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// Copyright 2012-present 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
// DerivativeAggregation is a parent pipeline aggregation which calculates
// the derivative of a specified metric in a parent histogram (or date_histogram)
// aggregation. The specified metric must be numeric and the enclosing
// histogram must have min_doc_count set to 0 (default for histogram aggregations).
//
// For more details, see
// https://www.elastic.co/guide/en/elasticsearch/reference/6.0/search-aggregations-pipeline-derivative-aggregation.html
type DerivativeAggregation struct {
format string
gapPolicy string
unit string
subAggregations map[string]Aggregation
meta map[string]interface{}
bucketsPaths []string
}
// NewDerivativeAggregation creates and initializes a new DerivativeAggregation.
func NewDerivativeAggregation() *DerivativeAggregation {
return &DerivativeAggregation{
subAggregations: make(map[string]Aggregation),
bucketsPaths: make([]string, 0),
}
}
func (a *DerivativeAggregation) Format(format string) *DerivativeAggregation {
a.format = format
return a
}
// GapPolicy defines what should be done when a gap in the series is discovered.
// Valid values include "insert_zeros" or "skip". Default is "insert_zeros".
func (a *DerivativeAggregation) GapPolicy(gapPolicy string) *DerivativeAggregation {
a.gapPolicy = gapPolicy
return a
}
// GapInsertZeros inserts zeros for gaps in the series.
func (a *DerivativeAggregation) GapInsertZeros() *DerivativeAggregation {
a.gapPolicy = "insert_zeros"
return a
}
// GapSkip skips gaps in the series.
func (a *DerivativeAggregation) GapSkip() *DerivativeAggregation {
a.gapPolicy = "skip"
return a
}
// Unit sets the unit provided, e.g. "1d" or "1y".
// It is only useful when calculating the derivative using a date_histogram.
func (a *DerivativeAggregation) Unit(unit string) *DerivativeAggregation {
a.unit = unit
return a
}
// SubAggregation adds a sub-aggregation to this aggregation.
func (a *DerivativeAggregation) SubAggregation(name string, subAggregation Aggregation) *DerivativeAggregation {
a.subAggregations[name] = subAggregation
return a
}
// Meta sets the meta data to be included in the aggregation response.
func (a *DerivativeAggregation) Meta(metaData map[string]interface{}) *DerivativeAggregation {
a.meta = metaData
return a
}
// BucketsPath sets the paths to the buckets to use for this pipeline aggregator.
func (a *DerivativeAggregation) BucketsPath(bucketsPaths ...string) *DerivativeAggregation {
a.bucketsPaths = append(a.bucketsPaths, bucketsPaths...)
return a
}
func (a *DerivativeAggregation) Source() (interface{}, error) {
source := make(map[string]interface{})
params := make(map[string]interface{})
source["derivative"] = params
if a.format != "" {
params["format"] = a.format
}
if a.gapPolicy != "" {
params["gap_policy"] = a.gapPolicy
}
if a.unit != "" {
params["unit"] = a.unit
}
// Add buckets paths
switch len(a.bucketsPaths) {
case 0:
case 1:
params["buckets_path"] = a.bucketsPaths[0]
default:
params["buckets_path"] = a.bucketsPaths
}
// AggregationBuilder (SubAggregations)
if len(a.subAggregations) > 0 {
aggsMap := make(map[string]interface{})
source["aggregations"] = aggsMap
for name, aggregate := range a.subAggregations {
src, err := aggregate.Source()
if err != nil {
return nil, err
}
aggsMap[name] = src
}
}
// Add Meta data if available
if len(a.meta) > 0 {
source["meta"] = a.meta
}
return source, nil
}
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