1 /* 2 * $Id$ 3 * 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, 15 * software distributed under the License is distributed on an 16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17 * KIND, either express or implied. See the License for the 18 * specific language governing permissions and limitations 19 * under the License. 20 */ 21 package org.apache.struts.util; 22 23 import java.util.Enumeration; 24 import java.util.Iterator; 25 import java.util.NoSuchElementException; 26 27 /** 28 * Utility method for converting Enumeration to an Iterator class. If you 29 * attempt to remove() an Object from the iterator, it will throw an 30 * UnsupportedOperationException. Added for use by TagLib so Enumeration can 31 * be supported 32 * 33 * @version $Rev$ $Date: 2005-05-07 12:11:38 -0400 (Sat, 07 May 2005) 34 * $ 35 */ 36 public class IteratorAdapter<E> implements Iterator<E> { 37 private Enumeration<E> e; 38 39 public IteratorAdapter(Enumeration<E> e) { 40 this.e = e; 41 } 42 43 public boolean hasNext() { 44 return e.hasMoreElements(); 45 } 46 47 public E next() { 48 if (!e.hasMoreElements()) { 49 throw new NoSuchElementException( 50 "IteratorAdaptor.next() has no more elements"); 51 } 52 53 return e.nextElement(); 54 } 55 56 public void remove() { 57 throw new UnsupportedOperationException( 58 "Method IteratorAdaptor.remove() not implemented"); 59 } 60 }