Method addOption

src/tools/ArgP.java:74–92

Registers an option in this argument parser. @param name The name of the option to recognize (e.g. --foo). @param meta The meta-variable to associate with the value of the option. @param help A short description of this option. @throws IllegalArgumentException if the given name was already u

(final String name,
                        final String meta,
                        final String help)

   * @throws IllegalArgumentException if any of the given strings is empty.
   */
  public void addOption(final String name,
                        final String meta,
                        final String help) {
    if (name.isEmpty()) {
      throw new IllegalArgumentException("empty name");
    } else if (name.charAt(0) != '-') {
      throw new IllegalArgumentException("name must start with a `-': " + name);
    } else if (meta != null && meta.isEmpty()) {
      throw new IllegalArgumentException("empty meta");
    } else if (help.isEmpty()) {
      throw new IllegalArgumentException("empty help");
    }
    final String[] prev = options.put(name, new String[] { meta, help });
    if (prev != null) {
      options.put(name, prev);  // Undo the `put' above.
      throw new IllegalArgumentException("Option " + name + " already defined"
                                         + " in " + this);
    }
  }

  /**
   * Registers an option that doesn't take a value in this argument parser.