implemented prototype pattern

creational/prototype/prototype.go

@@ -0,0 +1,47 @@
+package prototye
+
+import "fmt"
+import "errors"
+
+const (
+	WHITE = 1
+	GREEN = 2
+	BLACK = 3
+)
+
+type ProductInfoGetter interface {
+	GetInfo() string
+}
+
+type Tshirt struct {
+	Size string 
+	Color string
+}
+
+func (t Tshirt) GetInfo() string {
+	return fmt.Sprintf("Tshirt size: '%s', Color: '%s'.", t.Size, t.Color)
+}
+
+var whiteTshirt *Tshirt = &Tshirt{ "M", "white" }
+var greenTshirt *Tshirt = &Tshirt{ "L", "green" }
+var blackTshirt *Tshirt = &Tshirt{ "S", "black" }
+
+func GetTshirClone(t int) (ProductInfoGetter, error) {
+	switch t {
+		case WHITE:
+			return whiteTshirt, nil
+		case GREEN:
+			return greenTshirt, nil
+		case BLACK:
+			return blackTshirt, nil
+		default:
+		return nil, errors.New(fmt.Sprintf("Prototype id %d not recognized.", t))
+	}
+}
+
+
+
+
+
+
+