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
186 lines
5.1 KiB
Go
186 lines
5.1 KiB
Go
// 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 scorch
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import (
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"bytes"
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"fmt"
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"reflect"
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"sync/atomic"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/index/scorch/segment"
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"github.com/blevesearch/bleve/size"
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)
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var reflectStaticSizeIndexSnapshotTermFieldReader int
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func init() {
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var istfr IndexSnapshotTermFieldReader
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reflectStaticSizeIndexSnapshotTermFieldReader = int(reflect.TypeOf(istfr).Size())
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}
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type IndexSnapshotTermFieldReader struct {
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term []byte
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field string
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snapshot *IndexSnapshot
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dicts []segment.TermDictionary
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postings []segment.PostingsList
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iterators []segment.PostingsIterator
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segmentOffset int
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includeFreq bool
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includeNorm bool
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includeTermVectors bool
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currPosting segment.Posting
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currID index.IndexInternalID
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}
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func (i *IndexSnapshotTermFieldReader) Size() int {
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sizeInBytes := reflectStaticSizeIndexSnapshotTermFieldReader + size.SizeOfPtr +
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len(i.term) +
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len(i.field) +
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len(i.currID)
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for _, entry := range i.postings {
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sizeInBytes += entry.Size()
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}
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for _, entry := range i.iterators {
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sizeInBytes += entry.Size()
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}
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if i.currPosting != nil {
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sizeInBytes += i.currPosting.Size()
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}
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return sizeInBytes
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}
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func (i *IndexSnapshotTermFieldReader) Next(preAlloced *index.TermFieldDoc) (*index.TermFieldDoc, error) {
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rv := preAlloced
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if rv == nil {
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rv = &index.TermFieldDoc{}
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}
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// find the next hit
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for i.segmentOffset < len(i.iterators) {
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next, err := i.iterators[i.segmentOffset].Next()
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if err != nil {
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return nil, err
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}
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if next != nil {
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// make segment number into global number by adding offset
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globalOffset := i.snapshot.offsets[i.segmentOffset]
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nnum := next.Number()
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rv.ID = docNumberToBytes(rv.ID, nnum+globalOffset)
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i.postingToTermFieldDoc(next, rv)
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i.currID = rv.ID
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i.currPosting = next
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return rv, nil
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}
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i.segmentOffset++
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}
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return nil, nil
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}
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func (i *IndexSnapshotTermFieldReader) postingToTermFieldDoc(next segment.Posting, rv *index.TermFieldDoc) {
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if i.includeFreq {
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rv.Freq = next.Frequency()
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}
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if i.includeNorm {
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rv.Norm = next.Norm()
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}
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if i.includeTermVectors {
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locs := next.Locations()
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if cap(rv.Vectors) < len(locs) {
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rv.Vectors = make([]*index.TermFieldVector, len(locs))
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backing := make([]index.TermFieldVector, len(locs))
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for i := range backing {
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rv.Vectors[i] = &backing[i]
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}
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}
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rv.Vectors = rv.Vectors[:len(locs)]
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for i, loc := range locs {
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*rv.Vectors[i] = index.TermFieldVector{
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Start: loc.Start(),
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End: loc.End(),
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Pos: loc.Pos(),
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ArrayPositions: loc.ArrayPositions(),
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Field: loc.Field(),
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}
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}
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}
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}
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func (i *IndexSnapshotTermFieldReader) Advance(ID index.IndexInternalID, preAlloced *index.TermFieldDoc) (*index.TermFieldDoc, error) {
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// FIXME do something better
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// for now, if we need to seek backwards, then restart from the beginning
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if i.currPosting != nil && bytes.Compare(i.currID, ID) >= 0 {
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i2, err := i.snapshot.TermFieldReader(i.term, i.field,
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i.includeFreq, i.includeNorm, i.includeTermVectors)
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if err != nil {
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return nil, err
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}
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*i = *(i2.(*IndexSnapshotTermFieldReader))
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}
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num, err := docInternalToNumber(ID)
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if err != nil {
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return nil, fmt.Errorf("error converting to doc number % x - %v", ID, err)
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}
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segIndex, ldocNum := i.snapshot.segmentIndexAndLocalDocNumFromGlobal(num)
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if segIndex >= len(i.snapshot.segment) {
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return nil, fmt.Errorf("computed segment index %d out of bounds %d",
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segIndex, len(i.snapshot.segment))
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}
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// skip directly to the target segment
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i.segmentOffset = segIndex
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next, err := i.iterators[i.segmentOffset].Advance(ldocNum)
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if err != nil {
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return nil, err
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}
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if next == nil {
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// we jumped directly to the segment that should have contained it
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// but it wasn't there, so reuse Next() which should correctly
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// get the next hit after it (we moved i.segmentOffset)
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return i.Next(preAlloced)
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}
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if preAlloced == nil {
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preAlloced = &index.TermFieldDoc{}
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}
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preAlloced.ID = docNumberToBytes(preAlloced.ID, next.Number()+
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i.snapshot.offsets[segIndex])
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i.postingToTermFieldDoc(next, preAlloced)
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i.currID = preAlloced.ID
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i.currPosting = next
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return preAlloced, nil
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}
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func (i *IndexSnapshotTermFieldReader) Count() uint64 {
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var rv uint64
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for _, posting := range i.postings {
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rv += posting.Count()
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}
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return rv
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}
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func (i *IndexSnapshotTermFieldReader) Close() error {
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if i.snapshot != nil {
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atomic.AddUint64(&i.snapshot.parent.stats.TotTermSearchersFinished, uint64(1))
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i.snapshot.recycleTermFieldReader(i)
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}
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return nil
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}
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