2014-09-12 23:21:35 +02:00
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// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package upside_down
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import (
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"github.com/blevesearch/bleve/document"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/index/store"
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)
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type IndexReader struct {
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index *UpsideDownCouch
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kvreader store.KVReader
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docCount uint64
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}
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func (i *IndexReader) TermFieldReader(term []byte, fieldName string) (index.TermFieldReader, error) {
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2015-09-02 19:12:08 +02:00
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fieldIndex, fieldExists := i.index.fieldCache.FieldNamed(fieldName, false)
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2014-09-12 23:21:35 +02:00
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if fieldExists {
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return newUpsideDownCouchTermFieldReader(i, term, uint16(fieldIndex))
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}
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return newUpsideDownCouchTermFieldReader(i, []byte{ByteSeparator}, ^uint16(0))
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}
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2015-03-10 21:22:19 +01:00
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func (i *IndexReader) FieldDict(fieldName string) (index.FieldDict, error) {
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return i.FieldDictRange(fieldName, nil, nil)
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}
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func (i *IndexReader) FieldDictRange(fieldName string, startTerm []byte, endTerm []byte) (index.FieldDict, error) {
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2015-09-02 19:12:08 +02:00
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fieldIndex, fieldExists := i.index.fieldCache.FieldNamed(fieldName, false)
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2014-09-12 23:21:35 +02:00
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if fieldExists {
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2015-03-10 21:22:19 +01:00
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return newUpsideDownCouchFieldDict(i, uint16(fieldIndex), startTerm, endTerm)
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2014-09-12 23:21:35 +02:00
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}
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2015-03-10 21:22:19 +01:00
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return newUpsideDownCouchFieldDict(i, ^uint16(0), []byte{ByteSeparator}, []byte{})
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}
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func (i *IndexReader) FieldDictPrefix(fieldName string, termPrefix []byte) (index.FieldDict, error) {
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return i.FieldDictRange(fieldName, termPrefix, incrementBytes(termPrefix))
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2014-09-12 23:21:35 +02:00
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}
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func (i *IndexReader) DocIDReader(start, end string) (index.DocIDReader, error) {
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return newUpsideDownCouchDocIDReader(i, start, end)
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}
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2015-04-07 19:05:47 +02:00
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func (i *IndexReader) Document(id string) (doc *document.Document, err error) {
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2014-09-12 23:21:35 +02:00
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// first hit the back index to confirm doc exists
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var backIndexRow *BackIndexRow
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backIndexRow, err = i.index.backIndexRowForDoc(i.kvreader, id)
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if err != nil {
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return
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}
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if backIndexRow == nil {
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return
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2014-09-12 23:21:35 +02:00
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}
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doc = document.NewDocument(id)
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storedRow := NewStoredRow(id, 0, []uint64{}, 'x', nil)
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storedRowScanPrefix := storedRow.ScanPrefixForDoc()
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it := i.kvreader.PrefixIterator(storedRowScanPrefix)
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2015-04-07 19:05:47 +02:00
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defer func() {
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if cerr := it.Close(); err == nil && cerr != nil {
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err = cerr
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}
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}()
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2014-09-12 23:21:35 +02:00
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key, val, valid := it.Current()
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for valid {
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safeVal := make([]byte, len(val))
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copy(safeVal, val)
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var row *StoredRow
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row, err = NewStoredRowKV(key, safeVal)
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if err != nil {
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doc = nil
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return
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}
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if row != nil {
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2015-09-02 19:12:08 +02:00
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fieldName := i.index.fieldCache.FieldIndexed(row.field)
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2015-05-15 21:47:54 +02:00
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field := decodeFieldType(row.typ, fieldName, row.arrayPositions, row.value)
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if field != nil {
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doc.AddField(field)
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}
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}
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it.Next()
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key, val, valid = it.Current()
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}
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2015-04-07 19:05:47 +02:00
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return
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2014-09-12 23:21:35 +02:00
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}
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func (i *IndexReader) DocumentFieldTerms(id string) (index.FieldTerms, error) {
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back, err := i.index.backIndexRowForDoc(i.kvreader, id)
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if err != nil {
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return nil, err
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}
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rv := make(index.FieldTerms, len(back.termEntries))
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for _, entry := range back.termEntries {
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fieldName := i.index.fieldCache.FieldIndexed(uint16(*entry.Field))
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terms, ok := rv[fieldName]
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if !ok {
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terms = make([]string, 0)
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}
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terms = append(terms, *entry.Term)
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rv[fieldName] = terms
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}
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return rv, nil
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}
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2015-04-07 19:05:47 +02:00
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func (i *IndexReader) Fields() (fields []string, err error) {
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fields = make([]string, 0)
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it := i.kvreader.PrefixIterator([]byte{'f'})
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defer func() {
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if cerr := it.Close(); err == nil && cerr != nil {
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err = cerr
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}
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}()
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2014-09-12 23:21:35 +02:00
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key, val, valid := it.Current()
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for valid {
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2015-04-07 19:05:47 +02:00
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var row UpsideDownCouchRow
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row, err = ParseFromKeyValue(key, val)
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2014-09-12 23:21:35 +02:00
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if err != nil {
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fields = nil
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return
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2014-09-12 23:21:35 +02:00
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}
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if row != nil {
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fieldRow, ok := row.(*FieldRow)
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if ok {
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fields = append(fields, fieldRow.name)
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2014-09-12 23:21:35 +02:00
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}
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}
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it.Next()
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key, val, valid = it.Current()
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}
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2015-04-07 19:05:47 +02:00
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return
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2014-09-12 23:21:35 +02:00
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}
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func (i *IndexReader) GetInternal(key []byte) ([]byte, error) {
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internalRow := NewInternalRow(key, nil)
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return i.kvreader.Get(internalRow.Key())
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}
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func (i *IndexReader) DocCount() uint64 {
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return i.docCount
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}
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2015-03-06 20:46:29 +01:00
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func (i *IndexReader) Close() error {
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return i.kvreader.Close()
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2014-09-12 23:21:35 +02:00
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}
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2015-09-23 20:25:47 +02:00
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func incrementBytes(in []byte) []byte {
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rv := make([]byte, len(in))
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copy(rv, in)
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for i := len(rv) - 1; i >= 0; i-- {
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rv[i] = rv[i] + 1
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if rv[i] != 0 {
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// didn't overflow, so stop
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break
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}
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}
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return rv
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}
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