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/*
* ====================================================================
* 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 ch.boye.httpclientandroidlib.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.
* <p>
* <ul>
* <li>If both parameters are null, return {@code true}</li>
* <li>If one parameter is null, return {@code false}</li>
* <li>If the array lengths are different, return {@code false}</li>
* <li>Compare array elements using .equals(); return {@code false} if any comparisons fail.</li>
* <li>Return {@code true}</li>
* </ul>
*
* @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;
} else {
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;
} else {
return false;
}
}
}
}
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