added Command

Author: nicolabovolato

behavioral/command/App.ts

@@ -0,0 +1,37 @@
+import { Television } from "./Television";
+import { Remote } from "./Remote";
+import { VolumeUpCommand, VolumeDownCommand, ChannelUpCommand, ChannelDownCommand } from "./Commands";
+
+export default class CommandEx {
+
+    tv: Television;
+    remote: Remote;
+
+    constructor(){
+
+        this.tv = new Television();
+        this.remote = this.configure();
+        this.run();
+    }
+
+    configure(): Remote {
+        let command1 = new VolumeUpCommand(this.tv); 
+        let command2 = new VolumeDownCommand(this.tv); 
+        let command3 = new ChannelUpCommand(this.tv); 
+        let command4 = new ChannelDownCommand(this.tv);
+
+        let remote = new Remote();
+
+        remote.add(command1);
+        remote.add(command2);
+        remote.add(command3);
+        remote.add(command4);
+
+        return remote;
+    }
+
+    run(): void {
+
+        this.remote.pushButtons();
+    }
+}

behavioral/command/Commands.ts

@@ -0,0 +1,74 @@
+import { Television } from "./Television";
+
+export interface Command {
+
+    execute(): void;
+}
+
+export class VolumeUpCommand implements Command {
+
+    tv: Television;
+
+    constructor(_tv: Television){
+
+        this.tv = _tv;
+    }
+
+    execute(): void {
+
+        console.log("Turning volume up");
+        this.tv.operation("volup");
+        console.log(`Volume is now ${this.tv.getVolume()}`)
+    }
+}
+
+export class VolumeDownCommand implements Command {
+
+    tv: Television;
+
+    constructor(_tv: Television){
+
+        this.tv = _tv;
+    }
+
+    execute(): void {
+        
+        console.log("Turning volume down");
+        this.tv.operation("voldown");
+        console.log(`Volume is now ${this.tv.getVolume()}`)
+    }
+}
+
+export class ChannelUpCommand implements Command {
+
+    tv: Television;
+
+    constructor(_tv: Television){
+
+        this.tv = _tv;
+    }
+
+    execute(): void {
+
+        console.log("Turning channel up");
+        this.tv.operation("chup");
+        console.log(`Channel is now ${this.tv.getChannel()}`)
+    }
+}
+
+export class ChannelDownCommand implements Command {
+
+    tv: Television;
+
+    constructor(_tv: Television){
+
+        this.tv = _tv;
+    }
+
+    execute(): void {
+        
+        console.log("Turning channel down");
+        this.tv.operation("chdown");
+        console.log(`Channel is now ${this.tv.getChannel()}`)
+    }
+}

behavioral/command/Remote.ts

@@ -0,0 +1,15 @@
+import { Command } from "./Commands";
+
+export class Remote {
+
+    commands: Command[] = [];
+
+    add(command: Command): void {
+        this.commands.push(command);
+    }
+
+    pushButtons(): void {
+        this.commands.forEach((command: Command) => command.execute());
+        this.commands = [];
+    }
+}

behavioral/command/Television.ts

@@ -0,0 +1,39 @@
+export class Television {
+
+    private volume: number = 20;
+    private channel: number = 1;
+
+    operation(opcode: string): void{
+
+        switch(opcode){
+
+            case "volup":
+
+                if(this.volume < 100) this.volume += 10;
+                break;
+
+            case "voldown":
+
+                if(this.volume > 0) this.volume -= 10;
+                break;
+
+            case "chup":
+
+                if(this.channel < 999) this.channel++;
+                break;
+
+            case "chdown":
+
+                if(this.channel > 1) this.channel--;
+                break;
+        }
+    }
+
+    getVolume(): number {
+        return this.volume;
+    }
+
+    getChannel(): number {
+        return this.channel;
+    }
+}