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// package plumbing implement the core interfaces and structs used by go-git
package plumbing
import (
"errors"
"io"
)
var (
ErrObjectNotFound = errors.New("object not found")
// ErrInvalidType is returned when an invalid object type is provided.
ErrInvalidType = errors.New("invalid object type")
)
// Object is a generic representation of any git object
type EncodedObject interface {
Hash() Hash
Type() ObjectType
SetType(ObjectType)
Size() int64
SetSize(int64)
Reader() (io.ReadCloser, error)
Writer() (io.WriteCloser, error)
}
// DeltaObject is an EncodedObject representing a delta.
type DeltaObject interface {
EncodedObject
// BaseHash returns the hash of the object used as base for this delta.
BaseHash() Hash
// ActualHash returns the hash of the object after applying the delta.
ActualHash() Hash
// Size returns the size of the object after applying the delta.
ActualSize() int64
}
// ObjectType internal object type
// Integer values from 0 to 7 map to those exposed by git.
// AnyObject is used to represent any from 0 to 7.
type ObjectType int8
const (
InvalidObject ObjectType = 0
CommitObject ObjectType = 1
TreeObject ObjectType = 2
BlobObject ObjectType = 3
TagObject ObjectType = 4
// 5 reserved for future expansion
OFSDeltaObject ObjectType = 6
REFDeltaObject ObjectType = 7
AnyObject ObjectType = -127
)
func (t ObjectType) String() string {
switch t {
case CommitObject:
return "commit"
case TreeObject:
return "tree"
case BlobObject:
return "blob"
case TagObject:
return "tag"
case OFSDeltaObject:
return "ofs-delta"
case REFDeltaObject:
return "ref-delta"
case AnyObject:
return "any"
default:
return "unknown"
}
}
func (t ObjectType) Bytes() []byte {
return []byte(t.String())
}
// Valid returns true if t is a valid ObjectType.
func (t ObjectType) Valid() bool {
return t >= CommitObject && t <= REFDeltaObject
}
// IsDelta returns true for any ObjectTyoe that represents a delta (i.e.
// REFDeltaObject or OFSDeltaObject).
func (t ObjectType) IsDelta() bool {
return t == REFDeltaObject || t == OFSDeltaObject
}
// ParseObjectType parses a string representation of ObjectType. It returns an
// error on parse failure.
func ParseObjectType(value string) (typ ObjectType, err error) {
switch value {
case "commit":
typ = CommitObject
case "tree":
typ = TreeObject
case "blob":
typ = BlobObject
case "tag":
typ = TagObject
case "ofs-delta":
typ = OFSDeltaObject
case "ref-delta":
typ = REFDeltaObject
default:
err = ErrInvalidType
}
return
}
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