concepts/src/main/java/org/opendaylight/protocol/concepts/Ipv6Util.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.concepts;
   9
  10 import java.net.Inet6Address;
  11 import java.net.InetAddress;
  12 import java.net.UnknownHostException;
  13 import java.util.Arrays;
  14 import java.util.Collections;
  15 import java.util.List;
  16
  17 import org.opendaylight.protocol.util.ByteArray;
  18 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv6Address;
  19 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv6Prefix;
  20
  21 import com.google.common.base.Preconditions;
  22 import com.google.common.collect.Lists;
  23 import com.google.common.net.InetAddresses;
  24 import com.google.common.primitives.Bytes;
  25 import com.google.common.primitives.UnsignedBytes;
  26
  27 /**
  28  * Util class for creating generated Ipv6Address.
  29  */
  30 public final class Ipv6Util {
  31         private Ipv6Util() {
  32         }
  33
  34         public static final int IPV6_LENGTH = 16;
  35
  36         private static InetAddress getAddress(final byte[] bytes) {
  37                 try {
  38                         return Inet6Address.getByAddress(bytes);
  39                 } catch (final UnknownHostException e) {
  40                         throw new IllegalArgumentException("Failed to construct IPv6 address", e);
  41                 }
  42         }
  43
  44         public static Ipv6Address addressForBytes(final byte[] bytes) {
  45                 return new Ipv6Address(InetAddresses.toAddrString(getAddress(bytes)));
  46         }
  47
  48         public static byte[] bytesForAddress(final Ipv6Address address) {
  49                 final InetAddress a = InetAddresses.forString(address.getValue());
  50                 Preconditions.checkArgument(a instanceof Inet6Address);
  51                 return a.getAddress();
  52         }
  53
  54         public static byte[] bytesForPrefix(final Ipv6Prefix prefix) {
  55                 final String p = prefix.getValue();
  56                 final int sep = p.indexOf('/');
  57                 final InetAddress a = InetAddresses.forString(p.substring(0, sep));
  58                 Preconditions.checkArgument(a instanceof Inet6Address);
  59                 final byte[] bytes = a.getAddress();
  60                 return Bytes.concat(bytes, new byte[] { Byte.valueOf(p.substring(sep + 1, p.length())) });
  61         }
  62
  63         public static Ipv6Prefix prefixForBytes(final byte[] bytes, final int length) {
  64                 Preconditions.checkArgument(length <= bytes.length * Byte.SIZE);
  65                 final byte[] tmp = Arrays.copyOfRange(bytes, 0, IPV6_LENGTH);
  66                 final InetAddress a = getAddress(tmp);
  67                 return new Ipv6Prefix(InetAddresses.toAddrString(a) + '/' + length);
  68         }
  69
  70         public static List<Ipv6Prefix> prefixListForBytes(final byte[] bytes) {
  71                 if (bytes.length == 0) {
  72                         return Collections.emptyList();
  73                 }
  74
  75                 final List<Ipv6Prefix> list = Lists.newArrayList();
  76                 int byteOffset = 0;
  77                 while (byteOffset < bytes.length) {
  78                         final int bitLength = UnsignedBytes.toInt(ByteArray.subByte(bytes, byteOffset, 1)[0]);
  79                         byteOffset += 1;
  80                         final int byteCount = (bitLength % Byte.SIZE != 0) ? (bitLength / Byte.SIZE) + 1 : bitLength / Byte.SIZE;
  81                         list.add(prefixForBytes(ByteArray.subByte(bytes, byteOffset, byteCount), bitLength));
  82                         byteOffset += byteCount;
  83                 }
  84                 return list;
  85         }
  86 }