class TransformationMetadataCacheKey implements ContentCacheKey {

    @Override
    public String getKey() {
        return PREFIX + "_" + preparationId + "_" + stepId + "_" + sourceType + "_" + userId;
    }

      TransformationMetadataCacheKey(final String preparationId, final String stepId,
            final ExportParameters.SourceType sourceType, final String userId);

}