/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Common Public License (CPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.opensource.org/licenses/cpl1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.jikesrvm.compilers.opt;
import java.util.Enumeration;
import java.util.NoSuchElementException;
/**
* Enumeration that doesn't have any elements.
* Use the EMPTY object to access.
*/
public final class OPT_EmptyEnumerator implements Enumeration<Object> {
private static final OPT_EmptyEnumerator EMPTY = new OPT_EmptyEnumerator();
@SuppressWarnings({"unchecked", "RedundantCast"})
public static <T> Enumeration<T> emptyEnumeration() {
return (Enumeration<T>) (Enumeration) EMPTY;
}
public boolean hasMoreElements() {
return false;
}
public Object nextElement() {
throw new NoSuchElementException();
}
private OPT_EmptyEnumerator() {
}
}