org.opendaylight.protocol.bgp.flowspec.FSPacketLengthHandler Maven / Gradle / Ivy
/*
* Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.protocol.bgp.flowspec;
import static java.util.Objects.requireNonNull;
import com.google.common.base.Preconditions;
import io.netty.buffer.ByteBuf;
import java.util.ArrayList;
import java.util.List;
import org.opendaylight.protocol.bgp.flowspec.handlers.AbstractOperandParser;
import org.opendaylight.protocol.bgp.flowspec.handlers.FlowspecTypeParser;
import org.opendaylight.protocol.bgp.flowspec.handlers.FlowspecTypeSerializer;
import org.opendaylight.protocol.bgp.flowspec.handlers.NumericOneByteOperandParser;
import org.opendaylight.protocol.bgp.flowspec.handlers.NumericTwoByteOperandParser;
import org.opendaylight.protocol.util.ByteArray;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev200120.NumericOperand;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev200120.flowspec.destination.flowspec.FlowspecType;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev200120.flowspec.destination.flowspec.flowspec.type.PacketLengthCase;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev200120.flowspec.destination.flowspec.flowspec.type.PacketLengthCaseBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev200120.flowspec.destination.flowspec.flowspec.type.packet.length._case.PacketLengths;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev200120.flowspec.destination.flowspec.flowspec.type.packet.length._case.PacketLengthsBuilder;
import org.opendaylight.yangtools.yang.common.Uint16;
public final class FSPacketLengthHandler implements FlowspecTypeParser, FlowspecTypeSerializer {
public static final int PACKET_LENGTH_VALUE = 10;
@Override
public void serializeType(final FlowspecType fsType, final ByteBuf output) {
Preconditions.checkArgument(fsType instanceof PacketLengthCase, "PacketLengthCase class is mandatory!");
output.writeByte(PACKET_LENGTH_VALUE);
NumericTwoByteOperandParser.INSTANCE.serialize(((PacketLengthCase) fsType).getPacketLengths(), output);
}
@Override
public FlowspecType parseType(final ByteBuf buffer) {
requireNonNull(buffer, "input buffer is null, missing data to parse.");
return new PacketLengthCaseBuilder().setPacketLengths(parsePacketLength(buffer)).build();
}
private static List parsePacketLength(final ByteBuf nlri) {
final List packetLengths = new ArrayList<>();
boolean end = false;
// we can do this as all fields will be rewritten in the cycle
final PacketLengthsBuilder builder = new PacketLengthsBuilder();
while (!end) {
final byte b = nlri.readByte();
final NumericOperand op = NumericOneByteOperandParser.INSTANCE.parse(b);
builder.setOp(op);
final short length = AbstractOperandParser.parseLength(b);
builder.setValue(Uint16.valueOf(ByteArray.bytesToInt(ByteArray.readBytes(nlri, length))));
end = op.getEndOfList();
packetLengths.add(builder.build());
}
return packetLengths;
}
}