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value.go
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/
value.go
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/*
* Copyright 2016 Dgraph Labs, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package client
import (
"encoding/binary"
"fmt"
"time"
"github.com/dgraph-io/dgraph/query/graph"
"github.com/dgraph-io/dgraph/types"
geom "github.com/twpayne/go-geom"
"github.com/twpayne/go-geom/encoding/geojson"
"github.com/twpayne/go-geom/encoding/wkb"
)
// ValueFromJson converts geojson into a client.Value
// Example usage
// req := client.Req{}
// loc, err := client.ValueFromGeoJson(`{"type":"Point","coordinates":[-122.2207184,37.72129059]}`)
// if err != nil {
// log.Fatal(err)
// }
//
// if err := req.AddMutation(graph.NQuad{
// Subject: "alice",
// Predicate: "birthday",
// ObjectValue: loc,
// }, client.SET); err != nil {
// log.Fatal(err)
// }
//
func ValueFromGeoJson(json string) (*graph.Value, error) {
var g geom.T
// Parse the json
err := geojson.Unmarshal([]byte(json), &g)
if err != nil {
return &graph.Value{}, err
}
// parse the geometry object to WKB
b, err := wkb.Marshal(g, binary.LittleEndian)
if err != nil {
return &graph.Value{}, err
}
geo, err := types.ObjectValue(types.GeoID, b)
if err != nil {
return &graph.Value{}, err
}
return geo, nil
}
func Date(date time.Time) (*graph.Value, error) {
b, err := date.MarshalBinary()
if err != nil {
return &graph.Value{}, err
}
d, err := types.ObjectValue(types.DateID, b)
if err != nil {
return &graph.Value{}, err
}
return d, nil
}
func Datetime(date time.Time) (*graph.Value, error) {
b, err := date.MarshalBinary()
if err != nil {
return &graph.Value{}, err
}
d, err := types.ObjectValue(types.DateTimeID, b)
if err != nil {
return &graph.Value{}, err
}
return d, nil
}
// Uid converts an uint64 to a string, which can be used as part of
// Subject and ObjectId fields in the graph.NQuad
func Uid(uid uint64) string {
return fmt.Sprintf("%#x", uid)
}