public static Properties newOptions(Properties props, String key)
    {
        Properties options = new Properties();

        String csv = props.getProperty(key);
        if (csv != null)
            addOptionsTo(options, COMMA.split(csv), props);

        return options;
    }
Returns an option ({@link Properties}) that contains the csv entries.
protostuff-compiler/src/main/java/io/protostuff/compiler/CompilerMain.java