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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
// FilterAggregation defines a single bucket of all the documents
// in the current document set context that match a specified filter.
// Often this will be used to narrow down the current aggregation context
// to a specific set of documents.
// See: http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-aggregations-bucket-filter-aggregation.html
type FilterAggregation struct {
filter Filter
subAggregations map[string]Aggregation
}
func NewFilterAggregation() FilterAggregation {
a := FilterAggregation{
subAggregations: make(map[string]Aggregation),
}
return a
}
func (a FilterAggregation) SubAggregation(name string, subAggregation Aggregation) FilterAggregation {
a.subAggregations[name] = subAggregation
return a
}
func (a FilterAggregation) Filter(filter Filter) FilterAggregation {
a.filter = filter
return a
}
func (a FilterAggregation) Source() interface{} {
// Example:
// {
// "aggs" : {
// "in_stock_products" : {
// "filter" : { "range" : { "stock" : { "gt" : 0 } } }
// }
// }
// }
// This method returns only the { "filter" : {} } part.
source := make(map[string]interface{})
source["filter"] = a.filter.Source()
// AggregationBuilder (SubAggregations)
if len(a.subAggregations) > 0 {
aggsMap := make(map[string]interface{})
source["aggregations"] = aggsMap
for name, aggregate := range a.subAggregations {
aggsMap[name] = aggregate.Source()
}
}
return source
}
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