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