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.variable;
  
  import au.csiro.pathling.fhirpath.collection.Collection;
  import au.csiro.pathling.fhirpath.collection.ResourceCollection;
  import jakarta.annotation.Nonnull;
  import java.util.Optional;
  
  /**
   * A resolver that provides access to the input context and resource.
   *
   * @param resource the resource collection representing the root resource
   * @param inputContext the collection representing the input context
   * @author John Grimes
   * @see <a href="https://hl7.org/fhirpath/#environment-variables">FHIRPath environment variables</a>
   * @see <a href="https://hl7.org/fhir/R4/fhirpath.html#variables">FHIR-specific environment
   * variables</a>
   */
  public record ContextVariableResolver(
      @Nonnull ResourceCollection resource,
      @Nonnull Collection inputContext
  ) implements EnvironmentVariableResolver {
  
    @Override
    public Optional<Collection> get(@Nonnull final String name) {
      if (name.equals("%context")) {
        return Optional.of(inputContext);
      } else if (name.equals("%resource") || name.equals("%rootResource")) {
        return Optional.of(resource);
      } else {
        return Optional.empty();
      }
    }
  
  }
  