this.shortNames = new HashMap<String, OptionDescription>();
for(String key : this.descriptions.keySet()) {
OptionDescription desc = this.descriptions.get(key);
if (!desc.shortOptionName.equals("")) {
if (this.shortNames.get(desc.shortOptionName) != null) {
throw new DuplicateOptionException("More than one field " +
"defines shortName " + desc.shortOptionName + ".");
}
this.shortNames.put(desc.shortOptionName, desc);
}
}