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