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.UnsignedBytes;
  25
  26 /**
  27  * Util class for creating generated Ipv6Address.
  28  */
  29 public class Ipv6Util {
  30
  31         public static Ipv6Address addressForBytes(final byte[] bytes) {
  32                 try {
  33                         return new Ipv6Address(InetAddresses.toAddrString(Inet6Address.getByAddress(bytes)));
  34                 } catch (final UnknownHostException e) {
  35                         throw new IllegalArgumentException(e.getMessage());
  36                 }
  37         }
  38
  39         public static byte[] bytesForAddress(final Ipv6Address address) {
  40                 Inet6Address a;
  41                 try {
  42                         a = (Inet6Address) InetAddress.getByName(address.getValue());
  43                 } catch (final UnknownHostException e) {
  44                         throw new IllegalArgumentException(e.getMessage());
  45                 }
  46                 return a.getAddress();
  47         }
  48
  49         public static Ipv6Prefix prefixForBytes(final byte[] bytes, final int length) {
  50                 Preconditions.checkArgument(length <= bytes.length * 8);
  51                 byte[] tmp = Arrays.copyOfRange(bytes, 0, 16);
  52                 InetAddress a = null;
  53                 try {
  54                         a = InetAddress.getByAddress(tmp);
  55                 } catch (UnknownHostException e) {
  56                         throw new IllegalArgumentException(e.getMessage());
  57                 }
  58                 return new Ipv6Prefix(InetAddresses.toAddrString(a) + "/" + length);
  59         }
  60
  61         public static List<Ipv6Prefix> prefixListForBytes(final byte[] bytes) {
  62                 if (bytes.length == 0)
  63                         return Collections.emptyList();
  64
  65                 final List<Ipv6Prefix> list = Lists.newArrayList();
  66                 int byteOffset = 0;
  67                 while (byteOffset < bytes.length) {
  68                         final int bitLength = UnsignedBytes.toInt(ByteArray.subByte(bytes, byteOffset, 1)[0]);
  69                         byteOffset += 1;
  70                         final int byteCount = (bitLength % 8 != 0) ? (bitLength / 8) + 1 : bitLength / 8;
  71                         list.add(prefixForBytes(ByteArray.subByte(bytes, byteOffset, byteCount), bitLength));
  72                         byteOffset += byteCount;
  73                 }
  74                 return list;
  75         }
  76 }