158 lines
3.6 KiB
Go
158 lines
3.6 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package facet
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import (
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"reflect"
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"sort"
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"github.com/blevesearch/bleve/numeric"
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"github.com/blevesearch/bleve/search"
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"github.com/blevesearch/bleve/size"
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)
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var reflectStaticSizeNumericFacetBuilder int
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var reflectStaticSizenumericRange int
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func init() {
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var nfb NumericFacetBuilder
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reflectStaticSizeNumericFacetBuilder = int(reflect.TypeOf(nfb).Size())
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var nr numericRange
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reflectStaticSizenumericRange = int(reflect.TypeOf(nr).Size())
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}
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type numericRange struct {
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min *float64
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max *float64
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}
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type NumericFacetBuilder struct {
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size int
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field string
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termsCount map[string]int
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total int
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missing int
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ranges map[string]*numericRange
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sawValue bool
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}
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func NewNumericFacetBuilder(field string, size int) *NumericFacetBuilder {
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return &NumericFacetBuilder{
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size: size,
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field: field,
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termsCount: make(map[string]int),
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ranges: make(map[string]*numericRange, 0),
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}
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}
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func (fb *NumericFacetBuilder) Size() int {
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sizeInBytes := reflectStaticSizeNumericFacetBuilder + size.SizeOfPtr +
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len(fb.field)
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for k, _ := range fb.termsCount {
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sizeInBytes += size.SizeOfString + len(k) +
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size.SizeOfInt
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}
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for k, _ := range fb.ranges {
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sizeInBytes += size.SizeOfString + len(k) +
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size.SizeOfPtr + reflectStaticSizenumericRange
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}
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return sizeInBytes
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}
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func (fb *NumericFacetBuilder) AddRange(name string, min, max *float64) {
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r := numericRange{
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min: min,
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max: max,
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}
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fb.ranges[name] = &r
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}
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func (fb *NumericFacetBuilder) Field() string {
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return fb.field
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}
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func (fb *NumericFacetBuilder) UpdateVisitor(field string, term []byte) {
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if field == fb.field {
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fb.sawValue = true
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// only consider the values which are shifted 0
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prefixCoded := numeric.PrefixCoded(term)
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shift, err := prefixCoded.Shift()
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if err == nil && shift == 0 {
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i64, err := prefixCoded.Int64()
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if err == nil {
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f64 := numeric.Int64ToFloat64(i64)
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// look at each of the ranges for a match
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for rangeName, r := range fb.ranges {
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if (r.min == nil || f64 >= *r.min) && (r.max == nil || f64 < *r.max) {
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fb.termsCount[rangeName] = fb.termsCount[rangeName] + 1
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fb.total++
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}
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}
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}
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}
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}
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}
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func (fb *NumericFacetBuilder) StartDoc() {
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fb.sawValue = false
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}
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func (fb *NumericFacetBuilder) EndDoc() {
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if !fb.sawValue {
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fb.missing++
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}
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}
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func (fb *NumericFacetBuilder) Result() *search.FacetResult {
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rv := search.FacetResult{
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Field: fb.field,
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Total: fb.total,
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Missing: fb.missing,
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}
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rv.NumericRanges = make([]*search.NumericRangeFacet, 0, len(fb.termsCount))
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for term, count := range fb.termsCount {
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numericRange := fb.ranges[term]
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tf := &search.NumericRangeFacet{
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Name: term,
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Count: count,
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Min: numericRange.min,
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Max: numericRange.max,
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}
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rv.NumericRanges = append(rv.NumericRanges, tf)
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}
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sort.Sort(rv.NumericRanges)
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// we now have the list of the top N facets
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if fb.size < len(rv.NumericRanges) {
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rv.NumericRanges = rv.NumericRanges[:fb.size]
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}
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notOther := 0
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for _, nr := range rv.NumericRanges {
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notOther += nr.Count
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}
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rv.Other = fb.total - notOther
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return &rv
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}
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