128 lines
3.2 KiB
Go
128 lines
3.2 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and 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/searchers"
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)
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type DisjunctionQuery struct {
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Disjuncts []Query `json:"disjuncts"`
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BoostVal float64 `json:"boost,omitempty"`
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MinVal float64 `json:"min"`
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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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BoostVal: 1.0,
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}
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}
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// NewDisjunctionQueryMin creates a new compound Query.
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// Result documents satisfy at least min Queries.
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func NewDisjunctionQueryMin(disjuncts []Query, min float64) *DisjunctionQuery {
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return &DisjunctionQuery{
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Disjuncts: disjuncts,
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BoostVal: 1.0,
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MinVal: min,
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}
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}
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func (q *DisjunctionQuery) Boost() float64 {
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return q.BoostVal
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}
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func (q *DisjunctionQuery) SetBoost(b float64) Query {
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q.BoostVal = b
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return q
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}
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func (q *DisjunctionQuery) AddQuery(aq Query) Query {
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q.Disjuncts = append(q.Disjuncts, aq)
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return q
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}
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func (q *DisjunctionQuery) Min() float64 {
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return q.MinVal
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}
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func (q *DisjunctionQuery) SetMin(m float64) Query {
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q.MinVal = m
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return q
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}
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func (q *DisjunctionQuery) Searcher(i index.IndexReader, m mapping.IndexMapping, explain bool) (search.Searcher, error) {
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ss := make([]search.Searcher, len(q.Disjuncts))
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for in, disjunct := range q.Disjuncts {
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var err error
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ss[in], err = disjunct.Searcher(i, m, explain)
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if err != nil {
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return nil, err
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}
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}
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return searchers.NewDisjunctionSearcher(i, ss, q.MinVal, explain)
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}
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func (q *DisjunctionQuery) Validate() error {
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if int(q.MinVal) > 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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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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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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BoostVal float64 `json:"boost,omitempty"`
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MinVal 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.BoostVal
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if q.BoostVal == 0 {
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q.BoostVal = 1
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}
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q.MinVal = tmp.MinVal
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return nil
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}
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func (q *DisjunctionQuery) Field() string {
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return ""
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}
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func (q *DisjunctionQuery) SetField(f string) Query {
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return q
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}
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