forked from TrueCloudLab/neoneo-go
db80ef28df
We use them quite frequently (consider children for a new branch node) and it is better to get rid of unneeded allocations. Signed-off-by: Evgeniy Stratonikov <evgeniy@nspcc.ru>
53 lines
1.1 KiB
Go
53 lines
1.1 KiB
Go
package mpt
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import (
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"encoding/json"
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"errors"
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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/util"
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)
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// EmptyNode represents empty node.
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type EmptyNode struct{}
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// DecodeBinary implements io.Serializable interface.
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func (e EmptyNode) DecodeBinary(*io.BinReader) {
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}
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// EncodeBinary implements io.Serializable interface.
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func (e EmptyNode) EncodeBinary(*io.BinWriter) {
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}
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// MarshalJSON implements Node interface.
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func (e EmptyNode) MarshalJSON() ([]byte, error) {
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return []byte(`{}`), nil
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}
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// UnmarshalJSON implements Node interface.
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func (e EmptyNode) UnmarshalJSON(bytes []byte) error {
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var m map[string]interface{}
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err := json.Unmarshal(bytes, &m)
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if err != nil {
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return err
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}
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if len(m) != 0 {
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return errors.New("expected empty node")
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}
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return nil
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}
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// Hash implements Node interface.
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func (e EmptyNode) Hash() util.Uint256 {
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panic("can't get hash of an EmptyNode")
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}
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// Type implements Node interface.
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func (e EmptyNode) Type() NodeType {
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return EmptyT
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}
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// Bytes implements Node interface.
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func (e EmptyNode) Bytes() []byte {
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return nil
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}
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