Java tutorial
/* * 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 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.FlowspecTypeParser; import org.opendaylight.protocol.bgp.flowspec.handlers.FlowspecTypeSerializer; import org.opendaylight.protocol.bgp.flowspec.handlers.NumericOneByteOperandParser; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev150807.NumericOperand; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev150807.flowspec.destination.flowspec.FlowspecType; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev150807.flowspec.destination.group.ipv6.flowspec.flowspec.type.NextHeaderCase; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev150807.flowspec.destination.group.ipv6.flowspec.flowspec.type.NextHeaderCaseBuilder; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev150807.flowspec.destination.group.ipv6.flowspec.flowspec.type.next.header._case.NextHeaders; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev150807.flowspec.destination.group.ipv6.flowspec.flowspec.type.next.header._case.NextHeadersBuilder; public final class FSIpv6NextHeaderHandler implements FlowspecTypeParser, FlowspecTypeSerializer { public static final int NEXT_HEADER_VALUE = 3; @Override public void serializeType(FlowspecType value, ByteBuf output) { Preconditions.checkArgument(value instanceof NextHeaderCase, "NextHeaderCase class is mandatory!"); output.writeByte(NEXT_HEADER_VALUE); NumericOneByteOperandParser.INSTANCE.serialize(((NextHeaderCase) value).getNextHeaders(), output); } @Override public FlowspecType parseType(ByteBuf buffer) { if (buffer == null) { return null; } return new NextHeaderCaseBuilder().setNextHeaders(parseNextHeader(buffer)).build(); } private static List<NextHeaders> parseNextHeader(final ByteBuf nlri) { final List<NextHeaders> headers = new ArrayList<>(); boolean end = false; // we can do this as all fields will be rewritten in the cycle final NextHeadersBuilder builder = new NextHeadersBuilder(); while (!end) { final byte b = nlri.readByte(); final NumericOperand op = NumericOneByteOperandParser.INSTANCE.parse(b); builder.setOp(op); builder.setValue(nlri.readUnsignedByte()); end = op.isEndOfList(); headers.add(builder.build()); } return headers; } }