forked from blevesearch/bleve
/
unadorned.go
161 lines (131 loc) · 4.24 KB
/
unadorned.go
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// Copyright (c) 2020 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 scorch
import (
"github.com/RoaringBitmap/roaring"
segment "github.com/blevesearch/scorch_segment_api/v2"
"math"
"reflect"
)
var reflectStaticSizeUnadornedPostingsIteratorBitmap int
var reflectStaticSizeUnadornedPostingsIterator1Hit int
var reflectStaticSizeUnadornedPosting int
func init() {
var pib unadornedPostingsIteratorBitmap
reflectStaticSizeUnadornedPostingsIteratorBitmap = int(reflect.TypeOf(pib).Size())
var pi1h unadornedPostingsIterator1Hit
reflectStaticSizeUnadornedPostingsIterator1Hit = int(reflect.TypeOf(pi1h).Size())
var up UnadornedPosting
reflectStaticSizeUnadornedPosting = int(reflect.TypeOf(up).Size())
}
type unadornedPostingsIteratorBitmap struct {
actual roaring.IntPeekable
actualBM *roaring.Bitmap
}
func (i *unadornedPostingsIteratorBitmap) Next() (segment.Posting, error) {
return i.nextAtOrAfter(0)
}
func (i *unadornedPostingsIteratorBitmap) Advance(docNum uint64) (segment.Posting, error) {
return i.nextAtOrAfter(docNum)
}
func (i *unadornedPostingsIteratorBitmap) nextAtOrAfter(atOrAfter uint64) (segment.Posting, error) {
docNum, exists := i.nextDocNumAtOrAfter(atOrAfter)
if !exists {
return nil, nil
}
return UnadornedPosting(docNum), nil
}
func (i *unadornedPostingsIteratorBitmap) nextDocNumAtOrAfter(atOrAfter uint64) (uint64, bool) {
if i.actual == nil || !i.actual.HasNext() {
return 0, false
}
i.actual.AdvanceIfNeeded(uint32(atOrAfter))
if !i.actual.HasNext() {
return 0, false // couldn't find anything
}
return uint64(i.actual.Next()), true
}
func (i *unadornedPostingsIteratorBitmap) Size() int {
return reflectStaticSizeUnadornedPostingsIteratorBitmap
}
func (i *unadornedPostingsIteratorBitmap) ActualBitmap() *roaring.Bitmap {
return i.actualBM
}
func (i *unadornedPostingsIteratorBitmap) DocNum1Hit() (uint64, bool) {
return 0, false
}
func (i *unadornedPostingsIteratorBitmap) ReplaceActual(actual *roaring.Bitmap) {
i.actualBM = actual
i.actual = actual.Iterator()
}
func newUnadornedPostingsIteratorFromBitmap(bm *roaring.Bitmap) segment.PostingsIterator {
return &unadornedPostingsIteratorBitmap{
actualBM: bm,
actual: bm.Iterator(),
}
}
const docNum1HitFinished = math.MaxUint64
type unadornedPostingsIterator1Hit struct {
docNum uint64
}
func (i *unadornedPostingsIterator1Hit) Next() (segment.Posting, error) {
return i.nextAtOrAfter(0)
}
func (i *unadornedPostingsIterator1Hit) Advance(docNum uint64) (segment.Posting, error) {
return i.nextAtOrAfter(docNum)
}
func (i *unadornedPostingsIterator1Hit) nextAtOrAfter(atOrAfter uint64) (segment.Posting, error) {
docNum, exists := i.nextDocNumAtOrAfter(atOrAfter)
if !exists {
return nil, nil
}
return UnadornedPosting(docNum), nil
}
func (i *unadornedPostingsIterator1Hit) nextDocNumAtOrAfter(atOrAfter uint64) (uint64, bool) {
if i.docNum == docNum1HitFinished {
return 0, false
}
if i.docNum < atOrAfter {
// advanced past our 1-hit
i.docNum = docNum1HitFinished // consume our 1-hit docNum
return 0, false
}
docNum := i.docNum
i.docNum = docNum1HitFinished // consume our 1-hit docNum
return docNum, true
}
func (i *unadornedPostingsIterator1Hit) Size() int {
return reflectStaticSizeUnadornedPostingsIterator1Hit
}
func newUnadornedPostingsIteratorFrom1Hit(docNum1Hit uint64) segment.PostingsIterator {
return &unadornedPostingsIterator1Hit{
docNum1Hit,
}
}
type UnadornedPosting uint64
func (p UnadornedPosting) Number() uint64 {
return uint64(p)
}
func (p UnadornedPosting) Frequency() uint64 {
return 0
}
func (p UnadornedPosting) Norm() float64 {
return 0
}
func (p UnadornedPosting) Locations() []segment.Location {
return nil
}
func (p UnadornedPosting) Size() int {
return reflectStaticSizeUnadornedPosting
}