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Oktawian Chojnacki
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Protection Proxy + Virtual Proxy
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‎Design-Patterns.playground.zip

3.14 KB
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‎Design-Patterns.playground/Documentation/section-43.html

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<body>
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<div class="content-wrapper">
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<section class="section">
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<h2 id="-proxy">🚧 Proxy</h2>
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<h1 id="behavioral">Behavioral</h1>
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<blockquote>
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<p>In software engineering, behavioral design patterns are design patterns that identify common communication patterns between objects and realize these patterns. By doing so, these patterns increase flexibility in carrying out this communication.</p>
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<p><strong>Source:</strong> <a href="http://en.wikipedia.org/wiki/Behavioral_pattern">wikipedia.org</a></p>
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</blockquote>
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<h2 id="-chain-of-responsibility">🚧 Chain Of Responsibility</h2>
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<h2 id="-command">👫 Command</h2>
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<h2 id="-virtual-proxy">🍬 Virtual Proxy</h2>
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<p><strong>Source:</strong></p>
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</section>
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</div>

‎Design-Patterns.playground/Documentation/section-47.html

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<body>
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<div class="content-wrapper">
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<section class="section">
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<h2 id="-iterator">🚧 Iterator</h2>
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<h2 id="-mediator">🚧 Mediator</h2>
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<h2 id="-memento">🚧 Memento</h2>
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<h2 id="-observer">👓 Observer</h2>
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<h2 id="-protection-proxy">☔ Protection Proxy</h2>
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<p><strong>Source:</strong></p>
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</section>
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</div>

‎Design-Patterns.playground/Documentation/section-51.html

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<body>
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<div class="content-wrapper">
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<section class="section">
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<h2 id="-state">🐉 State</h2>
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<h1 id="behavioral">Behavioral</h1>
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<blockquote>
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<p>In software engineering, behavioral design patterns are design patterns that identify common communication patterns between objects and realize these patterns. By doing so, these patterns increase flexibility in carrying out this communication.</p>
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<p><strong>Source:</strong> <a href="http://en.wikipedia.org/wiki/Behavioral_pattern">wikipedia.org</a></p>
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</blockquote>
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<h2 id="-chain-of-responsibility">🚧 Chain Of Responsibility</h2>
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<h2 id="-command">👫 Command</h2>
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</section>
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</div>

‎Design-Patterns.playground/Documentation/section-55.html

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<body>
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<div class="content-wrapper">
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<section class="section">
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<h2 id="-strategy">💡 Strategy</h2>
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<h2 id="-iterator">🚧 Iterator</h2>
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<h2 id="-mediator">🚧 Mediator</h2>
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<h2 id="-memento">🚧 Memento</h2>
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<h2 id="-observer">👓 Observer</h2>
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</section>
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</div>

‎Design-Patterns.playground/Documentation/section-59.html

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<body>
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<div class="content-wrapper">
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<section class="section">
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<h2 id="-visitor">🏃 Visitor</h2>
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<h2 id="-state">🐉 State</h2>
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</section>
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</div>

‎Design-Patterns.playground/Documentation/section-63.html

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<body>
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<div class="content-wrapper">
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<section class="section">
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<h1 id="info">Info</h1>
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<p>🍺 Playground generated with: <a href="https://github.com/jas/swift-playground-builder">Swift Playground Builder</a> by <a href="http://twitter.com/jasonsandmeyer">@jasonsandmeyer</a></p>
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<p>🚀 How to generate playground (+zip) from this README: <a href="https://github.com/ochococo/Design-Patterns-In-Swift/blob/master/GENERATE.markdown">GENERATE.markdown</a></p>
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<h2 id="-strategy">💡 Strategy</h2>
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</section>
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</div>

‎Design-Patterns.playground/Documentation/section-65.html

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Section 66</title>
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<meta id="xcode-display" name="xcode-display" content="render">
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<meta name="apple-mobile-web-app-capable" content="yes">
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<meta name="viewport" content="width=device-width, maximum-scale=1.0">
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<link rel="stylesheet" type="text/css" href="stylesheet.css">
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</head>
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<body>
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<div class="content-wrapper">
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<section class="section">
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<p><strong>Usage:</strong></p>
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</section>
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</div>
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</body>
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</html>

‎Design-Patterns.playground/Documentation/section-67.html

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Section 68</title>
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<meta id="xcode-display" name="xcode-display" content="render">
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<meta name="apple-mobile-web-app-capable" content="yes">
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<meta name="viewport" content="width=device-width, maximum-scale=1.0">
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<link rel="stylesheet" type="text/css" href="stylesheet.css">
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</head>
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<body>
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<div class="content-wrapper">
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<section class="section">
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<h2 id="-visitor">🏃 Visitor</h2>
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</section>
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</div>
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</body>
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</html>

‎Design-Patterns.playground/Documentation/section-69.html

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Section 70</title>
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<meta id="xcode-display" name="xcode-display" content="render">
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<meta name="apple-mobile-web-app-capable" content="yes">
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<meta name="viewport" content="width=device-width, maximum-scale=1.0">
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<link rel="stylesheet" type="text/css" href="stylesheet.css">
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</head>
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<body>
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<div class="content-wrapper">
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<section class="section">
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<p><strong>Usage:</strong></p>
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</section>
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</div>
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</body>
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</html>

‎Design-Patterns.playground/Documentation/section-71.html

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Section 72</title>
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<meta id="xcode-display" name="xcode-display" content="render">
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<meta name="apple-mobile-web-app-capable" content="yes">
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<meta name="viewport" content="width=device-width, maximum-scale=1.0">
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<link rel="stylesheet" type="text/css" href="stylesheet.css">
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</head>
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<body>
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<div class="content-wrapper">
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<section class="section">
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<h1 id="info">Info</h1>
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<p>🍺 Playground generated with: <a href="https://github.com/jas/swift-playground-builder">Swift Playground Builder</a> by <a href="http://twitter.com/jasonsandmeyer">@jasonsandmeyer</a></p>
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<p>🚀 How to generate playground (+zip) from this README: <a href="https://github.com/ochococo/Design-Patterns-In-Swift/blob/master/GENERATE.markdown">GENERATE.markdown</a></p>
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</section>
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</div>
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</body>
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</html>

‎Design-Patterns.playground/contents.xcplayground

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</code>
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<documentation relative-path="section-63.html">
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</documentation>
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<code source-file-name="section-64.swift">
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</code>
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<documentation relative-path="section-65.html">
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</documentation>
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<code source-file-name="section-66.swift">
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</code>
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<documentation relative-path="section-67.html">
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</documentation>
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<code source-file-name="section-68.swift">
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</code>
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<documentation relative-path="section-69.html">
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</documentation>
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<code source-file-name="section-70.swift">
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</code>
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<documentation relative-path="section-71.html">
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</documentation>
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</sections>
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</playground>

‎Design-Patterns.playground/section-44.swift

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protocol FileOperationCommand {
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init(file: String)
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func execute()
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protocol HEVSuitMedicalAid {
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func administerMorphine() -> String
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}
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class FileMoveCommand : FileOperationCommand {
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let file:String
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required init(file: String) {
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self.file = file
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}
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func execute() {
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print("\(file) moved")
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class HEVSuit : HEVSuitMedicalAid {
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func administerMorphine() -> String {
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return "Morphine aministered."
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}
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}
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class FileDeleteCommand : FileOperationCommand {
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let file:String
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required init(file: String) {
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self.file = file
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}
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class HEVSuitHumanInterface : HEVSuitMedicalAid {
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func execute() {
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print("\(file) deleted")
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}
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}
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lazy private var physicalSuit: HEVSuit = HEVSuit()
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class FileManager {
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let deleteCommand: FileOperationCommand
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let moveCommand: FileOperationCommand
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init(deleteCommand: FileDeleteCommand, moveCommand: FileMoveCommand) {
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self.deleteCommand = deleteCommand
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self.moveCommand = moveCommand
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}
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func delete () {
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deleteCommand.execute()
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}
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func move () {
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moveCommand.execute()
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func administerMorphine() -> String {
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return physicalSuit.administerMorphine()
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}
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}

‎Design-Patterns.playground/section-46.swift

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let deleteCommand = FileDeleteCommand(file: "/path/to/testfile")
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let moveCommand = FileMoveCommand(file: "/path/to/testfile")
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let fileManager = FileManager(deleteCommand:deleteCommand , moveCommand: moveCommand)
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fileManager.delete()
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fileManager.move()
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let humanInterface = HEVSuitHumanInterface()
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humanInterface.administerMorphine()

‎Design-Patterns.playground/section-48.swift

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class StepCounter {
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var totalSteps: Int = 0 {
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willSet(newTotalSteps) {
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println("About to set totalSteps to \(newTotalSteps)")
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protocol DoorOperator {
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func openDoors(doors: String) -> String
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}
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class HAL9000 : DoorOperator {
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func openDoors(doors: String) -> String {
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return ("HAL9000: Affirmative, Dave. I read you. Opened \(doors).")
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}
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}
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class CurrentComputer : DoorOperator {
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private var computer: HAL9000!
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func authenticateWithPassword(pass: String) -> Bool {
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if pass != "pass" {
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return false
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}
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didSet {
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if totalSteps > oldValue {
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println("Added \(totalSteps - oldValue) steps")
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}
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computer = HAL9000()
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return true
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}
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func openDoors(doors: String) -> String {
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if (computer == nil) {
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return "Access Denied. I'm afraid I can't do that."
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}
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return computer.openDoors(doors)
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}
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}

‎Design-Patterns.playground/section-50.swift

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let stepCounter = StepCounter()
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stepCounter.totalSteps = 200
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// About to set totalSteps to 200
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// Added 200 steps
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stepCounter.totalSteps = 360
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// About to set totalSteps to 360
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// Added 160 steps
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stepCounter.totalSteps = 896
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// About to set totalSteps to 896
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// Added 536 steps
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let computer = CurrentComputer()
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let doors = "Pod Bay Doors"
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computer.openDoors(doors)
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computer.authenticateWithPassword("pass")
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computer.openDoors(doors)

‎Design-Patterns.playground/section-52.swift

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class Context {
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private var state: State = UnauthorizedState()
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func changeStateToAuthorized(#userId: String) {
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state = AuthorizedState(userId: userId)
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}
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func changeStateToUnauthorized() {
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state = UnauthorizedState()
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}
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var isAuthorized: Bool {
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get { return state.isAuthorized(self) }
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}
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var userId: String? {
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get { return state.userId(self) }
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}
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protocol FileOperationCommand {
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init(file: String)
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func execute()
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}
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protocol State {
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func isAuthorized(context: Context) -> Bool
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func userId(context: Context) -> String?
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class FileMoveCommand : FileOperationCommand {
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let file:String
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required init(file: String) {
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self.file = file
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}
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func execute() {
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print("\(file) moved")
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}
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}
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class UnauthorizedState: State {
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func isAuthorized(context: Context) -> Bool { return false }
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func userId(context: Context) -> String? { return nil }
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class FileDeleteCommand : FileOperationCommand {
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let file:String
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required init(file: String) {
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self.file = file
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}
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func execute() {
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print("\(file) deleted")
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}
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}
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class AuthorizedState: State {
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let userId: String
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init(userId: String) { self.userId = userId }
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func isAuthorized(context: Context) -> Bool { return true }
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func userId(context: Context) -> String? { return userId }
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class FileManager {
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let deleteCommand: FileOperationCommand
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let moveCommand: FileOperationCommand
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init(deleteCommand: FileDeleteCommand, moveCommand: FileMoveCommand) {
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self.deleteCommand = deleteCommand
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self.moveCommand = moveCommand
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}
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func delete () {
38+
deleteCommand.execute()
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}
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func move () {
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moveCommand.execute()
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}
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}

‎Design-Patterns.playground/section-54.swift

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let context = Context()
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(context.isAuthorized, context.userId)
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context.changeStateToAuthorized(userId: "admin")
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(context.isAuthorized, context.userId) // now logged in as "admin"
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context.changeStateToUnauthorized()
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(context.isAuthorized, context.userId)
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let deleteCommand = FileDeleteCommand(file: "/path/to/testfile")
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let moveCommand = FileMoveCommand(file: "/path/to/testfile")
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let fileManager = FileManager(deleteCommand:deleteCommand , moveCommand: moveCommand)
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fileManager.delete()
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fileManager.move()

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