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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
// CardinalityAggregation is a single-value metrics aggregation that
// calculates an approximate count of distinct values.
// Values can be extracted either from specific fields in the document
// or generated by a script.
// See: https://www.elastic.co/guide/en/elasticsearch/reference/5.2/search-aggregations-metrics-cardinality-aggregation.html
type CardinalityAggregation struct {
field string
script *Script
format string
subAggregations map[string]Aggregation
meta map[string]interface{}
precisionThreshold *int64
rehash *bool
}
func NewCardinalityAggregation() *CardinalityAggregation {
return &CardinalityAggregation{
subAggregations: make(map[string]Aggregation),
}
}
func (a *CardinalityAggregation) Field(field string) *CardinalityAggregation {
a.field = field
return a
}
func (a *CardinalityAggregation) Script(script *Script) *CardinalityAggregation {
a.script = script
return a
}
func (a *CardinalityAggregation) Format(format string) *CardinalityAggregation {
a.format = format
return a
}
func (a *CardinalityAggregation) SubAggregation(name string, subAggregation Aggregation) *CardinalityAggregation {
a.subAggregations[name] = subAggregation
return a
}
// Meta sets the meta data to be included in the aggregation response.
func (a *CardinalityAggregation) Meta(metaData map[string]interface{}) *CardinalityAggregation {
a.meta = metaData
return a
}
func (a *CardinalityAggregation) PrecisionThreshold(threshold int64) *CardinalityAggregation {
a.precisionThreshold = &threshold
return a
}
func (a *CardinalityAggregation) Rehash(rehash bool) *CardinalityAggregation {
a.rehash = &rehash
return a
}
func (a *CardinalityAggregation) Source() (interface{}, error) {
// Example:
// {
// "aggs" : {
// "author_count" : {
// "cardinality" : { "field" : "author" }
// }
// }
// }
// This method returns only the "cardinality" : { "field" : "author" } part.
source := make(map[string]interface{})
opts := make(map[string]interface{})
source["cardinality"] = 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
}
if a.precisionThreshold != nil {
opts["precision_threshold"] = *a.precisionThreshold
}
if a.rehash != nil {
opts["rehash"] = *a.rehash
}
// 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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