e188fe35f7
instead of separate DocumentMatch/DocumentMatchInternal rules are simple, everything operates on the IndexInternalID field until the results are returned, then ID is set correctly the IndexInternalID field is not exported to JSON
198 lines
4.6 KiB
Go
198 lines
4.6 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 searchers
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import (
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"math"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/search"
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)
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type PhraseSearcher struct {
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initialized bool
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indexReader index.IndexReader
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mustSearcher *ConjunctionSearcher
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queryNorm float64
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currMust *search.DocumentMatch
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slop int
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terms []string
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}
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func NewPhraseSearcher(indexReader index.IndexReader, mustSearcher *ConjunctionSearcher, terms []string) (*PhraseSearcher, error) {
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// build our searcher
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rv := PhraseSearcher{
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indexReader: indexReader,
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mustSearcher: mustSearcher,
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terms: terms,
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}
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rv.computeQueryNorm()
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return &rv, nil
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}
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func (s *PhraseSearcher) computeQueryNorm() {
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// first calculate sum of squared weights
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sumOfSquaredWeights := 0.0
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if s.mustSearcher != nil {
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sumOfSquaredWeights += s.mustSearcher.Weight()
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}
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// now compute query norm from this
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s.queryNorm = 1.0 / math.Sqrt(sumOfSquaredWeights)
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// finally tell all the downstream searchers the norm
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if s.mustSearcher != nil {
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s.mustSearcher.SetQueryNorm(s.queryNorm)
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}
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}
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func (s *PhraseSearcher) initSearchers() error {
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var err error
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// get all searchers pointing at their first match
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if s.mustSearcher != nil {
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s.currMust, err = s.mustSearcher.Next(nil)
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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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s.initialized = true
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return nil
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}
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func (s *PhraseSearcher) advanceNextMust() error {
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var err error
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if s.mustSearcher != nil {
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s.currMust, err = s.mustSearcher.Next(nil)
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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 (s *PhraseSearcher) Weight() float64 {
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var rv float64
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rv += s.mustSearcher.Weight()
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return rv
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}
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func (s *PhraseSearcher) SetQueryNorm(qnorm float64) {
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s.mustSearcher.SetQueryNorm(qnorm)
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}
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func (s *PhraseSearcher) Next(preAllocated *search.DocumentMatch) (*search.DocumentMatch, error) {
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if !s.initialized {
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err := s.initSearchers()
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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 rv *search.DocumentMatch
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for s.currMust != nil {
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rvftlm := make(search.FieldTermLocationMap, 0)
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freq := 0
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firstTerm := s.terms[0]
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for field, termLocMap := range s.currMust.Locations {
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rvtlm := make(search.TermLocationMap, 0)
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locations, ok := termLocMap[firstTerm]
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if ok {
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OUTER:
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for _, location := range locations {
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crvtlm := make(search.TermLocationMap, 0)
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INNER:
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for i := 0; i < len(s.terms); i++ {
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nextTerm := s.terms[i]
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if nextTerm != "" {
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// look through all these term locations
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// to try and find the correct offsets
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nextLocations, ok := termLocMap[nextTerm]
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if ok {
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for _, nextLocation := range nextLocations {
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if nextLocation.Pos == location.Pos+float64(i) && nextLocation.SameArrayElement(location) {
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// found a location match for this term
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crvtlm.AddLocation(nextTerm, nextLocation)
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continue INNER
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}
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}
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// if we got here we didn't find a location match for this term
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continue OUTER
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} else {
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continue OUTER
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}
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}
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}
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// if we got here all the terms matched
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freq++
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search.MergeTermLocationMaps(rvtlm, crvtlm)
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rvftlm[field] = rvtlm
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}
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}
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}
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if freq > 0 {
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// return match
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rv = s.currMust
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rv.Locations = rvftlm
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err := s.advanceNextMust()
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if err != nil {
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return nil, err
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}
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return rv, nil
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}
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err := s.advanceNextMust()
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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 nil, nil
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}
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func (s *PhraseSearcher) Advance(ID index.IndexInternalID, preAllocated *search.DocumentMatch) (*search.DocumentMatch, error) {
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if !s.initialized {
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err := s.initSearchers()
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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 err error
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s.currMust, err = s.mustSearcher.Advance(ID, nil)
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if err != nil {
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return nil, err
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}
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return s.Next(preAllocated)
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}
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func (s *PhraseSearcher) Count() uint64 {
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// for now return a worst case
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var sum uint64
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sum += s.mustSearcher.Count()
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return sum
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}
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func (s *PhraseSearcher) Close() error {
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if s.mustSearcher != nil {
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err := s.mustSearcher.Close()
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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 (s *PhraseSearcher) Min() int {
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return 0
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}
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