From 81c20c5cb7344e21ae5366b416f41cdb0e6e772b Mon Sep 17 00:00:00 2001
From: ismayilmalik <ismayilturksoy@gmail.com>
Date: Mon, 8 Jan 2018 21:15:03 +0400
Subject: [PATCH] implemented bridge pattern

---
 README.md                   |  4 ++++
 structural/bridge/bridge.go | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 structural/bridge/bridge.go

diff --git a/README.md b/README.md
index 942097e..4336e3f 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,7 @@
 - [Structural patterns](#structural-patterns)
     - [Composition](#composition)
     - [Adapter](#adapter)
+    - [Bridge](#bridge)
 - [Behavioral patterns](#behavioral-patterns)
     - [Chain of responsibility](#chain-of-responsibility)
     - [Strategy](#strategy)
@@ -58,6 +59,9 @@ lets clients treat individual objects and compositions of objects uniformly.
 Convert the interfac e of a class into another interface clients expect. Adapter lets
 classes work together that couldn' t otherwise because of incompatible interfaces.
 
+### Bridge
+Decouple an abstraction from its implementation so that the two can vary independently.
+
 ## Behavioral patterns
 Behavioral patterns are concerned with algorithms and the assignment of responsibilities
 between objects. Behavio ral patterns describe not just patterns of objects or classes
diff --git a/structural/bridge/bridge.go b/structural/bridge/bridge.go
new file mode 100644
index 0000000..8804813
--- /dev/null
+++ b/structural/bridge/bridge.go
@@ -0,0 +1,37 @@
+package bridge
+
+import "fmt"
+import "errors"
+
+// Bridge interface
+type Drawer interface {
+	DrawRectangle(w, h int) 
+}
+
+type GreenRectangleDrawer struct {}
+func (d GreenRectangleDrawer) DrawRectangle(w, h int) {
+	fmt.Printf("Green rectangle W: %d, H: %d", w, h)
+}
+
+type RedRectangleDrawer struct {}
+func (d RedRectangleDrawer) DrawRectangle(w, h int) {
+	fmt.Printf("Red rectangle W: %d, H: %d", w, h)
+}
+
+type Shape interface {
+	Draw() error
+}
+
+type Rectangle struct {
+	Width, Height int
+	drawer Drawer
+}
+
+func (d Rectangle) Draw () error {
+	if d.drawer == nil {
+		return errors.New("Drawer not initialized.")
+	}
+
+	d.drawer.DrawRectangle(d.Width, d.Height)
+	return nil
+}
\ No newline at end of file