| * @param obj2 the obj2 |
| * |
| * @return true, if the objects equal |
| */ |
| public static boolean equals(final Object obj1, final Object obj2) { |
| return obj1 == null ? obj2 == null : obj1.equals(obj2); |
| } |
| |
| } |
| |