/*
    * Copyright 2005-2008 The Kuali Foundation
    * 
    * 
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
   * 
   * 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.kuali.rice.kew.util;
  
  import java.util.ArrayList;
  import java.util.Enumeration;
  import java.util.Iterator;
  import java.util.List;
  
  /*
   * A simple Enumeration implementation which is backed by a List and it's Iterator.
   * Provides a few convienance constructors for creating the Enumeration.
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class SimpleEnumeration<T> implements Enumeration<T> {
  
  	private List<T> internalList = new ArrayList<T>();
  	private Iterator<T> iterator;
  	
  	public SimpleEnumeration(T object) {
  		if (object != null) {
  			internalList.add(object);
  		}
  		iterator = internalList.iterator();
  	}
  	
  	public SimpleEnumeration(Enumeration<T> enumeration, T object) {
  		while (enumeration.hasMoreElements()) {
  			internalList.add(enumeration.nextElement());
  		}
  		internalList.add(object);
  		iterator = internalList.iterator();
  	}
  	
  	public SimpleEnumeration(Enumeration<T> enumeration1, Enumeration<T> enumeration2) {
  		while (enumeration1.hasMoreElements()) {
  			internalList.add(enumeration1.nextElement());
  		}
  		while (enumeration2.hasMoreElements()) {
  			internalList.add(enumeration2.nextElement());
  		}
  		iterator = internalList.iterator();
  	}
  	
  	public boolean hasMoreElements() {
  		return iterator.hasNext();
  	}
  
  	public T nextElement() {
  		return iterator.next();
  	}
  
  }