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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
// CommonTermsQuery is a modern alternative to stopwords
// which improves the precision and recall of search results
// (by taking stopwords into account), without sacrificing performance.
// For more details, see:
// https://www.elastic.co/guide/en/elasticsearch/reference/6.0/query-dsl-common-terms-query.html
type CommonTermsQuery struct {
Query
name string
text interface{}
cutoffFreq *float64
highFreq *float64
highFreqOp string
highFreqMinimumShouldMatch string
lowFreq *float64
lowFreqOp string
lowFreqMinimumShouldMatch string
analyzer string
boost *float64
queryName string
}
// NewCommonTermsQuery creates and initializes a new common terms query.
func NewCommonTermsQuery(name string, text interface{}) *CommonTermsQuery {
return &CommonTermsQuery{name: name, text: text}
}
func (q *CommonTermsQuery) CutoffFrequency(f float64) *CommonTermsQuery {
q.cutoffFreq = &f
return q
}
func (q *CommonTermsQuery) HighFreq(f float64) *CommonTermsQuery {
q.highFreq = &f
return q
}
func (q *CommonTermsQuery) HighFreqOperator(op string) *CommonTermsQuery {
q.highFreqOp = op
return q
}
func (q *CommonTermsQuery) HighFreqMinimumShouldMatch(minShouldMatch string) *CommonTermsQuery {
q.highFreqMinimumShouldMatch = minShouldMatch
return q
}
func (q *CommonTermsQuery) LowFreq(f float64) *CommonTermsQuery {
q.lowFreq = &f
return q
}
func (q *CommonTermsQuery) LowFreqOperator(op string) *CommonTermsQuery {
q.lowFreqOp = op
return q
}
func (q *CommonTermsQuery) LowFreqMinimumShouldMatch(minShouldMatch string) *CommonTermsQuery {
q.lowFreqMinimumShouldMatch = minShouldMatch
return q
}
func (q *CommonTermsQuery) Analyzer(analyzer string) *CommonTermsQuery {
q.analyzer = analyzer
return q
}
func (q *CommonTermsQuery) Boost(boost float64) *CommonTermsQuery {
q.boost = &boost
return q
}
func (q *CommonTermsQuery) QueryName(queryName string) *CommonTermsQuery {
q.queryName = queryName
return q
}
// Creates the query source for the common query.
func (q *CommonTermsQuery) Source() (interface{}, error) {
// {
// "common": {
// "body": {
// "query": "this is bonsai cool",
// "cutoff_frequency": 0.001
// }
// }
// }
source := make(map[string]interface{})
body := make(map[string]interface{})
query := make(map[string]interface{})
source["common"] = body
body[q.name] = query
query["query"] = q.text
if q.cutoffFreq != nil {
query["cutoff_frequency"] = *q.cutoffFreq
}
if q.highFreq != nil {
query["high_freq"] = *q.highFreq
}
if q.highFreqOp != "" {
query["high_freq_operator"] = q.highFreqOp
}
if q.lowFreq != nil {
query["low_freq"] = *q.lowFreq
}
if q.lowFreqOp != "" {
query["low_freq_operator"] = q.lowFreqOp
}
if q.lowFreqMinimumShouldMatch != "" || q.highFreqMinimumShouldMatch != "" {
mm := make(map[string]interface{})
if q.lowFreqMinimumShouldMatch != "" {
mm["low_freq"] = q.lowFreqMinimumShouldMatch
}
if q.highFreqMinimumShouldMatch != "" {
mm["high_freq"] = q.highFreqMinimumShouldMatch
}
query["minimum_should_match"] = mm
}
if q.analyzer != "" {
query["analyzer"] = q.analyzer
}
if q.boost != nil {
query["boost"] = *q.boost
}
if q.queryName != "" {
query["_name"] = q.queryName
}
return source, nil
}
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