boards.gno

 1package storage
 2
 3import (
 4	"strconv"
 5
 6	"gno.land/p/nt/avl"
 7)
 8
 9var boards avl.Tree
10
11type Board interface {
12	AddPost(title, content string)
13	GetPost(id int) (Post, bool)
14	Size() int
15}
16
17// posts are persisted in an avl tree
18type TreeBoard struct {
19	id    int
20	posts *avl.Tree
21}
22
23func (b *TreeBoard) AddPost(title, content string) {
24	n := b.posts.Size()
25	p := Post{n, title, content}
26	b.posts.Set(strconv.Itoa(n), p)
27}
28
29func (b *TreeBoard) GetPost(id int) (Post, bool) {
30	p, ok := b.posts.Get(strconv.Itoa(id))
31	if ok {
32		return p.(Post), ok
33	} else {
34		return Post{}, ok
35	}
36}
37
38func (b *TreeBoard) Size() int {
39	return b.posts.Size()
40}
41
42// posts are persisted in a map
43type MapBoard struct {
44	id    int
45	posts map[int]Post
46}
47
48func (b *MapBoard) AddPost(title, content string) {
49	n := len(b.posts)
50	p := Post{n, title, content}
51	b.posts[n] = p
52}
53
54func (b *MapBoard) GetPost(id int) (Post, bool) {
55	p, ok := b.posts[id]
56	if ok {
57		return p, ok
58	} else {
59		return Post{}, ok
60	}
61}
62
63func (b *MapBoard) Size() int {
64	return len(b.posts)
65}
66
67// posts are persisted in a slice
68type SliceBoard struct {
69	id    int
70	posts []Post
71}
72
73func (b *SliceBoard) AddPost(title, content string) {
74	n := len(b.posts)
75	p := Post{n, title, content}
76	b.posts = append(b.posts, p)
77}
78
79func (b *SliceBoard) GetPost(id int) (Post, bool) {
80	if id < len(b.posts) {
81		p := b.posts[id]
82
83		return p, true
84	} else {
85		return Post{}, false
86	}
87}
88
89func (b *SliceBoard) Size() int {
90	return len(b.posts)
91}
92
93type Post struct {
94	id      int
95	title   string
96	content string
97}