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package git
import (
"io"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/plumbing/storer"
)
// Blob is used to store file data - it is generally a file.
type Blob struct {
Hash plumbing.Hash
Size int64
obj plumbing.Object
}
// ID returns the object ID of the blob. The returned value will always match
// the current value of Blob.Hash.
//
// ID is present to fulfill the Object interface.
func (b *Blob) ID() plumbing.Hash {
return b.Hash
}
// Type returns the type of object. It always returns plumbing.BlobObject.
//
// Type is present to fulfill the Object interface.
func (b *Blob) Type() plumbing.ObjectType {
return plumbing.BlobObject
}
// Decode transforms a plumbing.Object into a Blob struct.
func (b *Blob) Decode(o plumbing.Object) error {
if o.Type() != plumbing.BlobObject {
return ErrUnsupportedObject
}
b.Hash = o.Hash()
b.Size = o.Size()
b.obj = o
return nil
}
// Encode transforms a Blob into a plumbing.Object.
func (b *Blob) Encode(o plumbing.Object) error {
w, err := o.Writer()
if err != nil {
return err
}
defer checkClose(w, &err)
r, err := b.Reader()
if err != nil {
return err
}
defer checkClose(r, &err)
_, err = io.Copy(w, r)
o.SetType(plumbing.BlobObject)
return err
}
// Reader returns a reader allow the access to the content of the blob
func (b *Blob) Reader() (io.ReadCloser, error) {
return b.obj.Reader()
}
// BlobIter provides an iterator for a set of blobs.
type BlobIter struct {
storer.ObjectIter
r *Repository
}
// NewBlobIter returns a CommitIter for the given repository and underlying
// object iterator.
//
// The returned BlobIter will automatically skip over non-blob objects.
func NewBlobIter(r *Repository, iter storer.ObjectIter) *BlobIter {
return &BlobIter{iter, r}
}
// Next moves the iterator to the next blob and returns a pointer to it. If it
// has reached the end of the set it will return io.EOF.
func (iter *BlobIter) Next() (*Blob, error) {
for {
obj, err := iter.ObjectIter.Next()
if err != nil {
return nil, err
}
if obj.Type() != plumbing.BlobObject {
continue
}
blob := &Blob{}
return blob, blob.Decode(obj)
}
}
// ForEach call the cb function for each blob contained on this iter until
// an error happens or the end of the iter is reached. If ErrStop is sent
// the iteration is stop but no error is returned. The iterator is closed.
func (iter *BlobIter) ForEach(cb func(*Blob) error) error {
return iter.ObjectIter.ForEach(func(obj plumbing.Object) error {
if obj.Type() != plumbing.BlobObject {
return nil
}
blob := &Blob{}
if err := blob.Decode(obj); err != nil {
return err
}
return cb(blob)
})
}
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