/* Soot - a J*va Optimization Framework * Copyright (C) 2003 Ondrej Lhotak * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ package soot.util; /** A list containing exactly one object, immutable. * * @author Ondrej Lhotak */ public class SingletonList extends java.util.AbstractList { private Object o; public SingletonList( Object o ) { this.o = o; } public int size() { return 1; } public boolean contains( Object other ) { return other.equals(o); } public Object get( int index ) { if( index != 0 ) { throw new IndexOutOfBoundsException( "Singleton list; index = "+index ); } return o; } }