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Java > Open Source Codes > soot > util > Cons


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 2004 Ondrej Lhotak
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the
16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17  * Boston, MA 02111-1307, USA.
18  */

19
20 package soot.util;
21
22 /** A Lisp-style cons cell. */
23 public final class Cons {
24     public Cons( Object JavaDoc car, Object JavaDoc cdr ) {
25         this.car = car;
26         this.cdr = cdr;
27     }
28     final private Object JavaDoc car;
29     final private Object JavaDoc cdr;
30     public int hashCode() {
31         int ret = 0;
32         if( car != null ) ret += car.hashCode();
33         if( cdr != null ) ret += cdr.hashCode();
34         return ret;
35     }
36     public boolean equals(Object JavaDoc o) {
37         if( !( o instanceof Cons ) ) return false;
38         Cons other = (Cons) o;
39         if( car == null ) {
40             if( other.car != null ) return false;
41         } else {
42             if( !car.equals(other.car) ) return false;
43         }
44         if( cdr == null ) {
45             if( other.cdr != null ) return false;
46         } else {
47             if( !cdr.equals(other.cdr) ) return false;
48         }
49         return true;
50     }
51     public Object JavaDoc car() { return car; }
52     public Object JavaDoc cdr() { return cdr; }
53 }
54
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