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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
import (
"encoding/json"
"errors"
)
// SuggestField can be used by the caller to specify a suggest field
// at index time. For a detailed example, see e.g.
// https://www.elastic.co/blog/you-complete-me.
type SuggestField struct {
inputs []string
weight int
contextQueries []SuggesterContextQuery
}
func NewSuggestField(input ...string) *SuggestField {
return &SuggestField{
inputs: input,
weight: -1,
}
}
func (f *SuggestField) Input(input ...string) *SuggestField {
if f.inputs == nil {
f.inputs = make([]string, 0)
}
f.inputs = append(f.inputs, input...)
return f
}
func (f *SuggestField) Weight(weight int) *SuggestField {
f.weight = weight
return f
}
func (f *SuggestField) ContextQuery(queries ...SuggesterContextQuery) *SuggestField {
f.contextQueries = append(f.contextQueries, queries...)
return f
}
// MarshalJSON encodes SuggestField into JSON.
func (f *SuggestField) MarshalJSON() ([]byte, error) {
source := make(map[string]interface{})
if f.inputs != nil {
switch len(f.inputs) {
case 1:
source["input"] = f.inputs[0]
default:
source["input"] = f.inputs
}
}
if f.weight >= 0 {
source["weight"] = f.weight
}
switch len(f.contextQueries) {
case 0:
case 1:
src, err := f.contextQueries[0].Source()
if err != nil {
return nil, err
}
source["contexts"] = src
default:
ctxq := make(map[string]interface{})
for _, query := range f.contextQueries {
src, err := query.Source()
if err != nil {
return nil, err
}
m, ok := src.(map[string]interface{})
if !ok {
return nil, errors.New("SuggesterContextQuery must be of type map[string]interface{}")
}
for k, v := range m {
ctxq[k] = v
}
}
source["contexts"] = ctxq
}
return json.Marshal(source)
}
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