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120 lines
3.1 KiB
120 lines
3.1 KiB
// Copyright 2012-2015 Oliver Eilhard. All rights reserved.
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// Use of this source code is governed by a MIT-license.
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// See http://olivere.mit-license.org/license.txt for details.
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package elastic
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// CardinalityAggregation is a single-value metrics aggregation that
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// calculates an approximate count of distinct values.
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// Values can be extracted either from specific fields in the document
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// or generated by a script.
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// See: http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-aggregations-metrics-cardinality-aggregation.html
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type CardinalityAggregation struct {
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field string
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script *Script
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format string
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subAggregations map[string]Aggregation
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meta map[string]interface{}
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precisionThreshold *int64
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rehash *bool
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}
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func NewCardinalityAggregation() *CardinalityAggregation {
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return &CardinalityAggregation{
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subAggregations: make(map[string]Aggregation),
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}
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}
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func (a *CardinalityAggregation) Field(field string) *CardinalityAggregation {
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a.field = field
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return a
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}
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func (a *CardinalityAggregation) Script(script *Script) *CardinalityAggregation {
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a.script = script
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return a
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}
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func (a *CardinalityAggregation) Format(format string) *CardinalityAggregation {
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a.format = format
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return a
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}
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func (a *CardinalityAggregation) SubAggregation(name string, subAggregation Aggregation) *CardinalityAggregation {
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a.subAggregations[name] = subAggregation
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return a
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}
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// Meta sets the meta data to be included in the aggregation response.
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func (a *CardinalityAggregation) Meta(metaData map[string]interface{}) *CardinalityAggregation {
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a.meta = metaData
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return a
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}
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func (a *CardinalityAggregation) PrecisionThreshold(threshold int64) *CardinalityAggregation {
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a.precisionThreshold = &threshold
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return a
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}
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func (a *CardinalityAggregation) Rehash(rehash bool) *CardinalityAggregation {
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a.rehash = &rehash
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return a
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}
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func (a *CardinalityAggregation) Source() (interface{}, error) {
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// Example:
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// {
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// "aggs" : {
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// "author_count" : {
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// "cardinality" : { "field" : "author" }
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// }
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// }
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// }
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// This method returns only the "cardinality" : { "field" : "author" } part.
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source := make(map[string]interface{})
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opts := make(map[string]interface{})
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source["cardinality"] = opts
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// ValuesSourceAggregationBuilder
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if a.field != "" {
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opts["field"] = a.field
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}
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if a.script != nil {
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src, err := a.script.Source()
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if err != nil {
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return nil, err
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}
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opts["script"] = src
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}
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if a.format != "" {
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opts["format"] = a.format
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}
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if a.precisionThreshold != nil {
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opts["precision_threshold"] = *a.precisionThreshold
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}
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if a.rehash != nil {
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opts["rehash"] = *a.rehash
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}
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// AggregationBuilder (SubAggregations)
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if len(a.subAggregations) > 0 {
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aggsMap := make(map[string]interface{})
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source["aggregations"] = aggsMap
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for name, aggregate := range a.subAggregations {
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src, err := aggregate.Source()
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if err != nil {
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return nil, err
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}
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aggsMap[name] = src
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}
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}
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// Add Meta data if available
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if len(a.meta) > 0 {
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source["meta"] = a.meta
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}
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return source, nil
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}
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