DebugLog.log("parsing revision: " + revStr);
    protected static SVNRevision parseRevision(SVNCommandLine commandLine) {        if (commandLine.hasArgument(SVNArgument.REVISION)) {            final String revStr = (String) commandLine.getArgumentValue(SVNArgument.REVISION);            DebugLog.log("parsing revision: " + revStr);            return SVNRevision.parse(revStr);        }        return SVNRevision.UNDEFINED;    }