家电自动化遥控器API项目
传统设计方案
package com.java.jikexueyuan.commandmode.device; //电灯 public class Light { //电灯的位置 String loc = ""; public Light(String loc) { this.loc = loc; } //开灯 public void On() { System.out.println(loc + " On"); } //关灯 public void Off() { System.out.println(loc + " Off"); } }
package com.java.jikexueyuan.commandmode.device; //音响 public class Stereo { static int volume = 0; //开 public void On() { System.out.println("Stereo On"); } //关 public void Off() { System.out.println("Stereo Off"); } //选歌曲 public void SetCd() { System.out.println("Stereo SetCd"); } //设置音量 public void SetVol(int vol) { volume = vol; System.out.println("Stereo volume=" + volume); } //查看音量 public int GetVol() { return volume; } //开始播放 public void Start() { System.out.println("Stereo Start"); } }
package com.java.jikexueyuan.commandmode; //遥控器 public interface Control { //开机按钮 public void onButton(int slot); //关机按钮 public void offButton(int slot); public void undoButton(); }
package com.java.jikexueyuan.commandmode; import com.java.jikexueyuan.commandmode.device.Light; import com.java.jikexueyuan.commandmode.device.Stereo; //遥控器实现类 public class TraditionControl implements Control { Light light; Stereo stereo; public TraditionControl(Light light, Stereo stereo) { this.light = light; this.stereo = stereo; } @Override public void onButton(int slot) { // TODO Auto-generated method stub switch (slot) { case 0: light.On(); break; case 1: stereo.On(); break; case 2: int vol = stereo.GetVol(); if (vol < 11) { stereo.SetVol(++vol); } break; } } @Override public void offButton(int slot) { // TODO Auto-generated method stub switch (slot) { case 0: light.Off(); break; case 1: stereo.Off(); break; case 2: int vol = stereo.GetVol(); if (vol > 0) { stereo.SetVol(--vol); } break; } } @Override public void undoButton() { // TODO Auto-generated method stub } }
package com.java.jikexueyuan.commandmode; import com.java.jikexueyuan.commandmode.device.Light; import com.java.jikexueyuan.commandmode.device.Stereo; //使用遥控器 public class ControlTest { public static void main(String[] args) { Control ctl; Light light = new Light("Bedroom"); Stereo stereo = new Stereo(); ctl = new TraditionControl(light, stereo); ctl.onButton(0); ctl.offButton(0); ctl.onButton(1); ctl.onButton(2); ctl.offButton(2); ctl.offButton(1); } }
命令模式：将请求、命令、动作等封装成对象，这样可以让项目使用这些对象来参数化其他对象。使得命令的请求者和执行者解耦
重新设计如下
package com.java.jikexueyuan.commandmode.command; //所有命令的接口 public interface Command { public void execute(); public void undo(); }
package com.java.jikexueyuan.commandmode.command; import com.java.jikexueyuan.commandmode.device.Light; //开灯 public class LightOnCommand implements Command { private Light light; public LightOnCommand(Light light) { this.light=light; } @Override public void execute() { // TODO Auto-generated method stub light.On(); } @Override public void undo() { // TODO Auto-generated method stub light.Off(); } }
package com.java.jikexueyuan.commandmode.command; import com.java.jikexueyuan.commandmode.device.Light; //关灯 public class LightOffCommand implements Command { private Light light; public LightOffCommand(Light light) { this.light=light; } @Override public void execute() { // TODO Auto-generated method stub light.Off(); } @Override public void undo() { // TODO Auto-generated method stub light.On(); } }
package com.java.jikexueyuan.commandmode.command; import com.java.jikexueyuan.commandmode.device.Stereo; //打开音响，并选择歌曲 public class StereoOnCommand implements Command { private Stereo setreo; public StereoOnCommand(Stereo setreo) { this.setreo=setreo; } @Override public void execute() { // TODO Auto-generated method stub setreo.On(); setreo.SetCd(); } @Override public void undo() { // TODO Auto-generated method stub setreo.Off(); } }
package com.java.jikexueyuan.commandmode.command; //空指令 public class NoCommand implements Command { @Override public void execute() { // TODO Auto-generated method stub } @Override public void undo() { // TODO Auto-generated method stub } }
package com.java.jikexueyuan.commandmode.command; import java.util.Stack; import com.java.jikexueyuan.commandmode.Control; import com.java.jikexueyuan.commandmode.device.Light; import com.java.jikexueyuan.commandmode.device.Stereo; //遥控器实现类 public class CommandModeControl implements Control{ private Command[] onCommands; private Command[] offCommands; //使用栈 设置回退 private Stack<Command> stack=new Stack<Command>(); public CommandModeControl() { //假设左右各5个按钮 onCommands=new Command[5]; offCommands=new Command[5]; Command noCommand=new NoCommand(); for(int i=0,len=onCommands.length;i<len;i++) { //初始化按钮为未设置命令 onCommands[i]=noCommand; offCommands[i]=noCommand; } } //为指定按钮设置命令 public void setCommand(int slot,Command onCommand,Command offCommand) { onCommands[slot]=onCommand; offCommands[slot]=offCommand; } //点击on按钮 @Override public void onButton(int slot) { onCommands[slot].execute(); stack.push(onCommands[slot]); } //点击off按钮 @Override public void offButton(int slot) { offCommands[slot].execute(); stack.push(offCommands[slot]); } @Override public void undoButton() { // TODO Auto-generated method stub //返回在这个堆栈的顶部的对象--最后一次操作的对象 stack.pop().undo(); } }
package com.java.jikexueyuan.commandmode.command; //宏命令 public class MarcoCommand implements Command { private Command[] commands; //初始化多个命令给宏命令 public MarcoCommand(Command[] commands) { this.commands = commands; } @Override public void execute() {//执行时把所有初始化的命令全部执行 // TODO Auto-generated method stub for (int i = 0, len = commands.length; i < len; i++) { commands[i].execute(); } } @Override public void undo() { // TODO Auto-generated method stub for (int i = commands.length - 1; i >= 0; i--) { commands[i].undo(); } } }
package com.java.jikexueyuan.commandmode.command; import com.java.jikexueyuan.commandmode.Control; import com.java.jikexueyuan.commandmode.TraditionControl; import com.java.jikexueyuan.commandmode.device.Light; import com.java.jikexueyuan.commandmode.device.Stereo; public class ControlTest { //按钮设置和点击演示 public static void main(String[] args) { CommandModeControl control = new CommandModeControl(); MarcoCommand onmarco,offmarco; Light bedroomlight = new Light("BedRoom"); Light kitchlight = new Light("Kitch"); Stereo stereo = new Stereo(); LightOnCommand bedroomlighton = new LightOnCommand(bedroomlight); LightOffCommand bedroomlightoff = new LightOffCommand(bedroomlight); LightOnCommand kitchlighton = new LightOnCommand(kitchlight); LightOffCommand kitchlightoff = new LightOffCommand(kitchlight); Command[] oncommands={bedroomlighton,kitchlighton}; Command[] offcommands={bedroomlightoff,kitchlightoff}; onmarco=new MarcoCommand(oncommands); offmarco=new MarcoCommand(offcommands); StereoOnCommand stereoOn = new StereoOnCommand(stereo); StereoOffCommand stereoOff = new StereoOffCommand(stereo); StereoAddVolCommand stereoaddvol = new StereoAddVolCommand(stereo); StereoSubVolCommand stereosubvol = new StereoSubVolCommand(stereo); control.setCommand(0, bedroomlighton, bedroomlightoff); control.setCommand(1, kitchlighton, kitchlightoff); control.setCommand(2, stereoOn, stereoOff); control.setCommand(3, stereoaddvol, stereosubvol); control.setCommand(4, onmarco, offmarco); control.onButton(0); control.undoButton(); //control.offButton(0); control.onButton(1); control.offButton(1); control.onButton(2); control.onButton(3); control.offButton(3); control.undoButton(); control.offButton(2); control.undoButton(); control.onButton(4); control.offButton(4); } }