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package commitgraph
import (
"math"
"time"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/object"
"github.com/go-git/go-git/v5/plumbing/storer"
)
// objectCommitNode is a representation of Commit as presented in the GIT object format.
//
// objectCommitNode implements the CommitNode interface.
type objectCommitNode struct {
nodeIndex CommitNodeIndex
commit *object.Commit
}
// NewObjectCommitNodeIndex returns CommitNodeIndex implementation that uses
// only object storage to load the nodes
func NewObjectCommitNodeIndex(s storer.EncodedObjectStorer) CommitNodeIndex {
return &objectCommitNodeIndex{s}
}
func (oci *objectCommitNodeIndex) Get(hash plumbing.Hash) (CommitNode, error) {
commit, err := object.GetCommit(oci.s, hash)
if err != nil {
return nil, err
}
return &objectCommitNode{
nodeIndex: oci,
commit: commit,
}, nil
}
// objectCommitNodeIndex is an index that can load CommitNode objects only from the
// object store.
//
// objectCommitNodeIndex implements the CommitNodeIndex interface
type objectCommitNodeIndex struct {
s storer.EncodedObjectStorer
}
func (c *objectCommitNode) CommitTime() time.Time {
return c.commit.Committer.When
}
func (c *objectCommitNode) ID() plumbing.Hash {
return c.commit.ID()
}
func (c *objectCommitNode) Tree() (*object.Tree, error) {
return c.commit.Tree()
}
func (c *objectCommitNode) NumParents() int {
return c.commit.NumParents()
}
func (c *objectCommitNode) ParentNodes() CommitNodeIter {
return newParentgraphCommitNodeIter(c)
}
func (c *objectCommitNode) ParentNode(i int) (CommitNode, error) {
if i < 0 || i >= len(c.commit.ParentHashes) {
return nil, object.ErrParentNotFound
}
// Note: It's necessary to go through CommitNodeIndex here to ensure
// that if the commit-graph file covers only part of the history we
// start using it when that part is reached.
return c.nodeIndex.Get(c.commit.ParentHashes[i])
}
func (c *objectCommitNode) ParentHashes() []plumbing.Hash {
return c.commit.ParentHashes
}
func (c *objectCommitNode) Generation() uint64 {
// Commit nodes representing objects outside of the commit graph can never
// be reached by objects from the commit-graph thus we return the highest
// possible value.
return math.MaxUint64
}
func (c *objectCommitNode) GenerationV2() uint64 {
// Commit nodes representing objects outside of the commit graph can never
// be reached by objects from the commit-graph thus we return the highest
// possible value.
return math.MaxUint64
}
func (c *objectCommitNode) Commit() (*object.Commit, error) {
return c.commit, nil
}
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