pcep/impl/src/main/java/org/opendaylight/protocol/pcep/impl/object/AbstractRROWithSubobjectsParser.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.List;
  11
  12 import org.opendaylight.protocol.pcep.spi.ObjectParser;
  13 import org.opendaylight.protocol.pcep.spi.ObjectSerializer;
  14 import org.opendaylight.protocol.pcep.spi.PCEPDeserializerException;
  15 import org.opendaylight.protocol.pcep.spi.RROSubobjectHandlerRegistry;
  16 import org.opendaylight.protocol.pcep.spi.RROSubobjectSerializer;
  17 import org.opendaylight.protocol.util.ByteArray;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.reported.route.object.rro.Subobjects;
  19 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21
  22 import com.google.common.base.Preconditions;
  23 import com.google.common.collect.Lists;
  24
  25 public abstract class AbstractRROWithSubobjectsParser implements ObjectParser, ObjectSerializer {
  26
  27         private static final Logger LOG = LoggerFactory.getLogger(AbstractRROWithSubobjectsParser.class);
  28
  29         private static final int SUB_TYPE_FLAG_F_LENGTH = 1;
  30         private static final int SUB_LENGTH_F_LENGTH = 1;
  31
  32         private static final int TYPE_FLAG_F_OFFSET = 0;
  33         private static final int LENGTH_F_OFFSET = TYPE_FLAG_F_OFFSET + SUB_TYPE_FLAG_F_LENGTH;
  34         private static final int SO_CONTENTS_OFFSET = LENGTH_F_OFFSET + SUB_LENGTH_F_LENGTH;
  35
  36         private final RROSubobjectHandlerRegistry subobjReg;
  37
  38         protected AbstractRROWithSubobjectsParser(final RROSubobjectHandlerRegistry subobjReg) {
  39                 this.subobjReg = Preconditions.checkNotNull(subobjReg);
  40         }
  41
  42         protected List<Subobjects> parseSubobjects(final byte[] bytes) throws PCEPDeserializerException {
  43                 if (bytes == null) {
  44                         throw new IllegalArgumentException("Byte array is mandatory.");
  45                 }
  46
  47                 int type;
  48
  49                 byte[] soContentsBytes;
  50                 int length;
  51                 int offset = 0;
  52
  53                 final List<Subobjects> subs = Lists.newArrayList();
  54
  55                 while (offset < bytes.length) {
  56
  57                         length = ByteArray.bytesToInt(ByteArray.subByte(bytes, offset + LENGTH_F_OFFSET, SUB_LENGTH_F_LENGTH));
  58
  59                         type = bytes[offset + TYPE_FLAG_F_OFFSET];
  60
  61                         if (length > bytes.length - offset) {
  62                                 throw new PCEPDeserializerException("Wrong length specified. Passed: " + length + "; Expected: <= "
  63                                                 + (bytes.length - offset));
  64                         }
  65
  66                         soContentsBytes = new byte[length - SO_CONTENTS_OFFSET];
  67                         System.arraycopy(bytes, offset + SO_CONTENTS_OFFSET, soContentsBytes, 0, length - SO_CONTENTS_OFFSET);
  68
  69                         LOG.debug("Attempt to parse subobject from bytes: {}", ByteArray.bytesToHexString(soContentsBytes));
  70                         final Subobjects sub = this.subobjReg.getSubobjectParser(type).parseSubobject(soContentsBytes);
  71                         LOG.debug("Subobject was parsed. {}", sub);
  72
  73                         subs.add(sub);
  74
  75                         offset += length;
  76                 }
  77                 return subs;
  78         }
  79
  80         protected final byte[] serializeSubobject(final List<Subobjects> subobjects) {
  81
  82                 final List<byte[]> result = Lists.newArrayList();
  83
  84                 int finalLength = 0;
  85
  86                 for (final Subobjects subobject : subobjects) {
  87
  88                         final RROSubobjectSerializer serializer = this.subobjReg.getSubobjectSerializer(subobject.getSubobjectType());
  89
  90                         final byte[] bytes = serializer.serializeSubobject(subobject);
  91                         finalLength += bytes.length;
  92                         result.add(bytes);
  93                 }
  94
  95                 final byte[] resultBytes = new byte[finalLength];
  96                 int byteOffset = 0;
  97                 for (final byte[] b : result) {
  98                         System.arraycopy(b, 0, resultBytes, byteOffset, b.length);
  99                         byteOffset += b.length;
 100                 }
 101                 return resultBytes;
 102         }
 103 }