docs: public ArchiveCoordinateModel getSingleOrCreate(String groupId, String artifactId, String version)
      {
          ArchiveCoordinateModel archive = findSingle(groupId, artifactId, version);
          if (archive != null)
              return archive;
          else
              return create().setGroupId(groupId).setArtifactId(artifactId).setVersion(version);
      }