2968d3538a
removed analyzers (these are now built as needed through config) removed html chacter filter (now built as needed through config) added missing license header changed constructor signature of filters that cannot return errors filter constructors that can have errors, now have Must variant which panics change cdl2 tokenizer into filter (should only see lower-case input) new top level index api, closes #5 refactored index tests to not rely directly on analyzers moved query objects to top-level new top level search api, closes #12 top score collector allows skipping results index mapping supports _all by default, closes #3 and closes #6 index mapping supports disabled sections, closes #7 new http sub package with reusable http.Handler's, closes #22
174 lines
4.3 KiB
Go
174 lines
4.3 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 search
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import (
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"math"
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"sort"
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"github.com/couchbaselabs/bleve/index"
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)
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type TermConjunctionSearcher struct {
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index index.Index
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searchers OrderedSearcherList
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explain bool
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queryNorm float64
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currs []*DocumentMatch
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currentId string
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scorer *TermConjunctionQueryScorer
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}
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func NewTermConjunctionSearcher(index index.Index, qsearchers []Searcher, explain bool) (*TermConjunctionSearcher, error) {
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// build the downstream searchres
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searchers := make(OrderedSearcherList, len(qsearchers))
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for i, searcher := range qsearchers {
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searchers[i] = searcher
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}
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// sort the searchers
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sort.Sort(searchers)
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// build our searcher
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rv := TermConjunctionSearcher{
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index: index,
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explain: explain,
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searchers: searchers,
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currs: make([]*DocumentMatch, len(searchers)),
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scorer: NewTermConjunctionQueryScorer(explain),
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}
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rv.computeQueryNorm()
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err := rv.initSearchers()
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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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func (s *TermConjunctionSearcher) computeQueryNorm() {
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// first calculate sum of squared weights
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sumOfSquaredWeights := 0.0
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for _, termSearcher := range s.searchers {
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sumOfSquaredWeights += termSearcher.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 downsteam searchers the norm
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for _, termSearcher := range s.searchers {
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termSearcher.SetQueryNorm(s.queryNorm)
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}
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}
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func (s *TermConjunctionSearcher) 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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for i, termSearcher := range s.searchers {
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s.currs[i], err = termSearcher.Next()
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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 len(s.currs) > 0 {
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if s.currs[0] != nil {
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s.currentId = s.currs[0].ID
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} else {
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s.currentId = ""
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}
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}
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return nil
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}
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func (s *TermConjunctionSearcher) Weight() float64 {
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var rv float64
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for _, searcher := range s.searchers {
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rv += searcher.Weight()
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}
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return rv
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}
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func (s *TermConjunctionSearcher) SetQueryNorm(qnorm float64) {
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for _, searcher := range s.searchers {
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searcher.SetQueryNorm(qnorm)
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}
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}
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func (s *TermConjunctionSearcher) Next() (*DocumentMatch, error) {
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var rv *DocumentMatch
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var err error
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OUTER:
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for s.currentId != "" {
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for i, termSearcher := range s.searchers {
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if s.currs[i] != nil && s.currs[i].ID != s.currentId {
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// this reader doesn't have the currentId, try to advance
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s.currs[i], err = termSearcher.Advance(s.currentId)
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if err != nil {
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return nil, err
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}
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if s.currs[i] == nil {
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s.currentId = ""
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continue OUTER
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}
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if s.currs[i].ID != s.currentId {
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// we just advanced, so it doesn't match, it must be greater
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// no need to call next
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s.currentId = s.currs[i].ID
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continue OUTER
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}
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} else if s.currs[i] == nil {
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s.currentId = ""
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continue OUTER
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}
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}
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// if we get here, a doc matched all readers, sum the score and add it
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rv = s.scorer.Score(s.currs)
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// prepare for next entry
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s.currs[0], err = s.searchers[0].Next()
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if err != nil {
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return nil, err
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}
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if s.currs[0] == nil {
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s.currentId = ""
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} else {
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s.currentId = s.currs[0].ID
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}
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// don't continue now, wait for next call the Next()
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break
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}
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return rv, nil
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}
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func (s *TermConjunctionSearcher) Advance(ID string) (*DocumentMatch, error) {
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var err error
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for i, searcher := range s.searchers {
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s.currs[i], err = searcher.Advance(ID)
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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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s.currentId = ID
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return s.Next()
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}
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func (s *TermConjunctionSearcher) Count() uint64 {
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// for now return a worst case
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var sum uint64 = 0
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for _, searcher := range s.searchers {
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sum += searcher.Count()
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}
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return sum
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}
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func (s *TermConjunctionSearcher) Close() {
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for _, searcher := range s.searchers {
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searcher.Close()
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}
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}
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