com.feilong.lib.org.apache.http.util.LangUtils Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of feilong Show documentation

feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.

There is a newer version: 4.3.0

Show newest version

/*
 * ====================================================================
 * 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
 * .
 *
 */

package com.feilong.lib.org.apache.http.util;

/**
 * A set of utility methods to help produce consistent
 * {@link Object#equals equals} and {@link Object#hashCode hashCode} methods.
 *
 *
 * @since 4.0
 */
public final class LangUtils{

    public static final int HASH_SEED   = 17;

    public static final int HASH_OFFSET = 37;

    /** Disabled default constructor. */
    private LangUtils(){
    }

    public static int hashCode(final int seed,final int hashcode){
        return seed * HASH_OFFSET + hashcode;
    }

    public static int hashCode(final int seed,final boolean b){
        return hashCode(seed, b ? 1 : 0);
    }

    public static int hashCode(final int seed,final Object obj){
        return hashCode(seed, obj != null ? obj.hashCode() : 0);
    }

    /**
     * Check if two objects are equal.
     *
     * @param obj1
     *            first object to compare, may be {@code null}
     * @param obj2
     *            second object to compare, may be {@code null}
     * @return {@code true} if the objects are equal or both null
     */
    public static boolean equals(final Object obj1,final Object obj2){
        return obj1 == null ? obj2 == null : obj1.equals(obj2);
    }

    /**
     * Check if two object arrays are equal.
     * 
     * If both parameters are null, return {@code true}
     * If one parameter is null, return {@code false}
     * If the array lengths are different, return {@code false}
     * Compare array elements using .equals(); return {@code false} if any comparisons fail.
     * Return {@code true}
     * 
     *
     * @param a1
     *            first array to compare, may be {@code null}
     * @param a2
     *            second array to compare, may be {@code null}
     * @return {@code true} if the arrays are equal or both null
     */
    public static boolean equals(final Object[] a1,final Object[] a2){
        if (a1 == null){
            return a2 == null;
        }
        if (a2 != null && a1.length == a2.length){
            for (int i = 0; i < a1.length; i++){
                if (!equals(a1[i], a2[i])){
                    return false;
                }
            }
            return true;
        }
        return false;
    }

}