mirror of
https://github.com/restic/restic.git
synced 2024-08-21 03:43:22 +02:00
92 lines
1.9 KiB
Go
92 lines
1.9 KiB
Go
package restic
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"sort"
|
|
|
|
"github.com/restic/restic/backend"
|
|
"github.com/restic/restic/debug"
|
|
"github.com/restic/restic/pack"
|
|
"github.com/restic/restic/repo"
|
|
)
|
|
|
|
type Tree struct {
|
|
Nodes []*Node `json:"nodes"`
|
|
}
|
|
|
|
var (
|
|
ErrNodeNotFound = errors.New("named node not found")
|
|
ErrNodeAlreadyInTree = errors.New("node already present")
|
|
)
|
|
|
|
func NewTree() *Tree {
|
|
return &Tree{
|
|
Nodes: []*Node{},
|
|
}
|
|
}
|
|
|
|
func (t Tree) String() string {
|
|
return fmt.Sprintf("Tree<%d nodes>", len(t.Nodes))
|
|
}
|
|
|
|
func LoadTree(repo *repo.Repo, id backend.ID) (*Tree, error) {
|
|
tree := &Tree{}
|
|
err := repo.LoadJSONPack(pack.Tree, id, tree)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return tree, nil
|
|
}
|
|
|
|
// Equals returns true if t and other have exactly the same nodes.
|
|
func (t Tree) Equals(other *Tree) bool {
|
|
if len(t.Nodes) != len(other.Nodes) {
|
|
debug.Log("Tree.Equals", "tree.Equals(): trees have different number of nodes")
|
|
return false
|
|
}
|
|
|
|
for i := 0; i < len(t.Nodes); i++ {
|
|
if !t.Nodes[i].Equals(*other.Nodes[i]) {
|
|
debug.Log("Tree.Equals", "tree.Equals(): node %d is different:", i)
|
|
debug.Log("Tree.Equals", " %#v", t.Nodes[i])
|
|
debug.Log("Tree.Equals", " %#v", other.Nodes[i])
|
|
return false
|
|
}
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func (t *Tree) Insert(node *Node) error {
|
|
pos, _, err := t.binarySearch(node.Name)
|
|
if err == nil {
|
|
return ErrNodeAlreadyInTree
|
|
}
|
|
|
|
// https://code.google.com/p/go-wiki/wiki/SliceTricks
|
|
t.Nodes = append(t.Nodes, &Node{})
|
|
copy(t.Nodes[pos+1:], t.Nodes[pos:])
|
|
t.Nodes[pos] = node
|
|
|
|
return nil
|
|
}
|
|
|
|
func (t Tree) binarySearch(name string) (int, *Node, error) {
|
|
pos := sort.Search(len(t.Nodes), func(i int) bool {
|
|
return t.Nodes[i].Name >= name
|
|
})
|
|
|
|
if pos < len(t.Nodes) && t.Nodes[pos].Name == name {
|
|
return pos, t.Nodes[pos], nil
|
|
}
|
|
|
|
return pos, nil, ErrNodeNotFound
|
|
}
|
|
|
|
func (t Tree) Find(name string) (*Node, error) {
|
|
_, node, err := t.binarySearch(name)
|
|
return node, err
|
|
}
|