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  1. package main
  2.  
  3. import (
  4. 	"fmt"
  5. 	"time"
  6. )
  7.  
  8. type Knob struct {
  9. 	door *Door
  10. 	latched bool
  11. }
  12.  
  13. func NewKnob(d *Door) *Knob {
  14. 	k := new(Knob)
  15. 	k.door = d
  16. 	k.latched = true
  17. 	return k
  18. }
  19.  
  20. func (k *Knob) IsLatchedOff() bool {
  21. 	return !k.latched
  22. }
  23.  
  24. func (k *Knob) Turn() {
  25. 	k.latched = false
  26. }
  27.  
  28. func (k *Knob) Unturn() {
  29. 	if k.door.IsClose() { k.latched = true }
  30. }
  31.  
  32. type Door struct {
  33. 	knob *Knob
  34. 	closed bool
  35. }
  36.  
  37. func NewDoor() *Door {
  38. 	d := new(Door)
  39. 	d.knob = NewKnob(d)
  40. 	d.closed = true
  41. 	return d
  42. }
  43.  
  44. func (d *Door) Knob() *Knob {
  45. 	return d.knob
  46. }
  47.  
  48. func (d *Door) IsClose() bool {
  49. 	return d.closed
  50. }
  51.  
  52. func (d *Door) IsOpen() bool {
  53. 	return !d.closed
  54. }
  55.  
  56. func (d *Door) CanBeOpen() bool {
  57. 	return d.IsOpen() || d.knob.IsLatchedOff()
  58. }
  59.  
  60. func (d *Door) Push() {
  61. 	if d.CanBeOpen() { d.closed = false }
  62. }
  63.  
  64. func (d *Door) Pull() {
  65. 	d.closed = true
  66. 	d.knob.Unturn()
  67. }
  68.  
  69. type DoorCloserPull struct {
  70. 	door DoorWithCloserer
  71. 	Done bool
  72. }
  73.  
  74. type DoorWithCloserer interface {
  75. 	Delay() int
  76. 	Pull()
  77. }
  78.  
  79. func NewDoorCloserPull(d DoorWithCloserer) *DoorCloserPull {
  80. 	p := new(DoorCloserPull)
  81. 	p.door = d
  82. 	p.Done = false
  83. 	return p
  84. }
  85.  
  86. func (p *DoorCloserPull) Start() {
  87. 	time.Sleep(time.Duration(p.door.Delay()) * time.Millisecond)
  88. 	if !p.Done { p.door.Pull() }
  89. }
  90.  
  91. type DoorWithCloser struct {
  92. 	delay int
  93. 	delayedPull *DoorCloserPull
  94. 	*Door
  95. }
  96.  
  97. func NewDoorWithCloser() *DoorWithCloser {
  98. 	d := new(DoorWithCloser)
  99. 	d.Door = NewDoor()
  100. 	d.delay = 300
  101. 	return d
  102. }
  103.  
  104. func (d *DoorWithCloser) Delay() int {
  105. 	return d.delay
  106. }
  107.  
  108. func (d *DoorWithCloser) Push() {
  109. 	d.Door.Push()
  110. 	if d.delayedPull != nil && !d.delayedPull.Done {
  111. 		d.delayedPull.Done = true
  112. 	}
  113. 	d.delayedPull = NewDoorCloserPull(d)
  114. 	go d.delayedPull.Start()
  115. }
  116.  
  117. type DoorWithStopper struct {
  118. 	*Door
  119. 	Stoppered bool
  120. }
  121.  
  122. func (d *DoorWithStopper) BeStopperedOn() {
  123. 	d.Stoppered = true
  124. }
  125.  
  126. func (d *DoorWithStopper) BeStopperedOff() {
  127. 	d.Stoppered = false
  128. }
  129.  
  130. func (d *DoorWithStopper) Pull() {
  131. 	if !d.Stoppered { d.Door.Pull() }
  132. }
  133.  
  134. func (d *DoorWithStopper) Push() {
  135. 	d.Stoppered = false
  136. 	d.Door.Push()
  137. }
  138.  
  139. func NewDoorWithStopper() *DoorWithStopper {
  140. 	d := new(DoorWithStopper)
  141. 	d.Stoppered = false
  142. 	d.Door = NewDoor()
  143. 	return d
  144. }
  145.  
  146. type DoorWithCloserStopper struct {
  147. 	*DoorWithCloser
  148. 	*DoorWithStopper
  149. }
  150.  
  151. func NewDoorWithCloserStopper() *DoorWithCloserStopper {
  152. 	d := new(DoorWithCloserStopper)
  153. 	d.DoorWithCloser = NewDoorWithCloser()
  154. 	d.DoorWithStopper = NewDoorWithStopper()
  155. 	d.DoorWithCloser.Door = d.DoorWithStopper.Door
  156. 	return d
  157. }
  158.  
  159. func (d *DoorWithCloserStopper) BeStopperedOff() {
  160. 	d.Push()
  161. }
  162.  
  163. func (d *DoorWithCloserStopper) Pull() {
  164. 	d.DoorWithStopper.Pull()
  165. }
  166.  
  167. func (d *DoorWithCloserStopper) Push() {
  168. 	d.DoorWithStopper.Push()
  169. 	if d.delayedPull != nil && !d.delayedPull.Done {
  170. 		d.delayedPull.Done = true
  171. 	}
  172. 	d.delayedPull = NewDoorCloserPull(d)
  173. 	go d.delayedPull.Start()
  174. }
  175.  
  176. func (d *DoorWithCloserStopper) Knob() *Knob {
  177. 	return d.DoorWithCloser.Knob()
  178. }
  179.  
  180. func (d *DoorWithCloserStopper) IsOpen() bool {
  181. 	return d.DoorWithCloser.IsOpen()
  182. }
  183.  
  184. func (d *DoorWithCloserStopper) IsClose() bool {
  185. 	return d.DoorWithCloser.IsClose()
  186. }
  187.  
  188. func (d *DoorWithCloserStopper) CanBeOpen() bool {
  189. 	return d.DoorWithCloser.CanBeOpen()
  190. }
  191.  
  192. func main(){
  193. 	door := NewDoor()
  194. 	fmt.Println("door is a Door...")
  195. 	door.Knob().Turn()
  196. 	fmt.Println("door.Knob().Turn(); door.CanBeOpen() =>", door.CanBeOpen())
  197. 	door.Knob().Unturn()
  198. 	fmt.Println("door.Knob().Unturn(); door.CanBeOpen() =>", door.CanBeOpen())
  199. 	door.Push()
  200. 	fmt.Println("door.Push(); door.IsOpen() =>", door.IsOpen())
  201. 	door.Knob().Turn(); door.Push()
  202. 	fmt.Println("door.Knob().Turn(); door.Push(); door.IsOpen() =>", door.IsOpen())
  203. 	door.Pull()
  204. 	fmt.Println("door.Pull(); door.IsClose() => ", door.IsClose())
  205. 	fmt.Println("door.CanBeOpen() =>", door.CanBeOpen())
  206. 	fmt.Println()
  207.  
  208. 	door2 := NewDoorWithCloser()
  209. 	fmt.Println("door2 is a DoorWithCloser...")
  210. 	door2.Knob().Turn(); door2.Push()
  211. 	fmt.Println("door2.Knob().Turn(); door2.Push(); door2.IsOpen() =>", door2.IsOpen())
  212. 	fmt.Print("0.1 second after")
  213. 	time.Sleep(100 * time.Millisecond)
  214. 	fmt.Println(", door2.IsOpen() =>", door2.IsOpen())
  215. 	fmt.Print("0.4 seconds after")
  216. 	time.Sleep(300 * time.Millisecond)
  217. 	fmt.Println(", door2.IsOpen() =>", door2.IsOpen())
  218. 	fmt.Println()
  219.  
  220. 	door3 := NewDoorWithStopper()
  221. 	fmt.Println("door3 is a DoorWithStopper...")
  222. 	door3.Knob().Turn(); door3.Push()
  223. 	fmt.Println("door3.Knob().Turn(); door3.Push(); door3.IsOpen() =>", door3.IsOpen())
  224. 	door3.BeStopperedOn(); door3.Pull()
  225. 	fmt.Println("door3.BeStopperedOn(); door3.Pull(); door3.IsClose() =>", door3.IsClose())
  226. 	door3.BeStopperedOff(); door3.Pull()
  227. 	fmt.Println("door3.BeStopperedOff(); door3.Pull(); door3.IsClose() =>", door3.IsClose())
  228. 	door3.Knob().Turn(); door3.Push()
  229. 	fmt.Println("door3.Knob().Turn(); door3.Push(); door3.IsOpen() =>", door3.IsOpen())
  230. 	door3.BeStopperedOn(); door3.Pull()
  231. 	fmt.Println("door3.BeStopperedOn(); door3.Pull(); door3.IsClose() =>", door3.IsClose())
  232. 	door3.Push(); door3.Pull()
  233. 	fmt.Println("door3.Push(); door3.Pull(); door3.IsClose() =>", door3.IsClose())
  234. 	fmt.Println()
  235.  
  236. 	door4 := NewDoorWithCloserStopper()
  237. 	fmt.Println("door4 is a DoorWithCloserStopper...")
  238. 	door4.Knob().Turn(); door4.Push()
  239. 	fmt.Println("door4.Knob().Turn(); door4.Push(); door4.IsOpen() =>", door4.IsOpen())
  240. 	door4.BeStopperedOn()
  241. 	fmt.Print("door4.BeStopperedOn(); 0.4 seconds after")
  242. 	time.Sleep(400 * time.Millisecond)
  243. 	fmt.Println(", door4.IsOpen() =>", door4.IsOpen())
  244. 	door4.BeStopperedOff()
  245. 	fmt.Print("door4.BeStopperedOff(); 0.4 seconds after")
  246. 	time.Sleep(400 * time.Millisecond)
  247. 	fmt.Println(", door4.IsOpen() =>", door4.IsOpen())
  248. 	door4.Knob().Turn(); door4.Push()
  249. 	fmt.Println("door4.Knob().Turn(); door4.Push(); door4.IsOpen() =>", door4.IsOpen())
  250. 	door4.BeStopperedOn()
  251. 	fmt.Print("door4.BeStopperedOn(); 0.4 seconds after")
  252. 	time.Sleep(400 * time.Millisecond)
  253. 	fmt.Println(", door4.IsOpen() =>", door4.IsOpen())
  254. 	door4.Push()
  255. 	fmt.Print("door4.Push(); 0.4 seconds after")
  256. 	time.Sleep(400 * time.Millisecond)
  257. 	fmt.Println(", door4.IsOpen() =>", door4.IsOpen())
  258. }
  259.  
Success #stdin #stdout 0s 3000KB
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door is a Door...
door.Knob().Turn(); door.CanBeOpen() => true
door.Knob().Unturn(); door.CanBeOpen() => false
door.Push(); door.IsOpen() => false
door.Knob().Turn(); door.Push(); door.IsOpen() => true
door.Pull(); door.IsClose() =>  true
door.CanBeOpen() => false

door2 is a DoorWithCloser...
door2.Knob().Turn(); door2.Push(); door2.IsOpen() => true
0.1 second after, door2.IsOpen() => true
0.4 seconds after, door2.IsOpen() => false

door3 is a DoorWithStopper...
door3.Knob().Turn(); door3.Push(); door3.IsOpen() => true
door3.BeStopperedOn(); door3.Pull(); door3.IsClose() => false
door3.BeStopperedOff(); door3.Pull(); door3.IsClose() => true
door3.Knob().Turn(); door3.Push(); door3.IsOpen() => true
door3.BeStopperedOn(); door3.Pull(); door3.IsClose() => false
door3.Push(); door3.Pull(); door3.IsClose() => true

door4 is a DoorWithCloserStopper...
door4.Knob().Turn(); door4.Push(); door4.IsOpen() => true
door4.BeStopperedOn(); 0.4 seconds after, door4.IsOpen() => true
door4.BeStopperedOff(); 0.4 seconds after, door4.IsOpen() => false
door4.Knob().Turn(); door4.Push(); door4.IsOpen() => true
door4.BeStopperedOn(); 0.4 seconds after, door4.IsOpen() => true
door4.Push(); 0.4 seconds after, door4.IsOpen() => false
https://ideone.com/TW4PzD
language:
Go (go 1.12.1)
created:
7 years ago
visibility:
public

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