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  package org.apache.cayenne.access;
  
  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.reflect.ClassDescriptor;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  class HierarchicalObjectResolverNode extends PrefetchObjectResolver {
  
      private PrefetchProcessorNode node;
  
      HierarchicalObjectResolverNode(PrefetchProcessorNode node, DataContext context, ClassDescriptor descriptor,
              boolean refresh, Map<ObjectId, Persistent> seen) {
          super(context, descriptor, refresh, seen);
          this.node = node;
      }
  
      @Override
      List<Persistent> objectsFromDataRows(List<? extends DataRow> rows) {
  
          if (rows == null || rows.size() == 0) {
              return new ArrayList<>(1);
          }
  
          List<Persistent> results = new ArrayList<>(rows.size());
  
          for (DataRow row : rows) {
  
              // determine entity to use
              ClassDescriptor classDescriptor = descriptorResolutionStrategy.descriptorForRow(row);
  
              // not using DataRow.createObjectId for performance reasons -
              // ObjectResolver
              // has all needed metadata already cached.
              ObjectId anId = createObjectId(row, classDescriptor.getEntity(), CayennePath.EMPTY_PATH);
  
              Persistent object = objectFromDataRow(row, anId, classDescriptor);
              if (object == null) {
                  throw new CayenneRuntimeException("Can't build Object from row: %s", row);
              }
  
              // keep the dupe objects (and data rows) around, as there maybe an
              // attached
              // joint prefetch...
              results.add(object);
  
              node.getParentAttachmentStrategy().linkToParent(row, object);
          }
  
          // now deal with snapshots
  
          // TODO: refactoring: dupes will clutter the lists and cause extra
          // processing...
          // removal of dupes happens only downstream, as we need the objects
          // matching
          // fetched rows for joint prefetch resolving... maybe pushback unique
          // and
          // non-unique lists to the "node", instead of returning a single list
          // from this
          // method
          cache.snapshotsUpdatedForObjects(results, rows, refreshObjects);
  
          return results;
      }
  }
  