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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 Query
subAggregations map[string]Aggregation
meta map[string]interface{}
}
func NewFilterAggregation() *FilterAggregation {
return &FilterAggregation{
subAggregations: make(map[string]Aggregation),
}
}
func (a *FilterAggregation) SubAggregation(name string, subAggregation Aggregation) *FilterAggregation {
a.subAggregations[name] = subAggregation
return a
}
// Meta sets the meta data to be included in the aggregation response.
func (a *FilterAggregation) Meta(metaData map[string]interface{}) *FilterAggregation {
a.meta = metaData
return a
}
func (a *FilterAggregation) Filter(filter Query) *FilterAggregation {
a.filter = filter
return a
}
func (a *FilterAggregation) Source() (interface{}, error) {
// Example:
// {
// "aggs" : {
// "in_stock_products" : {
// "filter" : { "range" : { "stock" : { "gt" : 0 } } }
// }
// }
// }
// This method returns only the { "filter" : {} } part.
src, err := a.filter.Source()
if err != nil {
return nil, err
}
source := make(map[string]interface{})
source["filter"] = src
// 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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