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.facets.properties.defaults.fromtype;
  
  import jakarta.inject.Inject;
  
  import org.apache.causeway.core.metamodel.context.MetaModelContext;
  import org.apache.causeway.core.metamodel.facetapi.FacetUtil;
  import org.apache.causeway.core.metamodel.facetapi.FeatureType;
  import org.apache.causeway.core.metamodel.facets.FacetFactoryAbstract;
  import org.apache.causeway.core.metamodel.facets.object.defaults.DefaultedFacet;
  import org.apache.causeway.core.metamodel.facets.properties.defaults.PropertyDefaultFacet;
  import org.apache.causeway.core.metamodel.spec.ObjectSpecification;
  
  public class PropertyDefaultFacetFromTypeFactory
  extends FacetFactoryAbstract {
  
      @Inject
      public PropertyDefaultFacetFromTypeFactory(final MetaModelContext mmc) {
          super(mmc, FeatureType.PROPERTIES_ONLY);
      }
  
      /**
       * If there is a {@link DefaultedFacet} on the properties return type, then
       * installs a {@link PropertyDefaultFacet} for the property with the same
       * default.
       */
      @Override
      public void process(final ProcessMethodContext processMethodContext) {
          // don't overwrite any defaults that might already picked up
          final PropertyDefaultFacet existingDefaultFacet = processMethodContext.getFacetHolder()
                  .lookupNonFallbackFacet(PropertyDefaultFacet.class)
                  .orElse(null);
          if (existingDefaultFacet != null) {
              return;
          }
  
          // try to infer defaults from the underlying return type
          final Class<?> returnType = processMethodContext.getMethod().getReturnType();
          final DefaultedFacet returnTypeDefaultedFacet = getDefaultedFacet(returnType);
          if (returnTypeDefaultedFacet != null) {
              FacetUtil.addFacet(
                      new PropertyDefaultFacetFromDefaultedFacet(
                              returnTypeDefaultedFacet, processMethodContext.getFacetHolder()));
          }
      }
  
      private DefaultedFacet getDefaultedFacet(final Class<?> paramType) {
          final ObjectSpecification paramTypeSpec = getSpecificationLoader().loadSpecification(paramType);
          return paramTypeSpec.getFacet(DefaultedFacet.class);
      }
  
  }
  