51a59cb05c
an IndexAlias allows you easily work with one logical Index while changing the actual Index its pointing to behind the scenes Changing which actual Index is backing an IndexAlias can be done atomically so that your application smoothly transitions from one Index to another. A separate use of IndexAlias is allowed when the IndexAlias is defined to point to multiple Indexes. In this case only the Search() operation is supported, but the Search will be run on each of the underlying indexes in parallel, and the results will be merged.
213 lines
5.9 KiB
Go
213 lines
5.9 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package search
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import (
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"sort"
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"github.com/blevesearch/bleve/index"
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)
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type FacetBuilder interface {
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Update(index.FieldTerms)
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Result() *FacetResult
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}
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type FacetsBuilder struct {
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indexReader index.IndexReader
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facets map[string]FacetBuilder
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}
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func NewFacetsBuilder(indexReader index.IndexReader) *FacetsBuilder {
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return &FacetsBuilder{
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indexReader: indexReader,
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facets: make(map[string]FacetBuilder, 0),
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}
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}
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func (fb *FacetsBuilder) Add(name string, facetBuilder FacetBuilder) {
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fb.facets[name] = facetBuilder
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}
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func (fb *FacetsBuilder) Update(docMatch *DocumentMatch) error {
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fieldTerms, err := fb.indexReader.DocumentFieldTerms(docMatch.ID)
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if err != nil {
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return err
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}
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for _, facetBuilder := range fb.facets {
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facetBuilder.Update(fieldTerms)
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}
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return nil
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}
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type TermFacet struct {
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Term string `json:"term"`
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Count int `json:"count"`
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}
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type TermFacets []*TermFacet
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func (tf TermFacets) Add(termFacet *TermFacet) TermFacets {
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for _, existingTerm := range tf {
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if termFacet.Term == existingTerm.Term {
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existingTerm.Count += termFacet.Count
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return tf
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}
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}
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// if we got here it wasn't already in the existing terms
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tf = append(tf, termFacet)
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return tf
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}
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func (tf TermFacets) Len() int { return len(tf) }
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func (tf TermFacets) Swap(i, j int) { tf[i], tf[j] = tf[j], tf[i] }
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func (tf TermFacets) Less(i, j int) bool { return tf[i].Count > tf[j].Count }
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type NumericRangeFacet struct {
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Name string `json:"name"`
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Min *float64 `json:"min,omitempty"`
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Max *float64 `json:"max,omitempty"`
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Count int `json:"count"`
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}
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type NumericRangeFacets []*NumericRangeFacet
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func (nrf NumericRangeFacets) Add(numericRangeFacet *NumericRangeFacet) NumericRangeFacets {
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for _, existingNr := range nrf {
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if numericRangeFacet.Min == existingNr.Min && numericRangeFacet.Max == existingNr.Max {
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existingNr.Count += numericRangeFacet.Count
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return nrf
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}
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}
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// if we got here it wasn't already in the existing terms
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nrf = append(nrf, numericRangeFacet)
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return nrf
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}
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func (nrf NumericRangeFacets) Len() int { return len(nrf) }
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func (nrf NumericRangeFacets) Swap(i, j int) { nrf[i], nrf[j] = nrf[j], nrf[i] }
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func (nrf NumericRangeFacets) Less(i, j int) bool { return nrf[i].Count > nrf[j].Count }
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type DateRangeFacet struct {
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Name string `json:"name"`
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Start *string `json:"start,omitempty"`
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End *string `json:"end,omitempty"`
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Count int `json:"count"`
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}
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type DateRangeFacets []*DateRangeFacet
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func (drf DateRangeFacets) Add(dateRangeFacet *DateRangeFacet) DateRangeFacets {
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for _, existingDr := range drf {
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if dateRangeFacet.Start == existingDr.Start && dateRangeFacet.End == existingDr.End {
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existingDr.Count += dateRangeFacet.Count
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return drf
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}
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}
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// if we got here it wasn't already in the existing terms
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drf = append(drf, dateRangeFacet)
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return drf
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}
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func (drf DateRangeFacets) Len() int { return len(drf) }
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func (drf DateRangeFacets) Swap(i, j int) { drf[i], drf[j] = drf[j], drf[i] }
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func (drf DateRangeFacets) Less(i, j int) bool { return drf[i].Count > drf[j].Count }
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type FacetResult struct {
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Field string `json:"field"`
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Total int `json:"total"`
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Missing int `json:"missing"`
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Other int `json:"other"`
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Terms TermFacets `json:"terms,omitempty"`
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NumericRanges NumericRangeFacets `json:"numeric_ranges,omitempty"`
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DateRanges DateRangeFacets `json:"date_ranges,omitempty"`
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}
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func (fr *FacetResult) Merge(other *FacetResult) {
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fr.Total += other.Total
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fr.Missing += other.Missing
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fr.Other += other.Other
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if fr.Terms != nil && other.Terms != nil {
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for _, term := range other.Terms {
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fr.Terms = fr.Terms.Add(term)
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}
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}
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if fr.NumericRanges != nil && other.NumericRanges != nil {
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for _, nr := range other.NumericRanges {
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fr.NumericRanges = fr.NumericRanges.Add(nr)
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}
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}
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if fr.DateRanges != nil && other.DateRanges != nil {
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for _, dr := range other.DateRanges {
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fr.DateRanges = fr.DateRanges.Add(dr)
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}
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}
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}
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func (fr *FacetResult) Fixup(size int) {
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if fr.Terms != nil {
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sort.Sort(fr.Terms)
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if len(fr.Terms) > size {
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moveToOther := fr.Terms[size:]
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for _, mto := range moveToOther {
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fr.Other += mto.Count
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}
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fr.Terms = fr.Terms[0:size]
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}
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} else if fr.NumericRanges != nil {
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sort.Sort(fr.NumericRanges)
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if len(fr.NumericRanges) > size {
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moveToOther := fr.NumericRanges[size:]
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for _, mto := range moveToOther {
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fr.Other += mto.Count
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}
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fr.NumericRanges = fr.NumericRanges[0:size]
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}
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} else if fr.DateRanges != nil {
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sort.Sort(fr.DateRanges)
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if len(fr.DateRanges) > size {
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moveToOther := fr.DateRanges[size:]
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for _, mto := range moveToOther {
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fr.Other += mto.Count
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}
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fr.DateRanges = fr.DateRanges[0:size]
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}
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}
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}
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type FacetResults map[string]*FacetResult
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func (fr FacetResults) Merge(other FacetResults) {
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for name, oFacetResult := range other {
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facetResult, ok := fr[name]
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if ok {
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facetResult.Merge(oFacetResult)
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} else {
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fr[name] = oFacetResult
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}
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}
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}
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func (fr FacetResults) Fixup(name string, size int) {
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facetResult, ok := fr[name]
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if ok {
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facetResult.Fixup(size)
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}
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}
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func (fb *FacetsBuilder) Results() FacetResults {
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fr := make(FacetResults)
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for facetName, facetBuilder := range fb.facets {
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facetResult := facetBuilder.Result()
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fr[facetName] = facetResult
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}
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return fr
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}
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