private void checkSourceVersionCompatibility(Source source, Log log) {
            SourceVersion procSourceVersion = processor.getSupportedSourceVersion();

            if (procSourceVersion.compareTo(Source.toSourceVersion(source)) < 0 )  {
                log.warning("proc.processor.incompatible.source.version",
                            procSourceVersion,
                            processor.getClass().getName(),
                            source.name);
            }
        }