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// 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 query
import (
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/mapping"
"github.com/blevesearch/bleve/search"
"github.com/blevesearch/bleve/search/searcher"
)
type FuzzyQuery struct {
Term string `json:"term"`
Prefix int `json:"prefix_length"`
Fuzziness int `json:"fuzziness"`
FieldVal string `json:"field,omitempty"`
BoostVal *Boost `json:"boost,omitempty"`
}
// NewFuzzyQuery creates a new Query which finds
// documents containing terms within a specific
// fuzziness of the specified term.
// The default fuzziness is 1.
//
// The current implementation uses Levenshtein edit
// distance as the fuzziness metric.
func NewFuzzyQuery(term string) *FuzzyQuery {
return &FuzzyQuery{
Term: term,
Fuzziness: 1,
}
}
func (q *FuzzyQuery) SetBoost(b float64) {
boost := Boost(b)
q.BoostVal = &boost
}
func (q *FuzzyQuery) Boost() float64 {
return q.BoostVal.Value()
}
func (q *FuzzyQuery) SetField(f string) {
q.FieldVal = f
}
func (q *FuzzyQuery) Field() string {
return q.FieldVal
}
func (q *FuzzyQuery) SetFuzziness(f int) {
q.Fuzziness = f
}
func (q *FuzzyQuery) SetPrefix(p int) {
q.Prefix = p
}
func (q *FuzzyQuery) Searcher(i index.IndexReader, m mapping.IndexMapping, options search.SearcherOptions) (search.Searcher, error) {
field := q.FieldVal
if q.FieldVal == "" {
field = m.DefaultSearchField()
}
return searcher.NewFuzzySearcher(i, q.Term, q.Prefix, q.Fuzziness, field, q.BoostVal.Value(), options)
}
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