| /* |
| * 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.geode.cache.query.internal; |
| |
| import java.io.Serializable; |
| |
| /** |
| * This interface defines a Hashing strategy for keys(OR values) in a HashMap(OR HashSet) for |
| * calculation of hash-code for custom objects and primitive types. |
| * |
| * @since GemFire 8.0 |
| * |
| */ |
| public interface HashingStrategy extends Serializable { |
| |
| /** |
| * Computes a hash code for the specified object. Implementors can use the object's own |
| * <tt>hashCode</tt> method, the Java runtime's <tt>identityHashCode</tt>, or a custom scheme. |
| * |
| * @param o object for which the hash-code is to be computed |
| * @return the hashCode |
| */ |
| int hashCode(Object o); |
| |
| /** |
| * Compares o1 and o2 for equality. Strategy implementors may use the objects' own equals() |
| * methods, compare object references, or implement some custom scheme. |
| * |
| * @param o1 an <code>Object</code> value |
| * @param o2 an <code>Object</code> value |
| * @return true if the objects are equal according to this strategy. |
| */ |
| boolean equals(Object o1, Object o2); |
| } |