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Commit 5c53088

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author
Badacadabra
committed
Add Adapter (ES5 + ES6 + CoffeeScript)
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‎doc/GoF/Structural/Adapter/Adapter.dia

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‎doc/GoF/Structural/Adapter/Adapter.png

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‎doc/GoF/Structural/Adapter/README.md

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# Synopsis
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I have some amazing photos on my computer that I would like to display using my old projector. But my PC uses HDMI and my projector uses VGA.
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# Problem
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HDMI and VGA are not compatible interfaces. HDMI can handle images and sound through a digital signal whereas VGA can only handle images through an analog signal.
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# Solution
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Adapter is a well-known solution in this kind of situation. We need:
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* Abstract representations (generally interfaces) of the problem. Here we easily see that a digital interface is not compatible with an analog one.
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* Concrete implementations of these abstractions: e.g. HDMIToVGAAdapter & VGA. Here the adapter should be able to delegate some work to the adapted entity.
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"use strict"
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# ==============================
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# ABSTRACT CONNECTIONS
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# ==============================
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class AnalogInterface
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constructor: ->
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throw new Error "You cannot instantiate an abstract class!" if @constructor is AnalogInterface
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handleAnalogSignal: ->
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throw new Error "You cannot call an abstract method!"
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class DigitalInterface
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constructor: ->
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throw new Error "You cannot instantiate an abstract class!" if @constructor is DigitalInterface
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handleDigitalSignal: ->
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throw new Error "You cannot call an abstract method!"
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# ==============================
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# CONCRETE CONNECTIONS
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# ==============================
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# VGA has its own interface which handles images only through an analog signal
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class VGA extends AnalogInterface
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handleAnalogSignal: ->
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"Interface: VGA\nData: images\nSignal: analog\n"
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# But your computer uses HDMI as output and your projector uses VGA as input...
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# Here you need an adapter if you want to display images. The two interfaces are incompatible.
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class HDMIToVGAAdapter extends DigitalInterface
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constructor: ->
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@_vga = new VGA
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handleDigitalSignal: ->
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@_vga.handleAnalogSignal()
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# ==============================
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# CLIENT CODE
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# ==============================
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adapter = new HDMIToVGAAdapter
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console.log adapter.handleDigitalSignal() # Your computer uses HDMI and your projetor uses VGA
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'use strict';
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// ==============================
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// ABSTRACT CONNECTIONS
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// ==============================
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var AnalogInterface = (function () {
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function AnalogInterface() {
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if (this.constructor === AnalogInterface) {
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throw new Error("You cannot instantiate an abstract class!");
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}
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}
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AnalogInterface.prototype.handleDigitalSignal = function () {
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throw new Error("You cannot call an abstract method!");
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};
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return AnalogInterface;
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})();
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var DigitalInterface = (function () {
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function DigitalInterface() {
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if (this.constructor === DigitalInterface) {
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throw new Error("You cannot instantiate an abstract class!");
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}
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}
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DigitalInterface.prototype.handleDigitalSignal = function () {
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throw new Error("You cannot call an abstract method!");
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};
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return DigitalInterface;
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})();
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// ==============================
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// CONCRETE CONNECTIONS
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// ==============================
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// VGA has its own interface which handles images only through an analog signal
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var VGA = (function () {
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var name = "VGA",
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data = "images",
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signal = "analog";
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function VGA() {}
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VGA.prototype = Object.create(AnalogInterface.prototype);
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VGA.prototype.constructor = VGA;
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VGA.prototype.handleAnalogSignal = function () {
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return "Interface: " + name + "\nData: " + data + "\nSignal: " + signal;
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};
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return VGA;
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})();
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// But your computer uses HDMI as output and your projector uses VGA as input...
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// Here you need an adapter if you want to display images. The two interfaces are incompatible.
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var HDMIToVGAAdapter = (function () {
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var vga = new VGA();
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function HDMIToVGAAdapter() {}
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HDMIToVGAAdapter.prototype = Object.create(DigitalInterface.prototype);
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HDMIToVGAAdapter.prototype.constructor = HDMIToVGAAdapter;
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HDMIToVGAAdapter.prototype.handleDigitalSignal = function () {
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return vga.handleAnalogSignal();
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};
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return HDMIToVGAAdapter;
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})();
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// ==============================
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// CLIENT CODE
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// ==============================
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var adapter = new HDMIToVGAAdapter();
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console.log(adapter.handleDigitalSignal()); // Your computer uses HDMI and your projector uses VGA
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// ==============================
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// ABSTRACT CONNECTIONS
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// ==============================
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class AnalogInterface {
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constructor() {
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if (new.target !== undefined) {
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throw new Error("You cannot instantiate an abstract class!");
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}
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}
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handleAnalogSignal() {
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throw new Error("You cannot call an abstract method!");
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}
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}
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class DigitalInterface {
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constructor() {
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if (new.target !== undefined) {
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throw new Error("You cannot instantiate an abstract class!");
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}
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}
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handleDigitalSignal() {
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throw new Error("You cannot call an abstract method!");
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}
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}
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// ==============================
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// CONCRETE CONNECTIONS
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// ==============================
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// VGA has its own interface which handles images only through an analog signal
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class VGA extends AnalogInterface {
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handleAnalogSignal() {
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return "Interface: VGA\nData: images\nSignal: analog\n";
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}
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}
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// But your computer uses HDMI as output and your projector uses VGA as input...
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// Here you need an adapter if you want to display images. The two interfaces are incompatible.
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class HDMIToVGAAdapter extends DigitalInterface {
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constructor() {
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super();
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this._vga = new VGA();
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}
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handleDigitalSignal() {
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return this._vga.handleAnalogSignal();
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}
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}
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// ==============================
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// CLIENT CODE
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// ==============================
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var adapter = new HDMIToVGAAdapter();
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console.log(adapter.handleDigitalSignal()); // Your computer uses HDMI and your projector uses VGA

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