/
dataframe.go
211 lines (190 loc) · 4.17 KB
/
dataframe.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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
package dataframe
import (
"fmt"
"sort"
"strings"
"time"
)
// FieldType is used to describe the type of data in a field.
type FieldType int
// All valid field types.
const (
FieldTypeOther FieldType = iota
FieldTypeTime
FieldTypeNumber
FieldTypeString
FieldTypeBoolean
)
func (f FieldType) String() string {
switch f {
case FieldTypeOther:
return "other"
case FieldTypeNumber:
return "number"
case FieldTypeString:
return "string"
case FieldTypeBoolean:
return "boolean"
case FieldTypeTime:
return "time"
default:
return "unknown"
}
}
// Field represents a column of data with a specific type.
type Field struct {
Name string
Type FieldType
Vector Vector
}
type Fields []*Field
func assertFieldType(got, want FieldType) {
if got != want {
panic(fmt.Sprintf("values doesn't match the specified field type"))
}
}
// NewField returns a new instance of Field.
func NewField(name string, fieldType FieldType, values interface{}) *Field {
var vec Vector
switch v := values.(type) {
case []*float64:
assertFieldType(fieldType, FieldTypeNumber)
vec = newVector(fieldType, len(v))
for i := 0; i < len(v); i++ {
vec.Set(i, v[i])
}
case []*int64:
assertFieldType(fieldType, FieldTypeNumber)
vec = newVector(fieldType, len(v))
for i := 0; i < len(v); i++ {
vec.Set(i, v[i])
}
case []*time.Time:
assertFieldType(fieldType, FieldTypeTime)
vec = newVector(fieldType, len(v))
for i := 0; i < len(v); i++ {
vec.Set(i, v[i])
}
case []*string:
assertFieldType(fieldType, FieldTypeString)
vec = newVector(fieldType, len(v))
for i := 0; i < len(v); i++ {
vec.Set(i, v[i])
}
case []*bool:
assertFieldType(fieldType, FieldTypeBoolean)
vec = newVector(fieldType, len(v))
for i := 0; i < len(v); i++ {
vec.Set(i, v[i])
}
case []float64:
assertFieldType(fieldType, FieldTypeNumber)
vec = newVector(fieldType, len(v))
for i := 0; i < len(v); i++ {
vec.Set(i, &v[i])
}
case []int64:
assertFieldType(fieldType, FieldTypeNumber)
vec = newVector(fieldType, len(v))
for i := 0; i < len(v); i++ {
vec.Set(i, &v[i])
}
case []time.Time:
assertFieldType(fieldType, FieldTypeTime)
vec = newVector(fieldType, len(v))
for i := 0; i < len(v); i++ {
vec.Set(i, &v[i])
}
case []string:
assertFieldType(fieldType, FieldTypeString)
vec = newVector(fieldType, len(v))
for i := 0; i < len(v); i++ {
vec.Set(i, &v[i])
}
case []bool:
assertFieldType(fieldType, FieldTypeBoolean)
vec = newVector(fieldType, len(v))
for i := 0; i < len(v); i++ {
vec.Set(i, &v[i])
}
}
return &Field{
Name: name,
Type: fieldType,
Vector: vec,
}
}
// Len returns the number of elements in the field.
func (f *Field) Len() int {
return f.Vector.Len()
}
// Labels are used to add metadata to an object.
type Labels map[string]string
// Equals returns true if the argument has the same k=v pairs as the receiver.
func (l Labels) Equals(arg Labels) bool {
if len(l) != len(arg) {
return false
}
for k, v := range l {
if argVal, ok := arg[k]; !ok || argVal != v {
return false
}
}
return true
}
// Contains returns true if all k=v pairs of the argument are in the receiver.
func (l Labels) Contains(arg Labels) bool {
if len(arg) > len(l) {
return false
}
for k, v := range arg {
if argVal, ok := l[k]; !ok || argVal != v {
return false
}
}
return true
}
func (l Labels) String() string {
// Better structure, should be sorted, copy prom probably
keys := make([]string, len(l))
i := 0
for k := range l {
keys[i] = k
i++
}
sort.Strings(keys)
var sb strings.Builder
i = 0
for _, k := range keys {
sb.WriteString(k)
sb.WriteString("=")
sb.WriteString(l[k])
if i != len(keys)-1 {
sb.WriteString(", ")
}
i++
}
return sb.String()
}
// Frame represents a columnar storage with optional labels.
type Frame struct {
Name string
Labels Labels
Fields []*Field
RefID string
}
// New returns a new instance of a Frame.
func New(name string, labels Labels, fields ...*Field) *Frame {
return &Frame{
Name: name,
Labels: labels,
Fields: fields,
}
}
// Rows returns the number of rows in the frame.
func (f *Frame) Rows() int {
if len(f.Fields) > 0 {
return f.Fields[0].Len()
}
return 0
}