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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
// StatsAggregation is a multi-value metrics aggregation that computes stats
// over numeric values extracted from the aggregated documents.
// These values can be extracted either from specific numeric fields
// in the documents, or be generated by a provided script.
// See: https://www.elastic.co/guide/en/elasticsearch/reference/6.0/search-aggregations-metrics-stats-aggregation.html
type StatsAggregation struct {
field string
script *Script
format string
subAggregations map[string]Aggregation
meta map[string]interface{}
}
func NewStatsAggregation() *StatsAggregation {
return &StatsAggregation{
subAggregations: make(map[string]Aggregation),
}
}
func (a *StatsAggregation) Field(field string) *StatsAggregation {
a.field = field
return a
}
func (a *StatsAggregation) Script(script *Script) *StatsAggregation {
a.script = script
return a
}
func (a *StatsAggregation) Format(format string) *StatsAggregation {
a.format = format
return a
}
func (a *StatsAggregation) SubAggregation(name string, subAggregation Aggregation) *StatsAggregation {
a.subAggregations[name] = subAggregation
return a
}
// Meta sets the meta data to be included in the aggregation response.
func (a *StatsAggregation) Meta(metaData map[string]interface{}) *StatsAggregation {
a.meta = metaData
return a
}
func (a *StatsAggregation) Source() (interface{}, error) {
// Example:
// {
// "aggs" : {
// "grades_stats" : { "stats" : { "field" : "grade" } }
// }
// }
// This method returns only the { "stats" : { "field" : "grade" } } part.
source := make(map[string]interface{})
opts := make(map[string]interface{})
source["stats"] = opts
// ValuesSourceAggregationBuilder
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
}
if a.format != "" {
opts["format"] = a.format
}
// 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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