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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
// The more_like_this_field query is the same as the more_like_this query,
// except it runs against a single field. It provides nicer query DSL
// over the generic more_like_this query, and support typed fields query
// (automatically wraps typed fields with type filter to match only
// on the specific type).
//
// For more details, see:
// http://www.elasticsearch.org/guide/reference/query-dsl/mlt-field-query/
type MoreLikeThisFieldQuery struct {
Query
name string
likeText string
percentTermsToMatch *float32
minTermFreq *int
maxQueryTerms *int
stopWords []string
minDocFreq *int
maxDocFreq *int
minWordLen *int
maxWordLen *int
boostTerms *float32
boost *float32
analyzer string
failOnUnsupportedField *bool
}
// Creates a new mlt_field query.
func NewMoreLikeThisFieldQuery(name, likeText string) MoreLikeThisFieldQuery {
q := MoreLikeThisFieldQuery{
name: name,
likeText: likeText,
stopWords: make([]string, 0),
}
return q
}
func (q MoreLikeThisFieldQuery) Name(name string) MoreLikeThisFieldQuery {
q.name = name
return q
}
func (q MoreLikeThisFieldQuery) StopWord(stopWord string) MoreLikeThisFieldQuery {
q.stopWords = append(q.stopWords, stopWord)
return q
}
func (q MoreLikeThisFieldQuery) StopWords(stopWords ...string) MoreLikeThisFieldQuery {
q.stopWords = append(q.stopWords, stopWords...)
return q
}
func (q MoreLikeThisFieldQuery) LikeText(likeText string) MoreLikeThisFieldQuery {
q.likeText = likeText
return q
}
func (q MoreLikeThisFieldQuery) PercentTermsToMatch(percentTermsToMatch float32) MoreLikeThisFieldQuery {
q.percentTermsToMatch = &percentTermsToMatch
return q
}
func (q MoreLikeThisFieldQuery) MinTermFreq(minTermFreq int) MoreLikeThisFieldQuery {
q.minTermFreq = &minTermFreq
return q
}
func (q MoreLikeThisFieldQuery) MaxQueryTerms(maxQueryTerms int) MoreLikeThisFieldQuery {
q.maxQueryTerms = &maxQueryTerms
return q
}
func (q MoreLikeThisFieldQuery) MinDocFreq(minDocFreq int) MoreLikeThisFieldQuery {
q.minDocFreq = &minDocFreq
return q
}
func (q MoreLikeThisFieldQuery) MaxDocFreq(maxDocFreq int) MoreLikeThisFieldQuery {
q.maxDocFreq = &maxDocFreq
return q
}
func (q MoreLikeThisFieldQuery) MinWordLen(minWordLen int) MoreLikeThisFieldQuery {
q.minWordLen = &minWordLen
return q
}
func (q MoreLikeThisFieldQuery) MaxWordLen(maxWordLen int) MoreLikeThisFieldQuery {
q.maxWordLen = &maxWordLen
return q
}
func (q MoreLikeThisFieldQuery) BoostTerms(boostTerms float32) MoreLikeThisFieldQuery {
q.boostTerms = &boostTerms
return q
}
func (q MoreLikeThisFieldQuery) Analyzer(analyzer string) MoreLikeThisFieldQuery {
q.analyzer = analyzer
return q
}
func (q MoreLikeThisFieldQuery) Boost(boost float32) MoreLikeThisFieldQuery {
q.boost = &boost
return q
}
func (q MoreLikeThisFieldQuery) FailOnUnsupportedField(fail bool) MoreLikeThisFieldQuery {
q.failOnUnsupportedField = &fail
return q
}
// Creates the query source for the mlt query.
func (q MoreLikeThisFieldQuery) Source() interface{} {
// {
// "more_like_this_field" : {
// "name.first" : {
// "like_text" : "text like this one",
// "min_term_freq" : 1,
// "max_query_terms" : 12
// }
// }
// }
source := make(map[string]interface{})
params := make(map[string]interface{})
source["more_like_this_field"] = params
mlt := make(map[string]interface{})
params[q.name] = mlt
mlt["like_text"] = q.likeText
if q.percentTermsToMatch != nil {
mlt["percent_terms_to_match"] = *q.percentTermsToMatch
}
if q.minTermFreq != nil {
mlt["min_term_freq"] = *q.minTermFreq
}
if q.maxQueryTerms != nil {
mlt["max_query_terms"] = *q.maxQueryTerms
}
if len(q.stopWords) > 0 {
mlt["stop_words"] = q.stopWords
}
if q.minDocFreq != nil {
mlt["min_doc_freq"] = *q.minDocFreq
}
if q.maxDocFreq != nil {
mlt["max_doc_freq"] = *q.maxDocFreq
}
if q.minWordLen != nil {
mlt["min_word_len"] = *q.minWordLen
}
if q.maxWordLen != nil {
mlt["max_word_len"] = *q.maxWordLen
}
if q.boostTerms != nil {
mlt["boost_terms"] = *q.boostTerms
}
if q.boost != nil {
mlt["boost"] = *q.boost
}
if q.analyzer != "" {
mlt["analyzer"] = q.analyzer
}
if q.failOnUnsupportedField != nil {
mlt["fail_on_unsupported_field"] = *q.failOnUnsupportedField
}
return source
}
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