Spring SimpleCommandLinePropertySource

class CommandLineArgs {

   /**
    * 选项参数列表
    */
   private final Map<String, List<String>> optionArgs = new HashMap<>();

   /**
    * 非选项参数列表
    */
   private final List<String> nonOptionArgs = new ArrayList<>();

   /**
    * Add an option argument for the given option name and add the given value to the
    * list of values associated with this option (of which there may be zero or more).
    * The given value may be {@code null}, indicating that the option was specified
    * without an associated value (e.g. "--foo" vs. "--foo=bar").
    *
    * 添加 选项参数
    */
   public void addOptionArg(String optionName, @Nullable String optionValue) {
      if (!this.optionArgs.containsKey(optionName)) {
         this.optionArgs.put(optionName, new ArrayList<>());
      }
      if (optionValue != null) {
         this.optionArgs.get(optionName).add(optionValue);
      }
   }

   /**
    * Return the set of all option arguments present on the command line.
    * 获取选项参数列表
    */
   public Set<String> getOptionNames() {
      return Collections.unmodifiableSet(this.optionArgs.keySet());
   }

   /**
    * Return whether the option with the given name was present on the command line.
    */
   public boolean containsOption(String optionName) {
      return this.optionArgs.containsKey(optionName);
   }

   /**
    * Return the list of values associated with the given option. {@code null} signifies
    * that the option was not present; empty list signifies that no values were associated
    * with this option.
    */
   @Nullable
   public List<String> getOptionValues(String optionName) {
      return this.optionArgs.get(optionName);
   }

   /**
    * Add the given value to the list of non-option arguments.
    */
   public void addNonOptionArg(String value) {
      this.nonOptionArgs.add(value);
   }

   /**
    * Return the list of non-option arguments specified on the command line.
    */
   public List<String> getNonOptionArgs() {
      return Collections.unmodifiableList(this.nonOptionArgs);
   }

}