2ee7289bc8
this started initially to relocate highlighting into a self contained package, which would then also use the registry however, it turned into a much larger refactor in order to avoid cyclic imports now facets, searchers, scorers and collectors are also broken out into subpackages of search
214 lines
5.3 KiB
Go
214 lines
5.3 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package searchers
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import (
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"bytes"
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"math"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/numeric_util"
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"github.com/blevesearch/bleve/search"
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)
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type NumericRangeSearcher struct {
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index index.Index
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min *float64
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max *float64
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field string
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explain bool
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searcher *DisjunctionSearcher
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}
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func NewNumericRangeSearcher(index index.Index, min *float64, max *float64, inclusiveMin, inclusiveMax *bool, field string, boost float64, explain bool) (*NumericRangeSearcher, error) {
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// account for unbounded edges
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if min == nil {
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negInf := math.Inf(-1)
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min = &negInf
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}
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if max == nil {
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Inf := math.Inf(1)
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max = &Inf
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}
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if inclusiveMin == nil {
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defaultInclusiveMin := true
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inclusiveMin = &defaultInclusiveMin
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}
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if inclusiveMax == nil {
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defaultInclusiveMax := false
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inclusiveMax = &defaultInclusiveMax
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}
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// find all the ranges
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minInt64 := numeric_util.Float64ToInt64(*min)
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if !*inclusiveMin && minInt64 != math.MaxInt64 {
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minInt64 += 1
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}
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maxInt64 := numeric_util.Float64ToInt64(*max)
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if !*inclusiveMax && maxInt64 != math.MinInt64 {
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maxInt64 -= 1
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}
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// FIXME hard-coded precion, should match field declaration
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termRanges := splitInt64Range(minInt64, maxInt64, 4)
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terms := termRanges.Enumerate()
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// enumerate all the terms in the range
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qsearchers := make([]search.Searcher, len(terms))
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for i, term := range terms {
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var err error
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qsearchers[i], err = NewTermSearcher(index, string(term), field, 1.0, explain)
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if err != nil {
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return nil, err
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}
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}
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// build disjunction searcher of these ranges
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searcher, err := NewDisjunctionSearcher(index, qsearchers, 0, explain)
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if err != nil {
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return nil, err
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}
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return &NumericRangeSearcher{
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index: index,
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min: min,
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max: max,
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field: field,
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explain: explain,
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searcher: searcher,
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}, nil
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}
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func (s *NumericRangeSearcher) Count() uint64 {
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return s.searcher.Count()
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}
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func (s *NumericRangeSearcher) Weight() float64 {
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return s.searcher.Weight()
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}
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func (s *NumericRangeSearcher) SetQueryNorm(qnorm float64) {
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s.searcher.SetQueryNorm(qnorm)
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}
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func (s *NumericRangeSearcher) Next() (*search.DocumentMatch, error) {
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return s.searcher.Next()
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}
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func (s *NumericRangeSearcher) Advance(ID string) (*search.DocumentMatch, error) {
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return s.searcher.Advance(ID)
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}
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func (s *NumericRangeSearcher) Close() {
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s.searcher.Close()
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}
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type termRange struct {
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startTerm []byte
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endTerm []byte
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}
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func (t *termRange) Enumerate() [][]byte {
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rv := make([][]byte, 0)
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next := t.startTerm
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for bytes.Compare(next, t.endTerm) <= 0 {
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rv = append(rv, next)
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next = incrementBytes(next)
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}
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return rv
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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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// didnt' 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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type termRanges []*termRange
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func (tr termRanges) Enumerate() [][]byte {
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rv := make([][]byte, 0)
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for _, tri := range tr {
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trie := tri.Enumerate()
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rv = append(rv, trie...)
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}
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return rv
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}
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func splitInt64Range(minBound, maxBound int64, precisionStep uint) termRanges {
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rv := make(termRanges, 0)
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if minBound > maxBound {
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return rv
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}
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for shift := uint(0); ; shift += precisionStep {
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diff := int64(1) << (shift + precisionStep)
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mask := ((int64(1) << precisionStep) - int64(1)) << shift
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hasLower := (minBound & mask) != int64(0)
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hasUpper := (maxBound & mask) != mask
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var nextMinBound int64
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if hasLower {
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nextMinBound = (minBound + diff) &^ mask
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} else {
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nextMinBound = minBound &^ mask
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}
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var nextMaxBound int64
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if hasUpper {
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nextMaxBound = (maxBound - diff) &^ mask
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} else {
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nextMaxBound = maxBound &^ mask
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}
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lowerWrapped := nextMinBound < minBound
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upperWrapped := nextMaxBound > maxBound
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if shift+precisionStep >= 64 || nextMinBound > nextMaxBound || lowerWrapped || upperWrapped {
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// We are in the lowest precision or the next precision is not available.
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rv = append(rv, newRange(minBound, maxBound, shift))
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// exit the split recursion loop
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break
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}
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if hasLower {
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rv = append(rv, newRange(minBound, minBound|mask, shift))
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}
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if hasUpper {
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rv = append(rv, newRange(maxBound&^mask, maxBound, shift))
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}
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// recurse to next precision
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minBound = nextMinBound
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maxBound = nextMaxBound
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}
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return rv
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}
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func newRange(minBound, maxBound int64, shift uint) *termRange {
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maxBound |= (int64(1) << shift) - int64(1)
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minBytes := numeric_util.MustNewPrefixCodedInt64(minBound, shift)
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maxBytes := numeric_util.MustNewPrefixCodedInt64(maxBound, shift)
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return newRangeBytes(minBytes, maxBytes)
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}
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func newRangeBytes(minBytes, maxBytes []byte) *termRange {
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return &termRange{
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startTerm: minBytes,
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endTerm: maxBytes,
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}
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}
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func (s *NumericRangeSearcher) Min() int {
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return 0
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}
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