pcep/impl/src/main/java/org/opendaylight/protocol/pcep/impl/subobject/RROIpv4PrefixSubobjectParser.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.pcep.spi.PCEPDeserializerException;
  15 import org.opendaylight.protocol.pcep.spi.RROSubobjectParser;
  16 import org.opendaylight.protocol.pcep.spi.RROSubobjectSerializer;
  17 import org.opendaylight.protocol.util.ByteArray;
  18 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpPrefix;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.reported.route.object.rro.Subobjects;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.reported.route.object.rro.SubobjectsBuilder;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.IpPrefixSubobject;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.record.route.subobjects.subobject.type.IpPrefixCase;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.record.route.subobjects.subobject.type.IpPrefixCaseBuilder;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.record.route.subobjects.subobject.type.ip.prefix._case.IpPrefixBuilder;
  25
  26 import com.google.common.primitives.UnsignedBytes;
  27
  28 /**
  29  * Parser for {@link IpPrefixCase}
  30  */
  31 public class RROIpv4PrefixSubobjectParser implements RROSubobjectParser, RROSubobjectSerializer {
  32
  33         public static final int TYPE = 1;
  34
  35         private static final int IP4_F_LENGTH = 4;
  36
  37         private static final int PREFIX_F_LENGTH = 1;
  38         private static final int FLAGS_F_LENGTH = 1;
  39
  40         private static final int IP_F_OFFSET = 0;
  41
  42         private static final int PREFIX4_F_OFFSET = IP_F_OFFSET + IP4_F_LENGTH;
  43         private static final int FLAGS4_F_OFFSET = PREFIX4_F_OFFSET + PREFIX_F_LENGTH;
  44
  45         private static final int CONTENT4_LENGTH = IP4_F_LENGTH + PREFIX_F_LENGTH + FLAGS_F_LENGTH;
  46
  47         private static final int LPA_F_OFFSET = 7;
  48         private static final int LPIU_F_OFFSET = 6;
  49
  50         @Override
  51         public Subobjects parseSubobject(final byte[] buffer) throws PCEPDeserializerException {
  52                 if (buffer == null || buffer.length == 0) {
  53                         throw new IllegalArgumentException("Array of bytes is mandatory. Can't be null or empty.");
  54                 }
  55                 if (buffer.length != CONTENT4_LENGTH) {
  56                         throw new PCEPDeserializerException("Wrong length of array of bytes. Passed: " + buffer.length + ";");
  57                 }
  58                 final SubobjectsBuilder builder = new SubobjectsBuilder();
  59                 final int length = UnsignedBytes.toInt(buffer[PREFIX4_F_OFFSET]);
  60                 final BitSet flags = ByteArray.bytesToBitSet(Arrays.copyOfRange(buffer, FLAGS4_F_OFFSET, FLAGS4_F_OFFSET + FLAGS_F_LENGTH));
  61                 builder.setProtectionAvailable(flags.get(LPA_F_OFFSET));
  62                 builder.setProtectionInUse(flags.get(LPIU_F_OFFSET));
  63                 builder.setSubobjectType(new IpPrefixCaseBuilder().setIpPrefix(
  64                                 new IpPrefixBuilder().setIpPrefix(
  65                                                 new IpPrefix(Ipv4Util.prefixForBytes(ByteArray.subByte(buffer, IP_F_OFFSET, IP4_F_LENGTH), length))).build()).build());
  66                 return builder.build();
  67         }
  68
  69         @Override
  70         public byte[] serializeSubobject(final Subobjects subobject) {
  71                 if (!(subobject.getSubobjectType() instanceof IpPrefixCase)) {
  72                         throw new IllegalArgumentException("Unknown ReportedRouteSubobject instance. Passed " + subobject.getClass()
  73                                         + ". Needed IpPrefixCase.");
  74                 }
  75                 final IpPrefixSubobject specObj = ((IpPrefixCase) subobject.getSubobjectType()).getIpPrefix();
  76                 final IpPrefix prefix = specObj.getIpPrefix();
  77
  78                 if (prefix.getIpv4Prefix() == null && prefix.getIpv6Prefix() == null) {
  79                         throw new IllegalArgumentException("Unknown AbstractPrefix instance. Passed " + prefix.getClass() + ".");
  80                 }
  81                 final BitSet flags = new BitSet(FLAGS_F_LENGTH * Byte.SIZE);
  82                 flags.set(LPA_F_OFFSET, subobject.isProtectionAvailable());
  83                 flags.set(LPIU_F_OFFSET, subobject.isProtectionInUse());
  84
  85                 if (prefix.getIpv6Prefix() != null) {
  86                         return new RROIpv6PrefixSubobjectParser().serializeSubobject(subobject);
  87                 }
  88                 final byte[] retBytes = new byte[CONTENT4_LENGTH];
  89                 ByteArray.copyWhole(Ipv4Util.bytesForPrefix(prefix.getIpv4Prefix()), retBytes, IP_F_OFFSET);
  90                 retBytes[PREFIX4_F_OFFSET] = UnsignedBytes.checkedCast(Ipv4Util.getPrefixLength(prefix));
  91                 ByteArray.copyWhole(ByteArray.bitSetToBytes(flags, FLAGS_F_LENGTH), retBytes, FLAGS4_F_OFFSET);
  92                 return retBytes;
  93         }
  94
  95         @Override
  96         public int getType() {
  97                 return TYPE;
  98         }
  99 }