in_java.java

import org.apache.hadoop.hive.ql.exec.UDF;

public class FindMaxDelayType extends UDF {
  public enum DelayTypes {carrier,weather,nas,security,late_aircraft}
  
  public String evaluate(double carrier, double weather, double nas, double security, double late_aircraft) {
    double currentMax = carrier;
    int index = 0;

    if(weather > currentMax) {
      currentMax = weather;
      index = 1;
    }

    if(nas > currentMax) {
      currentMax = nas;
      index = 2;
    }

    if(security > currentMax) {
      currentMax = security;
      index = 3;
    }

    if(late_aircraft > currentMax) {
      currentMax = late_aircraft;
      index = 4;
    }
    
    return DelayTypes.values()[index].name();
  }
}