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// Copyright 2012-present 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
// GeoCentroidAggregation is a metric aggregation that computes the weighted centroid
// from all coordinate values for a Geo-point datatype field.
// See: https://www.elastic.co/guide/en/elasticsearch/reference/5.6/search-aggregations-metrics-geocentroid-aggregation.html
type GeoCentroidAggregation struct {
field string
script *Script
subAggregations map[string]Aggregation
meta map[string]interface{}
}
func NewGeoCentroidAggregation() *GeoCentroidAggregation {
return &GeoCentroidAggregation{
subAggregations: make(map[string]Aggregation),
}
}
func (a *GeoCentroidAggregation) Field(field string) *GeoCentroidAggregation {
a.field = field
return a
}
func (a *GeoCentroidAggregation) Script(script *Script) *GeoCentroidAggregation {
a.script = script
return a
}
func (a *GeoCentroidAggregation) SubAggregation(name string, subAggregation Aggregation) *GeoCentroidAggregation {
a.subAggregations[name] = subAggregation
return a
}
// Meta sets the meta data to be included in the aggregation response.
func (a *GeoCentroidAggregation) Meta(metaData map[string]interface{}) *GeoCentroidAggregation {
a.meta = metaData
return a
}
func (a *GeoCentroidAggregation) Source() (interface{}, error) {
// Example:
// {
// "query" : {
// "match" : { "business_type" : "shop" }
// },
// "aggs" : {
// "centroid" : {
// "geo_centroid" : {
// "field" : "location"
// }
// }
// }
// }
//
// This method returns only the { "geo_centroid" : { ... } } part.
source := make(map[string]interface{})
opts := make(map[string]interface{})
source["geo_centroid"] = opts
if a.field != "" {
opts["field"] = a.field
}
if a.script != nil {
src, err := a.script.Source()
if err != nil {
return nil, err
}
opts["script"] = src
}
// AggregationBuilder (SubAggregations)
if len(a.subAggregations) > 0 {
aggsMap := make(map[string]interface{})
source["aggregations"] = aggsMap
for name, aggregate := range a.subAggregations {
src, err := aggregate.Source()
if err != nil {
return nil, err
}
aggsMap[name] = src
}
}
// Add Meta data if available
if len(a.meta) > 0 {
source["meta"] = a.meta
}
return source, nil
}
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