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142 lines
3.6 KiB
142 lines
3.6 KiB
// 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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"reflect"
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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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"github.com/blevesearch/bleve/size"
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)
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var reflectStaticSizeTermSearcher int
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func init() {
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var ts TermSearcher
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reflectStaticSizeTermSearcher = int(reflect.TypeOf(ts).Size())
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}
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type TermSearcher struct {
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indexReader index.IndexReader
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reader index.TermFieldReader
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scorer *scorer.TermQueryScorer
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tfd index.TermFieldDoc
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}
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func NewTermSearcher(indexReader index.IndexReader, term string, field string, boost float64, options search.SearcherOptions) (*TermSearcher, error) {
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return NewTermSearcherBytes(indexReader, []byte(term), field, boost, options)
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}
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func NewTermSearcherBytes(indexReader index.IndexReader, term []byte, field string, boost float64, options search.SearcherOptions) (*TermSearcher, error) {
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needFreqNorm := options.Score != "none"
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reader, err := indexReader.TermFieldReader(term, field, needFreqNorm, needFreqNorm, options.IncludeTermVectors)
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if err != nil {
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return nil, err
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}
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return newTermSearcherFromReader(indexReader, reader, term, field, boost, options)
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}
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func newTermSearcherFromReader(indexReader index.IndexReader, reader index.TermFieldReader,
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term []byte, field string, boost float64, options search.SearcherOptions) (*TermSearcher, error) {
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count, err := indexReader.DocCount()
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if err != nil {
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_ = reader.Close()
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return nil, err
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}
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scorer := scorer.NewTermQueryScorer(term, field, boost, count, reader.Count(), options)
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return &TermSearcher{
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indexReader: indexReader,
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reader: reader,
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scorer: scorer,
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}, nil
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}
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func (s *TermSearcher) Size() int {
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return reflectStaticSizeTermSearcher + size.SizeOfPtr +
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s.reader.Size() +
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s.tfd.Size() +
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s.scorer.Size()
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}
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func (s *TermSearcher) Count() uint64 {
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return s.reader.Count()
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}
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func (s *TermSearcher) Weight() float64 {
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return s.scorer.Weight()
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}
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func (s *TermSearcher) SetQueryNorm(qnorm float64) {
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s.scorer.SetQueryNorm(qnorm)
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}
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func (s *TermSearcher) Next(ctx *search.SearchContext) (*search.DocumentMatch, error) {
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termMatch, err := s.reader.Next(s.tfd.Reset())
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if err != nil {
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return nil, err
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}
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if termMatch == nil {
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return nil, nil
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}
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// score match
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docMatch := s.scorer.Score(ctx, termMatch)
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// return doc match
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return docMatch, nil
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}
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func (s *TermSearcher) Advance(ctx *search.SearchContext, ID index.IndexInternalID) (*search.DocumentMatch, error) {
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termMatch, err := s.reader.Advance(ID, s.tfd.Reset())
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if err != nil {
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return nil, err
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}
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if termMatch == nil {
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return nil, nil
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}
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// score match
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docMatch := s.scorer.Score(ctx, termMatch)
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// return doc match
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return docMatch, nil
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}
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func (s *TermSearcher) Close() error {
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return s.reader.Close()
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}
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func (s *TermSearcher) Min() int {
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return 0
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}
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func (s *TermSearcher) DocumentMatchPoolSize() int {
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return 1
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}
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func (s *TermSearcher) Optimize(kind string, octx index.OptimizableContext) (
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index.OptimizableContext, error) {
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o, ok := s.reader.(index.Optimizable)
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if ok {
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return o.Optimize(kind, octx)
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}
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return nil, nil
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}
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