storage: Storage entity support, and DotGit support for References

1 files changed, 61 insertions, 0 deletions

diff --git a/storage/filesystem/reference.go b/storage/filesystem/reference.go
new file mode 100644
index 0000000..c8e5434
--- /dev/null
+++ b/storage/filesystem/reference.go
@@ -0,0 +1,61 @@
+package filesystem
+
+import (
+	"fmt"
+
+	"gopkg.in/src-d/go-git.v4/core"
+	"gopkg.in/src-d/go-git.v4/storage/filesystem/internal/dotgit"
+)
+
+type ReferenceStorage struct {
+	dir  *dotgit.DotGit
+	refs map[core.ReferenceName]*core.Reference
+}
+
+func (r *ReferenceStorage) Set(ref *core.Reference) error {
+	return fmt.Errorf("not implemented yet")
+}
+
+func (r *ReferenceStorage) Get(n core.ReferenceName) (*core.Reference, error) {
+	if err := r.load(); err != nil {
+		return nil, err
+	}
+
+	ref, ok := r.refs[n]
+	if !ok {
+		return nil, core.ErrReferenceNotFound
+	}
+
+	return ref, nil
+}
+
+func (r *ReferenceStorage) Iter() (core.ReferenceIter, error) {
+	if err := r.load(); err != nil {
+		return nil, err
+	}
+
+	var refs []*core.Reference
+	for _, ref := range r.refs {
+		refs = append(refs, ref)
+	}
+
+	return core.NewReferenceSliceIter(refs), nil
+}
+
+func (r *ReferenceStorage) load() error {
+	if len(r.refs) != 0 {
+		return nil
+	}
+
+	refs, err := r.dir.Refs()
+	if err != nil {
+		return err
+	}
+
+	r.refs = make(map[core.ReferenceName]*core.Reference, 0)
+	for _, ref := range refs {
+		r.refs[ref.Name()] = ref
+	}
+
+	return nil
+}