/* Copyright (C) 2004 - 2008  db4objects Inc.  http://www.db4o.com

This file is part of the db4o open source object database.

db4o is free software; you can redistribute it and/or modify it under
the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation and as clarified by db4objects' GPL 
interpretation policy, available at
http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
Suite 350, San Mateo, CA 94403, USA.

db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
package com.db4o.foundation;

import com.db4o.types.*;

/**
 * elements in linked list Collection4
 * 
 * @exclude
 */
public final class List4 implements Unversioned
{
	// TODO: encapsulate field access
	/**
	 * next element in list
	 */
	public List4 _next;
	
	/**
	 * carried object
	 */
	public Object _element;  
	
	/**
	 * db4o constructor to be able to store objects of this class
	 */
	public List4() {}
	
	public List4(Object element) {
		_element = element;
	}

	public List4(List4 next, Object element) {
		_next = next;
		_element = element;
	}

	boolean holds(Object obj) {
		if(obj == null){
			return _element == null;
		}
		return obj.equals(_element);
	}
	

	
}
