package mpt import ( "encoding/json" "errors" "github.com/nspcc-dev/neo-go/pkg/io" "github.com/nspcc-dev/neo-go/pkg/util" ) // EmptyNode represents empty node. type EmptyNode struct{} // DecodeBinary implements io.Serializable interface. func (e EmptyNode) DecodeBinary(*io.BinReader) { } // EncodeBinary implements io.Serializable interface. func (e EmptyNode) EncodeBinary(*io.BinWriter) { } // Size implements Node interface. func (EmptyNode) Size() int { return 0 } // MarshalJSON implements Node interface. func (e EmptyNode) MarshalJSON() ([]byte, error) { return []byte(`{}`), nil } // UnmarshalJSON implements Node interface. func (e EmptyNode) UnmarshalJSON(bytes []byte) error { var m map[string]interface{} err := json.Unmarshal(bytes, &m) if err != nil { return err } if len(m) != 0 { return errors.New("expected empty node") } return nil } // Hash implements Node interface. func (e EmptyNode) Hash() util.Uint256 { panic("can't get hash of an EmptyNode") } // Type implements Node interface. func (e EmptyNode) Type() NodeType { return EmptyT } // Bytes implements Node interface. func (e EmptyNode) Bytes() []byte { return nil } // Clone implements Node interface. func (EmptyNode) Clone() Node { return EmptyNode{} }