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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 function_score allows you to modify the score of documents that
// are retrieved by a query. This can be useful if, for example,
// a score function is computationally expensive and it is sufficient
// to compute the score on a filtered set of documents.
// For more details, see
// http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-function-score-query.html
type FunctionScoreQuery struct {
query Query
filter Filter
boost *float32
maxBoost *float32
scoreMode string
boostMode string
filters []Filter
scoreFuncs []ScoreFunction
minScore *float32
weight *float64
}
// NewFunctionScoreQuery creates a new function score query.
func NewFunctionScoreQuery() FunctionScoreQuery {
return FunctionScoreQuery{
filters: make([]Filter, 0),
scoreFuncs: make([]ScoreFunction, 0),
}
}
func (q FunctionScoreQuery) Query(query Query) FunctionScoreQuery {
q.query = query
q.filter = nil
return q
}
func (q FunctionScoreQuery) Filter(filter Filter) FunctionScoreQuery {
q.query = nil
q.filter = filter
return q
}
func (q FunctionScoreQuery) Add(filter Filter, scoreFunc ScoreFunction) FunctionScoreQuery {
q.filters = append(q.filters, filter)
q.scoreFuncs = append(q.scoreFuncs, scoreFunc)
return q
}
func (q FunctionScoreQuery) AddScoreFunc(scoreFunc ScoreFunction) FunctionScoreQuery {
q.filters = append(q.filters, nil)
q.scoreFuncs = append(q.scoreFuncs, scoreFunc)
return q
}
func (q FunctionScoreQuery) ScoreMode(scoreMode string) FunctionScoreQuery {
q.scoreMode = scoreMode
return q
}
func (q FunctionScoreQuery) BoostMode(boostMode string) FunctionScoreQuery {
q.boostMode = boostMode
return q
}
func (q FunctionScoreQuery) MaxBoost(maxBoost float32) FunctionScoreQuery {
q.maxBoost = &maxBoost
return q
}
func (q FunctionScoreQuery) Boost(boost float32) FunctionScoreQuery {
q.boost = &boost
return q
}
func (q FunctionScoreQuery) MinScore(minScore float32) FunctionScoreQuery {
q.minScore = &minScore
return q
}
// Source returns JSON for the function score query.
func (q FunctionScoreQuery) Source() interface{} {
source := make(map[string]interface{})
query := make(map[string]interface{})
source["function_score"] = query
if q.query != nil {
query["query"] = q.query.Source()
} else if q.filter != nil {
query["filter"] = q.filter.Source()
}
if len(q.filters) == 1 && q.filters[0] == nil {
// Weight needs to be serialized on this level.
if weight := q.scoreFuncs[0].GetWeight(); weight != nil {
query["weight"] = weight
}
// Serialize the score function
query[q.scoreFuncs[0].Name()] = q.scoreFuncs[0].Source()
} else {
funcs := make([]interface{}, len(q.filters))
for i, filter := range q.filters {
hsh := make(map[string]interface{})
if filter != nil {
hsh["filter"] = filter.Source()
}
// Weight needs to be serialized on this level.
if weight := q.scoreFuncs[i].GetWeight(); weight != nil {
hsh["weight"] = weight
}
// Serialize the score function
hsh[q.scoreFuncs[i].Name()] = q.scoreFuncs[i].Source()
funcs[i] = hsh
}
query["functions"] = funcs
}
if q.scoreMode != "" {
query["score_mode"] = q.scoreMode
}
if q.boostMode != "" {
query["boost_mode"] = q.boostMode
}
if q.maxBoost != nil {
query["max_boost"] = *q.maxBoost
}
if q.boost != nil {
query["boost"] = *q.boost
}
if q.minScore != nil {
query["min_score"] = *q.minScore
}
return source
}
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