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search_docid.go
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search_docid.go
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// Copyright (c) 2015 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 searchers
import (
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/search"
"github.com/blevesearch/bleve/search/scorers"
)
// DocIDSearcher returns documents matching a predefined set of identifiers.
type DocIDSearcher struct {
reader index.DocIDReader
scorer *scorers.ConstantScorer
count int
}
func NewDocIDSearcher(indexReader index.IndexReader, ids []string, boost float64,
explain bool) (searcher *DocIDSearcher, err error) {
reader, err := indexReader.DocIDReaderOnly(ids)
if err != nil {
return nil, err
}
scorer := scorers.NewConstantScorer(1.0, boost, explain)
return &DocIDSearcher{
scorer: scorer,
reader: reader,
count: len(ids),
}, nil
}
func (s *DocIDSearcher) Count() uint64 {
return uint64(s.count)
}
func (s *DocIDSearcher) Weight() float64 {
return s.scorer.Weight()
}
func (s *DocIDSearcher) SetQueryNorm(qnorm float64) {
s.scorer.SetQueryNorm(qnorm)
}
func (s *DocIDSearcher) Next(ctx *search.SearchContext) (*search.DocumentMatch, error) {
docidMatch, err := s.reader.Next()
if err != nil {
return nil, err
}
if docidMatch == nil {
return nil, nil
}
docMatch := s.scorer.Score(ctx, docidMatch)
return docMatch, nil
}
func (s *DocIDSearcher) Advance(ctx *search.SearchContext, ID index.IndexInternalID) (*search.DocumentMatch, error) {
docidMatch, err := s.reader.Advance(ID)
if err != nil {
return nil, err
}
if docidMatch == nil {
return nil, nil
}
docMatch := s.scorer.Score(ctx, docidMatch)
return docMatch, nil
}
func (s *DocIDSearcher) Close() error {
return nil
}
func (s *DocIDSearcher) Min() int {
return 0
}
func (s *DocIDSearcher) DocumentMatchPoolSize() int {
return 1
}