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.StringCollection;
  import jakarta.annotation.Nonnull;
  import java.util.Optional;
  
  /**
   * A resolver for HL7 FHIR ValueSets.
   *
   * @author John Grimes
   * @see <a href="https://build.fhir.org/fhirpath.html#vars">FHIR-specific environment
   * variables</a>
   */
  public class Hl7ValueSetResolver implements EnvironmentVariableResolver {
  
    private static final String NAME_PREFIX = "vs-";
  
    @Override
    public Optional<Collection> get(@Nonnull final String name) {
      if (name.startsWith(NAME_PREFIX)) {
        final String valueSetName = name.substring(NAME_PREFIX.length());
        return Optional.of(
            StringCollection.fromValue("http://hl7.org/fhir/ValueSet/" + valueSetName));
      } else {
        return Optional.empty();
      }
    }
  
  }
  