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/*
Copyright  1999 CERN - European Organization for Nuclear Research.
Permission to use, copy, modify, distribute and sell this software and its documentation for any purpose 
is hereby granted without fee, provided that the above copyright notice appear in all copies and 
that both that copyright notice and this permission notice appear in supporting documentation. 
CERN makes no representations about the suitability of this software for any purpose. 
It is provided "as is" without expressed or implied warranty.
%%Ignore-License
 */
package cern.colt;

/**
 * This empty class is the common root for all persistent capable classes. If
 * this class inherits from java.lang.Object then all subclasses are
 * serializable with the standard Java serialization mechanism. If this class
 * inherits from com.objy.db.app.ooObj then all subclasses are
 * additionally serializable with the Objectivity ODBMS persistance
 * mechanism. Thus, by modifying the inheritance of this class the entire tree
 * of subclasses can be switched to Objectivity compatibility (and back) with
 * minimum effort.
 */
public abstract class PersistentObject extends Object implements
		java.io.Serializable, Cloneable {
	public static final long serialVersionUID = 1020L;

	/**
	 * Not yet commented.
	 */
	protected PersistentObject() {
	}

	/**
	 * Returns a copy of the receiver. This default implementation does not
	 * nothing except making the otherwise protected clone method
	 * public.
	 * 
	 * @return a copy of the receiver.
	 */
	public Object clone() {
		try {
			return super.clone();
		} catch (CloneNotSupportedException exc) {
			throw new InternalError(); // should never happen since we are
										// cloneable
		}
	}
}