initial commit

vendor/github.com/blevesearch/bleve/index/upside_down/field_dict.go

@@ -0,0 +1,67 @@
+//  Copyright (c) 2014 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 upside_down
+
+import (
+	"fmt"
+
+	"github.com/blevesearch/bleve/index"
+	"github.com/blevesearch/bleve/index/store"
+)
+
+type UpsideDownCouchFieldDict struct {
+	indexReader *IndexReader
+	iterator    store.KVIterator
+	field       uint16
+}
+
+func newUpsideDownCouchFieldDict(indexReader *IndexReader, field uint16, startTerm, endTerm []byte) (*UpsideDownCouchFieldDict, error) {
+
+	startKey := NewDictionaryRow(startTerm, field, 0).Key()
+	if endTerm == nil {
+		endTerm = []byte{ByteSeparator}
+	} else {
+		endTerm = incrementBytes(endTerm)
+	}
+	endKey := NewDictionaryRow(endTerm, field, 0).Key()
+
+	it := indexReader.kvreader.RangeIterator(startKey, endKey)
+
+	return &UpsideDownCouchFieldDict{
+		indexReader: indexReader,
+		iterator:    it,
+		field:       field,
+	}, nil
+
+}
+
+func (r *UpsideDownCouchFieldDict) Next() (*index.DictEntry, error) {
+	key, val, valid := r.iterator.Current()
+	if !valid {
+		return nil, nil
+	}
+
+	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.iterator.Next()
+	return &rv, nil
+
+}
+
+func (r *UpsideDownCouchFieldDict) Close() error {
+	return r.iterator.Close()
+}