2 * Svjatoslav Commons - shared library of common functionality.
3 * Copyright ©2012-2014, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 3 of the GNU Lesser General Public License
7 * or later as published by the Free Software Foundation.
10 package eu.svjatoslav.commons.commandline.parameterparser;
12 import java.util.ArrayList;
16 * Single commandline parameter can have any amount of arguments.
21 private final ArrayList<Parameter> parameters = new ArrayList<Parameter>();
23 public <E extends Parameter> E add(final E parameter) {
24 parameters.add(parameter);
29 * Return parameter by given alias or <code>null</code> if no parameter
30 * exists for given alias.
32 public Parameter findParameterByAlias(final String alias) {
34 for (final Parameter parameter : parameters)
35 if (parameter.matchesAlias(alias))
42 * @return <code>true</code> if no errors were found. <code>false</code>
45 public boolean parse(final String[] args) {
47 Parameter currentParameter = null;
49 for (final String argument : args) {
51 final Parameter parameterForAlias = findParameterByAlias(argument);
52 if (parameterForAlias == null) {
53 if (currentParameter == null) {
54 System.out.println("Unknown commandline parameter: "
59 if (!currentParameter.addArgument(argument))
63 if (currentParameter != null)
64 if (!currentParameter.noMoreArguments())
67 parameterForAlias.setParameterSpecified(true);
68 currentParameter = parameterForAlias;
73 // check if any mandatory parameters are missing
75 for (final Parameter parameter : parameters)
76 if (parameter.isMandatory() && (!parameter.isParameterSpecified())) {
77 System.out.println("Error! Mandatory parameter ("
78 + parameter.getAliases() + ") is not specified.");
85 public void showHelp() {
86 for (final Parameter parameter : parameters)
87 System.out.println(parameter.getHelp());