de.intarsys.tools.collection.EnumerationIterator Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of isrt Show documentation
The basic runtime tools and interfaces for intarsys components.
There is a newer version: 4.11
/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - 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.
 *
 * - Neither the name of intarsys nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
 */
package de.intarsys.tools.collection;

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

/**
 * Wraps an enumeration into an Iterator API.
 * 
 */
public class EnumerationIterator implements Iterator {
	private Enumeration enumeration;

	/**
	 * Create an Iterator over an enumeration.
	 * 
	 * @param e
	 *            The enumeration to be iterated.
	 */
	public EnumerationIterator(Enumeration e) {
		super();
		setEnumeration(e);
	}

	protected java.util.Enumeration getEnumeration() {
		return enumeration;
	}

	/**
	 * Return true if underlying enumeration still has elements.
	 * 
	 * @return true if underlying enumeration still has elements.
	 */
	public boolean hasNext() {
		if (getEnumeration() == null) {
			return false;
		}
		return getEnumeration().hasMoreElements();
	}

	/**
	 * Return the next element from the underlying enumeration.
	 * 
	 * @return the next element from the underlying enumeration.
	 * 
	 * @throws NoSuchElementException
	 */
	public T next() {
		if (getEnumeration() == null) {
			throw new NoSuchElementException("enumeration not available");
		}
		return (T) getEnumeration().nextElement();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.util.Iterator#remove()
	 */
	public void remove() {
		throw new UnsupportedOperationException();
	}

	private void setEnumeration(java.util.Enumeration newEnumeration) {
		enumeration = newEnumeration;
	}
}