hbase-common/src/main/java/org/apache/hadoop/hbase/util/Triple.java

   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.yetus.audience.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   // default constructor
  32   public Triple() {
  33
  34   }
  35
  36   public Triple(A first, B second, C third) {
  37     this.first = first;
  38     this.second = second;
  39     this.third = third;
  40   }
  41
  42   // ctor cannot infer types w/o warning but a method can.
  43   public static <A, B, C> Triple<A, B, C> create(A first, B second, C third) {
  44     return new Triple<>(first, second, third);
  45   }
  46
  47   @Override
  48   public int hashCode() {
  49     int hashFirst = (first != null ? first.hashCode() : 0);
  50     int hashSecond = (second != null ? second.hashCode() : 0);
  51     int hashThird = (third != null ? third.hashCode() : 0);
  52
  53     return (hashFirst >> 1) ^ hashSecond ^ (hashThird << 1);
  54   }
  55
  56   @Override
  57   public boolean equals(Object obj) {
  58     if (!(obj instanceof Triple)) {
  59       return false;
  60     }
  61
  62     Triple<?, ?, ?> otherTriple = (Triple<?, ?, ?>) obj;
  63
  64     if (first != otherTriple.first && (first != null && !(first.equals(otherTriple.first))))
  65       return false;
  66     if (second != otherTriple.second && (second != null && !(second.equals(otherTriple.second))))
  67       return false;
  68     if (third != otherTriple.third && (third != null && !(third.equals(otherTriple.third))))
  69       return false;
  70
  71     return true;
  72   }
  73
  74   @Override
  75   public String toString() {
  76     return "(" + first + ", " + second + "," + third + " )";
  77   }
  78
  79   public A getFirst() {
  80     return first;
  81   }
  82
  83   public void setFirst(A first) {
  84     this.first = first;
  85   }
  86
  87   public B getSecond() {
  88     return second;
  89   }
  90
  91   public void setSecond(B second) {
  92     this.second = second;
  93   }
  94
  95   public C getThird() {
  96     return third;
  97   }
  98
  99   public void setThird(C third) {
 100     this.third = third;
 101   }
 102 }