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// Copyright (c) 2014 Couchbase, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package searcher
import (
"reflect"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/search"
"github.com/blevesearch/bleve/search/scorer"
"github.com/blevesearch/bleve/size"
)
var reflectStaticSizeTermSearcher int
func init() {
var ts TermSearcher
reflectStaticSizeTermSearcher = int(reflect.TypeOf(ts).Size())
}
type TermSearcher struct {
indexReader index.IndexReader
reader index.TermFieldReader
scorer *scorer.TermQueryScorer
tfd index.TermFieldDoc
}
func NewTermSearcher(indexReader index.IndexReader, term string, field string, boost float64, options search.SearcherOptions) (*TermSearcher, error) {
return NewTermSearcherBytes(indexReader, []byte(term), field, boost, options)
}
func NewTermSearcherBytes(indexReader index.IndexReader, term []byte, field string, boost float64, options search.SearcherOptions) (*TermSearcher, error) {
needFreqNorm := options.Score != "none"
reader, err := indexReader.TermFieldReader(term, field, needFreqNorm, needFreqNorm, options.IncludeTermVectors)
if err != nil {
return nil, err
}
return newTermSearcherFromReader(indexReader, reader, term, field, boost, options)
}
func newTermSearcherFromReader(indexReader index.IndexReader, reader index.TermFieldReader,
term []byte, field string, boost float64, options search.SearcherOptions) (*TermSearcher, error) {
count, err := indexReader.DocCount()
if err != nil {
_ = reader.Close()
return nil, err
}
scorer := scorer.NewTermQueryScorer(term, field, boost, count, reader.Count(), options)
return &TermSearcher{
indexReader: indexReader,
reader: reader,
scorer: scorer,
}, nil
}
func (s *TermSearcher) Size() int {
return reflectStaticSizeTermSearcher + size.SizeOfPtr +
s.reader.Size() +
s.tfd.Size() +
s.scorer.Size()
}
func (s *TermSearcher) Count() uint64 {
return s.reader.Count()
}
func (s *TermSearcher) Weight() float64 {
return s.scorer.Weight()
}
func (s *TermSearcher) SetQueryNorm(qnorm float64) {
s.scorer.SetQueryNorm(qnorm)
}
func (s *TermSearcher) Next(ctx *search.SearchContext) (*search.DocumentMatch, error) {
termMatch, err := s.reader.Next(s.tfd.Reset())
if err != nil {
return nil, err
}
if termMatch == nil {
return nil, nil
}
// score match
docMatch := s.scorer.Score(ctx, termMatch)
// return doc match
return docMatch, nil
}
func (s *TermSearcher) Advance(ctx *search.SearchContext, ID index.IndexInternalID) (*search.DocumentMatch, error) {
termMatch, err := s.reader.Advance(ID, s.tfd.Reset())
if err != nil {
return nil, err
}
if termMatch == nil {
return nil, nil
}
// score match
docMatch := s.scorer.Score(ctx, termMatch)
// return doc match
return docMatch, nil
}
func (s *TermSearcher) Close() error {
return s.reader.Close()
}
func (s *TermSearcher) Min() int {
return 0
}
func (s *TermSearcher) DocumentMatchPoolSize() int {
return 1
}
func (s *TermSearcher) Optimize(kind string, octx index.OptimizableContext) (
index.OptimizableContext, error) {
o, ok := s.reader.(index.Optimizable)
if ok {
return o.Optimize(kind, octx)
}
return octx, nil
}
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