buildCommandArgumentContext

val context = buildCommandArgumentContext {
    Int::class with IntArgParser
    Member::class with ExistingMemberArgParser
    Group::class with { s: String, sender: CommandSender ->
         Bot.getInstance(s.toLong()).getGroup(s.toLong())
    }
    Bot::class with { s: String ->
         Bot.getInstance(s.toLong())
    }
}

CommandArgumentContext context =
    new CommandArgumentContextBuilder()
        .add(clazz1, parser1)
        .add(String.class, new CommandArgumentParser<String>() {
             public String parse(String raw, CommandSender sender) {
                 // ...
             }
        })
        // 更多 add
        .build()