/*
* Copyright 2008-2016 the original author or authors.
*
* Licensed 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 com.nominanuda.zen.stereotype;
import javax.annotation.concurrent.Immutable;
/**
*
* not necessarily {@link Immutable}
*
*/
public interface Value extends Copyable {
@Override
int hashCode();
@Override
boolean equals(Object obj);
/**
*
* @param o1
* @param o2
* @return true if o1 and o2 are both null or o1.equals(o2)
*/
public static boolean nullSafeEquals(Object o1, Object o2) {
return o1 == null ? o2 == null : o1.equals(o2);
}
}