pcep/impl/src/main/java/org/opendaylight/protocol/pcep/impl/subobject/RROIpPrefixSubobjectParser.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.pcep.impl.subobject;
   9
  10 import java.util.Arrays;
  11 import java.util.BitSet;
  12
  13 import org.opendaylight.protocol.concepts.Ipv4Util;
  14 import org.opendaylight.protocol.concepts.Ipv6Util;
  15 import org.opendaylight.protocol.pcep.PCEPDeserializerException;
  16 import org.opendaylight.protocol.pcep.spi.RROSubobjectParser;
  17 import org.opendaylight.protocol.pcep.spi.RROSubobjectSerializer;
  18 import org.opendaylight.protocol.util.ByteArray;
  19 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpPrefix;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.ReportedRouteObject;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.reported.route.object.Subobjects;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.reported.route.object.SubobjectsBuilder;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.IpPrefixSubobject;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.record.route.subobjects.subobject.type.IpPrefixBuilder;
  25
  26 import com.google.common.primitives.UnsignedBytes;
  27
  28 /**
  29  * Parser for {@link ReportedRouteObject}
  30  */
  31 public class RROIpPrefixSubobjectParser implements RROSubobjectParser, RROSubobjectSerializer {
  32
  33         public static final int TYPE = 1;
  34
  35         public static final int TYPE6 = 2;
  36
  37         private static final int IP4_F_LENGTH = 4;
  38         private static final int IP_F_LENGTH = 16;
  39
  40         private static final int PREFIX_F_LENGTH = 1;
  41         private static final int FLAGS_F_LENGTH = 1;
  42
  43         private static final int IP_F_OFFSET = 0;
  44
  45         private static final int PREFIX4_F_OFFSET = IP_F_OFFSET + IP4_F_LENGTH;
  46         private static final int FLAGS4_F_OFFSET = PREFIX4_F_OFFSET + PREFIX_F_LENGTH;
  47
  48         private static final int CONTENT4_LENGTH = IP4_F_LENGTH + PREFIX_F_LENGTH + FLAGS_F_LENGTH;
  49
  50         private static final int PREFIX_F_OFFSET = IP_F_OFFSET + IP_F_LENGTH;
  51         private static final int FLAGS_F_OFFSET = PREFIX_F_OFFSET + PREFIX_F_LENGTH;
  52
  53         private static final int CONTENT_LENGTH = IP_F_LENGTH + PREFIX_F_LENGTH + FLAGS_F_LENGTH;
  54
  55         private static final int LPA_F_OFFSET = 7;
  56         private static final int LPIU_F_OFFSET = 6;
  57
  58         @Override
  59         public Subobjects parseSubobject(final byte[] buffer) throws PCEPDeserializerException {
  60                 if (buffer == null || buffer.length == 0) {
  61                         throw new IllegalArgumentException("Array of bytes is mandatory. Can't be null or empty.");
  62                 }
  63                 final SubobjectsBuilder builder = new SubobjectsBuilder();
  64                 if (buffer.length == CONTENT4_LENGTH) {
  65                         final int length = UnsignedBytes.toInt(buffer[PREFIX4_F_OFFSET]);
  66                         final BitSet flags = ByteArray.bytesToBitSet(Arrays.copyOfRange(buffer, FLAGS4_F_OFFSET, FLAGS4_F_OFFSET + FLAGS_F_LENGTH));
  67                         builder.setProtectionAvailable(flags.get(LPA_F_OFFSET));
  68                         builder.setProtectionInUse(flags.get(LPIU_F_OFFSET));
  69                         builder.setSubobjectType(new IpPrefixBuilder().setIpPrefix(
  70                                         new IpPrefix(Ipv4Util.prefixForBytes(ByteArray.subByte(buffer, IP_F_OFFSET, IP4_F_LENGTH), length))).build());
  71                 } else if (buffer.length == CONTENT_LENGTH) {
  72                         final int length = UnsignedBytes.toInt(buffer[PREFIX_F_OFFSET]);
  73                         final BitSet flags = ByteArray.bytesToBitSet(Arrays.copyOfRange(buffer, FLAGS_F_OFFSET, FLAGS_F_OFFSET + FLAGS_F_LENGTH));
  74                         builder.setProtectionAvailable(flags.get(LPA_F_OFFSET));
  75                         builder.setProtectionInUse(flags.get(LPIU_F_OFFSET));
  76                         builder.setSubobjectType(new IpPrefixBuilder().setIpPrefix(
  77                                         new IpPrefix(Ipv6Util.prefixForBytes(ByteArray.subByte(buffer, IP_F_OFFSET, IP_F_LENGTH), length))).build());
  78                 } else {
  79                         throw new PCEPDeserializerException("Wrong length of array of bytes. Passed: " + buffer.length + ";");
  80                 }
  81                 return builder.build();
  82         }
  83
  84         @Override
  85         public byte[] serializeSubobject(final Subobjects subobject) {
  86                 if (!(subobject.getSubobjectType() instanceof IpPrefixSubobject)) {
  87                         throw new IllegalArgumentException("Unknown ReportedRouteSubobject instance. Passed " + subobject.getClass()
  88                                         + ". Needed RROIPAddressSubobject.");
  89                 }
  90
  91                 final IpPrefixSubobject specObj = (IpPrefixSubobject) subobject.getSubobjectType();
  92                 final IpPrefix prefix = specObj.getIpPrefix();
  93
  94                 if (prefix.getIpv4Prefix() == null && prefix.getIpv6Prefix() == null) {
  95                         throw new IllegalArgumentException("Unknown AbstractPrefix instance. Passed " + prefix.getClass() + ".");
  96                 }
  97
  98                 final BitSet flags = new BitSet(FLAGS_F_LENGTH * Byte.SIZE);
  99                 flags.set(LPA_F_OFFSET, subobject.isProtectionAvailable());
 100                 flags.set(LPIU_F_OFFSET, subobject.isProtectionInUse());
 101
 102                 if (prefix.getIpv4Prefix() != null) {
 103                         final byte[] retBytes = new byte[CONTENT4_LENGTH];
 104                         ByteArray.copyWhole(Ipv4Util.bytesForPrefix(prefix.getIpv4Prefix()), retBytes, IP_F_OFFSET);
 105                         retBytes[PREFIX4_F_OFFSET] = UnsignedBytes.checkedCast(Ipv4Util.getPrefixLength(prefix));
 106                         ByteArray.copyWhole(ByteArray.bitSetToBytes(flags, FLAGS_F_LENGTH), retBytes, FLAGS4_F_OFFSET);
 107                         return retBytes;
 108                 } else {
 109                         final byte[] retBytes = new byte[CONTENT_LENGTH];
 110                         ByteArray.copyWhole(Ipv6Util.bytesForPrefix(prefix.getIpv6Prefix()), retBytes, IP_F_OFFSET);
 111                         retBytes[PREFIX_F_OFFSET] = UnsignedBytes.checkedCast(Ipv4Util.getPrefixLength(prefix));
 112                         ByteArray.copyWhole(ByteArray.bitSetToBytes(flags, FLAGS_F_LENGTH), retBytes, FLAGS_F_OFFSET);
 113                         return retBytes;
 114                 }
 115         }
 116
 117         @Override
 118         public int getType() {
 119                 return TYPE;
 120         }
 121
 122         public int getType6() {
 123                 return TYPE6;
 124         }
 125 }