QueryController

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.beans.factory.annotation.Autowired;

@RestController
public class QueryController {
  
  @Autowired
  private QueryAdapter queryAdapter;
  
  @RequestMapping("/{tableName}/avg/{field1}/by/{field2}")
  public Graph avg(@PathVariable String tableName,
                   @PathVariable String field1,
                   @PathVariable String field2) {
    return queryAdapter
              .select(field1, field2)
              .from(tableName)
              .aggregate(new Average(field1, field2));
  }
  // Endpoints for other aggregation functions: sum, count etc.
}