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search_numeric_range.go
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search_numeric_range.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 searchers
import (
"bytes"
"math"
"github.com/blevesearch/bleve/index"
"github.com/blevesearch/bleve/numeric_util"
"github.com/blevesearch/bleve/search"
)
type NumericRangeSearcher struct {
indexReader index.IndexReader
min *float64
max *float64
field string
explain bool
searcher *DisjunctionSearcher
}
func NewNumericRangeSearcher(indexReader index.IndexReader, min *float64, max *float64, inclusiveMin, inclusiveMax *bool, field string, boost float64, explain bool) (*NumericRangeSearcher, error) {
// account for unbounded edges
if min == nil {
negInf := math.Inf(-1)
min = &negInf
}
if max == nil {
Inf := math.Inf(1)
max = &Inf
}
if inclusiveMin == nil {
defaultInclusiveMin := true
inclusiveMin = &defaultInclusiveMin
}
if inclusiveMax == nil {
defaultInclusiveMax := false
inclusiveMax = &defaultInclusiveMax
}
// find all the ranges
minInt64 := numeric_util.Float64ToInt64(*min)
if !*inclusiveMin && minInt64 != math.MaxInt64 {
minInt64++
}
maxInt64 := numeric_util.Float64ToInt64(*max)
if !*inclusiveMax && maxInt64 != math.MinInt64 {
maxInt64--
}
// FIXME hard-coded precision, should match field declaration
termRanges := splitInt64Range(minInt64, maxInt64, 4)
terms := termRanges.Enumerate()
// enumerate all the terms in the range
qsearchers := make([]search.Searcher, len(terms))
for i, term := range terms {
var err error
qsearchers[i], err = NewTermSearcher(indexReader, string(term), field, 1.0, explain)
if err != nil {
return nil, err
}
}
// build disjunction searcher of these ranges
searcher, err := NewDisjunctionSearcher(indexReader, qsearchers, 0, explain)
if err != nil {
return nil, err
}
return &NumericRangeSearcher{
indexReader: indexReader,
min: min,
max: max,
field: field,
explain: explain,
searcher: searcher,
}, nil
}
func (s *NumericRangeSearcher) Count() uint64 {
return s.searcher.Count()
}
func (s *NumericRangeSearcher) Weight() float64 {
return s.searcher.Weight()
}
func (s *NumericRangeSearcher) SetQueryNorm(qnorm float64) {
s.searcher.SetQueryNorm(qnorm)
}
func (s *NumericRangeSearcher) Next() (*search.DocumentMatch, error) {
return s.searcher.Next()
}
func (s *NumericRangeSearcher) Advance(ID string) (*search.DocumentMatch, error) {
return s.searcher.Advance(ID)
}
func (s *NumericRangeSearcher) Close() error {
return s.searcher.Close()
}
type termRange struct {
startTerm []byte
endTerm []byte
}
func (t *termRange) Enumerate() [][]byte {
rv := make([][]byte, 0)
next := t.startTerm
for bytes.Compare(next, t.endTerm) <= 0 {
rv = append(rv, next)
next = incrementBytes(next)
}
return rv
}
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 {
// didnt' overflow, so stop
break
}
}
return rv
}
type termRanges []*termRange
func (tr termRanges) Enumerate() [][]byte {
rv := make([][]byte, 0)
for _, tri := range tr {
trie := tri.Enumerate()
rv = append(rv, trie...)
}
return rv
}
func splitInt64Range(minBound, maxBound int64, precisionStep uint) termRanges {
rv := make(termRanges, 0)
if minBound > maxBound {
return rv
}
for shift := uint(0); ; shift += precisionStep {
diff := int64(1) << (shift + precisionStep)
mask := ((int64(1) << precisionStep) - int64(1)) << shift
hasLower := (minBound & mask) != int64(0)
hasUpper := (maxBound & mask) != mask
var nextMinBound int64
if hasLower {
nextMinBound = (minBound + diff) &^ mask
} else {
nextMinBound = minBound &^ mask
}
var nextMaxBound int64
if hasUpper {
nextMaxBound = (maxBound - diff) &^ mask
} else {
nextMaxBound = maxBound &^ mask
}
lowerWrapped := nextMinBound < minBound
upperWrapped := nextMaxBound > maxBound
if shift+precisionStep >= 64 || nextMinBound > nextMaxBound || lowerWrapped || upperWrapped {
// We are in the lowest precision or the next precision is not available.
rv = append(rv, newRange(minBound, maxBound, shift))
// exit the split recursion loop
break
}
if hasLower {
rv = append(rv, newRange(minBound, minBound|mask, shift))
}
if hasUpper {
rv = append(rv, newRange(maxBound&^mask, maxBound, shift))
}
// recurse to next precision
minBound = nextMinBound
maxBound = nextMaxBound
}
return rv
}
func newRange(minBound, maxBound int64, shift uint) *termRange {
maxBound |= (int64(1) << shift) - int64(1)
minBytes := numeric_util.MustNewPrefixCodedInt64(minBound, shift)
maxBytes := numeric_util.MustNewPrefixCodedInt64(maxBound, shift)
return newRangeBytes(minBytes, maxBytes)
}
func newRangeBytes(minBytes, maxBytes []byte) *termRange {
return &termRange{
startTerm: minBytes,
endTerm: maxBytes,
}
}
func (s *NumericRangeSearcher) Min() int {
return 0
}