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  package org.apache.cayenne.access;
  
  import java.util.Collection;
  
  import org.apache.cayenne.CayenneRuntimeException;
  import org.apache.cayenne.DataRow;
  import org.apache.cayenne.ObjectId;
  import org.apache.cayenne.Persistent;
  import org.apache.cayenne.exp.path.CayennePath;
  import org.apache.cayenne.graph.GraphManager;
  import org.apache.cayenne.map.ObjEntity;
  import org.apache.cayenne.reflect.ClassDescriptor;
  
  /**
   * A ParentAttachmentStrategy that extracts parent ObjectId from the joined columns in the
   * child snapshot.
   */
  class JoinedIdParentAttachmentStrategy implements ParentAttachmentStrategy {
  
      private final CayennePath relatedIdPrefix;
      private final Collection<ObjEntity> sourceEntities;
      private final PrefetchProcessorNode node;
      private final GraphManager graphManager;
  
      JoinedIdParentAttachmentStrategy(GraphManager graphManager, PrefetchProcessorNode node) {
          ClassDescriptor parentDescriptor = ((PrefetchProcessorNode) node.getParent())
                  .getResolver()
                  .getDescriptor();
  
          relatedIdPrefix = node
                  .getIncoming()
                  .getRelationship()
                  .getReverseDbRelationshipPath();
  
          sourceEntities = parentDescriptor.getEntityInheritanceTree().allSubEntities();
  
          this.node = node;
          this.graphManager = graphManager;
      }
  
      public void linkToParent(DataRow row, Persistent object) {
          Persistent parentObject = null;
  
          for (ObjEntity entity : sourceEntities) {
              if (entity.isAbstract()) {
                  continue;
              }
  
              ObjectId id = node.getResolver().createObjectId(row, entity, relatedIdPrefix);
              if (id == null) {
                  throw new CayenneRuntimeException("Can't build ObjectId from row: %s, entity: %s, prefix: %s"
                          , row, entity.getName(), relatedIdPrefix);
              }
  
              parentObject = (Persistent) graphManager.getNode(id);
              if (parentObject != null) {
                  break;
              }
          }
  
          node.linkToParent(object, parentObject);
      }
  }
  