2
2
mirror of https://github.com/octoleo/restic.git synced 2024-12-23 03:18:55 +00:00
restic/backend/id_set.go
Alexander Neumann 203a911de9 Refactor repository structure
Merge Map data type into Tree.
2015-01-14 16:34:30 +01:00

69 lines
955 B
Go

package backend
import (
"errors"
"sort"
"sync"
)
type IDSet struct {
list IDs
m sync.Mutex
}
func NewIDSet() *IDSet {
return &IDSet{
list: make(IDs, 0),
}
}
func (s *IDSet) find(id ID) (int, error) {
pos := sort.Search(len(s.list), func(i int) bool {
return id.Compare(s.list[i]) >= 0
})
if pos < len(s.list) {
candID := s.list[pos]
if id.Compare(candID) == 0 {
return pos, nil
}
}
return pos, errors.New("ID not found")
}
func (s *IDSet) insert(id ID) {
pos, err := s.find(id)
if err == nil {
// already present
return
}
// insert blob
// https://code.google.com/p/go-wiki/wiki/SliceTricks
s.list = append(s.list, ID{})
copy(s.list[pos+1:], s.list[pos:])
s.list[pos] = id
return
}
func (s *IDSet) Insert(id ID) {
s.m.Lock()
defer s.m.Unlock()
s.insert(id)
}
func (s *IDSet) Find(id ID) error {
s.m.Lock()
defer s.m.Unlock()
_, err := s.find(id)
if err != nil {
return err
}
return nil
}