001/*
002 *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003 *
004 *  This file is licensed to You under the Eclipse Public License (EPL);
005 *  You may not use this file except in compliance with the License. You
006 *  may obtain a copy of the License at
007 *
008 *      http://www.opensource.org/licenses/eclipse-1.0.php
009 *
010 *  See the COPYRIGHT.txt file distributed with this work for information
011 *  regarding copyright ownership.
012 */
013package org.jikesrvm.compilers.opt.util;
014
015import java.util.Enumeration;
016
017public class CompoundEnumerator<T> implements Enumeration<T> {
018  private final Enumeration<T> first;
019  private final Enumeration<T> second;
020
021  public CompoundEnumerator(Enumeration<T> first, Enumeration<T> second) {
022    this.first = first;
023    this.second = second;
024  }
025
026  @Override
027  public boolean hasMoreElements() {
028    return first.hasMoreElements() || second.hasMoreElements();
029  }
030
031  @Override
032  public T nextElement() {
033    if (first.hasMoreElements()) {
034      return first.nextElement();
035    } else {
036      return second.nextElement();
037    }
038  }
039}