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query_disjunction.go
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query_disjunction.go
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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 bleve
import (
"encoding/json"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/search"
"github.com/blevesearch/bleve/search/searchers"
)
type disjunctionQuery struct {
Disjuncts []Query `json:"disjuncts"`
BoostVal float64 `json:"boost,omitempty"`
MinVal float64 `json:"min"`
}
// NewDisjunctionQuery creates a new compound Query.
// Result documents satisfy at least one Query.
func NewDisjunctionQuery(disjuncts []Query) *disjunctionQuery {
return &disjunctionQuery{
Disjuncts: disjuncts,
BoostVal: 1.0,
}
}
// NewDisjunctionQueryMin creates a new compound Query.
// Result documents satisfy at least min Queries.
func NewDisjunctionQueryMin(disjuncts []Query, min float64) *disjunctionQuery {
return &disjunctionQuery{
Disjuncts: disjuncts,
BoostVal: 1.0,
MinVal: min,
}
}
func (q *disjunctionQuery) Boost() float64 {
return q.BoostVal
}
func (q *disjunctionQuery) SetBoost(b float64) Query {
q.BoostVal = b
return q
}
func (q *disjunctionQuery) AddQuery(aq Query) Query {
q.Disjuncts = append(q.Disjuncts, aq)
return q
}
func (q *disjunctionQuery) Min() float64 {
return q.MinVal
}
func (q *disjunctionQuery) SetMin(m float64) Query {
q.MinVal = m
return q
}
func (q *disjunctionQuery) Searcher(i index.IndexReader, m *IndexMapping, explain bool) (search.Searcher, error) {
ss := make([]search.Searcher, len(q.Disjuncts))
for in, disjunct := range q.Disjuncts {
var err error
ss[in], err = disjunct.Searcher(i, m, explain)
if err != nil {
return nil, err
}
}
return searchers.NewDisjunctionSearcher(i, ss, q.MinVal, explain)
}
func (q *disjunctionQuery) Validate() error {
if int(q.MinVal) > len(q.Disjuncts) {
return ErrorDisjunctionFewerThanMinClauses
}
return nil
}
func (q *disjunctionQuery) UnmarshalJSON(data []byte) error {
tmp := struct {
Disjuncts []json.RawMessage `json:"disjuncts"`
BoostVal float64 `json:"boost,omitempty"`
MinVal float64 `json:"min"`
}{}
err := json.Unmarshal(data, &tmp)
if err != nil {
return err
}
q.Disjuncts = make([]Query, len(tmp.Disjuncts))
for i, term := range tmp.Disjuncts {
query, err := ParseQuery(term)
if err != nil {
return err
}
q.Disjuncts[i] = query
}
q.BoostVal = tmp.BoostVal
if q.BoostVal == 0 {
q.BoostVal = 1
}
q.MinVal = tmp.MinVal
return nil
}
func (q *disjunctionQuery) Field() string {
return ""
}
func (q *disjunctionQuery) SetField(f string) Query {
return q
}