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package core
import (
"bytes"
"io"
)
// Object is a generic representation of any git object
type Object interface {
Type() ObjectType
SetType(ObjectType)
Size() int64
SetSize(int64)
Hash() Hash
Reader() io.Reader
Writer() io.Writer
}
// ObjectStorage generic storage of objects
type ObjectStorage interface {
New() Object
Set(Object) Hash
Get(Hash) (Object, bool)
}
// ObjectType internal object type's
type ObjectType int8
const (
CommitObject ObjectType = 1
TreeObject ObjectType = 2
BlobObject ObjectType = 3
TagObject ObjectType = 4
OFSDeltaObject ObjectType = 6
REFDeltaObject ObjectType = 7
)
func (t ObjectType) String() string {
switch t {
case CommitObject:
return "commit"
case TreeObject:
return "tree"
case BlobObject:
return "blob"
default:
return "-"
}
}
func (t ObjectType) Bytes() []byte {
return []byte(t.String())
}
type RAWObject struct {
b []byte
t ObjectType
s int64
}
func (o *RAWObject) Type() ObjectType { return o.t }
func (o *RAWObject) SetType(t ObjectType) { o.t = t }
func (o *RAWObject) Size() int64 { return o.s }
func (o *RAWObject) SetSize(s int64) { o.s = s }
func (o *RAWObject) Reader() io.Reader { return bytes.NewBuffer(o.b) }
func (o *RAWObject) Hash() Hash { return ComputeHash(o.t, o.b) }
func (o *RAWObject) Writer() io.Writer { return o }
func (o *RAWObject) Write(p []byte) (n int, err error) {
o.b = append(o.b, p...)
return len(p), nil
}
type RAWObjectStorage struct {
Objects map[Hash]Object
Commits map[Hash]Object
Trees map[Hash]Object
Blobs map[Hash]Object
}
func NewRAWObjectStorage() *RAWObjectStorage {
return &RAWObjectStorage{
Objects: make(map[Hash]Object, 0),
Commits: make(map[Hash]Object, 0),
Trees: make(map[Hash]Object, 0),
Blobs: make(map[Hash]Object, 0),
}
}
func (o *RAWObjectStorage) New() Object {
return &RAWObject{}
}
func (o *RAWObjectStorage) Set(obj Object) Hash {
h := obj.Hash()
o.Objects[h] = obj
switch obj.Type() {
case CommitObject:
o.Commits[h] = o.Objects[h]
case TreeObject:
o.Trees[h] = o.Objects[h]
case BlobObject:
o.Blobs[h] = o.Objects[h]
}
return h
}
func (o *RAWObjectStorage) Get(h Hash) (Object, bool) {
obj, ok := o.Objects[h]
return obj, ok
}
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