How freaky. I just added the same thing but as a part of a
CollectionsUtils class. I thought that would be a good way to hide it so
a later stage could see it using the Commons.Collections version.
Bay
On 24 Aug 2001 [EMAIL PROTECTED] wrote:
> dlr 01/08/24 12:05:43
>
> Added: util/src/java/org/apache/commons/util
> EnumerationIterator.java
> Log:
> An Enumeration wrapper which implements the Iterator interface.
>
> Revision Changes Path
> 1.1
>jakarta-commons-sandbox/util/src/java/org/apache/commons/util/EnumerationIterator.java
>
> Index: EnumerationIterator.java
> ===================================================================
> package org.apache.commons.util;
>
> /* ====================================================================
> * The Apache Software License, Version 1.1
> *
> * Copyright (c) 2001 The Apache Software Foundation. All rights
> * reserved.
> *
> * Redistribution and use in source and binary forms, with or without
> * modification, are permitted provided that the following conditions
> * are met:
> *
> * 1. Redistributions of source code must retain the above copyright
> * notice, this list of conditions and the following disclaimer.
> *
> * 2. Redistributions in binary form must reproduce the above copyright
> * notice, this list of conditions and the following disclaimer in
> * the documentation and/or other materials provided with the
> * distribution.
> *
> * 3. The end-user documentation included with the redistribution,
> * if any, must include the following acknowledgment:
> * "This product includes software developed by the
> * Apache Software Foundation (http://www.apache.org/)."
> * Alternately, this acknowledgment may appear in the software itself,
> * if and wherever such third-party acknowledgments normally appear.
> *
> * 4. The names "Apache" and "Apache Software Foundation" and
> * "Apache Turbine" must not be used to endorse or promote products
> * derived from this software without prior written permission. For
> * written permission, please contact [EMAIL PROTECTED]
> *
> * 5. Products derived from this software may not be called "Apache",
> * "Apache Turbine", nor may "Apache" appear in their name, without
> * prior written permission of the Apache Software Foundation.
> *
> * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
> * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
> * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
> * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
> * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
> * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
> * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
> * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
> * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
> * SUCH DAMAGE.
> * ====================================================================
> *
> * This software consists of voluntary contributions made by many
> * individuals on behalf of the Apache Software Foundation. For more
> * information on the Apache Software Foundation, please see
> * <http://www.apache.org/>.
> */
>
> import java.util.Collection;
> import java.util.Enumeration;
> import java.util.Iterator;
>
> /**
> * An <code>Enumeration</code> wrapper class which implements the
> * <code>Iterator</code> interface.
> *
> * @author <a href="mailto:[EMAIL PROTECTED]";>Daniel Rall</a>
> * @version $Id: EnumerationIterator.java,v 1.1 2001/08/24 19:05:43 dlr Exp $
> */
> public class EnumerationIterator implements Iterator
> {
> private Collection collection;
>
> private Enumeration enum;
>
> private Object last = null;
>
> /**
> * Creates an instance on which {@link #remove()} can be called.
> *
> * @param enum The enumeration to wrap.
> * @param collection The <code>Collection</code> being iterated.
> */
> public EnumerationIterator(Enumeration enum, Collection collection)
> {
> if (enum != null)
> {
> this.enum = enum;
> this.collection = collection;
> }
> else
> {
> throw new NullPointerException("enum cannot be null");
> }
> }
>
> /**
> * Creates an instance on which {@link #remove()} cannot be called.
> *
> * @param enum The enumeration to wrap.
> */
> public EnumerationIterator(Enumeration enum)
> {
> this(enum, null);
> }
>
> public boolean hasNext()
> {
> return enum.hasMoreElements();
> }
>
> public Object next()
> {
> last = enum.nextElement();
> return last;
> }
>
> /**
> * Functions if an associated <code>Collection</code> is known.
> *
> * @exception IllegalStateException <code>next()</code> not called.
> * @exception UnsupportedOperationException No associated
> * <code>Collection</code>.
> */
> public void remove()
> {
> if (collection != null)
> {
> if (last != null)
> {
> collection.remove(last);
> }
> else
> {
> throw new IllegalStateException
> ("next() must have been called for remove() to function");
> }
> }
> else
> {
> throw new UnsupportedOperationException
> ("No Collection associated with this Iterator");
> }
> }
> }
>
>
>
>
