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.UnknownHostException;
  12 import java.util.Collections;
  13 import java.util.List;
  14
  15 import org.opendaylight.protocol.util.ByteArray;
  16 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv6Address;
  17 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv6Prefix;
  18
  19 import com.google.common.base.Preconditions;
  20 import com.google.common.collect.Lists;
  21 import com.google.common.primitives.UnsignedBytes;
  22
  23 /**
  24  * Util class for creating generated Ipv6Address.
  25  */
  26 public class Ipv6Util {
  27
  28         public static Ipv6Address addressForBytes(final byte[] bytes) {
  29                 try {
  30                         return new Ipv6Address(Inet6Address.getByAddress(bytes).toString());
  31                 } catch (final UnknownHostException e) {
  32                         throw new IllegalArgumentException(e.getMessage());
  33                 }
  34         }
  35
  36         public static Ipv6Prefix prefixForBytes(final byte[] bytes, final int length) {
  37                 Preconditions.checkArgument(length <= bytes.length * 8);
  38                 return new Ipv6Prefix(addressForBytes(bytes).toString() + "/" + length);
  39         }
  40
  41         public static List<Ipv6Prefix> prefixListForBytes(final byte[] bytes) {
  42                 if (bytes.length == 0)
  43                         return Collections.emptyList();
  44
  45                 final List<Ipv6Prefix> list = Lists.newArrayList();
  46                 int byteOffset = 0;
  47                 while (byteOffset < bytes.length) {
  48                         final int bitLength = UnsignedBytes.toInt(ByteArray.subByte(bytes, byteOffset, 1)[0]);
  49                         byteOffset += 1;
  50                         final int byteCount = (bitLength % 8 != 0) ? (bitLength / 8) + 1 : bitLength / 8;
  51                         list.add(prefixForBytes(ByteArray.subByte(bytes, byteOffset, byteCount), bitLength));
  52                         byteOffset += byteCount;
  53                 }
  54                 return list;
  55         }
  56 }