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<Parameter<?, ? extends Parameter>> parameters = new ArrayList<>();
16 public <E extends Parameter> E add(final E parameter) {
17 parameters.add(parameter);
22 * @return <code>true</code> if no errors were found. <code>false</code>
25 private boolean checkMandatoryArgumentsPresent() {
27 for (final Parameter parameter : parameters)
28 if (parameter.isMandatory() && (!parameter.isSpecified())) {
29 System.out.println("Error! Mandatory parameter ("
30 + parameter.getAliases() + ") 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 Parameter findParameterByAlias(final String alias) {
46 for (final Parameter parameter : parameters)
47 if (parameter.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 Parameter currentParameter = null;
62 for (final String argument : args) {
64 final Parameter parameterForAlias = findParameterByAlias(argument);
65 if (parameterForAlias == null) {
66 if (currentParameter == null) {
67 System.out.println("Unknown commandline parameter: "
72 if (!currentParameter.addArgument(argument))
76 if (currentParameter != null)
77 if (!currentParameter.noMoreArguments())
80 parameterForAlias.setSpecified(true);
81 currentParameter = parameterForAlias;
86 return checkMandatoryArgumentsPresent();
89 public void showHelp() {
90 System.out.println("Available commandline arguments:");
91 for (final Parameter parameter : parameters)
92 System.out.println(parameter.getHelp());