openflow-protocol-impl/src/main/java/org/opendaylight/openflowjava/protocol/impl/util/MatchDeserializer.java

   1 /*
   2  * Copyright (c) 2013 Pantheon Technologies s.r.o. 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
   9 package org.opendaylight.openflowjava.protocol.impl.util;
  10
  11 import io.netty.buffer.ByteBuf;
  12
  13 import org.opendaylight.openflowjava.protocol.api.extensibility.DeserializerRegistry;
  14 import org.opendaylight.openflowjava.protocol.api.extensibility.DeserializerRegistryInjector;
  15 import org.opendaylight.openflowjava.protocol.api.extensibility.OFDeserializer;
  16 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.common.types.rev130731.StandardMatchType;
  17 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev130731.OxmMatchType;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev130731.match.grouping.Match;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev130731.match.grouping.MatchBuilder;
  20
  21 /**
  22  * Deserializes ofp_match (OpenFlow v1.3) and its oxm_fields structures
  23  * @author timotej.kubas
  24  * @author michal.polkorab
  25  */
  26 public class MatchDeserializer implements OFDeserializer<Match>,
  27         DeserializerRegistryInjector {
  28
  29     private DeserializerRegistry registry;
  30
  31     @Override
  32     public Match deserialize(ByteBuf input) {
  33         if (input.readableBytes() > 0) {
  34             MatchBuilder builder = new MatchBuilder();
  35             int type = input.readUnsignedShort();
  36             int length = input.readUnsignedShort();
  37             switch (type) {
  38             case 0:
  39                 builder.setType(StandardMatchType.class);
  40                 break;
  41             case 1:
  42                 builder.setType(OxmMatchType.class);
  43                 break;
  44             default:
  45                 break;
  46             }
  47             builder.setMatchEntries(DecodingUtils.deserializeMatchEntries(
  48                     length - 2 * EncodeConstants.SIZE_OF_SHORT_IN_BYTES, input, registry));
  49             int paddingRemainder = length % EncodeConstants.PADDING;
  50             if (paddingRemainder != 0) {
  51                 input.skipBytes(EncodeConstants.PADDING - paddingRemainder);
  52             }
  53             return builder.build();
  54         }
  55         return null;
  56     }
  57
  58     @Override
  59     public void injectDeserializerRegistry(DeserializerRegistry deserializerRegistry) {
  60         this.registry = deserializerRegistry;
  61     }
  62 }