1package bug
 2
 3import (
 4	"bytes"
 5	"encoding/gob"
 6	"github.com/MichaelMure/git-bug/repository"
 7	"github.com/MichaelMure/git-bug/util"
 8)
 9
10// OperationPack represent an ordered set of operation to apply
11// to a Bug. These operations are stored in a single Git commit.
12//
13// These commits will be linked together in a linear chain of commits
14// inside Git to form the complete ordered chain of operation to
15// apply to get the final state of the Bug
16type OperationPack struct {
17	Operations []Operation
18}
19
20func ParseOperationPack(data []byte) (*OperationPack, error) {
21	reader := bytes.NewReader(data)
22	decoder := gob.NewDecoder(reader)
23
24	var opp OperationPack
25
26	err := decoder.Decode(&opp)
27
28	if err != nil {
29		return nil, err
30	}
31
32	return &opp, nil
33}
34
35func (opp *OperationPack) Serialize() ([]byte, error) {
36	var data bytes.Buffer
37
38	encoder := gob.NewEncoder(&data)
39	err := encoder.Encode(*opp)
40
41	if err != nil {
42		return nil, err
43	}
44
45	return data.Bytes(), nil
46}
47
48// Append a new operation to the pack
49func (opp *OperationPack) Append(op Operation) {
50	opp.Operations = append(opp.Operations, op)
51}
52
53func (opp *OperationPack) IsEmpty() bool {
54	return len(opp.Operations) == 0
55}
56
57func (opp *OperationPack) IsValid() bool {
58	return !opp.IsEmpty()
59}
60
61func (opp *OperationPack) Write(repo repository.Repo) (util.Hash, error) {
62	data, err := opp.Serialize()
63
64	if err != nil {
65		return "", err
66	}
67
68	hash, err := repo.StoreData(data)
69
70	if err != nil {
71		return "", err
72	}
73
74	return hash, nil
75}