platform/util/src/com/intellij/openapi/util/Pair.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.openapi.util;
  17
  18 import java.util.Arrays;
  19
  20
  21 /**
  22  *
  23  */
  24 public class Pair<A, B> {
  25   public final A first;
  26   public final B second;
  27
  28   public Pair(A first, B second) {
  29     this.first = first;
  30     this.second = second;
  31   }
  32
  33   public final A getFirst() {
  34     return first;
  35   }
  36
  37   public final B getSecond() {
  38     return second;
  39   }
  40
  41   public static <A, B> Pair<A, B> create(A first, B second) {
  42     return new Pair<A,B>(first, second);
  43   }
  44
  45   public final boolean equals(Object o){
  46     return o instanceof Pair && Comparing.equal(first, ((Pair)o).first) && Comparing.equal(second, ((Pair)o).second);
  47   }
  48
  49   public final int hashCode(){
  50     int hashCode = 0;
  51     if (first != null){
  52       hashCode += hashCode(first);
  53     }
  54     if (second != null){
  55       hashCode += hashCode(second);
  56     }
  57     return hashCode;
  58   }
  59
  60   private static int hashCode(final Object o) {
  61     return (o instanceof Object[]) ? Arrays.hashCode((Object[])o) : o.hashCode();
  62   }
  63
  64   public String toString() {
  65     return "<" + first + "," + second + ">";
  66   }
  67 }