EDIT

// $Id$

/**

* Copyright (C) 2016 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.hibernate;

import java.util.Collection;

import org.apache.log4j.Logger;

import org.hibernate.LazyInitializationException;

/**

 * Helper class to remove null values from collections which are left over artifacts due to

 * https://hibernate.atlassian.net/browse/HHH-9751

 *

 * @author a.kohlbecker

 * @date Jun 13, 2016

 *

 */

public class HHH_9751_Util {

    private static final Logger logger = Logger.getLogger(HHH_9751_Util.class);

    /**

     *

     * @param collection

     * @return the number of null values removed from the collection

     */

    static public int removeAllNull(Collection collection) {

        int cnt = 0;

        try {

           if (collection.contains(null)){

                while(collection.contains(null)){

                    cnt++;

                    collection.remove(null);

                }

            }

        } catch (LazyInitializationException e) {

            logger.info("Cannot clean up uninitialized children without a session, skipping.");

        }

        return cnt;

    }

}