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100 lines
2.5 KiB
100 lines
2.5 KiB
8 years ago
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// Copyright 2012-2015 Oliver Eilhard. All rights reserved.
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// Use of this source code is governed by a MIT-license.
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// See http://olivere.mit-license.org/license.txt for details.
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package elastic
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// MaxAggregation is a single-value metrics aggregation that keeps track and
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// returns the maximum value among the numeric values extracted from
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// the aggregated documents. These values can be extracted either from
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// specific numeric fields in the documents, or be generated by
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// a provided script.
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// See: http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-aggregations-metrics-max-aggregation.html
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type MaxAggregation struct {
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field string
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script *Script
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format string
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subAggregations map[string]Aggregation
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meta map[string]interface{}
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}
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func NewMaxAggregation() *MaxAggregation {
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return &MaxAggregation{
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subAggregations: make(map[string]Aggregation),
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}
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}
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func (a *MaxAggregation) Field(field string) *MaxAggregation {
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a.field = field
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return a
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}
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func (a *MaxAggregation) Script(script *Script) *MaxAggregation {
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a.script = script
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return a
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}
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func (a *MaxAggregation) Format(format string) *MaxAggregation {
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a.format = format
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return a
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}
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func (a *MaxAggregation) SubAggregation(name string, subAggregation Aggregation) *MaxAggregation {
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a.subAggregations[name] = subAggregation
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return a
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}
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// Meta sets the meta data to be included in the aggregation response.
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func (a *MaxAggregation) Meta(metaData map[string]interface{}) *MaxAggregation {
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a.meta = metaData
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return a
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}
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func (a *MaxAggregation) Source() (interface{}, error) {
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// Example:
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// {
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// "aggs" : {
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// "max_price" : { "max" : { "field" : "price" } }
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// }
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// }
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// This method returns only the { "max" : { "field" : "price" } } part.
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source := make(map[string]interface{})
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opts := make(map[string]interface{})
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source["max"] = opts
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// ValuesSourceAggregationBuilder
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if a.field != "" {
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opts["field"] = a.field
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}
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if a.script != nil {
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src, err := a.script.Source()
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if err != nil {
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return nil, err
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}
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opts["script"] = src
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}
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if a.format != "" {
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opts["format"] = a.format
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}
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// AggregationBuilder (SubAggregations)
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if len(a.subAggregations) > 0 {
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aggsMap := make(map[string]interface{})
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source["aggregations"] = aggsMap
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for name, aggregate := range a.subAggregations {
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src, err := aggregate.Source()
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if err != nil {
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return nil, err
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}
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aggsMap[name] = src
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}
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}
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// Add Meta data if available
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if len(a.meta) > 0 {
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source["meta"] = a.meta
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}
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return source, nil
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}
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