content: /*
   * Copyright © 2018-2025 Commonwealth Scientific and Industrial Research
   * Organisation (CSIRO) ABN 41 687 119 230.
   *
   * Licensed 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 au.csiro.pathling.fhirpath.definition.fhir;
  
  import static java.util.Objects.requireNonNull;
  
  import au.csiro.pathling.fhirpath.definition.ElementDefinition;
  import ca.uhn.fhir.context.BaseRuntimeElementDefinition;
  import ca.uhn.fhir.context.RuntimeChildChoiceDefinition;
  import ca.uhn.fhir.context.RuntimeChildResourceDefinition;
  import jakarta.annotation.Nonnull;
  import java.util.List;
  import org.hl7.fhir.instance.model.api.IBaseResource;
  import org.hl7.fhir.r4.model.Enumerations.FHIRDefinedType;
  import org.hl7.fhir.r4.model.Reference;
  
  /**
   * Encapsulates the FHIR definitions for a reference element.
   *
   * @author John Grimes
   */
  class FhirReferenceDefinition extends FhirElementDefinition implements ElementDefinition {
  
  
    private final List<Class<? extends IBaseResource>> resourceTypes;
  
  
    protected FhirReferenceDefinition(@Nonnull final RuntimeChildChoiceDefinition childDefinition,
        @Nonnull final String elementName) {
      super(requireNonNull(childDefinition.getChildElementDefinitionByDatatype(Reference.class)),
          childDefinition,
          elementName);
      resourceTypes = childDefinition.getResourceTypes();
      requireNonNull(resourceTypes);
    }
  
    protected FhirReferenceDefinition(@Nonnull final RuntimeChildResourceDefinition childDefinition) {
      super(childDefinition);
      resourceTypes = childDefinition.getResourceTypes();
      requireNonNull(resourceTypes);
    }
  
    public static boolean isReferenceDefinition(
        @Nonnull final BaseRuntimeElementDefinition<?> elementDefinition) {
      return FHIRDefinedType.REFERENCE.toCode().equals(elementDefinition.getName());
    }
  
  }
  