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.apache.wicket.model.IModel;
  import org.jspecify.annotations.NonNull;
  import org.jspecify.annotations.Nullable;
  
  import org.apache.causeway.commons.internal.base._Casts;
  import org.apache.causeway.core.metamodel.object.ManagedObject;
  import org.apache.causeway.core.metamodel.object.ManagedObjects;
  
  /**
   * @param <T> foreign type
   * @param <V> scalar value type
   */
  public abstract class ScalarConvertingModel<T, V>
  implements IModel<T> {
  
      private static final long serialVersionUID = 1L;
  
      private final UiAttributeWkt attributeModel;
  
      protected ScalarConvertingModel(final @NonNull UiAttributeWkt attributeModel) {
          this.attributeModel = attributeModel;
      }
  
      @Override
      public void setObject(final T modelValue) {
          var attributeModel = attributeModel();
          var value = toScalarValue(modelValue);
          var objectAdapter = value != null
                  ? attributeModel().getMetaModelContext().getObjectManager().adapt(value)
                  : ManagedObject.empty(attributeModel.getElementType());
          attributeModel.setObject(objectAdapter);
      }
  
      @Override
      public T getObject() {
          var adapter = attributeModel().getObject();
          final V scalarValue = !ManagedObjects.isNullOrUnspecifiedOrEmpty(adapter)
                  ? _Casts.uncheckedCast(adapter.getPojo())
                  : null;
          return fromScalarValue(scalarValue);
      }
  
      // -- HOOKS
  
      protected abstract V toScalarValue(@Nullable T t);
      protected abstract T fromScalarValue(@Nullable V value);
  
      // -- HELPER
  
      protected UiAttributeWkt attributeModel() {
          return attributeModel;
      }
  
  }
  