Package ca.uhn.fhir.jpa.dao.search

Class LastNAggregation

java.lang.Object
ca.uhn.fhir.jpa.dao.search.LastNAggregation
public class LastNAggregation extends Object
Builds lastN aggregation, and parse the results

  • Constructor Details

    • LastNAggregation

      public LastNAggregation(int theLastNMax, boolean theAggregateOnSubject)

  • Method Details

    • toAggregation

      public com.google.gson.JsonObject toAggregation()
      Aggregation template json.

      https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations.html

    • extractResourceIds

      public List<Long> extractResourceIds(@Nonnull com.google.gson.JsonObject theAggregationResult)
      Parses the JSONObject aggregation result from ES to extract observation resource ids E.g aggregation result payload 
       
 {
   "doc_count_error_upper_bound": 0,
   "sum_other_doc_count": 0,
   "buckets": [
     {
       "key": "http://mycode.com|code0",
       "doc_count": 45,
       "most_recent_effective": {
         "hits": {
           "total": {
             "value": 45,
             "relation": "eq"
           },
           "max_score": null,
           "hits": [
             {
               "_index": "resourcetable-000001",
               "_type": "_doc",
               "_id": "48",
               "_score": null,
               "_source": {
                 "myId": 48
               },
               "sort": [
                 1643673125112
               ]
             }
           ]
         }
       }
     },
     {
       "key": "http://mycode.com|code1",
       "doc_count": 30,
       "most_recent_effective": {
         "hits": {
           "total": {
             "value": 30,
             "relation": "eq"
           },
           "max_score": null,
           "hits": [
             {
               "_index": "resourcetable-000001",
               "_type": "_doc",
               "_id": "58",
               "_score": null,
               "_source": {
                 "myId": 58
               },
               "sort": [
                 1643673125112
               ]
             }
           ]
         }
       }
     }
   ]
 }