129 lines
3.1 KiB
Go
129 lines
3.1 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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"fmt"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/search"
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)
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type matchQuery struct {
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Match string `json:"match"`
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FieldVal string `json:"field,omitempty"`
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Analyzer string `json:"analyzer,omitempty"`
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BoostVal float64 `json:"boost,omitempty"`
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PrefixVal int `json:"prefix_length"`
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FuzzinessVal int `json:"fuzziness"`
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}
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// NewMatchQuery creates a Query for matching text.
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// An Analyzer is chosen based on the field.
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// Input text is analyzed using this analyzer.
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// Token terms resulting from this analysis are
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// used to perform term searches. Result documents
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// must satisfy at least one of these term searches.
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func NewMatchQuery(match string) *matchQuery {
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return &matchQuery{
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Match: match,
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BoostVal: 1.0,
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}
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}
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func (q *matchQuery) Boost() float64 {
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return q.BoostVal
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}
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func (q *matchQuery) 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 *matchQuery) Field() string {
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return q.FieldVal
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}
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func (q *matchQuery) 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 *matchQuery) Fuzziness() int {
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return q.FuzzinessVal
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}
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func (q *matchQuery) 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 *matchQuery) Prefix() int {
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return q.PrefixVal
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}
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func (q *matchQuery) 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 *matchQuery) 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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analyzerName := ""
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if q.Analyzer != "" {
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analyzerName = q.Analyzer
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} else {
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analyzerName = m.analyzerNameForPath(field)
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}
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analyzer := m.analyzerNamed(analyzerName)
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if analyzer == nil {
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return nil, fmt.Errorf("no analyzer named '%s' registered", q.Analyzer)
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}
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tokens := analyzer.Analyze([]byte(q.Match))
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if len(tokens) > 0 {
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tqs := make([]Query, len(tokens))
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if q.FuzzinessVal != 0 {
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for i, token := range tokens {
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query := NewFuzzyQuery(string(token.Term))
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query.SetFuzziness(q.FuzzinessVal)
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query.SetPrefix(q.PrefixVal)
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query.SetField(field)
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query.SetBoost(q.BoostVal)
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tqs[i] = query
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}
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} else {
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for i, token := range tokens {
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tqs[i] = NewTermQuery(string(token.Term)).
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SetField(field).
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SetBoost(q.BoostVal)
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}
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}
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shouldQuery := NewDisjunctionQueryMin(tqs, 1).
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SetBoost(q.BoostVal)
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return shouldQuery.Searcher(i, m, explain)
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}
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noneQuery := NewMatchNoneQuery()
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return noneQuery.Searcher(i, m, explain)
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}
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func (q *matchQuery) Validate() error {
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return nil
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}
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