103 lines
2.8 KiB
Go
103 lines
2.8 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package query
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import (
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"encoding/json"
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"fmt"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/mapping"
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"github.com/blevesearch/bleve/search"
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"github.com/blevesearch/bleve/search/searchers"
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)
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type PhraseQuery struct {
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Terms []string `json:"terms"`
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FieldVal string `json:"field,omitempty"`
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BoostVal float64 `json:"boost,omitempty"`
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termQueries []Query
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}
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// NewPhraseQuery creates a new Query for finding
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// exact term phrases in the index.
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// The provided terms must exist in the correct
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// order, at the correct index offsets, in the
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// specified field. Queried field must have been indexed with
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// IncludeTermVectors set to true.
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func NewPhraseQuery(terms []string, field string) *PhraseQuery {
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termQueries := make([]Query, 0)
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for _, term := range terms {
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if term != "" {
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termQueries = append(termQueries, NewTermQuery(term).SetField(field))
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}
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}
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return &PhraseQuery{
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Terms: terms,
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FieldVal: field,
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BoostVal: 1.0,
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termQueries: termQueries,
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}
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}
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func (q *PhraseQuery) Boost() float64 {
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return q.BoostVal
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}
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func (q *PhraseQuery) SetBoost(b float64) Query {
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q.BoostVal = b
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return q
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}
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func (q *PhraseQuery) Searcher(i index.IndexReader, m mapping.IndexMapping, explain bool) (search.Searcher, error) {
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conjunctionQuery := NewConjunctionQuery(q.termQueries)
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conjunctionSearcher, err := conjunctionQuery.Searcher(i, m, explain)
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if err != nil {
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return nil, err
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}
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return searchers.NewPhraseSearcher(i, conjunctionSearcher.(*searchers.ConjunctionSearcher), q.Terms)
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}
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func (q *PhraseQuery) Validate() error {
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if len(q.termQueries) < 1 {
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return fmt.Errorf("phrase query must contain at least one term")
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}
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return nil
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}
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func (q *PhraseQuery) UnmarshalJSON(data []byte) error {
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type _phraseQuery PhraseQuery
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tmp := _phraseQuery{}
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err := json.Unmarshal(data, &tmp)
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if err != nil {
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return err
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}
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q.Terms = tmp.Terms
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q.FieldVal = tmp.FieldVal
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q.BoostVal = tmp.BoostVal
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if q.BoostVal == 0 {
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q.BoostVal = 1
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}
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q.termQueries = make([]Query, len(q.Terms))
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for i, term := range q.Terms {
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q.termQueries[i] = &TermQuery{Term: term, FieldVal: q.FieldVal, BoostVal: q.BoostVal}
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}
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return nil
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}
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func (q *PhraseQuery) Field() string {
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return ""
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}
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func (q *PhraseQuery) SetField(f string) Query {
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return q
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}
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