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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  package org.apache.hadoop.hbase.util;
20  
21  import org.apache.hadoop.classification.InterfaceAudience;
22  
23  /**
24   * Utility class to manage a triple.
25   */
26  @InterfaceAudience.Private
27  public class Triple<A, B, C> {
28    private A first;
29    private B second;
30    private C third;
31  
32    public Triple(A first, B second, C third) {
33      this.first = first;
34      this.second = second;
35      this.third = third;
36    }
37  
38    // ctor cannot infer types w/o warning but a method can.
39    public static <A, B, C> Triple<A, B, C> create(A first, B second, C third) {
40      return new Triple<A, B, C>(first, second, third);
41    }
42  
43    public int hashCode() {
44      int hashFirst = (first != null ? first.hashCode() : 0);
45      int hashSecond = (second != null ? second.hashCode() : 0);
46      int hashThird = (third != null ? third.hashCode() : 0);
47  
48      return (hashFirst >> 1) ^ hashSecond ^ (hashThird << 1);
49    }
50  
51    public boolean equals(Object obj) {
52      if (!(obj instanceof Triple)) {
53        return false;
54      }
55  
56      Triple<?, ?, ?> otherTriple = (Triple<?, ?, ?>) obj;
57  
58      if (first != otherTriple.first && (first != null && !(first.equals(otherTriple.first))))
59        return false;
60      if (second != otherTriple.second && (second != null && !(second.equals(otherTriple.second))))
61        return false;
62      if (third != otherTriple.third && (third != null && !(third.equals(otherTriple.third))))
63        return false;
64  
65      return true;
66    }
67  
68    public String toString() {
69      return "(" + first + ", " + second + "," + third + " )";
70    }
71  
72    public A getFirst() {
73      return first;
74    }
75  
76    public void setFirst(A first) {
77      this.first = first;
78    }
79  
80    public B getSecond() {
81      return second;
82    }
83  
84    public void setSecond(B second) {
85      this.second = second;
86    }
87  
88    public C getThird() {
89      return third;
90    }
91  
92    public void setThird(C third) {
93      this.third = third;
94    }
95  }
96  
97  
98