forked from blevesearch/bleve
/
search_geoboundingbox.go
254 lines (221 loc) · 6.95 KB
/
search_geoboundingbox.go
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// Copyright (c) 2017 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 searcher
import (
"github.com/blevesearch/bleve/document"
"github.com/blevesearch/bleve/geo"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/numeric"
"github.com/blevesearch/bleve/search"
)
type filterFunc func(key []byte) bool
var GeoBitsShift1 = (geo.GeoBits << 1)
var GeoBitsShift1Minus1 = GeoBitsShift1 - 1
func NewGeoBoundingBoxSearcher(indexReader index.IndexReader, minLon, minLat,
maxLon, maxLat float64, field string, boost float64,
options search.SearcherOptions, checkBoundaries bool) (
search.Searcher, error) {
// track list of opened searchers, for cleanup on early exit
var openedSearchers []search.Searcher
cleanupOpenedSearchers := func() {
for _, s := range openedSearchers {
_ = s.Close()
}
}
// do math to produce list of terms needed for this search
onBoundaryTerms, notOnBoundaryTerms, err := ComputeGeoRange(0, GeoBitsShift1Minus1,
minLon, minLat, maxLon, maxLat, checkBoundaries, indexReader, field)
if err != nil {
return nil, err
}
var onBoundarySearcher search.Searcher
dvReader, err := indexReader.DocValueReader([]string{field})
if err != nil {
return nil, err
}
if len(onBoundaryTerms) > 0 {
rawOnBoundarySearcher, err := NewMultiTermSearcherBytes(indexReader,
onBoundaryTerms, field, boost, options, false)
if err != nil {
return nil, err
}
// add filter to check points near the boundary
onBoundarySearcher = NewFilteringSearcher(rawOnBoundarySearcher,
buildRectFilter(dvReader, field, minLon, minLat, maxLon, maxLat))
openedSearchers = append(openedSearchers, onBoundarySearcher)
}
var notOnBoundarySearcher search.Searcher
if len(notOnBoundaryTerms) > 0 {
var err error
notOnBoundarySearcher, err = NewMultiTermSearcherBytes(indexReader,
notOnBoundaryTerms, field, boost, options, false)
if err != nil {
cleanupOpenedSearchers()
return nil, err
}
openedSearchers = append(openedSearchers, notOnBoundarySearcher)
}
if onBoundarySearcher != nil && notOnBoundarySearcher != nil {
rv, err := NewDisjunctionSearcher(indexReader,
[]search.Searcher{
onBoundarySearcher,
notOnBoundarySearcher,
},
0, options)
if err != nil {
cleanupOpenedSearchers()
return nil, err
}
return rv, nil
} else if onBoundarySearcher != nil {
return onBoundarySearcher, nil
} else if notOnBoundarySearcher != nil {
return notOnBoundarySearcher, nil
}
return NewMatchNoneSearcher(indexReader)
}
var geoMaxShift = document.GeoPrecisionStep * 4
var geoDetailLevel = ((geo.GeoBits << 1) - geoMaxShift) / 2
func ComputeGeoRange(term uint64, shift uint,
sminLon, sminLat, smaxLon, smaxLat float64, checkBoundaries bool,
indexReader index.IndexReader, field string) (
onBoundary [][]byte, notOnBoundary [][]byte, err error) {
preallocBytesLen := 32
preallocBytes := make([]byte, preallocBytesLen)
makePrefixCoded := func(in int64, shift uint) (rv numeric.PrefixCoded) {
if len(preallocBytes) <= 0 {
preallocBytesLen = preallocBytesLen * 2
preallocBytes = make([]byte, preallocBytesLen)
}
rv, preallocBytes, err =
numeric.NewPrefixCodedInt64Prealloc(in, shift, preallocBytes)
return rv
}
var fieldDict index.FieldDictContains
var isIndexed filterFunc
if irr, ok := indexReader.(index.IndexReaderContains); ok {
fieldDict, err = irr.FieldDictContains(field)
if err != nil {
return nil, nil, err
}
isIndexed = func(term []byte) bool {
found, err := fieldDict.Contains(term)
return err == nil && found
}
}
defer func() {
if fieldDict != nil {
if fd, ok := fieldDict.(index.FieldDict); ok {
cerr := fd.Close()
if cerr != nil {
err = cerr
}
}
}
}()
if isIndexed == nil {
isIndexed = func(term []byte) bool {
if indexReader != nil {
reader, err := indexReader.TermFieldReader(term, field, false, false, false)
if err != nil || reader == nil {
return false
}
if reader.Count() == 0 {
_ = reader.Close()
return false
}
_ = reader.Close()
}
return true
}
}
var computeGeoRange func(term uint64, shift uint) // declare for recursion
relateAndRecurse := func(start, end uint64, res, level uint) {
minLon := geo.MortonUnhashLon(start)
minLat := geo.MortonUnhashLat(start)
maxLon := geo.MortonUnhashLon(end)
maxLat := geo.MortonUnhashLat(end)
within := res%document.GeoPrecisionStep == 0 &&
geo.RectWithin(minLon, minLat, maxLon, maxLat,
sminLon, sminLat, smaxLon, smaxLat)
if within || (level == geoDetailLevel &&
geo.RectIntersects(minLon, minLat, maxLon, maxLat,
sminLon, sminLat, smaxLon, smaxLat)) {
codedTerm := makePrefixCoded(int64(start), res)
if isIndexed(codedTerm) {
if !within && checkBoundaries {
onBoundary = append(onBoundary, codedTerm)
} else {
notOnBoundary = append(notOnBoundary, codedTerm)
}
}
} else if level < geoDetailLevel &&
geo.RectIntersects(minLon, minLat, maxLon, maxLat,
sminLon, sminLat, smaxLon, smaxLat) {
computeGeoRange(start, res-1)
}
}
computeGeoRange = func(term uint64, shift uint) {
if err != nil {
return
}
split := term | uint64(0x1)<<shift
var upperMax uint64
if shift < 63 {
upperMax = term | ((uint64(1) << (shift + 1)) - 1)
} else {
upperMax = 0xffffffffffffffff
}
lowerMax := split - 1
level := (GeoBitsShift1 - shift) >> 1
relateAndRecurse(term, lowerMax, shift, level)
relateAndRecurse(split, upperMax, shift, level)
}
computeGeoRange(term, shift)
if err != nil {
return nil, nil, err
}
return onBoundary, notOnBoundary, err
}
func buildRectFilter(dvReader index.DocValueReader, field string,
minLon, minLat, maxLon, maxLat float64) FilterFunc {
return func(d *search.DocumentMatch) bool {
// check geo matches against all numeric type terms indexed
var lons, lats []float64
var found bool
err := dvReader.VisitDocValues(d.IndexInternalID, func(field string, term []byte) {
// only consider the values which are shifted 0
prefixCoded := numeric.PrefixCoded(term)
shift, err := prefixCoded.Shift()
if err == nil && shift == 0 {
var i64 int64
i64, err = prefixCoded.Int64()
if err == nil {
lons = append(lons, geo.MortonUnhashLon(uint64(i64)))
lats = append(lats, geo.MortonUnhashLat(uint64(i64)))
found = true
}
}
})
if err == nil && found {
for i := range lons {
if geo.BoundingBoxContains(lons[i], lats[i],
minLon, minLat, maxLon, maxLat) {
return true
}
}
}
return false
}
}