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tiddler_repo.go
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/
tiddler_repo.go
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package main
import "fmt"
type TiddlerRepo interface {
List() []Tiddler
Get(key string) (Tiddler, bool)
Put(tiddler Tiddler) (int, error)
Remove(key string) error
}
type inMemRepo struct {
tiddlers map[string]Tiddler
}
func InMemory() TiddlerRepo {
return inMemRepo{tiddlers: make(map[string]Tiddler)}
}
func (repo inMemRepo) List() []Tiddler {
var list = make([]Tiddler, len(repo.tiddlers))
i := 0
for _, tiddler := range repo.tiddlers {
list[i] = tiddler
i++
}
return list
}
func (repo inMemRepo) Get(key string) (tiddler Tiddler, ok bool) {
tiddler, ok = repo.tiddlers[key]
return
}
func (repo inMemRepo) Put(tiddler Tiddler) (int, error) {
var rev int
if prev, ok := repo.Get(tiddler.Title); ok {
rev = prev.Revision
rev++
}
tiddler.Revision = rev
repo.tiddlers[tiddler.Title] = tiddler
return rev, nil
}
func (repo inMemRepo) Remove(key string) error {
_, ok := repo.tiddlers[key]
if !ok {
return fmt.Errorf("Key %v does not exist in repo", key)
}
delete(repo.tiddlers, key)
return nil
}
type Tiddler struct {
Title string
Meta []byte
Text string
Revision int
}