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.EROSubobjectHandlerRegistry;
  13 import org.opendaylight.protocol.pcep.spi.EROSubobjectSerializer;
  14 import org.opendaylight.protocol.pcep.spi.ObjectParser;
  15 import org.opendaylight.protocol.pcep.spi.ObjectSerializer;
  16 import org.opendaylight.protocol.pcep.spi.PCEPDeserializerException;
  17 import org.opendaylight.protocol.util.ByteArray;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.explicit.route.object.ero.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 AbstractEROWithSubobjectsParser implements ObjectParser, ObjectSerializer {
  26
  27         private static final Logger LOG = LoggerFactory.getLogger(AbstractEROWithSubobjectsParser.class);
  28
  29         private static final int SUB_TYPE_FLAG_F_LENGTH = 1;
  30         private static final int SUB_LENGTH_F_LENGTH = 1;
  31         private static final int SUB_HEADER_LENGTH = SUB_TYPE_FLAG_F_LENGTH + SUB_LENGTH_F_LENGTH;
  32
  33         private static final int TYPE_FLAG_F_OFFSET = 0;
  34         private static final int LENGTH_F_OFFSET = TYPE_FLAG_F_OFFSET + SUB_TYPE_FLAG_F_LENGTH;
  35         private static final int SO_CONTENTS_OFFSET = LENGTH_F_OFFSET + SUB_LENGTH_F_LENGTH;
  36
  37         private final EROSubobjectHandlerRegistry subobjReg;
  38
  39         protected AbstractEROWithSubobjectsParser(final EROSubobjectHandlerRegistry subobjReg) {
  40                 this.subobjReg = Preconditions.checkNotNull(subobjReg);
  41         }
  42
  43         protected List<Subobjects> parseSubobjects(final byte[] bytes) throws PCEPDeserializerException {
  44                 if (bytes == null) {
  45                         throw new IllegalArgumentException("Byte array is mandatory.");
  46                 }
  47
  48                 boolean loose = false;
  49                 int type;
  50                 byte[] soContentsBytes;
  51                 int length;
  52                 int offset = 0;
  53
  54                 final List<Subobjects> subs = Lists.newArrayList();
  55
  56                 while (offset < bytes.length) {
  57
  58                         loose = ((bytes[offset + TYPE_FLAG_F_OFFSET] & (1 << 7)) != 0) ? true : false;
  59                         length = ByteArray.bytesToInt(ByteArray.subByte(bytes, offset + LENGTH_F_OFFSET, SUB_LENGTH_F_LENGTH));
  60
  61                         type = (bytes[offset + TYPE_FLAG_F_OFFSET] & 0xff) & ~(1 << 7);
  62
  63                         if (length > bytes.length - offset) {
  64                                 throw new PCEPDeserializerException("Wrong length specified. Passed: " + length + "; Expected: <= "
  65                                                 + (bytes.length - offset));
  66                         }
  67
  68                         soContentsBytes = new byte[length - SO_CONTENTS_OFFSET];
  69                         System.arraycopy(bytes, offset + SO_CONTENTS_OFFSET, soContentsBytes, 0, length - SO_CONTENTS_OFFSET);
  70
  71                         LOG.debug("Attempt to parse subobject from bytes: {}", ByteArray.bytesToHexString(soContentsBytes));
  72                         final Subobjects sub = this.subobjReg.getSubobjectParser(type).parseSubobject(soContentsBytes, loose);
  73                         LOG.debug("Subobject was parsed. {}", sub);
  74
  75                         subs.add(sub);
  76
  77                         offset += length;
  78                 }
  79                 return subs;
  80         }
  81
  82         protected final byte[] serializeSubobject(final List<Subobjects> subobjects) {
  83
  84                 final List<byte[]> result = Lists.newArrayList();
  85
  86                 int finalLength = 0;
  87
  88                 for (final Subobjects subobject : subobjects) {
  89
  90                         final EROSubobjectSerializer serializer = this.subobjReg.getSubobjectSerializer(subobject.getSubobjectType());
  91
  92                         final byte[] bytes = serializer.serializeSubobject(subobject);
  93
  94                         finalLength += bytes.length;
  95                         result.add(bytes);
  96                 }
  97
  98                 final byte[] resultBytes = new byte[finalLength];
  99                 int byteOffset = 0;
 100                 for (final byte[] b : result) {
 101                         System.arraycopy(b, 0, resultBytes, byteOffset, b.length);
 102                         byteOffset += b.length;
 103                 }
 104                 return resultBytes;
 105         }
 106 }