pcep/impl/src/main/java/org/opendaylight/protocol/pcep/impl/object/PCEPOpenObjectParser.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
   9 package org.opendaylight.protocol.pcep.impl.object;
  10
  11 import org.opendaylight.protocol.pcep.PCEPDeserializerException;
  12 import org.opendaylight.protocol.pcep.PCEPDocumentedException;
  13 import org.opendaylight.protocol.pcep.PCEPErrors;
  14 import org.opendaylight.protocol.pcep.impl.Util;
  15 import org.opendaylight.protocol.pcep.spi.AbstractObjectParser;
  16 import org.opendaylight.protocol.pcep.spi.HandlerRegistry;
  17 import org.opendaylight.protocol.util.ByteArray;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.LspDbVersionTlv;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Object;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.ObjectHeader;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.OfListTlv;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.OpenObject;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.PredundancyGroupIdTlv;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.ProtocolVersion;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.StatefulCapabilityTlv;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Tlv;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.message.open.message.OpenBuilder;
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.Tlvs;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.TlvsBuilder;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.tlvs.LspDbVersionBuilder;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.tlvs.OfListBuilder;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.tlvs.PredundancyGroupIdBuilder;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.open.object.tlvs.StatefulBuilder;
  34
  35 import com.google.common.primitives.UnsignedBytes;
  36
  37 /**
  38  * Parser for {@link OpenObject}
  39  */
  40
  41 public class PCEPOpenObjectParser extends AbstractObjectParser<OpenBuilder> {
  42
  43         public static final int CLASS = 1;
  44
  45         public static final int TYPE = 1;
  46
  47         /*
  48          * lengths of fields in bytes
  49          */
  50         public static final int VER_FLAGS_MF_LENGTH = 1; // multi-field
  51         public static final int KEEPALIVE_F_LENGTH = 1;
  52         public static final int DEAD_TIMER_LENGTH = 1;
  53         public static final int SID_F_LENGTH = 1;
  54
  55         /*
  56          * lengths of subfields inside multi-field in bits
  57          */
  58         public static final int VERSION_SF_LENGTH = 3;
  59         public static final int FLAGS_SF_LENGTH = 5;
  60
  61         /*
  62          * offsets of field in bytes
  63          */
  64
  65         public static final int VER_FLAGS_MF_OFFSET = 0;
  66         public static final int KEEPALIVE_F_OFFSET = VER_FLAGS_MF_OFFSET + VER_FLAGS_MF_LENGTH;
  67         public static final int DEAD_TIMER_OFFSET = KEEPALIVE_F_OFFSET + KEEPALIVE_F_LENGTH;
  68         public static final int SID_F_OFFSET = DEAD_TIMER_OFFSET + DEAD_TIMER_LENGTH;
  69         public static final int TLVS_OFFSET = SID_F_OFFSET + SID_F_LENGTH;
  70
  71         /*
  72          * offsets of subfields inside multi-field in bits
  73          */
  74
  75         public static final int VERSION_SF_OFFSET = 0;
  76         public static final int FLAGS_SF_OFFSET = VERSION_SF_LENGTH + VERSION_SF_OFFSET;
  77
  78         private static final int PCEP_VERSION = 1;
  79
  80         public PCEPOpenObjectParser(final HandlerRegistry registry) {
  81                 super(registry);
  82         }
  83
  84         @Override
  85         public OpenObject parseObject(final ObjectHeader header, final byte[] bytes) throws PCEPDeserializerException, PCEPDocumentedException {
  86                 if (bytes == null || bytes.length == 0)
  87                         throw new IllegalArgumentException("Array of bytes is mandatory. Can't be null or empty.");
  88
  89                 final int versionValue = ByteArray.copyBitsRange(bytes[VER_FLAGS_MF_OFFSET], VERSION_SF_OFFSET, VERSION_SF_LENGTH);
  90
  91                 if (versionValue != PCEP_VERSION)
  92                         throw new PCEPDocumentedException("Unsupported PCEP version " + versionValue, PCEPErrors.PCEP_VERSION_NOT_SUPPORTED);
  93
  94                 final OpenBuilder builder = new OpenBuilder();
  95
  96                 parseTlvs(builder, ByteArray.cutBytes(bytes, TLVS_OFFSET));
  97
  98                 builder.setVersion(new ProtocolVersion((short) versionValue));
  99                 builder.setProcessingRule(header.isProcessingRule());
 100                 builder.setIgnore(header.isIgnore());
 101                 builder.setDeadTimer((short) UnsignedBytes.toInt(bytes[DEAD_TIMER_OFFSET]));
 102                 builder.setKeepalive((short) UnsignedBytes.toInt(bytes[KEEPALIVE_F_OFFSET]));
 103                 builder.setSessionId((short) UnsignedBytes.toInt(bytes[SID_F_OFFSET]));
 104                 return builder.build();
 105         }
 106
 107         @Override
 108         public void addTlv(final OpenBuilder builder, final Tlv tlv) {
 109                 final TlvsBuilder tbuilder = new TlvsBuilder();
 110                 if (tlv instanceof OfListTlv)
 111                         tbuilder.setOfList(new OfListBuilder().setCodes(((OfListTlv) tlv).getCodes()).build());
 112                 else if (tlv instanceof StatefulCapabilityTlv)
 113                         tbuilder.setStateful(new StatefulBuilder().setFlags(((StatefulCapabilityTlv) tlv).getFlags()).build());
 114                 else if (tlv instanceof PredundancyGroupIdTlv)
 115                         tbuilder.setPredundancyGroupId(new PredundancyGroupIdBuilder().setIdentifier(((PredundancyGroupIdTlv) tlv).getIdentifier()).build());
 116                 else if (tlv instanceof LspDbVersionTlv)
 117                         tbuilder.setLspDbVersion(new LspDbVersionBuilder().build());
 118                 builder.setTlvs(tbuilder.build());
 119         }
 120
 121         @Override
 122         public byte[] serializeObject(final Object object) {
 123                 if (!(object instanceof OpenObject))
 124                         throw new IllegalArgumentException("Wrong instance of PCEPObject. Passed " + object.getClass() + ". Needed OpenObject.");
 125                 final OpenObject open = (OpenObject) object;
 126
 127                 final byte versionFlagMF = (byte) (PCEP_VERSION << (Byte.SIZE - VERSION_SF_LENGTH));
 128
 129                 final byte[] tlvs = serializeTlvs(open.getTlvs());
 130
 131                 final byte[] bytes = new byte[TLVS_OFFSET + tlvs.length + Util.getPadding(TLVS_OFFSET + tlvs.length, PADDED_TO)];
 132
 133                 bytes[VER_FLAGS_MF_OFFSET] = versionFlagMF;
 134                 bytes[KEEPALIVE_F_OFFSET] = ByteArray.shortToBytes(open.getKeepalive())[1];
 135                 bytes[DEAD_TIMER_OFFSET] = ByteArray.shortToBytes(open.getDeadTimer())[1];
 136                 bytes[SID_F_OFFSET] = ByteArray.shortToBytes(open.getSessionId())[1];
 137                 ByteArray.copyWhole(tlvs, bytes, TLVS_OFFSET);
 138
 139                 return bytes;
 140         }
 141
 142         public byte[] serializeTlvs(final Tlvs tlvs) {
 143                 int finalLength = 0;
 144                 if (tlvs.getLspDbVersion() != null) {
 145                         final byte[] lspDbBytes = serializeTlv(new LspDbVersionBuilder().setVersion(tlvs.getLspDbVersion().getVersion()).build());
 146                         finalLength = lspDbBytes.length;
 147                 }
 148                 if (tlvs.getOfList() != null) {
 149                         final byte[] ofListBytes = serializeTlv(new OfListBuilder().setCodes(tlvs.getOfList().getCodes()).build());
 150                         finalLength = ofListBytes.length;
 151                 }
 152
 153                 // FIXME: finish
 154
 155                 final byte[] bytes = new byte[finalLength];
 156
 157                 // FIXME copy result bytes
 158                 return bytes;
 159         }
 160
 161         @Override
 162         public int getObjectType() {
 163                 return TYPE;
 164         }
 165
 166         @Override
 167         public int getObjectClass() {
 168                 return CLASS;
 169         }
 170 }