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.PCEPDeserializerException;
  13 import org.opendaylight.protocol.pcep.spi.EROSubobjectHandlerRegistry;
  14 import org.opendaylight.protocol.pcep.spi.EROSubobjectSerializer;
  15 import org.opendaylight.protocol.pcep.spi.ObjectParser;
  16 import org.opendaylight.protocol.pcep.spi.ObjectSerializer;
  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.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 logger = 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         public static final int TYPE_FLAG_F_OFFSET = 0;
  34         public static final int LENGTH_F_OFFSET = TYPE_FLAG_F_OFFSET + SUB_TYPE_FLAG_F_LENGTH;
  35         public static final int SO_CONTENTS_OFFSET = LENGTH_F_OFFSET + SUB_LENGTH_F_LENGTH;
  36
  37         protected static final int PADDED_TO = 4;
  38
  39         private final EROSubobjectHandlerRegistry subobjReg;
  40
  41         protected AbstractEROWithSubobjectsParser(final EROSubobjectHandlerRegistry subobjReg) {
  42                 this.subobjReg = Preconditions.checkNotNull(subobjReg);
  43         }
  44
  45         protected List<Subobjects> parseSubobjects(final byte[] bytes) throws PCEPDeserializerException {
  46                 if (bytes == null) {
  47                         throw new IllegalArgumentException("Byte array is mandatory.");
  48                 }
  49
  50                 boolean loose_flag = false;
  51                 int type;
  52
  53                 byte[] soContentsBytes;
  54                 int length;
  55                 int offset = 0;
  56
  57                 final List<Subobjects> subs = Lists.newArrayList();
  58
  59                 while (offset < bytes.length) {
  60
  61                         loose_flag = ((bytes[offset + TYPE_FLAG_F_OFFSET] & (1 << 7)) != 0) ? true : false;
  62                         length = ByteArray.bytesToInt(ByteArray.subByte(bytes, offset + LENGTH_F_OFFSET, SUB_LENGTH_F_LENGTH));
  63
  64                         type = (bytes[offset + TYPE_FLAG_F_OFFSET] & 0xff) & ~(1 << 7);
  65
  66                         if (length > bytes.length - offset) {
  67                                 throw new PCEPDeserializerException("Wrong length specified. Passed: " + length + "; Expected: <= "
  68                                                 + (bytes.length - offset));
  69                         }
  70
  71                         soContentsBytes = new byte[length - SO_CONTENTS_OFFSET];
  72                         System.arraycopy(bytes, offset + SO_CONTENTS_OFFSET, soContentsBytes, 0, length - SO_CONTENTS_OFFSET);
  73
  74                         logger.debug("Attempt to parse subobject from bytes: {}", ByteArray.bytesToHexString(soContentsBytes));
  75                         final Subobjects sub = this.subobjReg.getSubobjectParser(type).parseSubobject(soContentsBytes, loose_flag);
  76                         logger.debug("Subobject was parsed. {}", sub);
  77
  78                         subs.add(sub);
  79
  80                         offset += length;
  81                 }
  82                 return subs;
  83         }
  84
  85         protected final byte[] serializeSubobject(final List<Subobjects> subobjects) {
  86
  87                 final List<byte[]> result = Lists.newArrayList();
  88
  89                 int finalLength = 0;
  90
  91                 for (final Subobjects subobject : subobjects) {
  92
  93                         final EROSubobjectSerializer serializer = this.subobjReg.getSubobjectSerializer(subobject);
  94
  95                         final byte[] valueBytes = serializer.serializeSubobject(subobject);
  96
  97                         final byte[] bytes = new byte[SUB_HEADER_LENGTH + valueBytes.length];
  98
  99                         final byte typeBytes = (byte) (ByteArray.cutBytes(ByteArray.intToBytes(serializer.getType()), (Integer.SIZE / 8) - 1)[0] | (subobject.isLoose() ? 1 << 7
 100                                         : 0));
 101                         final byte lengthBytes = ByteArray.cutBytes(ByteArray.intToBytes(valueBytes.length), (Integer.SIZE / 8) - 1)[0];
 102
 103                         bytes[0] = typeBytes;
 104                         bytes[1] = lengthBytes;
 105                         System.arraycopy(valueBytes, 0, bytes, SUB_HEADER_LENGTH, valueBytes.length);
 106
 107                         finalLength += bytes.length;
 108                         result.add(bytes);
 109                 }
 110
 111                 final byte[] resultBytes = new byte[finalLength];
 112                 int byteOffset = 0;
 113                 for (final byte[] b : result) {
 114                         System.arraycopy(b, 0, resultBytes, byteOffset, b.length);
 115                         byteOffset += b.length;
 116                 }
 117                 return resultBytes;
 118         }
 119 }