forked from gitea/gitea
125 lines
3.1 KiB
Go
125 lines
3.1 KiB
Go
// 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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import "errors"
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// SuggesterContextQuery is used to define context information within
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// a suggestion request.
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type SuggesterContextQuery interface {
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Source() (interface{}, error)
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}
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// ContextSuggester is a fast suggester for e.g. type-ahead completion that supports filtering and boosting based on contexts.
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// See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/suggester-context.html
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// for more details.
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type ContextSuggester struct {
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Suggester
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name string
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prefix string
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field string
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size *int
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contextQueries []SuggesterContextQuery
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}
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// Creates a new context suggester.
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func NewContextSuggester(name string) *ContextSuggester {
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return &ContextSuggester{
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name: name,
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contextQueries: make([]SuggesterContextQuery, 0),
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}
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}
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func (q *ContextSuggester) Name() string {
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return q.name
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}
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func (q *ContextSuggester) Prefix(prefix string) *ContextSuggester {
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q.prefix = prefix
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return q
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}
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func (q *ContextSuggester) Field(field string) *ContextSuggester {
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q.field = field
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return q
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}
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func (q *ContextSuggester) Size(size int) *ContextSuggester {
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q.size = &size
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return q
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}
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func (q *ContextSuggester) ContextQuery(query SuggesterContextQuery) *ContextSuggester {
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q.contextQueries = append(q.contextQueries, query)
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return q
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}
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func (q *ContextSuggester) ContextQueries(queries ...SuggesterContextQuery) *ContextSuggester {
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q.contextQueries = append(q.contextQueries, queries...)
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return q
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}
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// contextSuggesterRequest is necessary because the order in which
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// the JSON elements are routed to Elasticsearch is relevant.
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// We got into trouble when using plain maps because the text element
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// needs to go before the completion element.
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type contextSuggesterRequest struct {
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Prefix string `json:"prefix"`
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Completion interface{} `json:"completion"`
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}
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// Creates the source for the context suggester.
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func (q *ContextSuggester) Source(includeName bool) (interface{}, error) {
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cs := &contextSuggesterRequest{}
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if q.prefix != "" {
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cs.Prefix = q.prefix
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}
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suggester := make(map[string]interface{})
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cs.Completion = suggester
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if q.field != "" {
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suggester["field"] = q.field
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}
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if q.size != nil {
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suggester["size"] = *q.size
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}
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switch len(q.contextQueries) {
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case 0:
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case 1:
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src, err := q.contextQueries[0].Source()
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if err != nil {
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return nil, err
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}
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suggester["contexts"] = src
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default:
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ctxq := make(map[string]interface{})
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for _, query := range q.contextQueries {
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src, err := query.Source()
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if err != nil {
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return nil, err
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}
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// Merge the dictionary into ctxq
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m, ok := src.(map[string]interface{})
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if !ok {
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return nil, errors.New("elastic: context query is not a map")
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}
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for k, v := range m {
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ctxq[k] = v
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}
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}
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suggester["contexts"] = ctxq
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}
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if !includeName {
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return cs, nil
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}
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source := make(map[string]interface{})
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source[q.name] = cs
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return source, nil
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}
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