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T0shikT0shik
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bridge, flyweight, iterator
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‎README.md‎

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@@ -19,7 +19,10 @@ Full Playlist can be found [here](https://www.youtube.com/playlist?list=PLOeFnOV
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- [Proxy](https://youtu.be/m0aXyRDEQqU)
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- [Facade](https://youtu.be/xzpp5_ak8Hg)
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- [Composite](https://youtu.be/UsynwPeipb8)
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- [Bridge](https://youtu.be/ECBimbOaPs0)
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- [Flyweight](https://youtu.be/XxOFsO-Xw8k)
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### Behavioral Patterns
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WIP
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- [Iterator](https://youtu.be/Gco6zF_ygSc)

‎bridge/indirection_solution__bridge.linq‎

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<Query Kind="Program" />
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void Main()
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{
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}
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// top level abstraction
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public abstract class Vehicle {
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private Make make;
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}
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public abstract class Make {}
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// implementation
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public class Lada : Make { }
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public class Volvo : Make { }
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// lower level abstraction
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public class Car : Vehicle { }
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public class Truck : Vehicle { }

‎bridge/problem_statement.linq‎

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<Query Kind="Program" />
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void Main()
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{
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}
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// top level abstraction
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public abstract class Vehicle {}
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// implementation
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public class Lada : Vehicle { }
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public class Volvo : Vehicle { }
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// lower level abstraction
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public class LCar : Lada { }
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public class LTruck : Lada { }
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public class VCar : Volvo { }
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public class VTruck : Volvo { }
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// ---------------
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// try to re-arrange
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// ---------------
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// lower level abstraction
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public class Car : Vehicle { }
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public class Truck : Vehicle { }
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// implementations
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public class L2Car : Car { }
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public class L2Truck : Truck { }
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public class V2Car : Car { }
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public class V2Truck : Truck { }

‎bridge/real_world_example.linq‎

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<Query Kind="Program" />
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void Main()
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{
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List<string> stringList = new List<string>();
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ICollection<string> stringCollection = new List<string>();
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IEnumerable<string> stringEnumerable = new List<string>();
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List<int> intList = new List<int>();
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ICollection<int> intCollection = new List<int>();
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IEnumerable<int> intEnumerable = new List<int>();
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}

‎bridge/see_the_braids.linq‎

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<Query Kind="Program" />
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void Main()
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{
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}
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// top level abstraction
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public abstract class Vehicle
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{
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private Make make;
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public void Start()
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{
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make.PerformRitual();
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make.StartCar();
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}
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public abstract bool AllowedToDrive(string person);
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}
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public abstract class Make
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{
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public abstract void PerformRitual();
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public abstract void StartCar();
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}
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// implementation
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public class Lada : Make
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{
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public override void PerformRitual() => "Hit the car".Dump();
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public override void StartCar() {
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"fix the wiring".Dump();
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"lube the engine".Dump();
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"put the key in".Dump();
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"turn the key".Dump();
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}
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}
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public class Volvo : Make
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{
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public override void PerformRitual() => "Greatful for buying a volvo".Dump();
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public override void StartCar() => "Press button".Dump();
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}
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// lower level abstraction
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public class Car : Vehicle
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{
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public override bool AllowedToDrive(string person) => person == "has license";
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}
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public class Truck : Vehicle
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{
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public override bool AllowedToDrive(string person) => person == "has special truck license";
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}
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‎flyweight/intrinsic_extrinsic_states_with_decorator.linq‎

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<Query Kind="Program" />
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void Main()
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{
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}
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public class Icon
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{
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public Icon(string type)
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{
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// load icon
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}
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}
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static class ButtonProvider
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{
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private static Dictionary<string, Button> _cache = new Dictionary<string, Button>();
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public static Button GetButton(string type, Func<Button> buttonFactory)
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{
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if (!_cache.ContainsKey(type))
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{
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_cache[type] = buttonFactory();
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}
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return _cache[type];
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}
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}
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static Button SettingsButtonFactory() => new SettingsButton();
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abstract class Button
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{
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// intrinsic state
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public Icon Icon { get; set; }
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public abstract void Click();
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}
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class SettingsButton : Button
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{
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public SettingsButton()
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{
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Icon = new Icon("settings");
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}
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public override void Click()
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{
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// do something
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}
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}
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class DropdownButton : Button
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{
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Button _btn;
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public DropdownButton(Button btn, params string[] options)
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{
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_btn = btn;
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}
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public override void Click()
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{
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_btn.Click(); // do the original thing
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// display options
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}
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}
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class SolutionWindow
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{
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Button settings = new DropdownButton(ButtonProvider.GetButton("settings", SettingsButtonFactory), "option1", "option2");
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}
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class TerminalWindow
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{
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Button settings = new DropdownButton(ButtonProvider.GetButton("settings", SettingsButtonFactory), "option2", "option3", "option4");
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}
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class TestRunnerWindow
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{
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Button settings = new DropdownButton(ButtonProvider.GetButton("settings", SettingsButtonFactory), "option1", "option2", "option4");
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}

‎flyweight/intrinsic_extrinsic_states_without_decorator.linq‎

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<Query Kind="Program" />
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void Main()
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{
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var btn = ButtonProvider.GetButton<string[]>("settings", SettingsButtonFactory);
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btn.Click(new[] {"option1", "option2", "option3", "option4"})
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}
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public class Icon
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{
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public Icon(string type)
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{
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// load icon
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}
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}
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static class ButtonProvider
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{
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private static Dictionary<string, Button> _cache = new Dictionary<string, Button>();
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public static Button<T> GetButton<T>(string type, Func<Button<T>> buttonFactory)
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{
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if (!_cache.ContainsKey(type))
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{
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_cache[type] = buttonFactory();
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}
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return (Button<T>) _cache[type];
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}
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}
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static SettingsButton SettingsButtonFactory() => new SettingsButton();
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abstract class Button
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{
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// intrinsic state
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public Icon Icon { get; set; }
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}
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abstract class Button<T> : Button
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{
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public abstract void Click(T config);
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}
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class SettingsButton : Button<string[]>
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{
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public SettingsButton()
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{
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Icon = new Icon("settings");
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}
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public override void Click(string[] config)
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{
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// display options
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}
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}

‎flyweight/the_problem.linq‎

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<Query Kind="Program" />
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void Main()
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{
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}
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public class Icon
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{
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public Icon(string path)
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{
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// load icon
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}
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}
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abstract class Button
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{
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public Icon Icon { get; set; }
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}
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class SettingsButton : Button
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{
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public SettingsButton()
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{
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Icon = new Icon("path_to_settings_icon");
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}
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}
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class SolutionWindow
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{
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SettingsButton settings = new SettingsButton();
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}
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class TerminalWindow
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{
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SettingsButton settings = new SettingsButton();
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}
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class TestRunnerWindow
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{
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SettingsButton settings = new SettingsButton();
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}

‎flyweight/the_solution.linq‎

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<Query Kind="Program" />
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void Main()
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{
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}
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// flyweight
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public class Icon
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{
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public Icon(string type)
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{
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// load icon
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}
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}
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static class IconProvider
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{
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private static Dictionary<string, Icon> _cache = new Dictionary<string, Icon>();
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public static Icon GetIcon(string type)
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{
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if (!_cache.ContainsKey(type))
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{
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_cache[type] = new Icon(type);
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}
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return _cache[type];
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}
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}
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abstract class Button
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{
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public Icon Icon { get; set; }
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}
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class SettingsButton : Button
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{
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public SettingsButton()
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{
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Icon = IconProvider.GetIcon("settings");
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}
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}
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class SolutionWindow
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{
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SettingsButton settings = new SettingsButton();
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}
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class TerminalWindow
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{
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SettingsButton settings = new SettingsButton();
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}
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class TestRunnerWindow
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{
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SettingsButton settings = new SettingsButton();
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}

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