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- // 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
- }
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