a380cfd8e0
* update bleve to master b17287a86f6cac923a5d886e10618df994eeb54b6724eac2e3b8dde89cfbe3a2 * remove unused pkg from dep file * change bleve from master to recent revision
130 lines
3.3 KiB
Go
130 lines
3.3 KiB
Go
// 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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"github.com/blevesearch/bleve/search/searcher"
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)
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type DisjunctionQuery struct {
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Disjuncts []Query `json:"disjuncts"`
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BoostVal *Boost `json:"boost,omitempty"`
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Min float64 `json:"min"`
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queryStringMode bool
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}
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// NewDisjunctionQuery creates a new compound Query.
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// Result documents satisfy at least one Query.
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func NewDisjunctionQuery(disjuncts []Query) *DisjunctionQuery {
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return &DisjunctionQuery{
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Disjuncts: disjuncts,
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}
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}
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func (q *DisjunctionQuery) 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 *DisjunctionQuery) Boost() float64 {
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return q.BoostVal.Value()
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}
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func (q *DisjunctionQuery) AddQuery(aq ...Query) {
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for _, aaq := range aq {
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q.Disjuncts = append(q.Disjuncts, aaq)
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}
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}
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func (q *DisjunctionQuery) SetMin(m float64) {
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q.Min = m
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}
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func (q *DisjunctionQuery) Searcher(i index.IndexReader, m mapping.IndexMapping,
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options search.SearcherOptions) (search.Searcher, error) {
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ss := make([]search.Searcher, 0, len(q.Disjuncts))
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for _, disjunct := range q.Disjuncts {
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sr, err := disjunct.Searcher(i, m, options)
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if err != nil {
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for _, searcher := range ss {
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if searcher != nil {
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_ = searcher.Close()
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}
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}
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return nil, err
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}
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if _, ok := sr.(*searcher.MatchNoneSearcher); ok && q.queryStringMode {
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// in query string mode, skip match none
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continue
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}
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ss = append(ss, sr)
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}
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if len(ss) < 1 {
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return searcher.NewMatchNoneSearcher(i)
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} else if len(ss) == 1 && int(q.Min) == ss[0].Min() {
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// apply optimization only if both conditions below are satisfied:
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// - disjunction searcher has only 1 child searcher
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// - parent searcher's min setting is equal to child searcher's min
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return ss[0], nil
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}
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return searcher.NewDisjunctionSearcher(i, ss, q.Min, options)
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}
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func (q *DisjunctionQuery) Validate() error {
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if int(q.Min) > len(q.Disjuncts) {
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return fmt.Errorf("disjunction query has fewer than the minimum number of clauses to satisfy")
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}
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for _, q := range q.Disjuncts {
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if q, ok := q.(ValidatableQuery); ok {
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err := q.Validate()
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if err != nil {
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return err
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}
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}
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}
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return nil
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}
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func (q *DisjunctionQuery) UnmarshalJSON(data []byte) error {
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tmp := struct {
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Disjuncts []json.RawMessage `json:"disjuncts"`
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Boost *Boost `json:"boost,omitempty"`
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Min float64 `json:"min"`
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}{}
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err := json.Unmarshal(data, &tmp)
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if err != nil {
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return err
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}
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q.Disjuncts = make([]Query, len(tmp.Disjuncts))
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for i, term := range tmp.Disjuncts {
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query, err := ParseQuery(term)
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if err != nil {
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return err
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}
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q.Disjuncts[i] = query
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}
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q.BoostVal = tmp.Boost
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q.Min = tmp.Min
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return nil
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}
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