How can I modify my java method to also display cosModel without modifying the enums?

Hello, I need help writing my method mapDirectionToTrafficProfileDirection() I need to add CosModel to my method, I cannot change the enum values, so that's out of the question.       Cos6 will always be Both for Direction.  Cos4 has in and out or Egress and Ingress. How can I modify my code  mapDirectionToTrafficProfileDirection() to do this?

public class TrafficProfileExtension {
	public static enum Direction {
		Egress, Ingress, Both;
	}
	public static enum CosModel {
		cos6,cos4;
	}

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public enum Direction
    implements EnumValue<String>
{
    IN,
    OUT;
	}

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@XmlType(name = "CosModel")
@XmlEnum
public enum CosModel implements EnumValue<String>
{
    COS_4("Cos4"),
    @XmlEnumValue("Cos6")
    COS_6("Cos6"),
	}

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private TrafficProfileExtension.Direction mapDirectionToTrafficProfileDirection (Direction direction, CosModel cosModel){

		if (Direction.OUT.equals(direction)){
			return TrafficProfileExtension.Direction.Egress;
		}
		if (Direction.IN.equals(direction)){
			return TrafficProfileExtension.Direction.Ingress;
		}
		return null;
	}

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We have this method in our code and they were able to add the enum without changing the enum in Direction class. Example method below:

private  List<Direction> mapTrafficProfileDirection (TrafficProfileExtension.Direction direction)  throws  Exception  {

    List<Direction>  directionList = new ArrayList<Direction>();

    if (TrafficProfileExtension.Direction.Egress.equals(direction)){
        directionList.add(Direction.OUT);
        return directionList;
    }
    if (TrafficProfileExtension.Direction.Ingress.equals(direction)){
        directionList.add(Direction.IN);
        return directionList;
    }
    if (TrafficProfileExtension.Direction.Both.equals(direction)){
        directionList.add(Direction.OUT);
        directionList.add(Direction.IN);
        return directionList;

    }

    throw new Exception("Illegal direction passed through method " + direction.name());

}

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