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
|
// 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 (
"sort"
"time"
"github.com/blevesearch/bleve/numeric"
"github.com/blevesearch/bleve/search"
)
type dateTimeRange struct {
start time.Time
end time.Time
}
type DateTimeFacetBuilder struct {
size int
field string
termsCount map[string]int
total int
missing int
ranges map[string]*dateTimeRange
sawValue bool
}
func NewDateTimeFacetBuilder(field string, size int) *DateTimeFacetBuilder {
return &DateTimeFacetBuilder{
size: size,
field: field,
termsCount: make(map[string]int),
ranges: make(map[string]*dateTimeRange, 0),
}
}
func (fb *DateTimeFacetBuilder) AddRange(name string, start, end time.Time) {
r := dateTimeRange{
start: start,
end: end,
}
fb.ranges[name] = &r
}
func (fb *DateTimeFacetBuilder) Field() string {
return fb.field
}
func (fb *DateTimeFacetBuilder) 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 {
t := time.Unix(0, i64)
// look at each of the ranges for a match
for rangeName, r := range fb.ranges {
if (r.start.IsZero() || t.After(r.start) || t.Equal(r.start)) && (r.end.IsZero() || t.Before(r.end)) {
fb.termsCount[rangeName] = fb.termsCount[rangeName] + 1
fb.total++
}
}
}
}
}
}
func (fb *DateTimeFacetBuilder) StartDoc() {
fb.sawValue = false
}
func (fb *DateTimeFacetBuilder) EndDoc() {
if !fb.sawValue {
fb.missing++
}
}
func (fb *DateTimeFacetBuilder) Result() *search.FacetResult {
rv := search.FacetResult{
Field: fb.field,
Total: fb.total,
Missing: fb.missing,
}
rv.DateRanges = make([]*search.DateRangeFacet, 0, len(fb.termsCount))
for term, count := range fb.termsCount {
dateRange := fb.ranges[term]
tf := &search.DateRangeFacet{
Name: term,
Count: count,
}
if !dateRange.start.IsZero() {
start := dateRange.start.Format(time.RFC3339Nano)
tf.Start = &start
}
if !dateRange.end.IsZero() {
end := dateRange.end.Format(time.RFC3339Nano)
tf.End = &end
}
rv.DateRanges = append(rv.DateRanges, tf)
}
sort.Sort(rv.DateRanges)
// we now have the list of the top N facets
if fb.size < len(rv.DateRanges) {
rv.DateRanges = rv.DateRanges[:fb.size]
}
notOther := 0
for _, nr := range rv.DateRanges {
notOther += nr.Count
}
rv.Other = fb.total - notOther
return &rv
}
|
