1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42
43. 43
44. 44
45. 45
46. 46
47. 47
48. 48
49. 49
50. 50
51. 51
52. 52
53. 53
54. 54
55. 55
56. 56
57. 57
58. 58
59. 59
60. 60
61. 61
62. 62
63. 63
64. 64
65. 65
66. 66
67. 67
68. 68
69. 69
70. 70
71. 71
72. 72
73. 73
74. 74
75. 75
76. 76
77. 77
78. 78
79. 79
80. 80
81. 81
82. 82
83. 83
84. 84
85. 85
86. 86
87. 87
88. 88
89. 89
90. 90
91. 91
92. 92
93. 93
94. 94
95. 95
96. 96
97. 97
98. 98
99. 99
100. 100
101. 101
102. 102
103. 103
104. 104
105. 105
106. 106
107. 107
108. 108
109. 109
110. 110
111. 111
112. 112
113. 113
114. 114
115. 115
116. 116
117. 117
118. 118
119. 119
120. 120
121. 121
122. 122
123. 123
124. 124
125. 125
126. 126
127. 127
128. 128
129. 129
130. 130
131. 131
132. 132
133. 133
134. 134
135. 135
136. 136
137. 137
138. 138
139. 139
140. 140
141. 141
142. 142
143. 143
144. 144
145. 145
146. 146
147. 147
148. 148

package activitypub

import (
	"fmt"
)

type withObjectFn func (*Object) error
type withActivityFn func (*Activity) error
type withIntransitiveActivityFn func (*IntransitiveActivity) error
type withQuestionFn func (*Question) error
type withActorFn func (*Actor) error
type withCollectionInterfaceFn func (collection CollectionInterface) error
type withCollectionFn func (collection *Collection) error
type withCollectionPageFn func (*CollectionPage) error
type withOrderedCollectionFn func (*OrderedCollection) error
type withOrderedCollectionPageFn func (*OrderedCollectionPage) error
type withItemCollectionFn func (collection *ItemCollection) error

// OnObject
func OnObject(it Item, fn withObjectFn) error {
	ob, err  := ToObject(it)
	if err != nil {
		return err
	}
	return fn(ob)
}

// OnActivity
func OnActivity(it Item, fn withActivityFn) error {
	if !(ActivityTypes.Contains(it.GetType()) || IntransitiveActivityTypes.Contains(it.GetType())) {
		return fmt.Errorf("%T[%s] can't be converted to Activity", it, it.GetType())
	}
	act, err  := ToActivity(it)
	if err != nil {
		return err
	}
	return fn(act)
}

// OnIntransitiveActivity
func OnIntransitiveActivity(it Item, fn withIntransitiveActivityFn) error {
	if it.GetType() == QuestionType {
		fmt.Errorf("for %T[%s] you need to use OnQuestion function", it, it.GetType())
	}
	act, err  := ToIntransitiveActivity(it)
	if err != nil {
		return err
	}
	return fn(act)
}

// OnQuestion
func OnQuestion(it Item, fn withQuestionFn) error {
	if it.GetType() != QuestionType {
		fmt.Errorf("For %T[%s] can't be converted to Question", it, it.GetType())
	}
	act, err  := ToQuestion(it)
	if err != nil {
		return err
	}
	return fn(act)
}

// OnActor
func OnActor(it Item, fn withActorFn) error {
	if !ActorTypes.Contains(it.GetType()) {
		return fmt.Errorf("%T[%s] can't be converted to Person", it, it.GetType())
	}
	act, err  := ToActor(it)
	if err != nil {
		return err
	}
	return fn(act)
}

// OnCollection
func OnCollection(it Item, fn withCollectionInterfaceFn) error {
	switch it.GetType() {
	case CollectionOfItems:
		col, err := ToItemCollection(it)
		if err != nil {
			return err
		}
		c := Collection{
			TotalItems: uint(len(*col)),
			Items:      *col,
		}
		return fn(&c)
	case CollectionType:
		col, err := ToCollection(it)
		if err != nil {
			return err
		}
		return fn(col)
	case CollectionPageType:
		return OnCollectionPage(it, func(p *CollectionPage) error {
			col, err := ToCollection(p)
			if err != nil {
				return err
			}
			return fn(col)
		})
	default:
		return fmt.Errorf("%T[%s] can't be converted to Collection", it, it.GetType())
	}
}

// OnCollectionPage
func OnCollectionPage(it Item, fn withCollectionPageFn) error {
	if it.GetType() != CollectionPageType {
		return fmt.Errorf("%T[%s] can't be converted to Collection Page", it, it.GetType())
	}
	col, err  := ToCollectionPage(it)
	if err != nil {
		return err
	}
	return fn(col)
}

// OnOrderedCollection
func OnOrderedCollection(it Item, fn withOrderedCollectionFn) error {
	col, err := ToOrderedCollection(it)
	if err != nil {
		return err
	}
	return fn(col)
}

// OnOrderedCollectionPage
func OnOrderedCollectionPage(it Item, fn withOrderedCollectionPageFn) error {
	if it.GetType() != OrderedCollectionPageType {
		return fmt.Errorf("%T[%s] can't be converted to OrderedCollection Page", it, it.GetType())
	}
	col, err  := ToOrderedCollectionPage(it)
	if err != nil {
		return err
	}
	return fn(col)
}

// OnItemCollection
func OnItemCollection(it Item, fn withItemCollectionFn) error {
	col, err  := ToItemCollection(it)
	if err != nil {
		return err
	}
	return fn(col)
}