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.domainobject;
  
  import org.jspecify.annotations.NonNull;
  
  import org.apache.causeway.applib.Identifier;
  import org.apache.causeway.applib.id.LogicalType;
  import org.apache.causeway.commons.internal.reflection._Reflect;
  import org.apache.causeway.core.metamodel.facetapi.FacetHolder;
  import org.apache.causeway.core.metamodel.specloader.validator.ValidationFailure;
  
  import static org.apache.causeway.commons.internal.reflection._Reflect.predicates.paramCount;
  
  record MetaModelValidatorForMixinTypes(
      @NonNull String annotation) {
  
      public boolean ensureMixinType(
              final @NonNull FacetHolder facetHolder,
              final Class<?> candidateMixinType) {
  
          var mixinContructors = _Reflect
                  .getPublicConstructors(candidateMixinType)
                  .filter(paramCount(1));
  
          if(mixinContructors.getCardinality().isOne()) return true; // happy case
  
          if(mixinContructors.getCardinality().isZero()) {
              ValidationFailure.raise(
                      facetHolder.getSpecificationLoader(),
                      Identifier.classIdentifier(LogicalType.fqcn(candidateMixinType)),
                      String.format(
                          "%s: annotated with %s annotation but does not have a public 1-arg constructor",
                          candidateMixinType.getName(),
                          annotation)
                      );
          } else {
              ValidationFailure.raise(
                      facetHolder.getSpecificationLoader(),
                      Identifier.classIdentifier(LogicalType.fqcn(candidateMixinType)),
                      String.format(
                              "%s: annotated with %s annotation needs a single public 1-arg constructor but has %d",
                              candidateMixinType.getName(),
                              annotation,
                              mixinContructors.size())
                      );
          }
          return false;
      }
  
  }
  