pcep/impl/src/main/java/org/opendaylight/protocol/pcep/impl/object/PCEPExcludeRouteObjectParser.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.object;
   9
  10 import java.util.Arrays;
  11 import java.util.BitSet;
  12 import java.util.List;
  13
  14 import org.opendaylight.protocol.util.ByteArray;
  15 import org.opendaylight.protocol.pcep.PCEPDeserializerException;
  16 import org.opendaylight.protocol.pcep.PCEPDocumentedException;
  17 import org.opendaylight.protocol.pcep.PCEPObject;
  18 import org.opendaylight.protocol.pcep.impl.PCEPObjectParser;
  19 import org.opendaylight.protocol.pcep.impl.PCEPXROSubobjectParser;
  20 import org.opendaylight.protocol.pcep.object.PCEPExcludeRouteObject;
  21 import org.opendaylight.protocol.pcep.subobject.ExcludeRouteSubobject;
  22
  23 /**
  24  * Parser for {@link org.opendaylight.protocol.pcep.object.PCEPExcludeRouteObject
  25  * PCEPExcludeRouteObject}
  26  */
  27 public class PCEPExcludeRouteObjectParser implements PCEPObjectParser {
  28
  29         /*
  30          * lengths of fields in bytes
  31          */
  32         public final int FLAGS_F_LENGTH = 2;
  33
  34         /*
  35          * offsets of fields in bytes
  36          */
  37         public final int FLAGS_F_OFFSET = 2; // added reserved 2 bytes
  38         public final int SO_F_OFFSET = this.FLAGS_F_OFFSET + this.FLAGS_F_LENGTH;
  39
  40         /*
  41          * Flag offsets inside flags field in bits
  42          */
  43         public final int F_FLAG_OFFSET = 15;
  44
  45         @Override
  46         public PCEPObject parse(byte[] bytes, boolean processed, boolean ignored) throws PCEPDeserializerException, PCEPDocumentedException {
  47                 if (bytes == null || bytes.length == 0)
  48                         throw new IllegalArgumentException("Byte array is mandatory. Can't be null or empty.");
  49
  50                 final BitSet flags = ByteArray.bytesToBitSet(Arrays.copyOfRange(bytes, this.FLAGS_F_OFFSET, this.FLAGS_F_LENGTH));
  51
  52                 final List<ExcludeRouteSubobject> subobjects = PCEPXROSubobjectParser.parse(ByteArray.cutBytes(bytes, this.SO_F_OFFSET));
  53                 if (subobjects.isEmpty())
  54                         throw new PCEPDeserializerException("Empty Exclude Route Object.");
  55
  56                 return new PCEPExcludeRouteObject(subobjects, flags.get(this.F_FLAG_OFFSET), processed, ignored);
  57         }
  58
  59         @Override
  60         public byte[] put(PCEPObject obj) {
  61                 if (!(obj instanceof PCEPExcludeRouteObject))
  62                         throw new IllegalArgumentException("Wrong instance of PCEPObject. Passed " + obj.getClass() + ". Needed PCEPExcludeRouteObject.");
  63
  64                 assert !(((PCEPExcludeRouteObject) obj).getSubobjects().isEmpty()) : "Empty Exclude Route Object.";
  65
  66                 final byte[] subObjsBytes = PCEPXROSubobjectParser.put(((PCEPExcludeRouteObject) obj).getSubobjects());
  67                 final byte[] retBytes = new byte[this.SO_F_OFFSET + subObjsBytes.length];
  68                 final BitSet flags = new BitSet(this.FLAGS_F_LENGTH * Byte.SIZE);
  69                 flags.set(this.F_FLAG_OFFSET, ((PCEPExcludeRouteObject) obj).isFail());
  70                 ByteArray.copyWhole(ByteArray.bitSetToBytes(flags, this.FLAGS_F_LENGTH), retBytes, this.FLAGS_F_OFFSET);
  71                 ByteArray.copyWhole(subObjsBytes, retBytes, this.SO_F_OFFSET);
  72
  73                 return retBytes;
  74         }
  75
  76 }