[MEDIUM-ADVANCED] Java Challenge - Details Inside!

Task: Write an advanced command API.

Details:

• Must respond to an onCommand method using your classes to parse commands.
• Must parse commands accurately.
• Must have subcommand support.
• Must be efficient (anything that takes over half a second to parse a command from System.in with 50 commands, each with 1 subcommand does not pass. Use System.currentTimeMillis() ).
• Must have support for removing commands and removing subcommands from commands.
• Must act on null objects passed in.
• Must throw no exceptions not including (and even then they must be thrown by you not someone else): (this does not apply when it is impossible to catch the exception (when you do something that throws an exception in a super() or this() constructor for instance))
  • IllegalStateException
  • IllegalArgumentException
• Must check for commands being registered already and act on it if someone tries to register a command already registered.
• Must use no external APIs that aren't written by you. Write your own.
• Must have a command sender / source concept.

Mine is almost finished, will post in a second.