neo-go/pkg/core/mpt/empty.go
Anna Shaleva 6b21ad9922 *: replace interface{} with any keyword
Everywhere including examples, external interop APIs, bindings generators
code and in other valuable places. A couple of `interface{}` usages are
intentionally left in the CHANGELOG.md, documentation and tests.
2023-04-04 13:22:42 +03:00

59 lines
1.2 KiB
Go

package mpt
import (
"encoding/json"
"errors"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/util"
)
// EmptyNode represents an empty node.
type EmptyNode struct{}
// DecodeBinary implements the io.Serializable interface.
func (e EmptyNode) DecodeBinary(*io.BinReader) {
}
// EncodeBinary implements the 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]any
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{} }