version2/src/java/iotcloud/Pair.java

   1 package iotcloud;
   2
   3 class Pair<A, B> {
   4         private A a;
   5         private B b;
   6         int hashCode = -1;
   7
   8         Pair(A a, B b) {
   9                 this.a = a;
  10                 this.b = b;
  11
  12                 hashCode = 23;
  13                 hashCode = hashCode * 31 + a.hashCode();
  14                 hashCode = hashCode * 31 + b.hashCode();
  15         }
  16
  17         A getFirst() {
  18                 return a;
  19         }
  20
  21         B getSecond() {
  22                 return b;
  23         }
  24
  25
  26         public int hashCode() {
  27                 return hashCode;
  28         }
  29
  30         public boolean equals(Object o) {
  31                 if (o instanceof Pair) {
  32                         Pair i = (Pair)o;
  33                         if (a.equals(i.getFirst()) && b.equals(i.getSecond())) {
  34                                 return true;
  35                         }
  36                 }
  37                 return false;
  38         }
  39
  40         public String toString() {
  41                 return "<" + a + "," + b + ">";
  42         }
  43 }