68 lines
1.8 KiB
Go
68 lines
1.8 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 upsidedown
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import (
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"fmt"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/index/store"
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)
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type UpsideDownCouchFieldDict struct {
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indexReader *IndexReader
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iterator store.KVIterator
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field uint16
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}
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func newUpsideDownCouchFieldDict(indexReader *IndexReader, field uint16, startTerm, endTerm []byte) (*UpsideDownCouchFieldDict, error) {
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startKey := NewDictionaryRow(startTerm, field, 0).Key()
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if endTerm == nil {
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endTerm = []byte{ByteSeparator}
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} else {
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endTerm = incrementBytes(endTerm)
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}
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endKey := NewDictionaryRow(endTerm, field, 0).Key()
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it := indexReader.kvreader.RangeIterator(startKey, endKey)
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return &UpsideDownCouchFieldDict{
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indexReader: indexReader,
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iterator: it,
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field: field,
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}, nil
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}
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func (r *UpsideDownCouchFieldDict) Next() (*index.DictEntry, error) {
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key, val, valid := r.iterator.Current()
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if !valid {
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return nil, nil
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}
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currRow, err := NewDictionaryRowKV(key, val)
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if err != nil {
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return nil, fmt.Errorf("unexpected error parsing dictionary row kv: %v", err)
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}
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rv := index.DictEntry{
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Term: string(currRow.term),
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Count: currRow.count,
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}
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// advance the iterator to the next term
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r.iterator.Next()
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return &rv, nil
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}
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func (r *UpsideDownCouchFieldDict) Close() error {
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return r.iterator.Close()
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}
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