198ca1ad4d
In the index/store package introduce KVReader creates snapshot all read operations consistent from this snapshot must close to release introduce KVWriter only one writer active access to all operations allows for consisten read-modify-write must close to release introduce AssociativeMerge operation on batch allows efficient read-modify-write for associative operations used to consolidate updates to the term summary rows saves 1 set and 1 get op per shared instance of term in field In the index package introduced an IndexReader exposes a consisten snapshot of the index for searching At top level All searches now operate on a consisten snapshot of the index
189 lines
4.5 KiB
Go
189 lines
4.5 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 bleve
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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/search"
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"github.com/blevesearch/bleve/search/searchers"
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)
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type booleanQuery struct {
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Must Query `json:"must,omitempty"`
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Should Query `json:"should,omitempty"`
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MustNot Query `json:"must_not,omitempty"`
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BoostVal float64 `json:"boost,omitempty"`
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}
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// NewBooleanQuery creates a compound Query composed
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// of several other Query objects.
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// Result documents must satisify ALL of the
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// must Queries.
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// Result documents must satsify NONE of the must not
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// Queries.
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// If there are any should queries, result documents
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// must satisfy at least one of them.
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func NewBooleanQuery(must []Query, should []Query, mustNot []Query) *booleanQuery {
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min := 0.0
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if len(should) > 0 {
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min = 1.0
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}
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return NewBooleanQueryMinShould(must, should, mustNot, min)
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}
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// NewBooleanQueryMinShould is the same as
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// NewBooleanQuery, only it offers control of the
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// minimum number of should queries that must be
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// satisfied.
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func NewBooleanQueryMinShould(must []Query, should []Query, mustNot []Query, minShould float64) *booleanQuery {
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rv := booleanQuery{
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BoostVal: 1.0,
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}
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if len(must) > 0 {
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rv.Must = NewConjunctionQuery(must)
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}
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if len(should) > 0 {
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rv.Should = NewDisjunctionQueryMin(should, minShould)
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}
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if len(mustNot) > 0 {
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rv.MustNot = NewDisjunctionQuery(mustNot)
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}
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return &rv
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}
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func (q *booleanQuery) Boost() float64 {
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return q.BoostVal
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}
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func (q *booleanQuery) 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 *booleanQuery) Searcher(i index.IndexReader, m *IndexMapping, explain bool) (search.Searcher, error) {
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var err error
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var mustSearcher search.Searcher
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if q.Must != nil {
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mustSearcher, err = q.Must.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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var shouldSearcher search.Searcher
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if q.Should != nil {
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shouldSearcher, err = q.Should.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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var mustNotSearcher search.Searcher
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if q.MustNot != nil {
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mustNotSearcher, err = q.MustNot.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.NewBooleanSearcher(i, mustSearcher, shouldSearcher, mustNotSearcher, explain)
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}
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func (q *booleanQuery) Validate() error {
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if q.Must != nil {
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err := q.Must.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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if q.Should != nil {
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err := q.Should.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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if q.MustNot != nil {
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err := q.MustNot.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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if q.Must == nil && q.Should == nil {
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return ErrorBooleanQueryNeedsMustOrShould
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}
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return nil
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}
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func (q *booleanQuery) UnmarshalJSON(data []byte) error {
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tmp := struct {
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Must json.RawMessage `json:"must,omitempty"`
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Should json.RawMessage `json:"should,omitempty"`
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MustNot json.RawMessage `json:"must_not,omitempty"`
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BoostVal float64 `json:"boost,omitempty"`
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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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if tmp.Must != nil {
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q.Must, err = ParseQuery(tmp.Must)
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if err != nil {
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return err
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}
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_, isConjunctionQuery := q.Must.(*conjunctionQuery)
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if !isConjunctionQuery {
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return fmt.Errorf("must clause must be conjunction")
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}
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}
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if tmp.Should != nil {
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q.Should, err = ParseQuery(tmp.Should)
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if err != nil {
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return err
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}
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_, isDisjunctionQuery := q.Should.(*disjunctionQuery)
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if !isDisjunctionQuery {
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return fmt.Errorf("should clause must be disjunction")
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}
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}
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if tmp.MustNot != nil {
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q.MustNot, err = ParseQuery(tmp.MustNot)
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if err != nil {
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return err
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}
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_, isDisjunctionQuery := q.MustNot.(*disjunctionQuery)
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if !isDisjunctionQuery {
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return fmt.Errorf("must not clause must be disjunction")
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}
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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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return nil
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}
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func (q *booleanQuery) Field() string {
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return ""
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}
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func (q *booleanQuery) SetField(f string) Query {
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return q
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}
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