Pair


1   package jfun.parsec;
2   
3   import jfun.util.Misc;
4   
5   /**
6    * This is a simple Java Bean for a pair of objects.
7    * <p>
8    * @author Ben Yu
9    * Apr 24, 2006 1:41:52 PM
10   * @param <A>
11   * @param <B>
12   * @since version 1.1
13   */
14  public class Pair<A, B> {
15    private A value1;
16    private B value2;
17    public Pair(){}
18    /**
19     * To create a Pair object.
20     * @param a the first object.
21     * @param b the second object.
22     */
23    public Pair(A a, B b) {
24      this.value1 = a;
25      this.value2 = b;
26    }
27    /**
28     * Get the first value.
29     */
30    public A getValue1() {
31      return value1;
32    }
33    /**
34     * Set the first value.
35     */
36    public void setValue1(A value1) {
37      this.value1 = value1;
38    }
39    /**
40     * Get the second value.
41     */
42    public B getValue2() {
43      return value2;
44    }
45    /**
46     * Set the second value.
47     */
48    public void setValue2(B value2) {
49      this.value2 = value2;
50    }
51    public boolean equals(Pair other){
52      return Misc.equals(value1, other.value1) && Misc.equals(value2, other.value2);
53    }
54    @Override  
55    public boolean equals(Object   obj) {
56      if(obj instanceof Pair){
57        return equals((Pair)obj);
58      }
59      else return false;
60    }
61    @Override  
62    public int hashCode() {
63      return Misc.hashcode(value1)*31+Misc.hashcode(value2);
64    }
65    @Override  
66    public String   toString() {
67      return "("+value1+","+value2+")";
68    }
69    
70  }
71
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