pcep/impl/src/main/java/org/opendaylight/protocol/pcep/impl/subobject/EROIPv4PrefixSubobjectParser.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.util.ByteArray;
  11 import org.opendaylight.protocol.concepts.IPv4Address;
  12 import org.opendaylight.protocol.concepts.IPv4Prefix;
  13 import org.opendaylight.protocol.concepts.Prefix;
  14 import org.opendaylight.protocol.pcep.PCEPDeserializerException;
  15 import org.opendaylight.protocol.pcep.subobject.EROIPPrefixSubobject;
  16 import org.opendaylight.protocol.pcep.subobject.ExplicitRouteSubobject;
  17 import com.google.common.primitives.UnsignedBytes;
  18
  19 /**
  20  * Parser for {@link org.opendaylight.protocol.pcep.subobject.EROIPPrefixSubobject
  21  * EROIPPrefixSubobject<IPv4Prefix>}
  22  */
  23 public class EROIPv4PrefixSubobjectParser {
  24         public static final int IP_F_LENGTH = 4;
  25         public static final int PREFIX_F_LENGTH = 1;
  26
  27         public static final int IP_F_OFFSET = 0;
  28         public static final int PREFIX_F_OFFSET = IP_F_OFFSET + IP_F_LENGTH;
  29
  30         public static final int CONTENT_LENGTH = PREFIX_F_OFFSET + PREFIX_F_LENGTH + 1; //added reserved field of size 1 byte
  31
  32         public static EROIPPrefixSubobject<IPv4Prefix> parse(byte[] soContentsBytes, boolean loose) throws PCEPDeserializerException {
  33                 if (soContentsBytes == null || soContentsBytes.length == 0)
  34                         throw new IllegalArgumentException("Array of bytes is mandatory. Can't be null or empty.");
  35                 if (soContentsBytes.length != CONTENT_LENGTH)
  36                         throw new PCEPDeserializerException("Wrong length of array of bytes. Passed: " + soContentsBytes.length + "; Expected: " + CONTENT_LENGTH + ".");
  37
  38                 final IPv4Address address = new IPv4Address(ByteArray.subByte(soContentsBytes, IP_F_OFFSET, IP_F_LENGTH));
  39                 final int length = UnsignedBytes.toInt(soContentsBytes[PREFIX_F_OFFSET]);
  40
  41                 return new EROIPPrefixSubobject<IPv4Prefix>(new IPv4Prefix(address, length), loose);
  42         }
  43
  44         public static byte[] put(ExplicitRouteSubobject objToSerialize) {
  45                 if (!(objToSerialize instanceof EROIPPrefixSubobject))
  46                         throw new IllegalArgumentException("Unknown ExplicitRouteSubobject instance. Passed " + objToSerialize.getClass()
  47                                         + ". Needed EROIPPrefixSubobject.");
  48
  49                 final EROIPPrefixSubobject<?> specObj = (EROIPPrefixSubobject<?>) objToSerialize;
  50                 final Prefix<?> prefix = specObj.getPrefix();
  51
  52                 if (!(prefix instanceof IPv4Prefix))
  53                         throw new IllegalArgumentException("Unknown AbstractPrefix instance. Passed " + prefix.getClass() + ". Needed IPv4Prefix.");
  54
  55                 final byte[] retBytes = new byte[CONTENT_LENGTH];
  56                 ByteArray.copyWhole(prefix.getAddress().getAddress(), retBytes, IP_F_OFFSET);
  57                 retBytes[PREFIX_F_OFFSET] = ByteArray.intToBytes(prefix.getLength())[Integer.SIZE / Byte.SIZE - 1];
  58
  59                 return retBytes;
  60         }
  61 }