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176 lines
4.4 KiB
176 lines
4.4 KiB
// Copyright (c) 2014 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package query
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import (
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"encoding/json"
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"fmt"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/mapping"
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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 *Boost `json:"boost,omitempty"`
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Prefix int `json:"prefix_length"`
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Fuzziness int `json:"fuzziness"`
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Operator MatchQueryOperator `json:"operator,omitempty"`
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}
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type MatchQueryOperator int
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const (
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// Document must satisfy AT LEAST ONE of term searches.
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MatchQueryOperatorOr = 0
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// Document must satisfy ALL of term searches.
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MatchQueryOperatorAnd = 1
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)
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func (o MatchQueryOperator) MarshalJSON() ([]byte, error) {
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switch o {
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case MatchQueryOperatorOr:
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return json.Marshal("or")
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case MatchQueryOperatorAnd:
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return json.Marshal("and")
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default:
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return nil, fmt.Errorf("cannot marshal match operator %d to JSON", o)
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}
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}
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func (o *MatchQueryOperator) UnmarshalJSON(data []byte) error {
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var operatorString string
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err := json.Unmarshal(data, &operatorString)
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if err != nil {
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return err
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}
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switch operatorString {
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case "or":
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*o = MatchQueryOperatorOr
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return nil
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case "and":
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*o = MatchQueryOperatorAnd
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return nil
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default:
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return fmt.Errorf("cannot unmarshal match operator '%v' from JSON", o)
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}
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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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Operator: MatchQueryOperatorOr,
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}
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}
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func (q *MatchQuery) SetBoost(b float64) {
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boost := Boost(b)
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q.BoostVal = &boost
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}
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func (q *MatchQuery) Boost() float64{
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return q.BoostVal.Value()
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}
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func (q *MatchQuery) SetField(f string) {
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q.FieldVal = f
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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) SetFuzziness(f int) {
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q.Fuzziness = f
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}
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func (q *MatchQuery) SetPrefix(p int) {
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q.Prefix = p
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}
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func (q *MatchQuery) SetOperator(operator MatchQueryOperator) {
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q.Operator = operator
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}
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func (q *MatchQuery) Searcher(i index.IndexReader, m mapping.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.DefaultSearchField()
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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.Fuzziness != 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.Fuzziness)
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query.SetPrefix(q.Prefix)
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query.SetField(field)
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query.SetBoost(q.BoostVal.Value())
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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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tq := NewTermQuery(string(token.Term))
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tq.SetField(field)
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tq.SetBoost(q.BoostVal.Value())
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tqs[i] = tq
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}
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}
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switch q.Operator {
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case MatchQueryOperatorOr:
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shouldQuery := NewDisjunctionQuery(tqs)
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shouldQuery.SetMin(1)
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shouldQuery.SetBoost(q.BoostVal.Value())
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return shouldQuery.Searcher(i, m, explain)
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case MatchQueryOperatorAnd:
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mustQuery := NewConjunctionQuery(tqs)
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mustQuery.SetBoost(q.BoostVal.Value())
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return mustQuery.Searcher(i, m, explain)
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default:
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return nil, fmt.Errorf("unhandled operator %d", q.Operator)
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}
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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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