命令 Handler/Parser 用于铁路模拟

Command Handler/Parser for a railway simulation

I am trying to find a good way to create a user interface for my railway simulation.

For now, I have created a "Command" interface with the methods execute, getName, getArguments and then I created a class for each command (AddTrack, DeleteTrack, ..., Exit). However, I am still struggling with a good way to get all arguments, handling wrong inputs etc. Does someone have a better idea for my UI or can give me some basic structure for it?

Here is the list of all commands that I want to implement:

 - add track <startpoint> -> <endpoint>
 - delete track <trackID>
 - list tracks
 - set switch <trackID> position <point>
 - create engine <engineType> <class> <name> <length> <couplingFront> <couplingBack>
 - list engines
 - create coach <coachType> <length> <couplingFront> <couplingBack>
 - list coaches
 - create train-set <class> <name> <length> <couplingFront> <couplingBack>
 - list train-sets
 - delete rolling stock <id>
 - add train <trainID> <rollingStockID>
 - list trains
 - show train <trainID>
 - put train <trainID> at <point> in direction <x>,<y>
 - step <speed>
 - exit

将它们全部放在同一个方法中可能是一种不好的做法。这就是为什么我的计划是为每个命令创建一个新的 class。

我的问题是我不确定如何识别这些命令,因为有些命令由一个词组成(如退出、步骤),有些则由两个词组成(添加曲目、删除曲目、设置开关)。您是否建议为所有添加命令(添加轨道、添加列车等)、列表命令(列出轨道、列表引擎等)等创建一个 class?

如果您只想创建一个命令行工具,我会创建一些与 'menu'(命令处理)相关的特定 class,然后为特定的 classes特定领域(与火车、轨道、引擎等相关的事物)。

所以你最终可能会有一些臃肿的命令处理来保存一些状态(比如我们在 cli-app 中的位置),让用户 select 某种状态(如果他想操纵轨道、火车或查看有关引擎的信息)。所有这些东西都在一个(或几个)菜单 classes 中处理。这个 class 负责保存状态和 'navigate' 用户(这意味着调用其他 classes 和方法)。