Adapter pattern bridge

patterns/bridge/device_options.go

@@ -0,0 +1,11 @@
+package bridge
+
+type Device interface {
+	IsEnabled() bool
+	Enable() bool
+	Disable() bool
+	GetVolume() int
+	SetVolume(int) bool
+	GetChannel() int
+	SetChannel(int) bool
+}

patterns/bridge/radio.go

@@ -0,0 +1,43 @@
+package bridge
+
+type Radio struct {
+	enabled bool
+	volume  int
+	channel int
+}
+
+func (r *Radio) IsEnabled() bool {
+	return r.enabled == true
+}
+
+func (r *Radio) Enable() bool {
+	r.enabled = true
+	return true
+}
+
+func (r *Radio) Disable() bool {
+	r.enabled = false
+	return false
+}
+
+func (r *Radio) GetVolume() int {
+	return r.volume
+}
+
+func (r *Radio) SetVolume(volume int) bool {
+	r.volume = volume
+	return true
+}
+
+func (r *Radio) GetChannel() int {
+	return r.channel
+}
+
+func (r *Radio) SetChannel(i int) bool {
+	//TODO implement me
+	panic("implement me")
+}
+
+func NewRadio() *Radio {
+	return &Radio{}
+}

patterns/bridge/remote_control.go

@@ -0,0 +1,44 @@
+package bridge
+
+type RemoteControl struct {
+	device Device
+}
+
+func NewRemoteControl(device Device) *RemoteControl {
+	return &RemoteControl{device: device}
+}
+
+func (r *RemoteControl) TogglePower() bool {
+	if r.device.IsEnabled() {
+		return r.device.Disable()
+	}
+	return r.device.Enable()
+}
+
+func (r *RemoteControl) VolumeDown() bool {
+	return r.device.SetVolume(r.device.GetVolume() - 10)
+}
+
+func (r *RemoteControl) VolumeUp() bool {
+	return r.device.SetVolume(r.device.GetVolume() + 10)
+}
+
+func (r *RemoteControl) ChannelDown() bool {
+	return r.device.SetChannel(r.device.GetChannel() - 1)
+}
+
+func (r *RemoteControl) ChannelUp() bool {
+	return r.device.SetChannel(r.device.GetChannel() + 1)
+}
+
+type AdvancedRemoteControl struct {
+	RemoteControl
+}
+
+func NewAdvancedRemoteControl(device Device) *AdvancedRemoteControl {
+	return &AdvancedRemoteControl{RemoteControl{device: device}}
+}
+
+func (a *AdvancedRemoteControl) Mute() bool {
+	return a.device.SetVolume(0)
+}

patterns/bridge/remote_control_test.go

@@ -0,0 +1,14 @@
+package bridge
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestRemoteControl(t *testing.T) {
+	rcTV := NewRemoteControl(NewTV())
+	assert.True(t, rcTV.TogglePower())
+
+	rcRadio := NewAdvancedRemoteControl(NewRadio())
+	assert.True(t, rcRadio.TogglePower())
+}

patterns/bridge/tv.go

@@ -0,0 +1,47 @@
+package bridge
+
+type TV struct {
+	enabled bool
+	volume  int
+	channel int
+}
+
+func NewTV() *TV {
+	return &TV{
+		enabled: false,
+		volume:  0,
+		channel: 0,
+	}
+}
+
+func (t *TV) IsEnabled() bool {
+	return t.enabled == true
+}
+
+func (t *TV) Enable() bool {
+	t.enabled = true
+	return t.enabled
+}
+
+func (t *TV) Disable() bool {
+	t.enabled = false
+	return true
+}
+
+func (t *TV) GetVolume() int {
+	return t.volume
+}
+
+func (t *TV) SetVolume(volume int) bool {
+	t.volume = volume
+	return true
+}
+
+func (t *TV) GetChannel() int {
+	return t.channel
+}
+
+func (t *TV) SetChannel(i int) bool {
+	t.channel = i
+	return true
+}