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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"
-
- "github.com/blevesearch/bleve/numeric"
- "github.com/blevesearch/bleve/search"
- )
-
- type numericRange struct {
- min *float64
- max *float64
- }
-
- type NumericFacetBuilder struct {
- size int
- field string
- termsCount map[string]int
- total int
- missing int
- ranges map[string]*numericRange
- sawValue bool
- }
-
- func NewNumericFacetBuilder(field string, size int) *NumericFacetBuilder {
- return &NumericFacetBuilder{
- size: size,
- field: field,
- termsCount: make(map[string]int),
- ranges: make(map[string]*numericRange, 0),
- }
- }
-
- func (fb *NumericFacetBuilder) AddRange(name string, min, max *float64) {
- r := numericRange{
- min: min,
- max: max,
- }
- fb.ranges[name] = &r
- }
-
- func (fb *NumericFacetBuilder) Field() string {
- return fb.field
- }
-
- func (fb *NumericFacetBuilder) 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 {
- f64 := numeric.Int64ToFloat64(i64)
-
- // look at each of the ranges for a match
- for rangeName, r := range fb.ranges {
- if (r.min == nil || f64 >= *r.min) && (r.max == nil || f64 < *r.max) {
- fb.termsCount[rangeName] = fb.termsCount[rangeName] + 1
- fb.total++
- }
- }
- }
- }
- }
- }
-
- func (fb *NumericFacetBuilder) StartDoc() {
- fb.sawValue = false
- }
-
- func (fb *NumericFacetBuilder) EndDoc() {
- if !fb.sawValue {
- fb.missing++
- }
- }
-
- func (fb *NumericFacetBuilder) Result() *search.FacetResult {
- rv := search.FacetResult{
- Field: fb.field,
- Total: fb.total,
- Missing: fb.missing,
- }
-
- rv.NumericRanges = make([]*search.NumericRangeFacet, 0, len(fb.termsCount))
-
- for term, count := range fb.termsCount {
- numericRange := fb.ranges[term]
- tf := &search.NumericRangeFacet{
- Name: term,
- Count: count,
- Min: numericRange.min,
- Max: numericRange.max,
- }
-
- rv.NumericRanges = append(rv.NumericRanges, tf)
- }
-
- sort.Sort(rv.NumericRanges)
-
- // we now have the list of the top N facets
- if fb.size < len(rv.NumericRanges) {
- rv.NumericRanges = rv.NumericRanges[:fb.size]
- }
-
- notOther := 0
- for _, nr := range rv.NumericRanges {
- notOther += nr.Count
- }
- rv.Other = fb.total - notOther
-
- return &rv
- }
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