76 lines
2.1 KiB
Go
76 lines
2.1 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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"github.com/couchbaselabs/bleve/index"
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)
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type TermPrefixSearcher struct {
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index index.Index
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prefix string
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field string
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explain bool
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searcher *DisjunctionSearcher
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}
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func NewTermPrefixSearcher(index index.Index, prefix string, field string, boost float64, explain bool) (*TermPrefixSearcher, error) {
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// find the terms with this prefix
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fieldReader, err := index.FieldReader(field, []byte(prefix), []byte(prefix))
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// enumerate all the terms in the range
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qsearchers := make([]Searcher, 0, 25)
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tfd, err := fieldReader.Next()
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for err == nil && tfd != nil {
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qsearcher, err := NewTermSearcher(index, string(tfd.Term), field, 1.0, explain)
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if err != nil {
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return nil, err
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}
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qsearchers = append(qsearchers, qsearcher)
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tfd, err = fieldReader.Next()
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}
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// build disjunction searcher of these ranges
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searcher, err := NewDisjunctionSearcher(index, qsearchers, 0, explain)
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if err != nil {
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return nil, err
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}
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return &TermPrefixSearcher{
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index: index,
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prefix: prefix,
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field: field,
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explain: explain,
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searcher: searcher,
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}, nil
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}
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func (s *TermPrefixSearcher) Count() uint64 {
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return s.searcher.Count()
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}
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func (s *TermPrefixSearcher) Weight() float64 {
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return s.searcher.Weight()
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}
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func (s *TermPrefixSearcher) SetQueryNorm(qnorm float64) {
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s.searcher.SetQueryNorm(qnorm)
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}
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func (s *TermPrefixSearcher) Next() (*DocumentMatch, error) {
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return s.searcher.Next()
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}
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func (s *TermPrefixSearcher) Advance(ID string) (*DocumentMatch, error) {
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return s.searcher.Next()
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}
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func (s *TermPrefixSearcher) Close() {
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s.searcher.Close()
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}
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