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- // Copyright (c) 2017 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 segment
-
- import (
- "github.com/RoaringBitmap/roaring"
- "github.com/blevesearch/bleve/index"
- "github.com/couchbase/vellum"
- )
-
- type EmptySegment struct{}
-
- func (e *EmptySegment) Dictionary(field string) (TermDictionary, error) {
- return &EmptyDictionary{}, nil
- }
-
- func (e *EmptySegment) VisitDocument(num uint64, visitor DocumentFieldValueVisitor) error {
- return nil
- }
-
- func (e *EmptySegment) DocID(num uint64) ([]byte, error) {
- return nil, nil
- }
-
- func (e *EmptySegment) Count() uint64 {
- return 0
- }
-
- func (e *EmptySegment) DocNumbers([]string) (*roaring.Bitmap, error) {
- r := roaring.NewBitmap()
- return r, nil
- }
-
- func (e *EmptySegment) Fields() []string {
- return []string{}
- }
-
- func (e *EmptySegment) Close() error {
- return nil
- }
-
- func (e *EmptySegment) Size() uint64 {
- return 0
- }
-
- func (e *EmptySegment) AddRef() {
- }
-
- func (e *EmptySegment) DecRef() error {
- return nil
- }
-
- type EmptyDictionary struct{}
-
- func (e *EmptyDictionary) PostingsList(term []byte,
- except *roaring.Bitmap, prealloc PostingsList) (PostingsList, error) {
- return &EmptyPostingsList{}, nil
- }
-
- func (e *EmptyDictionary) Iterator() DictionaryIterator {
- return &EmptyDictionaryIterator{}
- }
-
- func (e *EmptyDictionary) PrefixIterator(prefix string) DictionaryIterator {
- return &EmptyDictionaryIterator{}
- }
-
- func (e *EmptyDictionary) RangeIterator(start, end string) DictionaryIterator {
- return &EmptyDictionaryIterator{}
- }
-
- func (e *EmptyDictionary) AutomatonIterator(a vellum.Automaton,
- startKeyInclusive, endKeyExclusive []byte) DictionaryIterator {
- return &EmptyDictionaryIterator{}
- }
-
- func (e *EmptyDictionary) OnlyIterator(onlyTerms [][]byte,
- includeCount bool) DictionaryIterator {
- return &EmptyDictionaryIterator{}
- }
-
- func (e *EmptyDictionary) Contains(key []byte) (bool, error) {
- return false, nil
- }
-
- type EmptyDictionaryIterator struct{}
-
- func (e *EmptyDictionaryIterator) Next() (*index.DictEntry, error) {
- return nil, nil
- }
-
- func (e *EmptyDictionaryIterator) Contains(key []byte) (bool, error) {
- return false, nil
- }
-
- type EmptyPostingsList struct{}
-
- func (e *EmptyPostingsList) Iterator(includeFreq, includeNorm, includeLocations bool,
- prealloc PostingsIterator) PostingsIterator {
- return &EmptyPostingsIterator{}
- }
-
- func (e *EmptyPostingsList) Size() int {
- return 0
- }
-
- func (e *EmptyPostingsList) Count() uint64 {
- return 0
- }
-
- type EmptyPostingsIterator struct{}
-
- func (e *EmptyPostingsIterator) Next() (Posting, error) {
- return nil, nil
- }
-
- func (e *EmptyPostingsIterator) Advance(uint64) (Posting, error) {
- return nil, nil
- }
-
- func (e *EmptyPostingsIterator) Size() int {
- return 0
- }
-
- var AnEmptyPostingsIterator = &EmptyPostingsIterator{}
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