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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)
Iter(ObjectType) ObjectIter
}
// 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())
}
// ObjectIter is a generic closable interface for iterating over objects.
type ObjectIter interface {
Next() (Object, error)
Close()
}
// ObjectLookupIter yields a series of objects by retrieving each one from
// object storage.
type ObjectLookupIter struct {
storage ObjectStorage
series []Hash
pos int
}
// NewObjectLookupIter returns an object iterator given an object storage and
// a slice of object hashes.
func NewObjectLookupIter(storage ObjectStorage, series []Hash) *ObjectLookupIter {
return &ObjectLookupIter{
storage: storage,
series: series,
}
}
// Next returns the next object from the iterator. If the iterator has reached
// the end it will return io.EOF as an error. If the object is retreieved
// successfully error will be nil.
func (iter *ObjectLookupIter) Next() (Object, error) {
if iter.pos >= len(iter.series) {
return nil, io.EOF
}
hash := iter.series[iter.pos]
obj, ok := iter.storage.Get(hash)
if !ok {
// FIXME: Consider making ObjectStorage.Get return an actual error that we
// could pass back here.
return nil, io.EOF
}
iter.pos++
return obj, nil
}
// Close releases any resources used by the iterator.
func (iter *ObjectLookupIter) Close() {
iter.pos = len(iter.series)
}
// ObjectSliceIter yields a series of objects from a slice of objects.
type ObjectSliceIter struct {
series []Object
pos int
}
// NewObjectSliceIter returns an object iterator for the given slice of objects.
func NewObjectSliceIter(series []Object) *ObjectSliceIter {
return &ObjectSliceIter{
series: series,
}
}
// Next returns the next object from the iterator. If the iterator has reached
// the end it will return io.EOF as an error. If the object is retreieved
// successfully error will be nil.
func (iter *ObjectSliceIter) Next() (Object, error) {
if iter.pos >= len(iter.series) {
return nil, io.EOF
}
obj := iter.series[iter.pos]
iter.pos++
return obj, nil
}
// Close releases any resources used by the iterator.
func (iter *ObjectSliceIter) Close() {
iter.pos = len(iter.series)
}
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
}
func (o *RAWObjectStorage) Iter(t ObjectType) ObjectIter {
var series []Object
switch t {
case CommitObject:
series = flattenObjectMap(o.Commits)
case TreeObject:
series = flattenObjectMap(o.Trees)
case BlobObject:
series = flattenObjectMap(o.Blobs)
}
return NewObjectSliceIter(series)
}
func flattenObjectMap(m map[Hash]Object) []Object {
objects := make([]Object, 0, len(m))
for _, obj := range m {
objects = append(objects, obj)
}
return objects
}
|
