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157 lines
4.1 KiB
Go
157 lines
4.1 KiB
Go
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// Copyright 2012-present 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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// RareTermsAggregation is a multi-bucket value source based aggregation
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// which finds "rare" terms — terms that are at the long-tail of the distribution
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// and are not frequent. Conceptually, this is like a terms aggregation that
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// is sorted by _count ascending.
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//
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// See https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-rare-terms-aggregation.html
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// for details.
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type RareTermsAggregation struct {
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field string
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subAggregations map[string]Aggregation
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meta map[string]interface{}
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includeExclude *TermsAggregationIncludeExclude
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maxDocCount *int
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precision *float64
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missing interface{}
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}
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func NewRareTermsAggregation() *RareTermsAggregation {
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return &RareTermsAggregation{
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subAggregations: make(map[string]Aggregation),
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}
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}
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func (a *RareTermsAggregation) Field(field string) *RareTermsAggregation {
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a.field = field
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return a
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}
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func (a *RareTermsAggregation) SubAggregation(name string, subAggregation Aggregation) *RareTermsAggregation {
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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 *RareTermsAggregation) Meta(metaData map[string]interface{}) *RareTermsAggregation {
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a.meta = metaData
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return a
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}
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func (a *RareTermsAggregation) MaxDocCount(maxDocCount int) *RareTermsAggregation {
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a.maxDocCount = &maxDocCount
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return a
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}
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func (a *RareTermsAggregation) Precision(precision float64) *RareTermsAggregation {
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a.precision = &precision
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return a
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}
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func (a *RareTermsAggregation) Missing(missing interface{}) *RareTermsAggregation {
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a.missing = missing
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return a
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}
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func (a *RareTermsAggregation) Include(regexp string) *RareTermsAggregation {
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if a.includeExclude == nil {
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a.includeExclude = &TermsAggregationIncludeExclude{}
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}
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a.includeExclude.Include = regexp
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return a
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}
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func (a *RareTermsAggregation) IncludeValues(values ...interface{}) *RareTermsAggregation {
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if a.includeExclude == nil {
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a.includeExclude = &TermsAggregationIncludeExclude{}
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}
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a.includeExclude.IncludeValues = append(a.includeExclude.IncludeValues, values...)
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return a
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}
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func (a *RareTermsAggregation) Exclude(regexp string) *RareTermsAggregation {
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if a.includeExclude == nil {
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a.includeExclude = &TermsAggregationIncludeExclude{}
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}
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a.includeExclude.Exclude = regexp
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return a
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}
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func (a *RareTermsAggregation) ExcludeValues(values ...interface{}) *RareTermsAggregation {
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if a.includeExclude == nil {
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a.includeExclude = &TermsAggregationIncludeExclude{}
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}
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a.includeExclude.ExcludeValues = append(a.includeExclude.ExcludeValues, values...)
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return a
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}
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func (a *RareTermsAggregation) IncludeExclude(includeExclude *TermsAggregationIncludeExclude) *RareTermsAggregation {
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a.includeExclude = includeExclude
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return a
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}
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func (a *RareTermsAggregation) Source() (interface{}, error) {
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// Example:
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// {
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// "aggregations" : {
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// "genres" : {
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// "rare_terms" : { "field" : "genre" }
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// }
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// }
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// }
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//
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// This method returns only the
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// "rare_terms" : { "field" : "genre" }
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// part.
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source := make(map[string]interface{})
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opts := make(map[string]interface{})
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source["rare_terms"] = opts
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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.maxDocCount != nil {
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opts["max_doc_count"] = *a.maxDocCount
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}
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if a.precision != nil {
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opts["precision"] = *a.precision
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}
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if a.missing != nil {
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opts["missing"] = a.missing
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}
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// Include/Exclude
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if ie := a.includeExclude; ie != nil {
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if err := ie.MergeInto(opts); err != nil {
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return nil, err
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}
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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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