creational/abstract-factory: implement abstract pattern

creational/abstract_factory.go

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+//Source code adapted from https://en.wikipedia.org/wiki/Abstract_factory_pattern
+//Added "otherOS" in case this code is executed on other os than windows, mac os x
+package main
+
+import (
+	"fmt"
+	"runtime"
+)
+
+type iButton interface {
+	paint()
+}
+
+type iGUIFactory interface {
+	createButton() iButton
+}
+
+type winFactory struct {
+}
+
+func (WF *winFactory) createButton() iButton {
+	return newWinButton()
+}
+
+type osxFactory struct {
+}
+
+func (WF *osxFactory) createButton() iButton {
+	return newOSXButton()
+}
+
+type otherOSFactory struct {
+}
+
+func (WF *otherOSFactory) createButton() iButton {
+	return newOtherOSButton()
+}
+
+type winButton struct {
+}
+
+func (wb *winButton) paint() {
+	fmt.Println("WinButton")
+}
+
+func newWinButton() *winButton {
+	return &winButton{}
+}
+
+type osxButton struct {
+}
+
+func (ob *osxButton) paint() {
+	fmt.Println("OSXButton")
+}
+
+func newOSXButton() *osxButton {
+	return &osxButton{}
+}
+
+type otherOSButton struct {
+}
+
+func (ob *otherOSButton) paint() {
+	fmt.Println("OtherOSButton")
+}
+
+func newOtherOSButton() *otherOSButton {
+	return &otherOSButton{}
+}
+
+func main() {
+	var factory iGUIFactory
+
+	switch runtime.GOOS {
+	case "windows":
+		factory = &winFactory{}
+		break
+	case "darwin":
+		factory = &osxFactory{}
+		break
+	default:
+		factory = &otherOSFactory{}
+	}
+
+	button := factory.createButton()
+	button.paint()
+}

creational/abstract_factory.md

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+# Abstract Factory Pattern
+
+The [abstract factory design pattern](https://en.wikipedia.org/wiki/Abstract_factory_pattern) provides an interface for creating families of releated objects
+
+# Implementation and Example
+
+An example with implementation and usage can be found in [abstract_factory.go](abstract_factory.go).