/*

  * Copyright 2011 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 1.0 (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/ecl1.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.core.api.mo.common;

 /**

  * This interface can be used to identify a model object which has a version number

  * that is used for the purposes of optimistic locking.

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  *

  */

 public interface Versioned {

         /**

          * Returns the version number for this object.  In general, this value should only

          * be null if the object has not yet been stored to a persistent data store.

          * This version number is generally used for the purposes of optimistic locking.

          * 

          * @return the version number, or null if one has not been assigned yet

          */

         Long getVersionNumber();

 }