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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
// CumulativeSumAggregation is a parent pipeline aggregation which calculates
// the cumulative sum 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/current/search-aggregations-pipeline-cumulative-sum-aggregation.html
type CumulativeSumAggregation struct {
format string
subAggregations map[string]Aggregation
meta map[string]interface{}
bucketsPaths []string
}
// NewCumulativeSumAggregation creates and initializes a new CumulativeSumAggregation.
func NewCumulativeSumAggregation() *CumulativeSumAggregation {
return &CumulativeSumAggregation{
subAggregations: make(map[string]Aggregation),
bucketsPaths: make([]string, 0),
}
}
func (a *CumulativeSumAggregation) Format(format string) *CumulativeSumAggregation {
a.format = format
return a
}
// SubAggregation adds a sub-aggregation to this aggregation.
func (a *CumulativeSumAggregation) SubAggregation(name string, subAggregation Aggregation) *CumulativeSumAggregation {
a.subAggregations[name] = subAggregation
return a
}
// Meta sets the meta data to be included in the aggregation response.
func (a *CumulativeSumAggregation) Meta(metaData map[string]interface{}) *CumulativeSumAggregation {
a.meta = metaData
return a
}
// BucketsPath sets the paths to the buckets to use for this pipeline aggregator.
func (a *CumulativeSumAggregation) BucketsPath(bucketsPaths ...string) *CumulativeSumAggregation {
a.bucketsPaths = append(a.bucketsPaths, bucketsPaths...)
return a
}
func (a *CumulativeSumAggregation) Source() (interface{}, error) {
source := make(map[string]interface{})
params := make(map[string]interface{})
source["cumulative_sum"] = params
if a.format != "" {
params["format"] = a.format
}
// 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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