content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
   *
   *  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.apache.causeway.persistence.jdo.datanucleus.mixins;
  
  import javax.jdo.JDOHelper;
  
  import org.datanucleus.enhancement.Persistable;
  
  import org.apache.causeway.applib.annotation.MemberSupport;
  import org.apache.causeway.applib.annotation.Property;
  import org.apache.causeway.applib.annotation.PropertyLayout;
  import org.apache.causeway.applib.annotation.Where;
  import org.apache.causeway.applib.layout.LayoutConstants;
  
  import lombok.RequiredArgsConstructor;
  
  /**
   * Contributes the value of the version (introduced by enhancing, and used by
   * the ORM for optimistic locking) as a property.
   *
   * <p>
   * Only visible if the version can be cast to a {@link java.sql.Timestamp}.
   * </p>
   *
   * @see Persistable_datanucleusVersionLong
   *
   * @since 2.0 {@index}
   */
  @Property(
          domainEvent = Persistable_datanucleusVersionTimestamp.PropertyDomainEvent.class)
  @PropertyLayout(
          describedAs = "This value is set to the current time each time the entity is updated in the database, and is used to detect conflicting concurrent changes",
          fieldSetId = LayoutConstants.FieldSetId.METADATA,
          hidden = Where.ALL_TABLES,
          named = "Version",
          sequence = "500.2"
          )
  @RequiredArgsConstructor
  public class Persistable_datanucleusVersionTimestamp {
  
      private final Persistable persistable;
  
      public static class PropertyDomainEvent
      extends org.apache.causeway.applib.CausewayModuleApplib.PropertyDomainEvent
      <Persistable_datanucleusVersionTimestamp, java.sql.Timestamp> {}
  
      @MemberSupport public java.sql.Timestamp prop() {
          final Object version = JDOHelper.getVersion(persistable);
          return version instanceof java.sql.Timestamp ? (java.sql.Timestamp) version : null;
      }
  
      @MemberSupport public boolean hideProp() {
          return prop() == null;
      }
  
  }
  