| /** |
| * 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 com.datatorrent.lib.util; |
| |
| import java.util.Map; |
| |
| /** |
| * Unlike {@link KeyValPair} this computes hashcode based on just the key and not the value.<br/> |
| * Key and Value are to be treated as immutable objects. |
| * |
| * @since 0.9.0 |
| */ |
| public class KeyHashValPair<K, V> extends KeyValPair<K, V> |
| { |
| |
| private static final long serialVersionUID = 7005592007894368002L; |
| |
| public KeyHashValPair(K k, V v) |
| { |
| super(k, v); |
| } |
| |
| private KeyHashValPair() |
| { |
| super(null, null); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return (getKey() == null ? 0 : getKey().hashCode()); |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (!(o instanceof Map.Entry)) { |
| return false; |
| } |
| Map.Entry e = (Map.Entry)o; |
| return (this.getKey() == null ? e.getKey() == null : this.getKey().equals(e.getKey())); |
| } |
| |
| } |