Design Pattern Examples in Kotlin/Native

Model and code examples of GoF Design Patterns for Kotlin/Native.
This project is available for the following objectives:

To understand GoF Design Pattern examples in Kotlin/Native.
To understand the mapping between UML model and Kotlin/Native code.
To try Model-Driven Development (MDD) using Astah and M PLUS plug-in.

NOTE: The code examples use GTK4 and work on Ubuntu 22 (x86_64) and Fedora 36 (x86_64).

UML model example:

Kotlin/Native code example:

package structuralPatterns.composite
// ˅
// ˄

abstract class FileSystemElement {
    // ˅
    // ˄

    abstract val name: String
        // ˅
        
        // ˄

    abstract val size: Int
        // ˅
        
        // ˄

    // Print this element with the "upperPath".
    abstract fun print(upperPath: String)

    override fun toString(): String {
        // ˅
        return "$name ($size)"
        // ˄
    }

    // ˅
    
    // ˄
}

// ˅

// ˄

Installation on Ubuntu/Fedora

NOTE: The code examples work on Ubuntu 22 (x86_64) and Fedora 36 (x86_64).

UML Modeling Tool

Download the modeling tool Astah UML or Professional, and install.
Download M PLUS plug-in ver.2.8.2 or higher, and add it to Astah.
How to add plugins to Astah

Kotlin/Native Development Environment

Download and install IntelliJ.

Run the following command to install GTK4 development libraries.
Ubuntu 22

sudo apt install libgtk-4-dev libncurses5 gcc-multilib

Fedora 36

sudo dnf install gtk4-devel ncurses-compat-libs

Usage on Ubuntu/Fedora

NOTE: The code examples work on Ubuntu 22 (x86_64) and Fedora 36 (x86_64).

Code Generation from UML

Open the Astah file (model/DesignPatternExamplesInKotlinNative.asta).
Select model elements on the model browser of Astah.
Click the Generate Code button.

The generated code has User Code Area. The User Code Area is the area enclosed by "˅" and "˄". Handwritten code written in the User Code Area remains after a re-generation. View code example.
For detailed usage of the tools, please see Astah Manual and M PLUS plug-in Tips.

Build and Run

Open the project root directory (design-pattern-examples-in-kotlin-native) in IntelliJ.
Open Main.kt for the pattern you want to run, and click Run icon in the left gutter.

References

Gamma, E. et al. Design Patterns: Elements of Reusable Object-Oriented Software, Addison-Wesley, 1994
Hiroshi Yuki. Learning Design Patterns in Java [In Japanese Language], Softbank publishing, 2004

Licence

This project is licensed under the Creative Commons Zero (CC0) license. The model and code are completely free to use.

Other Language Examples

C++, C#, Crystal, Go, Java, JavaScript, Python, Kotlin/JVM, Ruby, Scala, Swift, TypeScript

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