/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
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 */
package com.sun.ejb.portable;

import java.util.*;
import java.io.Serializable;

/**
 * This class is necessary because neither Vector nor Hashtable
 * return a Serializable Enumeration, which can be sent from the
 * EJB server back to the client.
 * This class must be available at the client too, and it could
 * be instantiated in another vendor's container.
 *
 */

public final class ObjrefEnumeration implements Enumeration, Serializable
{
    private int count=0;
    private ArrayList objrefs;

    // This is called only by the EJB container in the RI.
    public void add(Object obj)
    {
	if ( objrefs == null )
	    objrefs = new ArrayList();
	objrefs.add(obj);
    }

    public boolean hasMoreElements()
    {
	if ( objrefs == null )
	    return false;
	return count < objrefs.size();
    }

    public Object nextElement()
    {
	if ( objrefs != null ) {
	    synchronized (this) {
		if (count < objrefs.size()) {
		    return objrefs.get(count++);
		}
	    }
	}
	throw new NoSuchElementException("ObjrefEnumeration");
    }
}