mirror of
https://github.com/go-gitea/gitea.git
synced 2024-12-04 14:46:57 -05:00
259 lines
6.1 KiB
Go
259 lines
6.1 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 searcher
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import (
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"fmt"
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"math"
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"sort"
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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/scorer"
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)
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// DisjunctionMaxClauseCount is a compile time setting that applications can
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// adjust to non-zero value to cause the DisjunctionSearcher to return an
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// error instead of exeucting searches when the size exceeds this value.
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var DisjunctionMaxClauseCount = 0
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type DisjunctionSearcher struct {
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indexReader index.IndexReader
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searchers OrderedSearcherList
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numSearchers int
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queryNorm float64
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currs []*search.DocumentMatch
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scorer *scorer.DisjunctionQueryScorer
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min int
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matching []*search.DocumentMatch
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matchingIdxs []int
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initialized bool
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}
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func tooManyClauses(count int) bool {
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if DisjunctionMaxClauseCount != 0 && count > DisjunctionMaxClauseCount {
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return true
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}
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return false
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}
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func tooManyClausesErr() error {
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return fmt.Errorf("TooManyClauses[maxClauseCount is set to %d]", DisjunctionMaxClauseCount)
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}
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func NewDisjunctionSearcher(indexReader index.IndexReader, qsearchers []search.Searcher, min float64, explain bool) (*DisjunctionSearcher, error) {
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if tooManyClauses(len(qsearchers)) {
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return nil, tooManyClausesErr()
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}
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// build the downstream searchers
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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(sort.Reverse(searchers))
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// build our searcher
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rv := DisjunctionSearcher{
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indexReader: indexReader,
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searchers: searchers,
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numSearchers: len(searchers),
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currs: make([]*search.DocumentMatch, len(searchers)),
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scorer: scorer.NewDisjunctionQueryScorer(explain),
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min: int(min),
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matching: make([]*search.DocumentMatch, len(searchers)),
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matchingIdxs: make([]int, len(searchers)),
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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 *DisjunctionSearcher) 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 downstream 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 *DisjunctionSearcher) initSearchers(ctx *search.SearchContext) 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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if s.currs[i] != nil {
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ctx.DocumentMatchPool.Put(s.currs[i])
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}
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s.currs[i], err = termSearcher.Next(ctx)
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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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err = s.updateMatches()
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if err != nil {
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return err
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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 *DisjunctionSearcher) updateMatches() error {
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matching := s.matching[:0]
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matchingIdxs := s.matchingIdxs[:0]
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for i := 0; i < len(s.currs); i++ {
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curr := s.currs[i]
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if curr == nil {
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continue
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}
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if len(matching) > 0 {
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cmp := curr.IndexInternalID.Compare(matching[0].IndexInternalID)
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if cmp > 0 {
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continue
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}
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if cmp < 0 {
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matching = matching[:0]
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matchingIdxs = matchingIdxs[:0]
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}
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}
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matching = append(matching, curr)
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matchingIdxs = append(matchingIdxs, i)
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}
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s.matching = matching
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s.matchingIdxs = matchingIdxs
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return nil
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}
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func (s *DisjunctionSearcher) 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 *DisjunctionSearcher) 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 *DisjunctionSearcher) Next(ctx *search.SearchContext) (*search.DocumentMatch, error) {
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if !s.initialized {
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err := s.initSearchers(ctx)
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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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var rv *search.DocumentMatch
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found := false
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for !found && len(s.matching) > 0 {
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if len(s.matching) >= s.min {
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found = true
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// score this match
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rv = s.scorer.Score(ctx, s.matching, len(s.matching), s.numSearchers)
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}
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// invoke next on all the matching searchers
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for _, i := range s.matchingIdxs {
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searcher := s.searchers[i]
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if s.currs[i] != rv {
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ctx.DocumentMatchPool.Put(s.currs[i])
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}
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s.currs[i], err = searcher.Next(ctx)
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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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err = s.updateMatches()
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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 rv, nil
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}
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func (s *DisjunctionSearcher) Advance(ctx *search.SearchContext, ID index.IndexInternalID) (*search.DocumentMatch, error) {
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if !s.initialized {
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err := s.initSearchers(ctx)
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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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// get all searchers pointing at their first match
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var err error
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for i, termSearcher := range s.searchers {
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if s.currs[i] != nil {
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ctx.DocumentMatchPool.Put(s.currs[i])
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}
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s.currs[i], err = termSearcher.Advance(ctx, 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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err = s.updateMatches()
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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(ctx)
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}
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func (s *DisjunctionSearcher) Count() uint64 {
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// for now return a worst case
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var sum uint64
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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 *DisjunctionSearcher) Close() (rv error) {
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for _, searcher := range s.searchers {
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err := searcher.Close()
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if err != nil && rv == nil {
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rv = err
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}
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}
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return rv
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}
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func (s *DisjunctionSearcher) Min() int {
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return s.min
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}
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func (s *DisjunctionSearcher) DocumentMatchPoolSize() int {
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rv := len(s.currs)
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for _, s := range s.searchers {
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rv += s.DocumentMatchPoolSize()
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}
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return rv
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}
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