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  1. package main
  2.  
  3. import "fmt"
  4.  
  5. type file struct {
  6.     name     string
  7. 	exist    bool
  8. 	openned  bool
  9. 	writable bool
  10. }
  11.  
  12. func (f *file) open() {
  13. 	if !f.exist {
  14. 		panic("file does not exist!")
  15. 	}
  16. 	if f.openned {
  17. 		return
  18. 	}
  19. 	f.openned = true
  20. 	fmt.Println(f.name + ": openned")
  21. }
  22.  
  23. func (f *file) write(data string) {
  24. 	if !f.openned {
  25. 		panic("can not write to closed file!")
  26. 	}
  27. 	if !f.writable {
  28. 		panic("can not write to file: permission denied!")
  29. 	}
  30. 	fmt.Println(f.name + ": writed: " + data)
  31. }
  32.  
  33. func (f *file) close() {
  34. 	if f.openned {
  35. 		f.openned = false
  36. 		fmt.Println(f.name + ": closed")
  37. 	}
  38. }
  39.  
  40. // --------------------------------
  41.  
  42. func (f *file) onOpenError() {
  43. 	if r := recover(); r != nil {
  44. 		fmt.Println(f.name + ":", r)
  45. 	}
  46. }
  47.  
  48. func (f *file) onWriteError() {
  49. 	if r := recover(); r != nil {
  50. 		fmt.Println(f.name + ":", r)
  51. 	}
  52. }
  53.  
  54. // --------------------------------
  55.  
  56. func makeTest(name string, exist bool, writable bool) func() {
  57. 	return func() {
  58. 		f := &file{name: name, exist: exist, openned: false, writable: writable}
  59.  
  60. 		defer f.onOpenError()
  61. 		f.open()
  62.  
  63. 		defer f.close()
  64. 		defer f.onWriteError()
  65. 		f.write("Hello!")
  66. 	}
  67. }
  68.  
  69. var tests = []func(){
  70. 	makeTest("test1", false, false),
  71. 	makeTest("test2", false,  true),
  72. 	makeTest("test3", true,  false),
  73. 	makeTest("test4", true,   true),
  74. }
  75.  
  76. func main() {
  77. 	for _, test := range tests {
  78. 		fmt.Println("--------------------------------")
  79. 		test()
  80. 	}
  81. }
  82.  
Success #stdin #stdout 0.02s 2416KB
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stdin
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Standard input is empty
stdout
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--------------------------------
test1: file does not exist!
--------------------------------
test2: file does not exist!
--------------------------------
test3: openned
test3: can not write to file: permission denied!
test3: closed
--------------------------------
test4: openned
test4: writed: Hello!
test4: closed
https://ideone.com/AFkiyg
language:
Go (go 1.12.1)
created:
12 years ago
visibility:
public

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