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// Copyright 2019-present Facebook Inc. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.
package graph
import (
type (
// An Edge between two vertices.
Edge struct {
OutV, InV Vertex
// graphson edge repr.
edge struct {
OutV interface{} `json:"outV"`
OutVLabel string `json:"outVLabel"`
InV interface{} `json:"inV"`
InVLabel string `json:"inVLabel"`
// NewEdge create a new graph edge.
func NewEdge(id interface{}, label string, outV, inV Vertex) Edge {
return Edge{
Element: NewElement(id, label),
OutV: outV,
InV: inV,
// String implements fmt.Stringer interface.
func (e Edge) String() string {
return fmt.Sprintf("e[%v][%v-%s->%v]", e.ID, e.OutV.ID, e.Label, e.InV.ID)
// MarshalGraphson implements graphson.Marshaler interface.
func (e Edge) MarshalGraphson() ([]byte, error) {
return graphson.Marshal(edge{
Element: e.Element,
OutV: e.OutV.ID,
OutVLabel: e.OutV.Label,
InV: e.InV.ID,
InVLabel: e.InV.Label,
// UnmarshalGraphson implements graphson.Unmarshaler interface.
func (e *Edge) UnmarshalGraphson(data []byte) error {
var edge edge
if err := graphson.Unmarshal(data, &edge); err != nil {
return errors.Wrap(err, "unmarshaling edge")
*e = NewEdge(
edge.ID, edge.Label,
NewVertex(edge.OutV, edge.OutVLabel),
NewVertex(edge.InV, edge.InVLabel),
return nil
// GraphsonType implements graphson.Typer interface.
func (edge) GraphsonType() graphson.Type {
return "g:Edge"
// Property denotes a key/value pair associated with an edge.
type Property struct {
Key string `json:"key"`
Value interface{} `json:"value"`
// NewProperty create a new graph edge property.
func NewProperty(key string, value interface{}) Property {
return Property{key, value}
// GraphsonType implements graphson.Typer interface.
func (Property) GraphsonType() graphson.Type {
return "g:Property"
// String implements fmt.Stringer interface.
func (p Property) String() string {
return fmt.Sprintf("p[%s->%v]", p.Key, p.Value)
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