2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.protocol.pcep.spi;
10 import io.netty.buffer.ByteBuf;
11 import io.netty.buffer.ByteBufUtil;
13 import java.util.Arrays;
15 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.types.rev131005.Tlv;
16 import org.slf4j.Logger;
17 import org.slf4j.LoggerFactory;
19 import com.google.common.base.Preconditions;
21 public abstract class AbstractObjectWithTlvsParser<T> implements ObjectParser, ObjectSerializer {
23 private static final Logger LOG = LoggerFactory.getLogger(AbstractObjectWithTlvsParser.class);
25 private static final int TLV_TYPE_F_LENGTH = 2;
26 private static final int TLV_LENGTH_F_LENGTH = 2;
27 private static final int TLV_HEADER_LENGTH = TLV_LENGTH_F_LENGTH + TLV_TYPE_F_LENGTH;
29 protected static final int PADDED_TO = 4;
31 private final TlvRegistry tlvReg;
33 protected AbstractObjectWithTlvsParser(final TlvRegistry tlvReg) {
34 this.tlvReg = Preconditions.checkNotNull(tlvReg);
37 protected final void parseTlvs(final T builder, final ByteBuf bytes) throws PCEPDeserializerException {
38 Preconditions.checkArgument(bytes != null, "Array of bytes is mandatory. Can't be null.");
39 if (!bytes.isReadable()) {
42 while (bytes.isReadable()) {
43 int type = bytes.readUnsignedShort();
44 int length = bytes.readUnsignedShort();
45 if (length > bytes.readableBytes()) {
46 throw new PCEPDeserializerException("Wrong length specified. Passed: " + length + "; Expected: <= "
47 + bytes.readableBytes() + ".");
49 final ByteBuf tlvBytes = bytes.slice(bytes.readerIndex(), length);
50 LOG.trace("Attempt to parse tlv from bytes: {}", ByteBufUtil.hexDump(tlvBytes));
51 final Tlv tlv = this.tlvReg.parseTlv(type, tlvBytes);
52 LOG.trace("Tlv was parsed. {}", tlv);
54 bytes.readerIndex(bytes.readerIndex() + length + getPadding(TLV_HEADER_LENGTH + length, PADDED_TO));
58 protected final byte[] serializeTlv(final Tlv tlv) {
59 Preconditions.checkNotNull(tlv, "PCEP TLV is mandatory.");
60 LOG.trace("Serializing PCEP TLV {}", tlv);
61 final byte[] ret = this.tlvReg.serializeTlv(tlv);
63 LOG.warn("TLV serializer for type {} could not be found.", tlv);
65 LOG.trace("Serialized PCEP TLV {}.", Arrays.toString(ret));
69 protected void addTlv(final T builder, final Tlv tlv) {
70 // FIXME: No TLVs by default, fallback to augments
73 public static int getPadding(final int length, final int padding) {
74 return (padding - (length % padding)) % padding;