-
Notifications
You must be signed in to change notification settings - Fork 121
/
metric.go
173 lines (146 loc) · 3.72 KB
/
metric.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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
// Copyright (c) 2020 The Bluge Authors.
//
// 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 aggregations
import (
"math"
"github.com/blugelabs/bluge/search"
)
type SingleValueMetric struct {
src search.NumericValuesSource
init float64
compute SingleValueCalculatorFunc
}
func Sum(src search.NumericValuesSource) *SingleValueMetric {
return &SingleValueMetric{
src: src,
compute: func(s *SingleValueCalculator, val float64) {
s.val += val
},
}
}
func Min(src search.NumericValuesSource) *SingleValueMetric {
return &SingleValueMetric{
init: math.Inf(1),
src: src,
compute: func(s *SingleValueCalculator, val float64) {
if val < s.val {
s.val = val
}
},
}
}
func Max(src search.NumericValuesSource) *SingleValueMetric {
return MaxStartingAt(src, math.Inf(-1))
}
func MaxStartingAt(src search.NumericValuesSource, initial float64) *SingleValueMetric {
return &SingleValueMetric{
init: initial,
src: src,
compute: func(s *SingleValueCalculator, val float64) {
if val > s.val {
s.val = val
}
},
}
}
func (s *SingleValueMetric) Fields() []string {
return s.src.Fields()
}
func (s *SingleValueMetric) Calculator() search.Calculator {
rv := &SingleValueCalculator{
val: s.init,
src: s.src,
compute: s.compute,
}
return rv
}
type SingleValueCalculatorFunc func(*SingleValueCalculator, float64)
type SingleValueCalculator struct {
src search.NumericValuesSource
val float64
compute SingleValueCalculatorFunc
}
func (s *SingleValueCalculator) Consume(d *search.DocumentMatch) {
for _, val := range s.src.Numbers(d) {
s.compute(s, val)
}
}
func (s *SingleValueCalculator) Merge(other search.Calculator) {
if other, ok := other.(*SingleValueCalculator); ok {
s.compute(s, other.val)
}
}
func (s *SingleValueCalculator) Finish() {}
func (s *SingleValueCalculator) Value() float64 {
return s.val
}
type WeightedAvgMetric struct {
src search.NumericValuesSource
weight search.NumericValuesSource
}
func Avg(src search.NumericValuesSource) *WeightedAvgMetric {
return &WeightedAvgMetric{
src: src,
}
}
func WeightedAvg(src, weight search.NumericValuesSource) *WeightedAvgMetric {
return &WeightedAvgMetric{
src: src,
weight: weight,
}
}
func (a *WeightedAvgMetric) Fields() []string {
rv := a.src.Fields()
if a.weight != nil {
rv = append(rv, a.weight.Fields()...)
}
return rv
}
func (a *WeightedAvgMetric) Calculator() search.Calculator {
rv := &WeightedAvgCalculator{
src: a.src,
weight: a.weight,
}
return rv
}
type WeightedAvgCalculator struct {
src search.NumericValuesSource
weight search.NumericValuesSource
val float64
weights float64
}
func (a *WeightedAvgCalculator) Value() float64 {
return a.val / a.weights
}
func (a *WeightedAvgCalculator) Consume(d *search.DocumentMatch) {
weight := 1.0
if a.weight != nil {
weightValues := a.weight.Numbers(d)
if len(weightValues) > 0 {
weight = weightValues[0]
}
}
for _, val := range a.src.Numbers(d) {
a.val += val * weight
a.weights += weight
}
}
func (a *WeightedAvgCalculator) Merge(other search.Calculator) {
if other, ok := other.(*WeightedAvgCalculator); ok {
a.val += other.val
a.weights += other.weights
}
}
func (a *WeightedAvgCalculator) Finish() {
}