From 82090ab82704b3ca3c2eda208f9c3624155223a8 Mon Sep 17 00:00:00 2001
From: ismayilmalik <ismayilturksoy@gmail.com>
Date: Tue, 2 Jan 2018 22:08:52 +0300
Subject: [PATCH] implemented factory pattern

---
 creational/factory/factory.go      | 42 ++++++++++++++++++++++++++++++
 creational/factory/factory_test.go | 42 ++++++++++++++++++++++++++++++
 2 files changed, 84 insertions(+)
 create mode 100644 creational/factory/factory.go
 create mode 100644 creational/factory/factory_test.go

diff --git a/creational/factory/factory.go b/creational/factory/factory.go
new file mode 100644
index 0000000..445f751
--- /dev/null
+++ b/creational/factory/factory.go
@@ -0,0 +1,42 @@
+package factory
+
+import (
+	"errors"
+	"fmt"
+)
+
+const (
+	SMS   = 1
+	Email = 2
+)
+
+type Notification struct {
+	To      string
+	Message string
+}
+
+type Notifier interface {
+	SendNotification(Notification) string
+}
+
+type SMSNotification struct{}
+func (n SMSNotification) SendNotification(notification Notification) string {
+	return fmt.Sprintf("`%s` was sent to number `%s` successfully!", notification.Message, notification.To)
+}
+
+type EmailNotification struct{}
+func (n EmailNotification) SendNotification(notification Notification) string {
+	return fmt.Sprintf("`%s` was sent to email `%s` successfully!", notification.Message, notification.To)
+}
+
+// Factory .....
+func GetNotifier(notifierType int) (Notifier, error) {
+	switch notifierType {
+		case SMS:
+			return new(SMSNotification), nil
+		case Email:
+			return new(EmailNotification), nil
+		default:
+		return nil, errors.New(fmt.Sprintf("Notifier type %d not recognized.", notifierType))
+	}
+}
diff --git a/creational/factory/factory_test.go b/creational/factory/factory_test.go
new file mode 100644
index 0000000..4abe542
--- /dev/null
+++ b/creational/factory/factory_test.go
@@ -0,0 +1,42 @@
+package factory
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestGetSMSNotifier(t *testing.T)  {
+	notification := Notification{"5552233", "Hello world!"}
+	notifier, err := GetNotifier(SMS)
+
+	if err != nil {
+		t.Fatal("Notifier type 'SMS' must be returned")
+	}
+
+	resultStr := notifier.SendNotification(notification)
+	if !strings.Contains(resultStr, "was sent to number") {
+		t.Error("SMS notifier result message was not correct.")
+	}
+}
+
+func TestGetEmailNotifier(t *testing.T)  {
+	notification := Notification{"5552233", "Hello world!"}
+	notifier, err := GetNotifier(Email)
+
+	if err != nil {
+		t.Fatal("Notifier type 'Email' must be returned")
+	}
+
+	resultStr := notifier.SendNotification(notification)
+	if !strings.Contains(resultStr, "was sent to email") {
+		t.Error("Email notifier result message was not correct.")
+	}
+}
+
+func TestGetNonExistanceNotifier(t *testing.T)  {
+	_, err := GetNotifier(3)
+
+	if err == nil {
+		t.Fatal("Error must be returned for unrecognized notifier type.")
+	}
+}
\ No newline at end of file