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Use array instead of hash for backend.ID

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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.
This commit is contained in:
Alexander Neumann 2015-07-25 17:05:45 +02:00
parent 2fa6124545
commit 5cdcc99eba
31 changed files with 244 additions and 208 deletions
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17
repository/blob.go
View file

@ -1,17 +1,16 @@
package repository
import (
"bytes"
"fmt"
"github.com/restic/restic/backend"
)
type Blob struct {
ID backend.ID `json:"id,omitempty"`
Size uint64 `json:"size,omitempty"`
Storage backend.ID `json:"sid,omitempty"` // encrypted ID
StorageSize uint64 `json:"ssize,omitempty"` // encrypted Size
ID *backend.ID `json:"id,omitempty"`
Size uint64 `json:"size,omitempty"`
Storage *backend.ID `json:"sid,omitempty"` // encrypted ID
StorageSize uint64 `json:"ssize,omitempty"` // encrypted Size
}
type Blobs []Blob
@ -32,15 +31,15 @@ func (b Blob) String() string {
// Compare compares two blobs by comparing the ID and the size. It returns -1,
// 0, or 1.
func (blob Blob) Compare(other Blob) int {
if res := bytes.Compare(other.ID, blob.ID); res != 0 {
func (b Blob) Compare(other Blob) int {
if res := b.ID.Compare(*other.ID); res != 0 {
return res
}
if blob.Size < other.Size {
if b.Size < other.Size {
return -1
}
if blob.Size > other.Size {
if b.Size > other.Size {
return 1
}