1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42
43. 43
44. 44
45. 45
46. 46
47. 47
48. 48
49. 49
50. 50
51. 51
52. 52
53. 53
54. 54
55. 55
56. 56
57. 57
58. 58
59. 59
60. 60
61. 61
62. 62
63. 63
64. 64
65. 65
66. 66
67. 67
68. 68
69. 69
70. 70
71. 71
72. 72
73. 73
74. 74
75. 75
76. 76
77. 77
78. 78
79. 79
80. 80
81. 81
82. 82
83. 83
84. 84
85. 85
86. 86
87. 87
88. 88
89. 89
90. 90
91. 91
92. 92
93. 93
94. 94
95. 95
96. 96
97. 97
98. 98
99. 99
100. 100
101. 101
102. 102
103. 103
104. 104
105. 105
106. 106
107. 107
108. 108
109. 109
110. 110
111. 111
112. 112
113. 113
114. 114
115. 115
116. 116
117. 117
118. 118
119. 119
120. 120
121. 121
122. 122
123. 123
124. 124
125. 125
126. 126
127. 127
128. 128
129. 129
130. 130
131. 131
132. 132
133. 133
134. 134
135. 135
136. 136
137. 137
138. 138
139. 139
140. 140
141. 141
142. 142
143. 143
144. 144
145. 145
146. 146
147. 147
148. 148
149. 149
150. 150
151. 151
152. 152
153. 153
154. 154
155. 155
156. 156
157. 157
158. 158
159. 159

//  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 document

import (
	"fmt"
	"reflect"

	"github.com/blevesearch/bleve/v2/analysis"
	"github.com/blevesearch/bleve/v2/numeric"
	"github.com/blevesearch/bleve/v2/size"
	index "github.com/blevesearch/bleve_index_api"
)

var reflectStaticSizeNumericField int

func init() {
	var f NumericField
	reflectStaticSizeNumericField = int(reflect.TypeOf(f).Size())
}

const DefaultNumericIndexingOptions = index.StoreField | index.IndexField | index.DocValues

const DefaultPrecisionStep uint = 4

type NumericField struct {
	name              string
	arrayPositions    []uint64
	options           index.FieldIndexingOptions
	value             numeric.PrefixCoded
	numPlainTextBytes uint64
	length            int
	frequencies       index.TokenFrequencies
}

func (n *NumericField) Size() int {
	return reflectStaticSizeNumericField + size.SizeOfPtr +
		len(n.name) +
		len(n.arrayPositions)*size.SizeOfPtr
}

func (n *NumericField) Name() string {
	return n.name
}

func (n *NumericField) ArrayPositions() []uint64 {
	return n.arrayPositions
}

func (n *NumericField) Options() index.FieldIndexingOptions {
	return n.options
}

func (n *NumericField) EncodedFieldType() byte {
	return 'n'
}

func (n *NumericField) AnalyzedLength() int {
	return n.length
}

func (n *NumericField) AnalyzedTokenFrequencies() index.TokenFrequencies {
	return n.frequencies
}

func (n *NumericField) Analyze() {
	tokens := make(analysis.TokenStream, 0)
	tokens = append(tokens, &analysis.Token{
		Start:    0,
		End:      len(n.value),
		Term:     n.value,
		Position: 1,
		Type:     analysis.Numeric,
	})

	original, err := n.value.Int64()
	if err == nil {

		shift := DefaultPrecisionStep
		for shift < 64 {
			shiftEncoded, err := numeric.NewPrefixCodedInt64(original, shift)
			if err != nil {
				break
			}
			token := analysis.Token{
				Start:    0,
				End:      len(shiftEncoded),
				Term:     shiftEncoded,
				Position: 1,
				Type:     analysis.Numeric,
			}
			tokens = append(tokens, &token)
			shift += DefaultPrecisionStep
		}
	}

	n.length = len(tokens)
	n.frequencies = analysis.TokenFrequency(tokens, n.arrayPositions, n.options)
}

func (n *NumericField) Value() []byte {
	return n.value
}

func (n *NumericField) Number() (float64, error) {
	i64, err := n.value.Int64()
	if err != nil {
		return 0.0, err
	}
	return numeric.Int64ToFloat64(i64), nil
}

func (n *NumericField) GoString() string {
	return fmt.Sprintf("&document.NumericField{Name:%s, Options: %s, Value: %s}", n.name, n.options, n.value)
}

func (n *NumericField) NumPlainTextBytes() uint64 {
	return n.numPlainTextBytes
}

func NewNumericFieldFromBytes(name string, arrayPositions []uint64, value []byte) *NumericField {
	return &NumericField{
		name:              name,
		arrayPositions:    arrayPositions,
		value:             value,
		options:           DefaultNumericIndexingOptions,
		numPlainTextBytes: uint64(len(value)),
	}
}

func NewNumericField(name string, arrayPositions []uint64, number float64) *NumericField {
	return NewNumericFieldWithIndexingOptions(name, arrayPositions, number, DefaultNumericIndexingOptions)
}

func NewNumericFieldWithIndexingOptions(name string, arrayPositions []uint64, number float64, options index.FieldIndexingOptions) *NumericField {
	numberInt64 := numeric.Float64ToInt64(number)
	prefixCoded := numeric.MustNewPrefixCodedInt64(numberInt64, 0)
	return &NumericField{
		name:           name,
		arrayPositions: arrayPositions,
		value:          prefixCoded,
		options:        options,
		// not correct, just a place holder until we revisit how fields are
		// represented and can fix this better
		numPlainTextBytes: uint64(8),
	}
}