/
facet_builder_numeric.go
157 lines (131 loc) · 3.63 KB
/
facet_builder_numeric.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
// 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 facet
import (
"reflect"
"sort"
"github.com/blevesearch/bleve/numeric"
"github.com/blevesearch/bleve/search"
"github.com/blevesearch/bleve/size"
)
var reflectStaticSizeNumericFacetBuilder int
var reflectStaticSizenumericRange int
func init() {
var nfb NumericFacetBuilder
reflectStaticSizeNumericFacetBuilder = int(reflect.TypeOf(nfb).Size())
var nr numericRange
reflectStaticSizenumericRange = int(reflect.TypeOf(nr).Size())
}
type numericRange struct {
min *float64
max *float64
}
type NumericFacetBuilder struct {
size int
field string
termsCount map[string]int
total int
missing int
ranges map[string]*numericRange
sawValue bool
}
func NewNumericFacetBuilder(field string, size int) *NumericFacetBuilder {
return &NumericFacetBuilder{
size: size,
field: field,
termsCount: make(map[string]int),
ranges: make(map[string]*numericRange, 0),
}
}
func (fb *NumericFacetBuilder) Size() int {
sizeInBytes := reflectStaticSizeNumericFacetBuilder + size.SizeOfPtr +
len(fb.field)
for k, _ := range fb.termsCount {
sizeInBytes += size.SizeOfString + len(k) +
size.SizeOfInt
}
for k, _ := range fb.ranges {
sizeInBytes += size.SizeOfString + len(k) +
size.SizeOfPtr + reflectStaticSizenumericRange
}
return sizeInBytes
}
func (fb *NumericFacetBuilder) AddRange(name string, min, max *float64) {
r := numericRange{
min: min,
max: max,
}
fb.ranges[name] = &r
}
func (fb *NumericFacetBuilder) Field() string {
return fb.field
}
func (fb *NumericFacetBuilder) UpdateVisitor(field string, term []byte) {
if field == fb.field {
fb.sawValue = true
// only consider the values which are shifted 0
prefixCoded := numeric.PrefixCoded(term)
shift, err := prefixCoded.Shift()
if err == nil && shift == 0 {
i64, err := prefixCoded.Int64()
if err == nil {
f64 := numeric.Int64ToFloat64(i64)
// look at each of the ranges for a match
for rangeName, r := range fb.ranges {
if (r.min == nil || f64 >= *r.min) && (r.max == nil || f64 < *r.max) {
fb.termsCount[rangeName] = fb.termsCount[rangeName] + 1
fb.total++
}
}
}
}
}
}
func (fb *NumericFacetBuilder) StartDoc() {
fb.sawValue = false
}
func (fb *NumericFacetBuilder) EndDoc() {
if !fb.sawValue {
fb.missing++
}
}
func (fb *NumericFacetBuilder) Result() *search.FacetResult {
rv := search.FacetResult{
Field: fb.field,
Total: fb.total,
Missing: fb.missing,
}
rv.NumericRanges = make([]*search.NumericRangeFacet, 0, len(fb.termsCount))
for term, count := range fb.termsCount {
numericRange := fb.ranges[term]
tf := &search.NumericRangeFacet{
Name: term,
Count: count,
Min: numericRange.min,
Max: numericRange.max,
}
rv.NumericRanges = append(rv.NumericRanges, tf)
}
sort.Sort(rv.NumericRanges)
// we now have the list of the top N facets
if fb.size < len(rv.NumericRanges) {
rv.NumericRanges = rv.NumericRanges[:fb.size]
}
notOther := 0
for _, nr := range rv.NumericRanges {
notOther += nr.Count
}
rv.Other = fb.total - notOther
return &rv
}