ExcludingEnumeration.java

/**
 * Copyright 2010 JBoss Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.eclipse.webdav.internal.kernel.utils;

import java.util.Enumeration;
import java.util.Vector;

public class ExcludingEnumeration extends EnumerationFilter {

	protected Enumeration e;
	protected Vector excludeList;
	protected Object next;

	public ExcludingEnumeration(Enumeration e, Vector excludeList) {
		super();
		this.e = e;
		this.excludeList = excludeList;
		getNextCandidate();
	}

	private void getNextCandidate() {
		while (e.hasMoreElements()) {
			Object candidate = e.nextElement();
			if (excludeList.indexOf(candidate) != -1) {
				next = candidate;
				return;
			}
		}
		next = null;
	}

	/**
	 * @see #hasMoreElements()
	 */
	public boolean hasMoreElements() {
		return (next != null);
	}

	/**
	 * @see #nextElement()
	 */
	public Object nextElement() {
		Object answer = next;
		getNextCandidate();
		return answer;
	}
}