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79 lines
2.2 KiB
79 lines
2.2 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 upsidedown
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import (
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"fmt"
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index "github.com/blevesearch/bleve_index_api"
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store "github.com/blevesearch/upsidedown_store_api"
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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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dictRow *DictionaryRow
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dictEntry *index.DictEntry
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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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dictRow: &DictionaryRow{}, // Pre-alloced, reused row.
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dictEntry: &index.DictEntry{}, // Pre-alloced, reused entry.
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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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err := r.dictRow.parseDictionaryK(key)
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if err != nil {
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return nil, fmt.Errorf("unexpected error parsing dictionary row key: %v", err)
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}
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err = r.dictRow.parseDictionaryV(val)
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if err != nil {
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return nil, fmt.Errorf("unexpected error parsing dictionary row val: %v", err)
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}
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r.dictEntry.Term = string(r.dictRow.term)
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r.dictEntry.Count = r.dictRow.count
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// advance the iterator to the next term
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r.iterator.Next()
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return r.dictEntry, 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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