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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 *
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* KIND, either express or implied. See the License for the *
* specific language governing permissions and limitations *
* under the License. *
****************************************************************/
package org.apache.james.mime4j.util;
/**
* A set of utility methods to help produce consistent
* {@link Object#equals equals} and {@link Object#hashCode hashCode} methods.
*/
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 strings are equal, ignoring case considerations.
*
* @param s1 first string to compare, may be {@code null}
* @param s2 second string to compare, may be {@code null}
* @return {@code true} if the objects are equal or both null
*/
public static boolean equalsIgnoreCase(final String s1, final String s2) {
return s1 == null ? s2 == null : s1.equalsIgnoreCase(s2);
}
}