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// Copyright 2012-2015 Oliver Eilhard. All rights reserved.
// Use of this source code is governed by a MIT-license.
// See http://olivere.mit-license.org/license.txt for details.
package elastic
// Statistical facet allows to compute statistical data on a numeric fields.
// The statistical data include count, total, sum of squares, mean (average),
// minimum, maximum, variance, and standard deviation.
// See: http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-facets-statistical-facet.html
type StatisticalFacet struct {
facetFilter Filter
global *bool
nested string
mode string
fieldName string
fieldNames []string
}
func NewStatisticalFacet() StatisticalFacet {
return StatisticalFacet{
fieldNames: make([]string, 0),
}
}
func (f StatisticalFacet) FacetFilter(filter Facet) StatisticalFacet {
f.facetFilter = filter
return f
}
func (f StatisticalFacet) Global(global bool) StatisticalFacet {
f.global = &global
return f
}
func (f StatisticalFacet) Nested(nested string) StatisticalFacet {
f.nested = nested
return f
}
func (f StatisticalFacet) Mode(mode string) StatisticalFacet {
f.mode = mode
return f
}
func (f StatisticalFacet) Field(fieldName string) StatisticalFacet {
f.fieldName = fieldName
return f
}
func (f StatisticalFacet) Fields(fieldNames ...string) StatisticalFacet {
f.fieldNames = append(f.fieldNames, fieldNames...)
return f
}
func (f StatisticalFacet) addFilterFacetAndGlobal(source map[string]interface{}) {
if f.facetFilter != nil {
source["facet_filter"] = f.facetFilter.Source()
}
if f.nested != "" {
source["nested"] = f.nested
}
if f.global != nil {
source["global"] = *f.global
}
if f.mode != "" {
source["mode"] = f.mode
}
}
func (f StatisticalFacet) Source() interface{} {
source := make(map[string]interface{})
f.addFilterFacetAndGlobal(source)
opts := make(map[string]interface{})
source["statistical"] = opts
if len(f.fieldNames) > 0 {
if len(f.fieldNames) == 1 {
opts["field"] = f.fieldNames[0]
} else {
opts["fields"] = f.fieldNames
}
} else {
opts["field"] = f.fieldName
}
return source
}
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