mirror of
https://github.com/go-gitea/gitea.git
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* update bleve to master b17287a86f6cac923a5d886e10618df994eeb54b6724eac2e3b8dde89cfbe3a2 * remove unused pkg from dep file * change bleve from master to recent revision
227 lines
5.9 KiB
Go
227 lines
5.9 KiB
Go
// Copyright (c) 2014 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 upsidedown
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import (
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"reflect"
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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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var reflectStaticSizeIndexReader int
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func init() {
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var ir IndexReader
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reflectStaticSizeIndexReader = int(reflect.TypeOf(ir).Size())
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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, includeFreq, includeNorm, includeTermVectors bool) (index.TermFieldReader, error) {
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fieldIndex, fieldExists := i.index.fieldCache.FieldNamed(fieldName, false)
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if fieldExists {
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return newUpsideDownCouchTermFieldReader(i, term, uint16(fieldIndex), includeFreq, includeNorm, includeTermVectors)
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}
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return newUpsideDownCouchTermFieldReader(i, []byte{ByteSeparator}, ^uint16(0), includeFreq, includeNorm, includeTermVectors)
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}
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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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fieldIndex, fieldExists := i.index.fieldCache.FieldNamed(fieldName, false)
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if fieldExists {
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return newUpsideDownCouchFieldDict(i, uint16(fieldIndex), startTerm, endTerm)
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}
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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, termPrefix)
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}
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func (i *IndexReader) DocIDReaderAll() (index.DocIDReader, error) {
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return newUpsideDownCouchDocIDReader(i)
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}
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func (i *IndexReader) DocIDReaderOnly(ids []string) (index.DocIDReader, error) {
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return newUpsideDownCouchDocIDReaderOnly(i, ids)
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}
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func (i *IndexReader) Document(id string) (doc *document.Document, err error) {
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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 = backIndexRowForDoc(i.kvreader, []byte(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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}
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doc = document.NewDocument(id)
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storedRow := NewStoredRow([]byte(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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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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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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fieldName := i.index.fieldCache.FieldIndexed(row.field)
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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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return
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}
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func (i *IndexReader) DocumentVisitFieldTerms(id index.IndexInternalID, fields []string, visitor index.DocumentFieldTermVisitor) error {
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fieldsMap := make(map[uint16]string, len(fields))
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for _, f := range fields {
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id, ok := i.index.fieldCache.FieldNamed(f, false)
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if ok {
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fieldsMap[id] = f
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}
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}
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tempRow := BackIndexRow{
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doc: id,
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}
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keyBuf := GetRowBuffer()
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if tempRow.KeySize() > len(keyBuf) {
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keyBuf = make([]byte, 2*tempRow.KeySize())
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}
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defer PutRowBuffer(keyBuf)
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keySize, err := tempRow.KeyTo(keyBuf)
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if err != nil {
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return err
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}
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value, err := i.kvreader.Get(keyBuf[:keySize])
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if err != nil {
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return err
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}
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if value == nil {
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return nil
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}
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return visitBackIndexRow(value, func(field uint32, term []byte) {
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if field, ok := fieldsMap[uint16(field)]; ok {
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visitor(field, term)
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}
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})
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}
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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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key, val, valid := it.Current()
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for valid {
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var row UpsideDownCouchRow
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row, err = ParseFromKeyValue(key, val)
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if err != nil {
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fields = nil
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return
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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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}
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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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return
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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, error) {
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return i.docCount, nil
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}
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func (i *IndexReader) Close() error {
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return i.kvreader.Close()
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}
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func (i *IndexReader) ExternalID(id index.IndexInternalID) (string, error) {
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return string(id), nil
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}
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func (i *IndexReader) InternalID(id string) (index.IndexInternalID, error) {
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return index.IndexInternalID(id), nil
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}
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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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func (i *IndexReader) DocValueReader(fields []string) (index.DocValueReader, error) {
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return &DocValueReader{i: i, fields: fields}, nil
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}
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type DocValueReader struct {
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i *IndexReader
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fields []string
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}
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func (dvr *DocValueReader) VisitDocValues(id index.IndexInternalID,
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visitor index.DocumentFieldTermVisitor) error {
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return dvr.i.DocumentVisitFieldTerms(id, dvr.fields, visitor)
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}
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