protected static String getVar(Map<String, String> optionsMap, String varName) {
        if (optionsMap.get(varName) == null || optionsMap.get(varName).isEmpty()) {
            return null;
        }
        return optionsMap.get(varName);
    }
Called to parse a map into a set of specific options.
@param options the option map
common/config/src/main/java/io/apiman/common/config/options/AbstractOptions.java