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.param.parameter.mandatory;
  
  import org.apache.causeway.applib.annotation.Optionality;
  import org.apache.causeway.applib.annotation.Parameter;
  import org.apache.causeway.core.metamodel.facetapi.Facet;
  import org.apache.causeway.core.metamodel.facetapi.FacetHolder;
  import org.apache.causeway.core.metamodel.facets.objectvalue.mandatory.MandatoryFacet;
  import org.apache.causeway.core.metamodel.facets.objectvalue.mandatory.MandatoryFacetAbstract;
  
  public abstract class MandatoryFacetForParameterAnnotation
  extends MandatoryFacetAbstract {
  
      public static java.util.Optional<MandatoryFacet> create(
              final java.util.Optional<Parameter> parameterIfAny,
              final Class<?> parameterType,
              final FacetHolder holder) {
  
          if (parameterType.isPrimitive()) {
              return java.util.Optional.of(new MandatoryFacetForParameterAnnotation.Primitive(holder));
          }
  
          return parameterIfAny
          .map(Parameter::optionality)
          .filter(optionality -> optionality != Optionality.NOT_SPECIFIED)
          .map(optionality -> {
              switch (optionality) {
              case DEFAULT:
                  // do nothing here
                  return null;
              case MANDATORY:
                  return new MandatoryFacetForParameterAnnotation.Required(holder);
              case OPTIONAL:
                  return new MandatoryFacetForParameterAnnotation.Optional(holder);
              default:
              }
              throw new IllegalStateException("optionality '" + optionality + "' not recognised");
          });
      }
  
      protected MandatoryFacetForParameterAnnotation(final Semantics semantics, final FacetHolder holder) {
          super(semantics, holder);
      }
  
      protected MandatoryFacetForParameterAnnotation(
              final Semantics semantics, final FacetHolder holder, final Facet.Precedence precedence) {
          super(semantics, holder, precedence);
      }
  
      @Override
      public final String summarize() {
          return MandatoryFacetForParameterAnnotation.class.getSimpleName() + "." + super.summarize();
      }
  
      // -- IMPLEMENTATIONS
  
      public static class Primitive extends MandatoryFacetForParameterAnnotation {
          public Primitive(final FacetHolder holder) {
              super(Semantics.REQUIRED, holder);
          }
      }
  
      public static class Required extends MandatoryFacetForParameterAnnotation {
          public Required(final FacetHolder holder) {
              super(Semantics.REQUIRED, holder, Precedence.HIGH); // allow UI to be more strict than data/store
          }
      }
  
      public static class Optional extends MandatoryFacetForParameterAnnotation {
          public Optional(final FacetHolder holder) {
              super(Semantics.OPTIONAL, holder);
          }
      }
  
  }
  