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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"
"github.com/blevesearch/bleve/search/searcher"
)
type DisjunctionQuery struct {
Disjuncts []Query `json:"disjuncts"`
BoostVal *Boost `json:"boost,omitempty"`
Min float64 `json:"min"`
queryStringMode bool
}
// NewDisjunctionQuery creates a new compound Query.
// Result documents satisfy at least one Query.
func NewDisjunctionQuery(disjuncts []Query) *DisjunctionQuery {
return &DisjunctionQuery{
Disjuncts: disjuncts,
}
}
func (q *DisjunctionQuery) SetBoost(b float64) {
boost := Boost(b)
q.BoostVal = &boost
}
func (q *DisjunctionQuery) Boost() float64 {
return q.BoostVal.Value()
}
func (q *DisjunctionQuery) AddQuery(aq ...Query) {
for _, aaq := range aq {
q.Disjuncts = append(q.Disjuncts, aaq)
}
}
func (q *DisjunctionQuery) SetMin(m float64) {
q.Min = m
}
func (q *DisjunctionQuery) Searcher(i index.IndexReader, m mapping.IndexMapping,
options search.SearcherOptions) (search.Searcher, error) {
ss := make([]search.Searcher, 0, len(q.Disjuncts))
for _, disjunct := range q.Disjuncts {
sr, err := disjunct.Searcher(i, m, options)
if err != nil {
for _, searcher := range ss {
if searcher != nil {
_ = searcher.Close()
}
}
return nil, err
}
if _, ok := sr.(*searcher.MatchNoneSearcher); ok && q.queryStringMode {
// in query string mode, skip match none
continue
}
ss = append(ss, sr)
}
if len(ss) < 1 {
return searcher.NewMatchNoneSearcher(i)
}
return searcher.NewDisjunctionSearcher(i, ss, q.Min, options)
}
func (q *DisjunctionQuery) Validate() error {
if int(q.Min) > len(q.Disjuncts) {
return fmt.Errorf("disjunction query has fewer than the minimum number of clauses to satisfy")
}
for _, q := range q.Disjuncts {
if q, ok := q.(ValidatableQuery); ok {
err := q.Validate()
if err != nil {
return err
}
}
}
return nil
}
func (q *DisjunctionQuery) UnmarshalJSON(data []byte) error {
tmp := struct {
Disjuncts []json.RawMessage `json:"disjuncts"`
Boost *Boost `json:"boost,omitempty"`
Min 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.Boost
q.Min = tmp.Min
return nil
}
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