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55 lines
1.4 KiB
55 lines
1.4 KiB
// Copyright 2012-present Oliver Eilhard. All rights reserved.
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// Use of this source code is governed by a MIT-license.
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// See http://olivere.mit-license.org/license.txt for details.
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package elastic
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import (
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"encoding/json"
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"fmt"
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"strconv"
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"strings"
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)
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// GeoPoint is a geographic position described via latitude and longitude.
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type GeoPoint struct {
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Lat float64 `json:"lat"`
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Lon float64 `json:"lon"`
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}
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// Source returns the object to be serialized in Elasticsearch DSL.
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func (pt *GeoPoint) Source() map[string]float64 {
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return map[string]float64{
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"lat": pt.Lat,
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"lon": pt.Lon,
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}
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}
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// MarshalJSON encodes the GeoPoint to JSON.
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func (pt *GeoPoint) MarshalJSON() ([]byte, error) {
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return json.Marshal(pt.Source())
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}
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// GeoPointFromLatLon initializes a new GeoPoint by latitude and longitude.
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func GeoPointFromLatLon(lat, lon float64) *GeoPoint {
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return &GeoPoint{Lat: lat, Lon: lon}
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}
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// GeoPointFromString initializes a new GeoPoint by a string that is
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// formatted as "{latitude},{longitude}", e.g. "40.10210,-70.12091".
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func GeoPointFromString(latLon string) (*GeoPoint, error) {
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latlon := strings.SplitN(latLon, ",", 2)
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if len(latlon) != 2 {
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return nil, fmt.Errorf("elastic: %s is not a valid geo point string", latLon)
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}
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lat, err := strconv.ParseFloat(latlon[0], 64)
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if err != nil {
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return nil, err
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}
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lon, err := strconv.ParseFloat(latlon[1], 64)
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if err != nil {
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return nil, err
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}
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return &GeoPoint{Lat: lat, Lon: lon}, nil
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}
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