Java tutorial
/* * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved. * * This program and the accompanying materials are made available under the * terms of the Eclipse Public License v1.0 which accompanies this distribution, * and is available at http://www.eclipse.org/legal/epl-v10.html */ package org.opendaylight.protocol.bgp.linkstate.spi; import io.netty.buffer.ByteBuf; import io.netty.buffer.ByteBufUtil; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.object.type.prefix._case.PrefixDescriptors; import org.opendaylight.yangtools.yang.common.QName; import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public final class TlvUtil { public static final int TOPOLOGY_ID_OFFSET = 0x3fff; public static final int MULTI_TOPOLOGY_ID = 263; public static final NodeIdentifier MULTI_TOPOLOGY_NID = new NodeIdentifier( QName.create(PrefixDescriptors.QNAME, "topology-identifier").intern()); public static final int LOCAL_IPV4_ROUTER_ID = 1028; public static final int LOCAL_IPV6_ROUTER_ID = 1029; private static final Logger LOG = LoggerFactory.getLogger(TlvUtil.class); private TlvUtil() { throw new UnsupportedOperationException(); } /** * Util method for writing TLV header. * * @param type TLV type (2B) * @param value TLV value (2B) * @param byteAggregator final ByteBuf where the tlv should be serialized */ public static void writeTLV(final int type, final ByteBuf value, final ByteBuf byteAggregator) { byteAggregator.writeShort(type); byteAggregator.writeShort(value.writerIndex()); byteAggregator.writeBytes(value); if (LOG.isDebugEnabled()) { value.readerIndex(0); LOG.debug("Serialized tlv type {} to: {}", type, ByteBufUtil.hexDump(value)); } } }