KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > soot > util > SingletonList


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 2003 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 list containing exactly one object, immutable.
23  *
24  * @author Ondrej Lhotak
25  */
26
27 public class SingletonList extends java.util.AbstractList JavaDoc {
28     private Object JavaDoc o;
29     public SingletonList( Object JavaDoc o ) { this.o = o; }
30     public int size() { return 1; }
31     public boolean contains( Object JavaDoc other ) { return other.equals(o); }
32     public Object JavaDoc get( int index ) {
33         if( index != 0 ) {
34             throw new IndexOutOfBoundsException JavaDoc( "Singleton list; index = "+index );
35         }
36         return o;
37     }
38 }
39
Popular Tags