bgp/parser-impl/src/main/java/org/opendaylight/protocol/bgp/parser/impl/message/open/MultiProtocolCapabilityHandler.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   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
   7  */
   8 package org.opendaylight.protocol.bgp.parser.impl.message.open;
   9
  10 import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
  11 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
  12 import org.opendaylight.protocol.bgp.parser.spi.AddressFamilyRegistry;
  13 import org.opendaylight.protocol.bgp.parser.spi.CapabilityParser;
  14 import org.opendaylight.protocol.bgp.parser.spi.CapabilitySerializer;
  15 import org.opendaylight.protocol.bgp.parser.spi.CapabilityUtil;
  16 import org.opendaylight.protocol.bgp.parser.spi.SubsequentAddressFamilyRegistry;
  17 import org.opendaylight.protocol.util.ByteArray;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.open.bgp.parameters.CParameters;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.open.bgp.parameters.c.parameters.CMultiprotocol;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.open.bgp.parameters.c.parameters.CMultiprotocolBuilder;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.open.bgp.parameters.c.parameters.c.multiprotocol.MultiprotocolCapabilityBuilder;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.SubsequentAddressFamily;
  24
  25 import com.google.common.base.Preconditions;
  26 import com.google.common.primitives.UnsignedBytes;
  27
  28 public final class MultiProtocolCapabilityHandler implements CapabilityParser, CapabilitySerializer {
  29         public static final int CODE = 1;
  30
  31         private static final int AFI_SIZE = 2;
  32         private static final int SAFI_SIZE = 1;
  33
  34         private final AddressFamilyRegistry afiReg;
  35         private final SubsequentAddressFamilyRegistry safiReg;
  36
  37         public MultiProtocolCapabilityHandler(final AddressFamilyRegistry afiReg, final SubsequentAddressFamilyRegistry safiReg) {
  38                 this.afiReg = Preconditions.checkNotNull(afiReg);
  39                 this.safiReg = Preconditions.checkNotNull(safiReg);
  40         }
  41
  42         @Override
  43         public CMultiprotocol parseCapability(final byte[] bytes) throws BGPDocumentedException, BGPParsingException {
  44                 final int afiVal = ByteArray.bytesToInt(ByteArray.subByte(bytes, 0, AFI_SIZE));
  45                 final Class<? extends AddressFamily> afi = this.afiReg.classForFamily(afiVal);
  46                 if (afi == null) {
  47                         throw new BGPParsingException("Address Family Identifier: '" + afiVal + "' not supported.");
  48                 }
  49
  50                 final int safiVal = ByteArray.bytesToInt(ByteArray.subByte(bytes, AFI_SIZE + 1, SAFI_SIZE));
  51                 final Class<? extends SubsequentAddressFamily> safi = this.safiReg.classForFamily(safiVal);
  52                 if (safi == null) {
  53                         throw new BGPParsingException("Subsequent Address Family Identifier: '" + safiVal + "' not supported.");
  54                 }
  55
  56                 return new CMultiprotocolBuilder().setMultiprotocolCapability(
  57                                 new MultiprotocolCapabilityBuilder().setAfi(afi).setSafi(safi).build()).build();
  58         }
  59
  60         @Override
  61         public byte[] serializeCapability(final CParameters capability) {
  62                 final CMultiprotocol mp = (CMultiprotocol) capability;
  63
  64                 final Class<? extends AddressFamily> afi = mp.getMultiprotocolCapability().getAfi();
  65                 final Integer afival = this.afiReg.numberForClass(afi);
  66                 Preconditions.checkArgument(afival != null, "Unhandled address family " + afi);
  67
  68                 final Class<? extends SubsequentAddressFamily> safi = mp.getMultiprotocolCapability().getSafi();
  69                 final Integer safival = this.safiReg.numberForClass(safi);
  70                 Preconditions.checkArgument(safival != null, "Unhandled subsequent address family " + safi);
  71
  72                 return CapabilityUtil.formatCapability(
  73                                 CODE,
  74                                 new byte[] { UnsignedBytes.checkedCast(afival / 256), UnsignedBytes.checkedCast(afival % 256), 0,
  75                                                 UnsignedBytes.checkedCast(safival) });
  76         }
  77 }