2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.protocol.bgp.parser;
10 import java.util.List;
11 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.AsNumber;
12 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.Open;
13 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.open.message.BgpParameters;
14 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.open.message.bgp.parameters.OptionalCapabilities;
16 public final class AsNumberUtil {
18 private AsNumberUtil() {
19 throw new UnsupportedOperationException();
23 * Looks for As4Byte Capability in capabilities and extracts AS number.
25 * @param open remote BGP open message
28 public static AsNumber advertizedAsNumber(final Open open) {
29 // Look for AS4 capability very defensively
30 final List<BgpParameters> params = open.getBgpParameters();
32 for (final BgpParameters p : params) {
33 for (final OptionalCapabilities oc : p.getOptionalCapabilities()) {
34 if (oc.getCParameters() != null && oc.getCParameters().getAs4BytesCapability() != null) {
35 return oc.getCParameters().getAs4BytesCapability().getAsNumber();
40 // Fallback to whatever is in the header
41 return new AsNumber(open.getMyAsNumber().longValue());