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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()
+	}
+	
+}