From 131bd3cec7c71759c489e9bbdec9924f0703de93 Mon Sep 17 00:00:00 2001
From: Jian Han <jian.han@neds.com>
Date: Thu, 9 Nov 2017 22:21:17 +1000
Subject: [PATCH] builder pattern

---
 creational/builder/builder.go | 49 +++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 creational/builder/builder.go

diff --git a/creational/builder/builder.go b/creational/builder/builder.go
new file mode 100644
index 0000000..092bce0
--- /dev/null
+++ b/creational/builder/builder.go
@@ -0,0 +1,49 @@
+package builder
+
+type BuildProcess interface {
+	SetWheels() BuildProcess
+	SetSeats() BuildProcess
+	SetStructure() BuildProcess
+	GetVehicle() VehicleProduct
+}
+
+type VehicleProduct struct {
+	Wheels    int
+	Seats     int
+	Structure string
+}
+
+type CarBuilder struct {
+	v VehicleProduct
+}
+
+func (c *CarBuilder) SetWheels() BuildProcess {
+	c.v.Wheels = 2
+	return c
+}
+
+func (c *CarBuilder) SetSeats() BuildProcess {
+	c.v.Seats = 5
+	return c
+}
+
+func (c *CarBuilder) SetStructure() BuildProcess {
+	c.v.Structure = "Car"
+	return nil
+}
+
+func (c *CarBuilder) GetVehicle() VehicleProduct {
+	return c.v
+}
+
+type ManufactureDirector struct {
+	builder BuildProcess
+}
+
+func (f *ManufactureDirector) SetBuilder(b BuildProcess) {
+	f.builder = b
+}
+
+func (f *ManufactureDirector) Construct() {
+	f.builder.SetSeats().SetStructure().SetWheels()
+}