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;
  
  import jakarta.annotation.Nullable;
  import org.hl7.fhir.r4.model.Coding;
  
  /**
   * Helper functions for codings.
   */
  public interface CodingHelpers {
  
    /**
     * Tests for coding equality using only their systems, codes and versions. Two codings are equal
     * if both their systems and codes are equal and either the versions are equal or at least one
     * version is null.
     *
     * @param left the left coding.
     * @param right the right coding.
     * @return if codings satisfy the equality criteria above.
     */
    static boolean codingEquals(@Nullable final Coding left,
        @Nullable final Coding right) {
      if (left == null) {
        return right == null;
      } else {
  
        return right != null &&
            (left.hasSystem()
             ? left.getSystem().equals(right.getSystem())
             : !right.hasSystem()) &&
            (left.hasCode()
             ? left.getCode().equals(right.getCode())
             : !right.hasCode()) &&
            (!left.hasVersion() || !right.hasVersion() || left.getVersion()
                .equals(right.getVersion()));
      }
    }
  }
  