2 * Svjatoslav Commons - shared library of common functionality. Author: Svjatoslav Agejenko.
3 * This project is released under Creative Commons Zero (CC0) license.
5 package eu.svjatoslav.commons.cli_helper.parameter_parser;
7 import java.util.ArrayList;
10 * Single commandline parameter can have any amount of arguments.
14 private final ArrayList<Option<?, ? extends Option>> options = new ArrayList<>();
16 public <E extends Option> E add(final E parameter) {
17 options.add(parameter);
22 * @return <code>true</code> if no errors were found. <code>false</code>
25 private boolean checkMandatoryArgumentsPresent() {
27 for (final Option option : options)
28 if (option.isMandatory() && (!option.isPresent())) {
29 System.out.println("Error! Mandatory parameter ("
30 + option.getAliasesAsString() + ") is not specified.");
38 * Return parameter by given alias or <code>null</code> if no parameter
39 * exists for given alias.
41 * @param alias parameter alias
42 * @return found parameter or <code>null</code> if parameter was not found.
44 public Option findParameterByAlias(final String alias) {
46 for (final Option option : options)
47 if (option.matchesAlias(alias))
54 * @param args commandline arguments
55 * @return <code>true</code> if no errors were found. <code>false</code>
58 public boolean parse(final String[] args) {
60 Option currentOption = null;
62 for (final String argument : args) {
64 final Option optionForAlias = findParameterByAlias(argument);
65 if (optionForAlias == null) {
66 if (currentOption == null) {
67 System.out.println("Unknown commandline parameter: "
72 if (!currentOption.addParameter(argument))
76 if (currentOption != null)
77 if (!currentOption.noMoreArguments())
80 optionForAlias.setPresent(true);
81 currentOption = optionForAlias;
86 return checkMandatoryArgumentsPresent();
89 public void showHelp() {
90 System.out.println("Available commandline arguments:");
91 for (final Option option : options)
92 System.out.println(option.getHelp());