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.core.metamodel.objectmanager.memento;
  
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.commons.handler.ChainOfResponsibility;
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  import org.apache.causeway.core.metamodel.objectmanager.ObjectManager.MementoRecreateRequest;
  
  public record ObjectDementifierFactory() {
  
      public static ChainOfResponsibility<MementoRecreateRequest, ManagedObject> createChain() {
          return new ChainOfResponsibility<>("ObjectDementifier", BuiltinHandlers.values());
      }
  
      // -- HANDLERS
  
      enum BuiltinHandlers implements ChainOfResponsibility.Handler<MementoRecreateRequest, ManagedObject> {
          EMPTY {
              @Override
              public boolean isHandling(final MementoRecreateRequest request) {
                  return request.memento() instanceof ObjectMementoEmpty;
              }
              @Override
              public ManagedObject handle(final MementoRecreateRequest request) {
                  return ManagedObject.empty(request.objectSpecification());
              }
          },
          SCALAR {
              @Override
              public boolean isHandling(final MementoRecreateRequest request) {
                  return request.memento() instanceof ObjectMementoSingular;
              }
              @Override
              public ManagedObject handle(final MementoRecreateRequest request) {
                  var spec = request.objectSpecification();
                  var mmc = spec.getMetaModelContext();
                  // intercept when managed by Spring
                  return spec.getBeanSort().policy().isInjectable()
                      ? mmc.lookupServiceAdapterById(request.memento().logicalType().logicalName())
                      : mmc.getObjectManager().loadObjectElseFail(request.memento().bookmark());
              }
          },
          PACKED {
              @Override
              public boolean isHandling(final MementoRecreateRequest request) {
                  return request.memento() instanceof ObjectMementoPacked;
              }
              @Override
              public ManagedObject handle(final MementoRecreateRequest request) {
                  var elementSpec = request.objectSpecification();
                  var om = elementSpec.getMetaModelContext().getObjectManager();
                  var objects = ((ObjectMementoPacked)request.memento()).streamElements()
                          .map(om::demementify) // recursively unwrap
                          .collect(Can.toCan());
                  return ManagedObject.packed(elementSpec, objects);
              }
          }
      }
  }
  