pcep/impl/src/main/java/org/opendaylight/protocol/pcep/impl/object/AbstractEROWithSubobjectsParser.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.EROSubobjectRegistry;
  13 import org.opendaylight.protocol.pcep.spi.ObjectParser;
  14 import org.opendaylight.protocol.pcep.spi.ObjectSerializer;
  15 import org.opendaylight.protocol.pcep.spi.PCEPDeserializerException;
  16 import org.opendaylight.protocol.util.ByteArray;
  17 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.ero.Subobject;
  18 import org.slf4j.Logger;
  19 import org.slf4j.LoggerFactory;
  20
  21 import com.google.common.base.Preconditions;
  22 import com.google.common.collect.Lists;
  23
  24 public abstract class AbstractEROWithSubobjectsParser implements ObjectParser, ObjectSerializer {
  25
  26         private static final Logger LOG = LoggerFactory.getLogger(AbstractEROWithSubobjectsParser.class);
  27
  28         private static final int SUB_TYPE_FLAG_F_LENGTH = 1;
  29         private static final int SUB_LENGTH_F_LENGTH = 1;
  30
  31         private static final int TYPE_FLAG_F_OFFSET = 0;
  32         private static final int LENGTH_F_OFFSET = TYPE_FLAG_F_OFFSET + SUB_TYPE_FLAG_F_LENGTH;
  33         private static final int SO_CONTENTS_OFFSET = LENGTH_F_OFFSET + SUB_LENGTH_F_LENGTH;
  34
  35         private final EROSubobjectRegistry subobjReg;
  36
  37         protected AbstractEROWithSubobjectsParser(final EROSubobjectRegistry subobjReg) {
  38                 this.subobjReg = Preconditions.checkNotNull(subobjReg);
  39         }
  40
  41         protected List<Subobject> parseSubobjects(final byte[] bytes) throws PCEPDeserializerException {
  42                 if (bytes == null) {
  43                         throw new IllegalArgumentException("Byte array is mandatory.");
  44                 }
  45
  46                 boolean loose = false;
  47                 int type;
  48                 byte[] soContentsBytes;
  49                 int length;
  50                 int offset = 0;
  51
  52                 final List<Subobject> subs = Lists.newArrayList();
  53
  54                 while (offset < bytes.length) {
  55
  56                         loose = ((bytes[offset + TYPE_FLAG_F_OFFSET] & (1 << 7)) != 0) ? true : false;
  57                         length = ByteArray.bytesToInt(ByteArray.subByte(bytes, offset + LENGTH_F_OFFSET, SUB_LENGTH_F_LENGTH));
  58
  59                         type = (bytes[offset + TYPE_FLAG_F_OFFSET] & 0xff) & ~(1 << 7);
  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 Subobject sub = this.subobjReg.parseSubobject(type, soContentsBytes, loose);
  71                         if (sub == null) {
  72                                 LOG.warn("Unknown subobject type: {}. Ignoring subobject.", type);
  73                         } else {
  74                                 LOG.debug("Subobject was parsed. {}", sub);
  75                                 subs.add(sub);
  76                         }
  77                         offset += length;
  78                 }
  79                 return subs;
  80         }
  81
  82         protected final byte[] serializeSubobject(final List<Subobject> subobjects) {
  83                 final List<byte[]> result = Lists.newArrayList();
  84                 int finalLength = 0;
  85                 for (final Subobject subobject : subobjects) {
  86                         final byte[] bytes = this.subobjReg.serializeSubobject(subobject);
  87                         if (bytes == null) {
  88                                 LOG.warn("Could not find serializer for subobject type: {}. Skipping subobject.", subobject.getSubobjectType());
  89                         } else  {
  90                                 finalLength += bytes.length;
  91                                 result.add(bytes);
  92                         }
  93                 }
  94                 final byte[] resultBytes = new byte[finalLength];
  95                 int byteOffset = 0;
  96                 for (final byte[] b : result) {
  97                         System.arraycopy(b, 0, resultBytes, byteOffset, b.length);
  98                         byteOffset += b.length;
  99                 }
 100                 return resultBytes;
 101         }
 102 }