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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
// 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: http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-aggregations-metrics-cardinality-aggregation.html
type CardinalityAggregation struct {
field string
script string
scriptFile string
lang string
format string
params map[string]interface{}
subAggregations map[string]Aggregation
precisionThreshold *int64
rehash *bool
}
func NewCardinalityAggregation() CardinalityAggregation {
a := CardinalityAggregation{
params: make(map[string]interface{}),
subAggregations: make(map[string]Aggregation),
}
return a
}
func (a CardinalityAggregation) Field(field string) CardinalityAggregation {
a.field = field
return a
}
func (a CardinalityAggregation) Script(script string) CardinalityAggregation {
a.script = script
return a
}
func (a CardinalityAggregation) ScriptFile(scriptFile string) CardinalityAggregation {
a.scriptFile = scriptFile
return a
}
func (a CardinalityAggregation) Lang(lang string) CardinalityAggregation {
a.lang = lang
return a
}
func (a CardinalityAggregation) Format(format string) CardinalityAggregation {
a.format = format
return a
}
func (a CardinalityAggregation) Param(name string, value interface{}) CardinalityAggregation {
a.params[name] = value
return a
}
func (a CardinalityAggregation) SubAggregation(name string, subAggregation Aggregation) CardinalityAggregation {
a.subAggregations[name] = subAggregation
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{} {
// 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 != "" {
opts["script"] = a.script
}
if a.scriptFile != "" {
opts["script_file"] = a.scriptFile
}
if a.lang != "" {
opts["lang"] = a.lang
}
if a.format != "" {
opts["format"] = a.format
}
if len(a.params) > 0 {
opts["params"] = a.params
}
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 {
aggsMap[name] = aggregate.Source()
}
}
return source
}
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