EnumerationIterator.java Source code

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Here is the source code for EnumerationIterator.java

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/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS 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 AUTHOR OR 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.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

import java.util.Enumeration;
import java.util.Iterator;

/**
 * A GOF Adapter to make instances of old Enumeration interface behave like new
 * Iterator interface, so we only have to deal with one well-defined
 * implementation of the Iterator pattern.
 */
public class EnumerationIterator implements Iterator {

    /** The Enumeration being delegated to */
    private final Enumeration oldEnum;

    /**
     * Construct an EnumerationIterator from an old-style Enumeration.
     * 
     * @param old
     *            The Enumeration to be adapted.
     */
    public EnumerationIterator(final Enumeration old) {
        oldEnum = old;
    }

    /**
     * Fulfuls the general contract of Iterator.hasNext(), that is, return true
     * as long as there is at least one more item in the Iterator.
     */
    public boolean hasNext() {
        return oldEnum.hasMoreElements();
    }

    /**
     * Fulfuls the general contract of Iterator.next(), that is, returns the
     * next element in the Iterator.
     */
    public Object next() {
        return oldEnum.nextElement();
    }

    /**
     * Remove is not implemented (optional method).
     * 
     * @throws java.lang.UnsupportedOperationException
     *             in all cases.
     */
    public void remove() {
        throw new UnsupportedOperationException("remove");
    }
}