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.value;
  
  import java.io.Serializable;
  
  import org.jspecify.annotations.NonNull;
  
  import org.apache.causeway.applib.Identifier;
  import org.apache.causeway.commons.functional.Either;
  import org.apache.causeway.commons.internal.exceptions._Exceptions;
  import org.apache.causeway.core.metamodel.commons.ViewOrEditMode;
  import org.apache.causeway.core.metamodel.context.HasMetaModelContext;
  import org.apache.causeway.core.metamodel.facets.object.value.ValueFacet;
  import org.apache.causeway.core.metamodel.spec.feature.ObjectActionParameter;
  import org.apache.causeway.core.metamodel.spec.feature.ObjectFeature;
  import org.apache.causeway.core.metamodel.spec.feature.OneToOneAssociation;
  
  import lombok.Synchronized;
  
  abstract class ValueSemanticsModelAbstract
  implements
      HasMetaModelContext,
      Serializable {
  
      private static final long serialVersionUID = 1L;
  
      protected final Identifier featureIdentifier;
      protected final ViewOrEditMode scalarRepresentation;
      protected transient Either<OneToOneAssociation, ObjectActionParameter> propOrParam;
  
      protected ValueSemanticsModelAbstract(
              final @NonNull ObjectFeature propOrParam,
              final @NonNull ViewOrEditMode scalarRepresentation) {
          this.scalarRepresentation = scalarRepresentation;
          this.propOrParam = propOrParam instanceof OneToOneAssociation // memoize
                  ? Either.left((OneToOneAssociation)propOrParam)
                  : Either.right((ObjectActionParameter)propOrParam);
          this.featureIdentifier = propOrParam.getFeatureIdentifier();
      }
  
      // -- HELPER
  
      @Synchronized
      protected ObjectFeature feature() {
          if(propOrParam==null) {
              var feature = getSpecificationLoader().loadFeature(featureIdentifier).orElse(null);
              this.propOrParam = (feature instanceof OneToOneAssociation)
                      ? Either.left((OneToOneAssociation)feature)
                      : Either.right(((ObjectActionParameter)feature));
          }
          return propOrParam.fold(
                  ObjectFeature.class::cast,
                  ObjectFeature.class::cast);
      }
  
      protected ValueFacet<?> valueFacet() {
          var feature = feature();
          var valueFacet = feature.getElementType()
                  .valueFacet()
                  .orElseThrow(()->_Exceptions.noSuchElement(
                          "Value type Property or Parameter %s is missing a ValueFacet",
                          feature.getFeatureIdentifier()));
  
          return valueFacet;
      }
  
  }
  