1.描写叙述：
又是一个周三,快要下班了,老大突然又拉住我,喜滋滋的告诉我“牛叉公司非常惬意我们做的模型,又签订了一个合同,把奔驰、宝马的车辆模型都交给我我们公司制作了,只是这次又额外添加了一个新需求:汽车的启动、停止、喇叭声音、引擎声音都有客户自己控制,他想什么顺序就什么顺序,这个没问题吧?”。 看着老大殷切的目光,我还能说啥,肯定的点头,“没问题!”,加班加点做呗,“再苦再累就当自己二百五 再难再险就当自己二皮脸 与君共勉!”这句话说出了我的心声。那任务是接下来,我们怎么做实现呢?首先我们想了,奔驰、宝马都是一个产品,他们有共同拥有的属性,牛叉公司关心的是单个模型,奔驰模型 A 是先有引擎声音,然后再启动;奔驰模型 B 呢是先启动起来,然后再有引擎声音,这才是牛叉公司要关关心的,那到我们老大这边呢,就是满足人家的要求,要什么顺序就立刻能产生什么顺序的模型出来,我呢就负责把老大的要求实现掉,并且还要是批量的,看不懂?没关系,继续看下去,首先由我生产出 N多个奔驰和宝马车辆模型,这些车辆模型的都有 run 方法,可是详细到每个模型的 run 方法可能中间的执行任务的顺序是不同的,老大说要啥顺序,我就给啥顺序,终于客户买走后仅仅能是既定的模型。先看类图:
2.代码：
require "class"-------- CarModel --------CarModel = class()function CarModel:ctor() self.m_pSequence = {}endfunction CarModel:Start() print("CarModel Start")endfunction CarModel:Stop() print("CarModel Stop")endfunction CarModel:Alarm() print("CarModel Alarm")endfunction CarModel:EngineBoom() print("CarModel EngineBoom")endfunction CarModel:SetSequence(pSeq) self.m_pSequence = pSeqendfunction CarModel:Run() if self.m_pSequence then for _,v in pairs(self.m_pSequence) do if v == "start" then self:Start() elseif v == "stop" then self:Stop() elseif v == "alarm" then self:Alarm() elseif v == "engineBoom" then self:EngineBoom() end end endend-------- BenzModel --------BenzModel = class(CarModel)function BenzModel:Start() print("奔驰发动...")endfunction BenzModel:Stop() print("奔驰停车...")endfunction BenzModel:Alarm() print("奔驰鸣笛")endfunction BenzModel:EngineBoom() print("奔驰引擎声音是这样....")end-------- BMWModel --------BMWModel = class(CarModel)function BMWModel:Start() print("宝马发动...")endfunction BMWModel:Stop() print("宝马停车...")endfunction BMWModel:Alarm() print("宝马鸣笛")endfunction BMWModel:EngineBoom() print("宝马引擎声音是这样....")end------------------------------------- ICarBuilder -------------------------------------ICarBuilder = class()function ICarBuilder:SetSequence(pseq)endfunction ICarBuilder:GetCarModel()end-------- BenzBuilder --------BenzBuilder = class(ICarBuilder)function BenzBuilder:ctor() self.m_pBenz = BenzModel.new()endfunction BenzBuilder:clear() print("BenzBuilder:clear") self.m_pBenz = nilendfunction BenzBuilder:SetSequence(pSeq) self.m_pBenz:SetSequence(pSeq)endfunction BenzBuilder:GetCarModel() return self.m_pBenzend-------- BMWBuilder --------BMWBuilder = class(ICarBuilder)function BMWBuilder:ctor() --print("BenzBuilder:ctor") self.m_pBMW = BMWModel.new()endfunction BMWBuilder:clear() self.m_pBMW = nilendfunction BMWBuilder:SetSequence(pSeq) self.m_pBMW:SetSequence(pSeq)endfunction BMWBuilder:GetCarModel() return self.m_pBMWend--[[A 型号的奔驰车辆模型是仅仅有启动(start)、停止(stop)方法,其它的引擎声音、喇叭都没有;B 型号的奔驰车是先发动引擎(engine boom),然后启动(star),再然后停车(stop),没有喇叭;C 型号的宝马车是先喇叭叫一下(alarm),然后(start),再然后是停车(stop),引擎不轰鸣;D 型号的宝马车就一个启动(start),然后一路跑到黑,永动机,没有停止方法,没有喇叭,没有引擎轰鸣;E 型号、F 型号...等等,能够有非常多,启动(start)、停止(stop)、喇叭(alarm)、引擎轰鸣(engine boom)]]---------------------------------- Director ----------------------------------Director = class()function Director:ctor() self.m_pSeqence = {} self.m_pBenzBuilder = BenzBuilder.new() self.m_pBMWBuilder = BMWBuilder.new()endfunction Director:clear() self.m_pSeqence = {} self.m_pBenzBuilder = nil self.m_pBMWBuilder = nilend-- A 型号的奔驰车function Director:GetABenzModel() print("--------A 型号的奔驰车--------") self.m_pSeqence = {} table.insert(self.m_pSeqence, "start") table.insert(self.m_pSeqence, "stop") self.m_pBenzBuilder:SetSequence(self.m_pSeqence) return self.m_pBenzBuilder:GetCarModel()end-- B 型号的奔驰车function Director:GetBBenzModel() print("--------B 型号的奔驰车--------") self.m_pSeqence = {} table.insert(self.m_pSeqence, "engineBoom") table.insert(self.m_pSeqence, "start") table.insert(self.m_pSeqence, "stop") self.m_pBenzBuilder:SetSequence(self.m_pSeqence) return self.m_pBenzBuilder:GetCarModel()end-- C 型号的宝马车function Director:GetCBMWModel() print("--------C 型号的宝马车--------") self.m_pSeqence = {} table.insert(self.m_pSeqence, "alarm") table.insert(self.m_pSeqence, "start") table.insert(self.m_pSeqence, "stop") self.m_pBMWBuilder:SetSequence(self.m_pSeqence) return self.m_pBMWBuilder:GetCarModel()end-- D 型号的宝马车function Director:GetDBMWModel() print("--------D 型号的宝马车--------") self.m_pSeqence = {} table.insert(self.m_pSeqence, "start") self.m_pBMWBuilder:SetSequence(self.m_pSeqence) return self.m_pBMWBuilder:GetCarModel()end--- main ---function main() director = Director.new() director:GetABenzModel():Run() director:GetBBenzModel():Run() director:GetCBMWModel():Run() director:GetDBMWModel():Run()endmain() 执行结果例如以下：
