cdmlib-model/src/main/java/eu/etaxonomy/cdm/hibernate/HHH_9751_Util.java

   1 /**
   2 * Copyright (C) 2016 EDIT
   3 * European Distributed Institute of Taxonomy
   4 * http://www.e-taxonomy.eu
   5 *
   6 * The contents of this file are subject to the Mozilla Public License Version 1.1
   7 * See LICENSE.TXT at the top of this package for the full license terms.
   8 */
   9 package eu.etaxonomy.cdm.hibernate;
  10
  11 import java.util.Collection;
  12
  13 import org.apache.log4j.Logger;
  14 import org.hibernate.LazyInitializationException;
  15
  16
  17 /**
  18  * Helper class to remove null values from collections which are left over artifacts due to
  19  * https://hibernate.atlassian.net/browse/HHH-9751
  20  *
  21  * @author a.kohlbecker
  22  * @since Jun 13, 2016
  23  *
  24  */
  25 public class HHH_9751_Util {
  26
  27     private static final Logger logger = Logger.getLogger(HHH_9751_Util.class);
  28
  29     /**
  30      *
  31      * @param collection
  32      * @return the number of null values removed from the collection
  33      */
  34     static public int removeAllNull(Collection collection) {
  35
  36         int cnt = 0;
  37         try {
  38
  39            if (collection.contains(null)){
  40              while(collection.contains(null)){
  41                     cnt++;
  42                     collection.remove(null);
  43                 }
  44             }
  45
  46         } catch (LazyInitializationException e) {
  47             logger.info("Cannot clean up uninitialized children without a session, skipping.");
  48         }
  49         return cnt ;
  50     }
  51
  52 }