{"id":334,"date":"2019-11-01T13:50:07","date_gmt":"2019-11-01T13:50:07","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=334"},"modified":"2019-12-27T16:37:24","modified_gmt":"2019-12-27T16:37:24","slug":"adapter-design-pattern-go","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/adapter-design-pattern-go\/","title":{"rendered":"Adapter Design Pattern in Go (GoLang)"},"content":{"rendered":"\n<p class=\"has-medium-font-size\">Note: Interested in understanding how all other design patterns can be implemented in GO. Please see this full reference  &#8211; <a href=\"https:\/\/golangbyexamples.com\/all-design-patterns-golang\/\">All Design Patterns in Go (Golang)<\/a><\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_17 counter-hierarchy counter-decimal ez-toc-light-blue\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/golangbyexamples.com\/adapter-design-pattern-go\/#Introduction\" title=\"Introduction: \">Introduction: <\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/golangbyexamples.com\/adapter-design-pattern-go\/#When_to_Use\" title=\"When to Use\">When to Use<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/golangbyexamples.com\/adapter-design-pattern-go\/#UML_Diagram\" title=\"UML Diagram\">UML Diagram<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/golangbyexamples.com\/adapter-design-pattern-go\/#Mapping\" title=\"Mapping&nbsp;\">Mapping&nbsp;<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/golangbyexamples.com\/adapter-design-pattern-go\/#Example\" title=\"Example:\">Example:<\/a><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Introduction\"><\/span><strong>Introduction: <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">This design pattern is a Structural Design Pattern. The patter is best understood with an example. Let&#8217;s say you have two laptops<br><\/p>\n\n\n\n<ol class=\"has-medium-font-size wp-block-list\"><li>MacBook Pro<\/li><li>Windows Laptop<\/li><\/ol>\n\n\n\n<p class=\"has-medium-font-size\">MacBook Pro has a USB port that is <strong>square<\/strong> in shape and Windows have a USB port that is <strong>circular<\/strong> in shape. You as a client have a USB cable that is square in shape so it can only be inserted in the mac laptop. So you see the problem here<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Problem:<\/strong><\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>We have a class (Client) that is expecting some features of an object (square USB port here), but we have another object called adaptee (Windows Laptop here) which offers the same functionality but through a different interface( circular port)<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">This is where Adapter Pattern comes into the picture. We create a class known as Adapter that will <\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Adhere to the same interface which client expects ( Square USB port here)<\/li><li>Translate the request from the client to the adaptee in the form that adaptee expects. Basically, in our example act as an adapter that accepts USB in square port and then inserts into circular port in windows laptop.<\/li><\/ul>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"When_to_Use\"><\/span><strong>When to Use<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Use this design pattern when the objects implement a different interface as required by the client. <\/li><\/ul>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"UML_Diagram\"><\/span><strong>UML Diagram<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"561\" height=\"421\" src=\"https:\/\/i1.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2019\/11\/Adapter-Design-Pattern-1.jpg?resize=561%2C421&#038;ssl=1\" alt=\"\" class=\"wp-image-469\" srcset=\"https:\/\/i1.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2019\/11\/Adapter-Design-Pattern-1.jpg?w=561&amp;ssl=1 561w, https:\/\/i1.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2019\/11\/Adapter-Design-Pattern-1.jpg?resize=300%2C225&amp;ssl=1 300w\" sizes=\"auto, (max-width: 561px) 100vw, 561px\" data-recalc-dims=\"1\" \/><\/figure>\n\n\n\n<p class=\"has-medium-font-size\">Below is the corresponding mapping UML diagram with the example given above<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"581\" height=\"421\" src=\"https:\/\/i2.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2019\/11\/Adapter-Design-Pattern-2.jpg?resize=581%2C421&#038;ssl=1\" alt=\"\" class=\"wp-image-470\" srcset=\"https:\/\/i1.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2019\/11\/Adapter-Design-Pattern-2.jpg?w=581&amp;ssl=1 581w, https:\/\/i1.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2019\/11\/Adapter-Design-Pattern-2.jpg?resize=300%2C217&amp;ssl=1 300w\" sizes=\"auto, (max-width: 581px) 100vw, 581px\" data-recalc-dims=\"1\" \/><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Mapping\"><\/span><strong>Mapping&nbsp;<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\"><br>The below table represents the mapping from the UML diagram actors to actual implementation actors in code.<br><\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-subtle-pale-blue-background-color has-background\"><tbody><tr><td>Target<\/td><td>computer.go<\/td><\/tr><tr><td>Concrete Prototype 1<\/td><td>mac.go<\/td><\/tr><tr><td>Concrete Prototype 2 (Adapter)<\/td><td>windowsAdapter.go<\/td><\/tr><tr><td>adaptee<\/td><td>windows.go<\/td><\/tr><tr><td>client<\/td><td>client.go<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Example\"><\/span><strong>Example<\/strong>:<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\"><strong>computer.go<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\ntype computer interface {\n    insertInSquarePort()\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>mac.go<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport \"fmt\"\n\ntype mac struct {\n}\n\nfunc (m *mac) insertInSquarePort() {\n    fmt.Println(\"Insert square port into mac machine\")\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>windowsAdapter.go<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\ntype windowsAdapter struct {\n\twindowMachine *windows\n}\n\nfunc (w *windowsAdapter) insertInSquarePort() {\n\tw.windowMachine.insertInCirclePort()\n}\n<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>windows.go<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport \"fmt\"\n\ntype windows struct{}\n\nfunc (w *windows) insertInCirclePort() {\n    fmt.Println(\"Insert circle port into windows machine\")\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>client.go<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\ntype client struct {\n}\n\nfunc (c *client) insertSquareUsbInComputer(com computer) {\n    com.insertInSquarePort()\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>main.go<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nfunc main() {\n    client := &client{}\n    mac := &mac{}\n    client.insertSquareUsbInComputer(mac)\n    windowsMachine := &windows{}\n    windowsMachineAdapter := &windowsAdapter{\n        windowMachine: windowsMachine,\n    }\n    client.insertSquareUsbInComputer(windowsMachineAdapter)\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">Insert square port into mac machine\nInsert circle port into windows machine<\/code><\/pre>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Note: Interested in understanding how all other design patterns can be implemented in GO. Please see this full reference &#8211; All Design Patterns in Go (Golang) Table of Contents Introduction: When to&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[1],"tags":[50,51,26,25],"class_list":["post-334","post","type-post","status-publish","format-standard","hentry","category-tech","tag-adapter","tag-adapter-design-pattern","tag-design","tag-design-pattern"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Adapter Design Pattern in Go (GoLang) - Welcome To Golang By Example<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/golangbyexamples.com\/adapter-design-pattern-go\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Adapter Design Pattern in Go (GoLang) - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"Note: Interested in understanding how all other design patterns can be implemented in GO. 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