switch epSlice.AddressType {
				case discovery.AddressTypeIPv4:
					matchingEndpointsV4 = append(matchingEndpointsV4, epSlice.Endpoints...)
				case discovery.AddressTypeIPv6:
					matchingEndpointsV6 = append(matchingEndpointsV6, epSlice.Endpoints...)
				default:
					t.Fatalf("Unexpected EndpointSlice address type found: %v", epSlice.AddressType)
				}
			}
		}

	disableRouteGeneration bool

	// disableNameSuffix, if set, will avoid appending -<class> to names
	disableNameSuffix bool

	// addressType is the default address type to report
	addressType gateway.AddressType
}

var classInfos = getClassInfos()

var builtinClasses = getBuiltinClasses()

func getBuiltinClasses() map[gateway.ObjectName]gateway.GatewayController {

                    ASN1Integer addressType = ASN1Util.as(ASN1Integer.class, addressSequence, 0);
                    DEROctetString addressOctets = ASN1Util.as(DEROctetString.class, addressSequence, 1);

                    this.userAddresses = new ArrayList<>();
                    if ( addressType.getValue().intValue() == KerberosConstants.AF_INTERNET ) {

// but using netip.Addr instead of net.IP
func addOffsetAddress(address netip.Addr, offset uint64) (netip.Addr, error) {
	addressBytes := address.AsSlice()
	addressBig := big.NewInt(0).SetBytes(addressBytes)
	r := big.NewInt(0).Add(addressBig, big.NewInt(int64(offset))).Bytes()
	// r must be 4 or 16 bytes depending of the ip family

    int numBytes = isIpv6 ? 16 : 4;

    byte[] addressBytes = address.toByteArray();
    byte[] targetCopyArray = new byte[numBytes];

    int srcPos = Math.max(0, addressBytes.length - numBytes);
    int copyLength = addressBytes.length - srcPos;
    int destPos = numBytes - copyLength;

    // Check the extra bytes in the BigInteger are all zero.

    int numBytes = isIpv6 ? 16 : 4;

    byte[] addressBytes = address.toByteArray();
    byte[] targetCopyArray = new byte[numBytes];

    int srcPos = Math.max(0, addressBytes.length - numBytes);
    int copyLength = addressBytes.length - srcPos;
    int destPos = numBytes - copyLength;

    // Check the extra bytes in the BigInteger are all zero.

				Addresses: []k8s.GatewayAddress{
					{
						Value: "abc",
					},
					{
						Type: func() *k8s.AddressType {
							t := k8s.HostnameAddressType
							return &t
						}(),
						Value: "example.com",
					},
					{
						Type: func() *k8s.AddressType {
							t := k8s.IPAddressType
							return &t
						}(),
						Value: "1.2.3.4",
					},
				},
			},

				{Type: v1.NodeHostName, Address: hostname},
			}
		}
		return nil
	}
}

func hasAddressType(addresses []v1.NodeAddress, addressType v1.NodeAddressType) bool {
	for _, address := range addresses {
		if address.Type == addressType {
			return true
		}
	}
	return false
}
func hasAddressValue(addresses []v1.NodeAddress, addressValue string) bool {
	for _, address := range addresses {

	epPort := 8080

	eps := &discovery.EndpointSlice{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "ep",
			Namespace: "namespace",
		},
		AddressType: discovery.AddressTypeIPv4,
		Endpoints:   []discovery.Endpoint{},
		Ports: []discovery.EndpointPort{{
			Name:     ptr.To(fmt.Sprintf("%d", epPort)),
			Port:     ptr.To(int32(epPort)),

				},
				Spec: k8s.GatewaySpec{
					GatewayClassName: k8s.ObjectName(features.GatewayAPIDefaultGatewayClass),
					Addresses: []k8s.GatewayAddress{{
						Type:  func() *k8s.AddressType { x := k8s.IPAddressType; return &x }(),
						Value: "1.2.3.4",
					}},
				},
			},
			objects:                  defaultObjects,
			discoveryNamespaceFilter: discoveryNamespacesFilter,
		},
		{