89 lines
2.2 KiB
Go
89 lines
2.2 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 bleve
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import (
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"github.com/blevesearch/bleve/index"
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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 fuzzyQuery struct {
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Term string `json:"term"`
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PrefixVal int `json:"prefix_length"`
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FuzzinessVal int `json:"fuzziness"`
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FieldVal string `json:"field,omitempty"`
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BoostVal float64 `json:"boost,omitempty"`
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}
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// NewFuzzyQuery creates a new Query which finds
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// documents containing terms within a specific
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// fuzziness of the specified term.
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// The default fuzziness is 2.
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//
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// The current implementation uses Leveshtein edit
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// distance as the fuzziness metric.
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func NewFuzzyQuery(term string) *fuzzyQuery {
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return &fuzzyQuery{
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Term: term,
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PrefixVal: 0,
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FuzzinessVal: 2,
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BoostVal: 1.0,
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}
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}
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func (q *fuzzyQuery) Boost() float64 {
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return q.BoostVal
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}
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func (q *fuzzyQuery) 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 *fuzzyQuery) Field() string {
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return q.FieldVal
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}
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func (q *fuzzyQuery) SetField(f string) Query {
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q.FieldVal = f
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return q
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}
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func (q *fuzzyQuery) Fuzziness() int {
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return q.FuzzinessVal
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}
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func (q *fuzzyQuery) SetFuzziness(f int) Query {
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q.FuzzinessVal = f
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return q
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}
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func (q *fuzzyQuery) Prefix() int {
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return q.PrefixVal
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}
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func (q *fuzzyQuery) SetPrefix(p int) Query {
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q.PrefixVal = p
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return q
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}
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func (q *fuzzyQuery) Searcher(i index.IndexReader, m *IndexMapping, explain bool) (search.Searcher, error) {
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field := q.FieldVal
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if q.FieldVal == "" {
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field = m.DefaultField
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}
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return searchers.NewFuzzySearcher(i, q.Term, q.PrefixVal, q.FuzzinessVal, field, q.BoostVal, explain)
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}
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func (q *fuzzyQuery) Validate() error {
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return nil
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}
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