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