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.viewer.wicket.model.models;
  
  import org.jspecify.annotations.NonNull;
  
  import org.springframework.util.ClassUtils;
  
  import org.apache.causeway.commons.internal.assertions._Assert;
  import org.apache.causeway.commons.internal.base._Casts;
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  import org.apache.causeway.core.metamodel.object.MmUnwrapUtils;
  
  /**
   * Wraps and unwraps the contained value within {@link ManagedObject},
   * as provided by a {@link UiAttributeWkt}.
   */
  record ScalarUnwrapper<T>(
      Class<T> type,
      UiAttributeWkt attributeModel) {
  
      // canonical constructor
      public ScalarUnwrapper(
              final @NonNull Class<T> type,
              final @NonNull UiAttributeWkt attributeModel) {
          this.type = type;
          this.attributeModel = attributeModel;
          _Assert.assertTrue(attributeModel.getElementType().isAssignableFrom(type), ()->
                  String.format("cannot possibly unwrap model of type %s into target type %s",
                          attributeModel.getElementType().getCorrespondingClass(),
                          type));
      }
  
      public T getObject() {
          var objectAdapter = attributeModel().getObject();
          var pojo = unwrap(objectAdapter);
          return pojo;
      }
  
      public void setObject(final T object) {
          var attributeModel = attributeModel();
          if (object == null) {
              attributeModel.setObject(null);
          } else {
              var objectAdapter = attributeModel.getMetaModelContext().getObjectManager().adapt(object);
              attributeModel.setObject(objectAdapter);
          }
      }
  
      // -- HELPER
  
      private T unwrap(final ManagedObject objectAdapter) {
          var pojo = MmUnwrapUtils.single(objectAdapter);
          if(pojo==null
                  || !ClassUtils.resolvePrimitiveIfNecessary(type)
                          .isAssignableFrom(ClassUtils.resolvePrimitiveIfNecessary(pojo.getClass()))) {
              return null;
          }
          return _Casts.uncheckedCast(pojo);
      }
  
  }