forked from blevesearch/bleve
/
index_reader.go
203 lines (179 loc) · 5.34 KB
/
index_reader.go
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// 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 upsidedown
import (
"github.com/blevesearch/bleve/document"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/index/store"
)
type IndexReader struct {
index *UpsideDownCouch
kvreader store.KVReader
docCount uint64
}
func (i *IndexReader) TermFieldReader(term []byte, fieldName string, includeFreq, includeNorm, includeTermVectors bool) (index.TermFieldReader, error) {
fieldIndex, fieldExists := i.index.fieldCache.FieldNamed(fieldName, false)
if fieldExists {
return newUpsideDownCouchTermFieldReader(i, term, uint16(fieldIndex), includeFreq, includeNorm, includeTermVectors)
}
return newUpsideDownCouchTermFieldReader(i, []byte{ByteSeparator}, ^uint16(0), includeFreq, includeNorm, includeTermVectors)
}
func (i *IndexReader) FieldDict(fieldName string) (index.FieldDict, error) {
return i.FieldDictRange(fieldName, nil, nil)
}
func (i *IndexReader) FieldDictRange(fieldName string, startTerm []byte, endTerm []byte) (index.FieldDict, error) {
fieldIndex, fieldExists := i.index.fieldCache.FieldNamed(fieldName, false)
if fieldExists {
return newUpsideDownCouchFieldDict(i, uint16(fieldIndex), startTerm, endTerm)
}
return newUpsideDownCouchFieldDict(i, ^uint16(0), []byte{ByteSeparator}, []byte{})
}
func (i *IndexReader) FieldDictPrefix(fieldName string, termPrefix []byte) (index.FieldDict, error) {
return i.FieldDictRange(fieldName, termPrefix, termPrefix)
}
func (i *IndexReader) DocIDReaderAll() (index.DocIDReader, error) {
return newUpsideDownCouchDocIDReader(i)
}
func (i *IndexReader) DocIDReaderOnly(ids []string) (index.DocIDReader, error) {
return newUpsideDownCouchDocIDReaderOnly(i, ids)
}
func (i *IndexReader) Document(id string) (doc *document.Document, err error) {
// first hit the back index to confirm doc exists
var backIndexRow *BackIndexRow
backIndexRow, err = backIndexRowForDoc(i.kvreader, []byte(id))
if err != nil {
return
}
if backIndexRow == nil {
return
}
doc = document.NewDocument(id)
storedRow := NewStoredRow([]byte(id), 0, []uint64{}, 'x', nil)
storedRowScanPrefix := storedRow.ScanPrefixForDoc()
it := i.kvreader.PrefixIterator(storedRowScanPrefix)
defer func() {
if cerr := it.Close(); err == nil && cerr != nil {
err = cerr
}
}()
key, val, valid := it.Current()
for valid {
safeVal := make([]byte, len(val))
copy(safeVal, val)
var row *StoredRow
row, err = NewStoredRowKV(key, safeVal)
if err != nil {
doc = nil
return
}
if row != nil {
fieldName := i.index.fieldCache.FieldIndexed(row.field)
field := decodeFieldType(row.typ, fieldName, row.arrayPositions, row.value)
if field != nil {
doc.AddField(field)
}
}
it.Next()
key, val, valid = it.Current()
}
return
}
func (i *IndexReader) DocumentVisitFieldTerms(id index.IndexInternalID, fields []string, visitor index.DocumentFieldTermVisitor) error {
fieldsMap := make(map[uint16]string, len(fields))
for _, f := range fields {
id, ok := i.index.fieldCache.FieldNamed(f, false)
if ok {
fieldsMap[id] = f
}
}
tempRow := BackIndexRow{
doc: id,
}
keyBuf := GetRowBuffer()
if tempRow.KeySize() > len(keyBuf) {
keyBuf = make([]byte, 2*tempRow.KeySize())
}
defer PutRowBuffer(keyBuf)
keySize, err := tempRow.KeyTo(keyBuf)
if err != nil {
return err
}
value, err := i.kvreader.Get(keyBuf[:keySize])
if err != nil {
return err
}
if value == nil {
return nil
}
return visitBackIndexRow(value, func(field uint32, term []byte) {
if field, ok := fieldsMap[uint16(field)]; ok {
visitor(field, term)
}
})
}
func (i *IndexReader) Fields() (fields []string, err error) {
fields = make([]string, 0)
it := i.kvreader.PrefixIterator([]byte{'f'})
defer func() {
if cerr := it.Close(); err == nil && cerr != nil {
err = cerr
}
}()
key, val, valid := it.Current()
for valid {
var row UpsideDownCouchRow
row, err = ParseFromKeyValue(key, val)
if err != nil {
fields = nil
return
}
if row != nil {
fieldRow, ok := row.(*FieldRow)
if ok {
fields = append(fields, fieldRow.name)
}
}
it.Next()
key, val, valid = it.Current()
}
return
}
func (i *IndexReader) GetInternal(key []byte) ([]byte, error) {
internalRow := NewInternalRow(key, nil)
return i.kvreader.Get(internalRow.Key())
}
func (i *IndexReader) DocCount() (uint64, error) {
return i.docCount, nil
}
func (i *IndexReader) Close() error {
return i.kvreader.Close()
}
func (i *IndexReader) ExternalID(id index.IndexInternalID) (string, error) {
return string(id), nil
}
func (i *IndexReader) InternalID(id string) (index.IndexInternalID, error) {
return index.IndexInternalID(id), nil
}
func incrementBytes(in []byte) []byte {
rv := make([]byte, len(in))
copy(rv, in)
for i := len(rv) - 1; i >= 0; i-- {
rv[i] = rv[i] + 1
if rv[i] != 0 {
// didn't overflow, so stop
break
}
}
return rv
}