Add creational/abstract-factory

README.md

@@ -15,7 +15,7 @@ A curated collection of idiomatic design & application patterns for Go language.
 
 | Pattern | Description | Status |
 |:-------:|:----------- |:------:|
-| [Abstract Factory](/creational/abstract_factory.md) | Provides an interface for creating families of releated objects | ✘ |
+| [Abstract Factory](/creational/abstract-factory.md) | Provides an interface for creating families of releated objects | ✔ |
 | [Builder](/creational/builder.md) | Builds a complex object using simple objects | ✔ |
 | [Factory Method](/creational/factory.md) | Defers instantiation of an object to a specialized function for creating instances | ✔ |
 | [Object Pool](/creational/object-pool.md) | Instantiates and maintains a group of objects instances of the same type | ✔ |

creational/abstract-factory.go

@@ -0,0 +1,86 @@
+//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{}
+	case "darwin":
+		factory = &osxFactory{}
+	default:
+		factory = &otherOSFactory{}
+	}
+
+	button := factory.createButton()
+	button.paint()
+}

creational/abstract-factory.md

@@ -0,0 +1,7 @@
+# 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).