Merge 559f704422 into f978e42036

README.md

@@ -29,7 +29,7 @@ A curated collection of idiomatic design & application patterns for Go language.
 | [Composite](/structural/composite.md) | Encapsulates and provides access to a number of different objects | ✘ |
 | [Decorator](/structural/decorator.md) | Adds behavior to an object, statically or dynamically | ✔ |
 | [Facade](/structural/facade.md) | Uses one type as an API to a number of others | ✘ |
-| [Flyweight](/structural/flyweight.md) | Reuses existing instances of objects with similar/identical state to minimize resource usage | ✘ |
+| [Flyweight](/structural/flyweight.go) | Reuses existing instances of objects with similar/identical state to minimize resource usage |✔ |
 | [Proxy](/structural/proxy.md) | Provides a surrogate for an object to control it's actions | ✔ |
 
 ## Behavioral Patterns

structural/flyweight.go

@@ -0,0 +1,54 @@
+package main
+import (
+	"fmt"
+	"math/rand"
+)
+
+type Shape interface {
+	draw()
+}
+
+type Circle struct{
+	x,y,r int
+	color string
+}
+
+func (c Circle)draw() {
+	fmt.Println("Draw circle..here",c.x,c.y,c.color)
+}
+
+type ShapeFactory struct{   
+   shapeMap map[string]Shape
+   colorArray []string
+}
+
+func NewShapeFactory()ShapeFactory{
+	shapeFactoryVar:=ShapeFactory{}
+	shapeFactoryVar.shapeMap=make(map[string]Shape)
+	return shapeFactoryVar
+}
+
+func(s ShapeFactory)getShape(color string) Shape{
+  if circleVar,ok:=s.shapeMap[color];ok {
+	  fmt.Println("Cirle object of "+color +" already created..")
+     return circleVar
+  } 
+  circleVar:=Circle{}
+  circleVar.x=rand.Intn(100)
+  circleVar.y=rand.Intn(100)
+  circleVar.color=color
+  s.shapeMap[circleVar.color] =circleVar
+  return circleVar
+}
+
+func main(){
+	var shapevar Shape
+	shapeFactoryVar:=NewShapeFactory()
+	colorArray:=[]string{"red","yellow","blue","black","orange","green","purple","white"}
+	for i:=1;i<=10;i++ {
+		color:=colorArray[rand.Intn(len(colorArray)-1)]
+		shapevar =shapeFactoryVar.getShape(color)
+		shapevar.draw()
+	}
+	
+}