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// Copyright 2012-2015 Oliver Eilhard. All rights reserved.
// Use of this source code is governed by a MIT-license.
// See http://olivere.mit-license.org/license.txt for details.
package elastic
// GeoDistanceAggregation is a multi-bucket aggregation that works on geo_point fields
// and conceptually works very similar to the range aggregation.
// The user can define a point of origin and a set of distance range buckets.
// The aggregation evaluate the distance of each document value from
// the origin point and determines the buckets it belongs to based on
// the ranges (a document belongs to a bucket if the distance between the
// document and the origin falls within the distance range of the bucket).
// See: http://www.elasticsearch.org/guide/en/elasticsearch/reference/master/search-aggregations-bucket-geodistance-aggregation.html
type GeoDistanceAggregation struct {
field string
unit string
distanceType string
point string
ranges []geoDistAggRange
subAggregations map[string]Aggregation
}
type geoDistAggRange struct {
Key string
From interface{}
To interface{}
}
func NewGeoDistanceAggregation() GeoDistanceAggregation {
a := GeoDistanceAggregation{
subAggregations: make(map[string]Aggregation),
ranges: make([]geoDistAggRange, 0),
}
return a
}
func (a GeoDistanceAggregation) Field(field string) GeoDistanceAggregation {
a.field = field
return a
}
func (a GeoDistanceAggregation) Unit(unit string) GeoDistanceAggregation {
a.unit = unit
return a
}
func (a GeoDistanceAggregation) DistanceType(distanceType string) GeoDistanceAggregation {
a.distanceType = distanceType
return a
}
func (a GeoDistanceAggregation) Point(latLon string) GeoDistanceAggregation {
a.point = latLon
return a
}
func (a GeoDistanceAggregation) SubAggregation(name string, subAggregation Aggregation) GeoDistanceAggregation {
a.subAggregations[name] = subAggregation
return a
}
func (a GeoDistanceAggregation) AddRange(from, to interface{}) GeoDistanceAggregation {
a.ranges = append(a.ranges, geoDistAggRange{From: from, To: to})
return a
}
func (a GeoDistanceAggregation) AddRangeWithKey(key string, from, to interface{}) GeoDistanceAggregation {
a.ranges = append(a.ranges, geoDistAggRange{Key: key, From: from, To: to})
return a
}
func (a GeoDistanceAggregation) AddUnboundedTo(from float64) GeoDistanceAggregation {
a.ranges = append(a.ranges, geoDistAggRange{From: from, To: nil})
return a
}
func (a GeoDistanceAggregation) AddUnboundedToWithKey(key string, from float64) GeoDistanceAggregation {
a.ranges = append(a.ranges, geoDistAggRange{Key: key, From: from, To: nil})
return a
}
func (a GeoDistanceAggregation) AddUnboundedFrom(to float64) GeoDistanceAggregation {
a.ranges = append(a.ranges, geoDistAggRange{From: nil, To: to})
return a
}
func (a GeoDistanceAggregation) AddUnboundedFromWithKey(key string, to float64) GeoDistanceAggregation {
a.ranges = append(a.ranges, geoDistAggRange{Key: key, From: nil, To: to})
return a
}
func (a GeoDistanceAggregation) Between(from, to interface{}) GeoDistanceAggregation {
a.ranges = append(a.ranges, geoDistAggRange{From: from, To: to})
return a
}
func (a GeoDistanceAggregation) BetweenWithKey(key string, from, to interface{}) GeoDistanceAggregation {
a.ranges = append(a.ranges, geoDistAggRange{Key: key, From: from, To: to})
return a
}
func (a GeoDistanceAggregation) Source() interface{} {
// Example:
// {
// "aggs" : {
// "rings_around_amsterdam" : {
// "geo_distance" : {
// "field" : "location",
// "origin" : "52.3760, 4.894",
// "ranges" : [
// { "to" : 100 },
// { "from" : 100, "to" : 300 },
// { "from" : 300 }
// ]
// }
// }
// }
// }
//
// This method returns only the { "range" : { ... } } part.
source := make(map[string]interface{})
opts := make(map[string]interface{})
source["geo_distance"] = opts
if a.field != "" {
opts["field"] = a.field
}
if a.unit != "" {
opts["unit"] = a.unit
}
if a.distanceType != "" {
opts["distance_type"] = a.distanceType
}
if a.point != "" {
opts["origin"] = a.point
}
ranges := make([]interface{}, 0)
for _, ent := range a.ranges {
r := make(map[string]interface{})
if ent.Key != "" {
r["key"] = ent.Key
}
if ent.From != nil {
switch from := ent.From.(type) {
case int, int16, int32, int64, float32, float64:
r["from"] = from
case *int, *int16, *int32, *int64, *float32, *float64:
r["from"] = from
case string:
r["from"] = from
}
}
if ent.To != nil {
switch to := ent.To.(type) {
case int, int16, int32, int64, float32, float64:
r["to"] = to
case *int, *int16, *int32, *int64, *float32, *float64:
r["to"] = to
case string:
r["to"] = to
}
}
ranges = append(ranges, r)
}
opts["ranges"] = ranges
// AggregationBuilder (SubAggregations)
if len(a.subAggregations) > 0 {
aggsMap := make(map[string]interface{})
source["aggregations"] = aggsMap
for name, aggregate := range a.subAggregations {
aggsMap[name] = aggregate.Source()
}
}
return source
}
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