pcep/impl/src/main/java/org/opendaylight/protocol/pcep/impl/subobject/EROIpPrefixSubobjectParser.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 org.opendaylight.protocol.concepts.Ipv4Util;
  11 import org.opendaylight.protocol.concepts.Ipv6Util;
  12 import org.opendaylight.protocol.pcep.PCEPDeserializerException;
  13 import org.opendaylight.protocol.pcep.spi.EROSubobjectParser;
  14 import org.opendaylight.protocol.pcep.spi.EROSubobjectSerializer;
  15 import org.opendaylight.protocol.util.ByteArray;
  16 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.IpPrefix;
  17 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.Subobjects;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.SubobjectsBuilder;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.IpPrefixSubobject;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.rsvp.rev130820.basic.explicit.route.subobjects.subobject.type.IpPrefixBuilder;
  21
  22 import com.google.common.primitives.UnsignedBytes;
  23
  24 /**
  25  * Parser for {@link IpPrefixSubobject}
  26  */
  27 public class EROIpPrefixSubobjectParser implements EROSubobjectParser, EROSubobjectSerializer {
  28
  29         public static final int TYPE = 1;
  30
  31         public static final int TYPE6 = 2;
  32
  33         public static final int IP4_F_LENGTH = 4;
  34         public static final int PREFIX4_F_LENGTH = 1;
  35
  36         public static final int PREFIX4_F_OFFSET = IP4_F_LENGTH;
  37
  38         public static final int CONTENT4_LENGTH = PREFIX4_F_OFFSET + PREFIX4_F_LENGTH + 1; // added reserved field of size 1
  39
  40         public static final int IP_F_LENGTH = 16;
  41         public static final int PREFIX_F_LENGTH = 1;
  42
  43         public static final int IP_F_OFFSET = 0;
  44         public static final int PREFIX_F_OFFSET = IP_F_OFFSET + IP_F_LENGTH;
  45
  46         public static final int CONTENT_LENGTH = PREFIX_F_OFFSET + PREFIX_F_LENGTH + 1; // added reserved field of size 1
  47                                                                                                                                                                         // byte
  48
  49         @Override
  50         public Subobjects parseSubobject(final byte[] buffer, final boolean loose) throws PCEPDeserializerException {
  51                 if (buffer == null || buffer.length == 0) {
  52                         throw new IllegalArgumentException("Array of bytes is mandatory. Can't be null or empty.");
  53                 }
  54
  55                 final SubobjectsBuilder builder = new SubobjectsBuilder();
  56                 builder.setLoose(loose);
  57
  58                 if (buffer.length == CONTENT4_LENGTH) {
  59                         final int length = UnsignedBytes.toInt(buffer[PREFIX4_F_OFFSET]);
  60                         builder.setSubobjectType(new IpPrefixBuilder().setIpPrefix(
  61                                         new IpPrefix(Ipv4Util.prefixForBytes(ByteArray.subByte(buffer, 0, IP4_F_LENGTH), length))).build());
  62                         return builder.build();
  63                 } else if (buffer.length == CONTENT_LENGTH) {
  64                         final int length = UnsignedBytes.toInt(buffer[PREFIX_F_OFFSET]);
  65                         builder.setSubobjectType(new IpPrefixBuilder().setIpPrefix(
  66                                         new IpPrefix(Ipv6Util.prefixForBytes(ByteArray.subByte(buffer, 0, IP_F_LENGTH), length))).build());
  67                         return builder.build();
  68                 } else {
  69                         throw new PCEPDeserializerException("Wrong length of array of bytes. Passed: " + buffer.length + ";");
  70                 }
  71         }
  72
  73         @Override
  74         public byte[] serializeSubobject(final Subobjects subobject) {
  75                 if (!(subobject.getSubobjectType() instanceof IpPrefixSubobject)) {
  76                         throw new IllegalArgumentException("Unknown subobject instance. Passed " + subobject.getSubobjectType().getClass()
  77                                         + ". Needed IpPrefixSubobject.");
  78                 }
  79                 final IpPrefixSubobject specObj = (IpPrefixSubobject) subobject.getSubobjectType();
  80                 final IpPrefix prefix = specObj.getIpPrefix();
  81
  82                 if (prefix.getIpv4Prefix() != null) {
  83                         final byte[] retBytes = new byte[CONTENT4_LENGTH];
  84                         ByteArray.copyWhole(prefix.getIpv4Prefix().getValue().getBytes(), retBytes, 0);
  85                         retBytes[PREFIX_F_OFFSET] = ByteArray.intToBytes(Ipv4Util.getPrefixLength(prefix))[Integer.SIZE / Byte.SIZE - 1];
  86                         return retBytes;
  87                 } else if (prefix.getIpv6Prefix() != null) {
  88                         final byte[] retBytes = new byte[CONTENT_LENGTH];
  89                         ByteArray.copyWhole(prefix.getIpv6Prefix().getValue().getBytes(), retBytes, 0);
  90                         retBytes[PREFIX_F_OFFSET] = ByteArray.intToBytes(Ipv4Util.getPrefixLength(prefix))[Integer.SIZE / Byte.SIZE - 1];
  91                         return retBytes;
  92                 }
  93                 throw new IllegalArgumentException("No valid IpPrefix");
  94         }
  95
  96         @Override
  97         public int getType() {
  98                 return TYPE;
  99         }
 100
 101         public int getType6() {
 102                 return TYPE6;
 103         }
 104 }