soot.util.SingletonList Maven / Gradle / Ivy
/* 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;
}
}