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.object.mixin;
  
  import java.lang.reflect.Constructor;
  import java.util.Optional;
  
  import org.apache.causeway.applib.annotation.DomainObject;
  import org.apache.causeway.applib.annotation.Nature;
  import org.apache.causeway.core.config.progmodel.ProgrammingModelConstants;
  import org.apache.causeway.core.metamodel.facetapi.FacetHolder;
  
  public class MixinFacetForDomainObjectAnnotation
  extends MixinFacetAbstract {
  
      public static Optional<MixinFacetForDomainObjectAnnotation> create(
              final Optional<DomainObject> domainObjectIfAny,
              final Class<?> candidateMixinType,
              final FacetHolder facetHolder) {
  
          return domainObjectIfAny
              .filter(domainObject -> domainObject.nature() == Nature.MIXIN)
              .map(domainObject -> {
  
                  var mixinContructors =
                          ProgrammingModelConstants.MixinConstructor.PUBLIC_SINGLE_ARG_RECEIVING_MIXEE
                          .getConstructors(candidateMixinType);
  
                  return mixinContructors.getSingleton() // empty if cardinality!=1
                  .map(constructor -> new MixinFacetForDomainObjectAnnotation(
                              candidateMixinType,
                              domainObject.mixinMethod(),
                              constructor,
                              facetHolder))
                  .orElse(null);
              });
      }
  
      private MixinFacetForDomainObjectAnnotation(
              final Class<?> mixinClass,
              final String mixinMethodName,
              final Constructor<?> constructor,
              final FacetHolder holder) {
          super(mixinClass, mixinMethodName, constructor, holder);
      }
  
  }
  