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   *  Licensed to the Apache Software Foundation (ASF) under one
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   *  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
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  package org.apache.causeway.persistence.jdo.datanucleus.changetracking;
  
  import java.util.Objects;
  import java.util.Optional;
  
  import jakarta.annotation.Priority;
  import jakarta.inject.Inject;
  import jakarta.inject.Named;
  
  import org.datanucleus.enhancement.Persistable;
  
  import org.springframework.beans.factory.annotation.Qualifier;
  import org.springframework.stereotype.Service;
  
  import org.apache.causeway.applib.annotation.InteractionScope;
  import org.apache.causeway.applib.annotation.PriorityPrecedence;
  import org.apache.causeway.core.metamodel.services.objectlifecycle.PreAndPostValue;
  import org.apache.causeway.core.metamodel.services.objectlifecycle.PropertyValuePlaceholder;
  import org.apache.causeway.persistence.commons.integration.changetracking.PreAndPostValueEvaluatorService;
  import org.apache.causeway.persistence.jdo.datanucleus.entities.DnOidStoreAndRecoverHelper;
  
  import lombok.RequiredArgsConstructor;
  import lombok.extern.log4j.Log4j2;
  
  @Service
  @Named("causeway.persistence.jdo.PreAndPostValueEvaluatorServiceJdo")
  @Priority(PriorityPrecedence.MIDPOINT) // before the default
  @Qualifier("jdo")
  @InteractionScope   // see note above regarding this
  @RequiredArgsConstructor(onConstructor_ = {@Inject})
  @Log4j2
  public class PreAndPostValueEvaluatorServiceJdo implements PreAndPostValueEvaluatorService {
  
      @Override
      public boolean differ(PreAndPostValue papv) {
  
          // don't audit objects that were created and then immediately deleted within the same xactn
          if (papv.getPre() == PropertyValuePlaceholder.NEW
                  && papv.getPost() == PropertyValuePlaceholder.DELETED) {
              return false;
          }
          // but do always audit objects that have just been created or deleted
          if (papv.getPre() == PropertyValuePlaceholder.NEW
                  || papv.getPost() == PropertyValuePlaceholder.DELETED) {
              return true;
          }
          if (papv.getPre() instanceof Persistable) {
              Persistable prePersistable = (Persistable) papv.getPre();
  
              if (!(papv.getPost() instanceof Persistable)) {
                  // must be different, so publish
                  return true;
              }
              Persistable postPersistable = ((Persistable) papv.getPost());
  
              Optional<String> preOidIfAny = DnOidStoreAndRecoverHelper.forEntity(prePersistable).recoverOid();
              Optional<String> postOidIfAny = DnOidStoreAndRecoverHelper.forEntity(postPersistable).recoverOid();
  
              if (preOidIfAny.isPresent() || postOidIfAny.isPresent()) {
                  // at least one of the Persistables is hollow
                  return !Objects.equals(preOidIfAny, postOidIfAny);
              }
  
              // neither of the Persistables is hollow; should be safe to fall through.
  
          } else {
  
              if (papv.getPost() instanceof Persistable) {
                  // must be different, so publish
                  return true;
              }
  
              // should be safe to fall through.
          }
  
          // else - for updated objects - audit only if the property value has changed
          return !Objects.equals(papv.getPre(), papv.getPost());
      }
  
  }
  