/**
* Prints a usage message to the given stream.
*
* @param out The output stream to write to.
*/
public void printUsage(OutputStream out) {
Formatter formatter = new Formatter(out);
Set<CommandLineOption> orderedOptions = new TreeSet<CommandLineOption>(new OptionComparator());
orderedOptions.addAll(optionsByString.values());
Map<String, String> lines = new LinkedHashMap<String, String>();
for (CommandLineOption option : orderedOptions) {
Set<String> orderedOptionStrings = new TreeSet<String>(new OptionStringComparator());
orderedOptionStrings.addAll(option.getOptions());
List<String> prefixedStrings = new ArrayList<String>();
for (String optionString : orderedOptionStrings) {
if (optionString.length() == 1) {
prefixedStrings.add("-" + optionString);
} else {
prefixedStrings.add("--" + optionString);
}
}
lines.put(GUtil.join(prefixedStrings, ", "), GUtil.elvis(option.getDescription(), ""));
}
int max = 0;
for (String optionStr : lines.keySet()) {
max = Math.max(max, optionStr.length());
}
for (Map.Entry<String, String> entry : lines.entrySet()) {
if (entry.getValue().length() == 0) {
formatter.format("%s%n", entry.getKey());
} else {
formatter.format("%-" + max + "s %s%n", entry.getKey(), entry.getValue());
}
}
formatter.flush();
}
