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
   *
   *    https://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.cayenne.access;
  
  import java.util.Map;
  
  import org.apache.cayenne.DataRow;
  import org.apache.cayenne.ObjectId;
  import org.apache.cayenne.Persistent;
  import org.apache.cayenne.reflect.ClassDescriptor;
  
  /**
   * @since 4.0
   */
  class PrefetchObjectResolver extends ObjectResolver {
  
      private Map<ObjectId, Persistent> seen;
  
      PrefetchObjectResolver(DataContext context, ClassDescriptor descriptor, boolean refresh,
              Map<ObjectId, Persistent> seen) {
          super(context, descriptor, refresh);
          this.seen = seen;
      }
  
      @Override
      Persistent objectFromDataRow(DataRow row, ObjectId anId, ClassDescriptor classDescriptor) {
          // skip processing of objects that were already processed in this
          // transaction, either by this node or by some other node...
          // added per CAY-1695 ..
  
          Persistent object = seen.get(anId);
          if (object == null) {
              object = super.objectFromDataRow(row, anId, classDescriptor);
              seen.put(anId, object);
          }
  
          return object;
      }
  
  }
  