From 6f22cffb6bada5024a1a7591800a1284ceec7247 Mon Sep 17 00:00:00 2001
From: vyzo <vyzo@hackzen.org>
Date: Fri, 30 Jul 2021 09:38:09 +0300
Subject: [PATCH] object visitor interface

---
 blockstore/splitstore/visitor.go | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 blockstore/splitstore/visitor.go

diff --git a/blockstore/splitstore/visitor.go b/blockstore/splitstore/visitor.go
new file mode 100644
index 000000000..4c9f1d49f
--- /dev/null
+++ b/blockstore/splitstore/visitor.go
@@ -0,0 +1,28 @@
+package splitstore
+
+import (
+	cid "github.com/ipfs/go-cid"
+)
+
+// ObjectVisitor is an interface for deduplicating objects during walks
+type ObjectVisitor interface {
+	Visit(cid.Cid) (bool, error)
+}
+
+type noopVisitor struct{}
+
+var _ ObjectVisitor = (*noopVisitor)(nil)
+
+func (v *noopVisitor) Visit(_ cid.Cid) (bool, error) {
+	return true, nil
+}
+
+type cidSetVisitor struct {
+	set *cid.Set
+}
+
+var _ ObjectVisitor = (*cidSetVisitor)(nil)
+
+func (v *cidSetVisitor) Visit(c cid.Cid) (bool, error) {
+	return v.set.Visit(c), nil
+}