forked from blevesearch/bleve
/
reader_dict.go
70 lines (61 loc) · 1.91 KB
/
reader_dict.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 firestorm
import (
"fmt"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/index/store"
)
type firestormDictionaryReader struct {
r *firestormReader
field uint16
start []byte
i store.KVIterator
}
func newFirestormDictionaryReader(r *firestormReader, field uint16, start, end []byte) (*firestormDictionaryReader, error) {
startKey := DictionaryRowKey(field, start)
logger.Printf("start key '%s' - % x", startKey, startKey)
if end == nil {
end = []byte{ByteSeparator}
}
endKey := DictionaryRowKey(field, end)
logger.Printf("end key '%s' - % x", endKey, endKey)
i := r.r.RangeIterator(startKey, endKey)
rv := firestormDictionaryReader{
r: r,
field: field,
start: startKey,
i: i,
}
return &rv, nil
}
func (r *firestormDictionaryReader) Next() (*index.DictEntry, error) {
key, val, valid := r.i.Current()
if !valid {
return nil, nil
}
logger.Printf("see key '%s' - % x", key, key)
currRow, err := NewDictionaryRowKV(key, val)
if err != nil {
return nil, fmt.Errorf("unexpected error parsing dictionary row kv: %v", err)
}
rv := index.DictEntry{
Term: string(currRow.term),
Count: currRow.Count(),
}
// advance the iterator to the next term
r.i.Next()
return &rv, nil
}
func (r *firestormDictionaryReader) Close() error {
if r.i != nil {
return r.i.Close()
}
return nil
}