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https://github.com/restic/restic.git
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5cdcc99eba
Since backend.ID is always a slice of constant length, use an array
instead of a slice. Mostly, arrays behave as slices, except that an
array cannot be nil, so use `*backend.ID` insteaf of `backend.ID` in
places where the absence of an ID is possible (e.g. for the Subtree of a
Node, which may not present when the node is a file node).
This change allows to directly use backend.ID as the the key for a map,
so that arbitrary data structures (e.g. a Set implemented as a
map[backend.ID]struct{}) can easily be formed.
102 lines
2.2 KiB
Go
102 lines
2.2 KiB
Go
package restic
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import (
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"errors"
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"fmt"
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"sort"
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"github.com/restic/restic/backend"
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"github.com/restic/restic/debug"
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"github.com/restic/restic/pack"
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"github.com/restic/restic/repository"
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)
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type Tree struct {
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Nodes []*Node `json:"nodes"`
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}
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var (
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ErrNodeNotFound = errors.New("named node not found")
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ErrNodeAlreadyInTree = errors.New("node already present")
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)
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func NewTree() *Tree {
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return &Tree{
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Nodes: []*Node{},
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}
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}
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func (t Tree) String() string {
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return fmt.Sprintf("Tree<%d nodes>", len(t.Nodes))
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}
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func LoadTree(repo *repository.Repository, id backend.ID) (*Tree, error) {
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tree := &Tree{}
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err := repo.LoadJSONPack(pack.Tree, id, tree)
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if err != nil {
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return nil, err
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}
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return tree, nil
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}
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// Equals returns true if t and other have exactly the same nodes.
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func (t Tree) Equals(other *Tree) bool {
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if len(t.Nodes) != len(other.Nodes) {
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debug.Log("Tree.Equals", "tree.Equals(): trees have different number of nodes")
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return false
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}
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for i := 0; i < len(t.Nodes); i++ {
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if !t.Nodes[i].Equals(*other.Nodes[i]) {
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debug.Log("Tree.Equals", "tree.Equals(): node %d is different:", i)
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debug.Log("Tree.Equals", " %#v", t.Nodes[i])
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debug.Log("Tree.Equals", " %#v", other.Nodes[i])
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return false
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}
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}
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return true
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}
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func (t *Tree) Insert(node *Node) error {
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pos, _, err := t.binarySearch(node.Name)
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if err == nil {
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return ErrNodeAlreadyInTree
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}
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// https://code.google.com/p/go-wiki/wiki/SliceTricks
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t.Nodes = append(t.Nodes, &Node{})
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copy(t.Nodes[pos+1:], t.Nodes[pos:])
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t.Nodes[pos] = node
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return nil
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}
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func (t Tree) binarySearch(name string) (int, *Node, error) {
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pos := sort.Search(len(t.Nodes), func(i int) bool {
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return t.Nodes[i].Name >= name
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})
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if pos < len(t.Nodes) && t.Nodes[pos].Name == name {
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return pos, t.Nodes[pos], nil
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}
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return pos, nil, ErrNodeNotFound
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}
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func (t Tree) Find(name string) (*Node, error) {
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_, node, err := t.binarySearch(name)
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return node, err
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}
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// Subtrees returns a slice of all subtree IDs of the tree.
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func (t Tree) Subtrees() (trees backend.IDs) {
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for _, node := range t.Nodes {
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if node.Type == "dir" && node.Subtree != nil {
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trees = append(trees, *node.Subtree)
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}
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}
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return trees
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}
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