Running the application

Run Application.class - its a spring boot app and will bind to port 8080

Send a POST request to the endpoint at /fact/query

Run via maven

mvn spring-boot:run

Run FactQueryControllerIT for an end to end test

FactQueryController - REST endpoint

ExpressionDeserializer - handles the polymorphic types

Operator - enum describing supported operations

QueryService - applies the visitor pattern to process the JSON tree

CsvSecurityDataRepository - loads up the CSV data