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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 (
"encoding/json"
"fmt"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/mapping"
"github.com/blevesearch/bleve/search"
)
type MatchQuery struct {
Match string `json:"match"`
FieldVal string `json:"field,omitempty"`
Analyzer string `json:"analyzer,omitempty"`
BoostVal *Boost `json:"boost,omitempty"`
Prefix int `json:"prefix_length"`
Fuzziness int `json:"fuzziness"`
Operator MatchQueryOperator `json:"operator,omitempty"`
}
type MatchQueryOperator int
const (
// Document must satisfy AT LEAST ONE of term searches.
MatchQueryOperatorOr = 0
// Document must satisfy ALL of term searches.
MatchQueryOperatorAnd = 1
)
func (o MatchQueryOperator) MarshalJSON() ([]byte, error) {
switch o {
case MatchQueryOperatorOr:
return json.Marshal("or")
case MatchQueryOperatorAnd:
return json.Marshal("and")
default:
return nil, fmt.Errorf("cannot marshal match operator %d to JSON", o)
}
}
func (o *MatchQueryOperator) UnmarshalJSON(data []byte) error {
var operatorString string
err := json.Unmarshal(data, &operatorString)
if err != nil {
return err
}
switch operatorString {
case "or":
*o = MatchQueryOperatorOr
return nil
case "and":
*o = MatchQueryOperatorAnd
return nil
default:
return fmt.Errorf("cannot unmarshal match operator '%v' from JSON", o)
}
}
// NewMatchQuery creates a Query for matching text.
// An Analyzer is chosen based on the field.
// Input text is analyzed using this analyzer.
// Token terms resulting from this analysis are
// used to perform term searches. Result documents
// must satisfy at least one of these term searches.
func NewMatchQuery(match string) *MatchQuery {
return &MatchQuery{
Match: match,
Operator: MatchQueryOperatorOr,
}
}
func (q *MatchQuery) SetBoost(b float64) {
boost := Boost(b)
q.BoostVal = &boost
}
func (q *MatchQuery) Boost() float64 {
return q.BoostVal.Value()
}
func (q *MatchQuery) SetField(f string) {
q.FieldVal = f
}
func (q *MatchQuery) Field() string {
return q.FieldVal
}
func (q *MatchQuery) SetFuzziness(f int) {
q.Fuzziness = f
}
func (q *MatchQuery) SetPrefix(p int) {
q.Prefix = p
}
func (q *MatchQuery) SetOperator(operator MatchQueryOperator) {
q.Operator = operator
}
func (q *MatchQuery) Searcher(i index.IndexReader, m mapping.IndexMapping, options search.SearcherOptions) (search.Searcher, error) {
field := q.FieldVal
if q.FieldVal == "" {
field = m.DefaultSearchField()
}
analyzerName := ""
if q.Analyzer != "" {
analyzerName = q.Analyzer
} else {
analyzerName = m.AnalyzerNameForPath(field)
}
analyzer := m.AnalyzerNamed(analyzerName)
if analyzer == nil {
return nil, fmt.Errorf("no analyzer named '%s' registered", q.Analyzer)
}
tokens := analyzer.Analyze([]byte(q.Match))
if len(tokens) > 0 {
tqs := make([]Query, len(tokens))
if q.Fuzziness != 0 {
for i, token := range tokens {
query := NewFuzzyQuery(string(token.Term))
query.SetFuzziness(q.Fuzziness)
query.SetPrefix(q.Prefix)
query.SetField(field)
query.SetBoost(q.BoostVal.Value())
tqs[i] = query
}
} else {
for i, token := range tokens {
tq := NewTermQuery(string(token.Term))
tq.SetField(field)
tq.SetBoost(q.BoostVal.Value())
tqs[i] = tq
}
}
switch q.Operator {
case MatchQueryOperatorOr:
shouldQuery := NewDisjunctionQuery(tqs)
shouldQuery.SetMin(1)
shouldQuery.SetBoost(q.BoostVal.Value())
return shouldQuery.Searcher(i, m, options)
case MatchQueryOperatorAnd:
mustQuery := NewConjunctionQuery(tqs)
mustQuery.SetBoost(q.BoostVal.Value())
return mustQuery.Searcher(i, m, options)
default:
return nil, fmt.Errorf("unhandled operator %d", q.Operator)
}
}
noneQuery := NewMatchNoneQuery()
return noneQuery.Searcher(i, m, options)
}
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