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99 lines
2.5 KiB
99 lines
2.5 KiB
// Copyright 2012-present 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: https://www.elastic.co/guide/en/elasticsearch/reference/5.2/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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