Java tutorial
/* * Copyright (c) 2016 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.evpn.impl.nlri; import static org.opendaylight.protocol.bgp.evpn.impl.nlri.NlriModelUtil.MPLS1_NID; import static org.opendaylight.protocol.bgp.evpn.impl.nlri.NlriModelUtil.MPLS2_NID; import static org.opendaylight.protocol.bgp.evpn.impl.nlri.NlriModelUtil.extractETI; import static org.opendaylight.protocol.bgp.evpn.impl.nlri.NlriModelUtil.extractIp; import static org.opendaylight.protocol.bgp.evpn.impl.nlri.NlriModelUtil.extractMAC; import static org.opendaylight.protocol.bgp.evpn.impl.nlri.NlriModelUtil.extractMplsLabel; import static org.opendaylight.protocol.util.MplsLabelUtil.byteBufForMplsLabel; import static org.opendaylight.protocol.util.MplsLabelUtil.mplsLabelForByteBuf; import com.google.common.base.Preconditions; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import org.opendaylight.protocol.bgp.evpn.spi.pojo.SimpleEsiTypeRegistry; import org.opendaylight.protocol.util.ByteArray; import org.opendaylight.protocol.util.ByteBufWriteUtil; import org.opendaylight.protocol.util.Ipv4Util; import org.opendaylight.protocol.util.Ipv6Util; import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress; import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.IetfYangUtil; import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.MacAddress; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.NlriType; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.esi.Esi; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.ethernet.tag.id.EthernetTagId; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.ethernet.tag.id.EthernetTagIdBuilder; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.evpn.EvpnChoice; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.evpn.evpn.choice.MacIpAdvRouteCase; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.evpn.evpn.choice.MacIpAdvRouteCaseBuilder; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.mac.ip.adv.route.MacIpAdvRoute; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.evpn.rev160321.mac.ip.adv.route.MacIpAdvRouteBuilder; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.network.concepts.rev131125.MplsLabel; import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier; import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode; final class MACIpAdvRParser extends AbstractEvpnNlri { static final NodeIdentifier MAC_IP_ADV_ROUTE_NID = new NodeIdentifier(MacIpAdvRoute.QNAME); private static final int BITS_SIZE = 8; @Override public EvpnChoice parseEvpn(final ByteBuf buffer) { final Esi esi = SimpleEsiTypeRegistry.getInstance().parseEsi(buffer.readSlice(ESI_SIZE)); final EthernetTagId eti = new EthernetTagIdBuilder().setVlanId(buffer.readUnsignedInt()).build(); buffer.skipBytes(1); final MacAddress mac = IetfYangUtil.INSTANCE.macAddressFor(ByteArray.readBytes(buffer, MAC_ADDRESS_LENGTH)); final IpAddress ip = parseIp(buffer); final MplsLabel label1 = mplsLabelForByteBuf(buffer); MplsLabel label2; if (buffer.readableBytes() > 0) { label2 = mplsLabelForByteBuf(buffer); } else { label2 = null; } final MacIpAdvRouteBuilder builder = new MacIpAdvRouteBuilder().setEsi(esi).setEthernetTagId(eti) .setMacAddress(mac).setIpAddress(ip).setMplsLabel1(label1).setMplsLabel2(label2); return new MacIpAdvRouteCaseBuilder().setMacIpAdvRoute(builder.build()).build(); } @Override protected NlriType getType() { return NlriType.MacIpAdv; } @Override public ByteBuf serializeBody(final EvpnChoice evpn) { Preconditions.checkArgument(evpn instanceof MacIpAdvRouteCase, "Unknown evpn instance. Passed %s. Needed MacIpAdvRouteCase.", evpn.getClass()); return serializeBody((MacIpAdvRouteCase) evpn); } @Override public EvpnChoice serializeEvpnModel(final ContainerNode evpn) { final MacIpAdvRouteBuilder builder = serializeKeyModel(evpn); builder.setEsi(serializeEsi(evpn)); builder.setMplsLabel1(extractMplsLabel(evpn, MPLS1_NID)); builder.setMplsLabel2(extractMplsLabel(evpn, MPLS2_NID)); return new MacIpAdvRouteCaseBuilder().setMacIpAdvRoute(builder.build()).build(); } @Override public EvpnChoice createRouteKey(final ContainerNode evpn) { return new MacIpAdvRouteCaseBuilder().setMacIpAdvRoute(serializeKeyModel(evpn).build()).build(); } private static MacIpAdvRouteBuilder serializeKeyModel(final ContainerNode evpn) { final MacIpAdvRouteBuilder builder = new MacIpAdvRouteBuilder(); builder.setEthernetTagId(extractETI(evpn)); builder.setMacAddress(extractMAC(evpn)); builder.setIpAddress(extractIp(evpn)); return builder; } private static ByteBuf serializeBody(final MacIpAdvRouteCase evpnCase) { final ByteBuf body = Unpooled.buffer(); final MacIpAdvRoute evpn = evpnCase.getMacIpAdvRoute(); final Esi esi = evpn.getEsi(); if (esi != null) { SimpleEsiTypeRegistry.getInstance().serializeEsi(evpn.getEsi(), body); } ByteBufWriteUtil.writeUnsignedInt(evpn.getEthernetTagId().getVlanId(), body); final MacAddress mac = evpn.getMacAddress(); body.writeByte(MAC_ADDRESS_LENGTH * BITS_SIZE); body.writeBytes(IetfYangUtil.INSTANCE.bytesFor(mac)); final ByteBuf ipAddress = serializeIp(evpn.getIpAddress()); Preconditions.checkArgument(ipAddress.readableBytes() > 0); body.writeBytes(ipAddress); final MplsLabel mpls1 = evpn.getMplsLabel1(); if (mpls1 != null) { body.writeBytes(byteBufForMplsLabel(mpls1)); } final MplsLabel mpls2 = evpn.getMplsLabel2(); if (mpls2 != null) { body.writeBytes(byteBufForMplsLabel(mpls2)); } return body; } private static ByteBuf serializeIp(final IpAddress ipAddress) { final ByteBuf body = Unpooled.buffer(); if (ipAddress != null) { if (ipAddress.getIpv4Address() != null) { body.writeByte(Ipv4Util.IP4_BITS_LENGTH); body.writeBytes(Ipv4Util.bytesForAddress(ipAddress.getIpv4Address())); } else if (ipAddress.getIpv6Address() != null) { body.writeByte(Ipv6Util.IPV6_BITS_LENGTH); body.writeBytes(Ipv6Util.bytesForAddress(ipAddress.getIpv6Address())); } else { body.writeZero(ZERO_BYTE); } } else { body.writeZero(ZERO_BYTE); } return body; } private static IpAddress parseIp(final ByteBuf buffer) { final int ipLength = buffer.readUnsignedByte(); if (ipLength == Ipv6Util.IPV6_BITS_LENGTH) { return new IpAddress(Ipv6Util.addressForByteBuf(buffer)); } else if (ipLength == Ipv4Util.IP4_BITS_LENGTH) { return new IpAddress(Ipv4Util.addressForByteBuf(buffer)); } return null; } }