Java tutorial
/* * Copyright (c) 2016 Brocade Communications 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.ipv6; import com.google.common.base.Optional; import java.util.ArrayList; import java.util.List; import java.util.Set; import org.opendaylight.protocol.bgp.flowspec.AbstractFlowspecNlriParser; import org.opendaylight.protocol.bgp.flowspec.handlers.NumericOneByteOperandParser; import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Prefix; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev150807.flowspec.destination.FlowspecBuilder; 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.DestinationIpv6PrefixCase; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev150807.flowspec.destination.group.ipv6.flowspec.flowspec.type.DestinationIpv6PrefixCaseBuilder; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev150807.flowspec.destination.group.ipv6.flowspec.flowspec.type.FlowLabelCase; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev150807.flowspec.destination.group.ipv6.flowspec.flowspec.type.FlowLabelCaseBuilder; 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.SourceIpv6PrefixCase; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev150807.flowspec.destination.group.ipv6.flowspec.flowspec.type.SourceIpv6PrefixCaseBuilder; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev150807.flowspec.destination.group.ipv6.flowspec.flowspec.type.flow.label._case.FlowLabel; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.flowspec.rev150807.flowspec.destination.group.ipv6.flowspec.flowspec.type.flow.label._case.FlowLabelBuilder; 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; import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier; import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument; import org.opendaylight.yangtools.yang.data.api.schema.ChoiceNode; import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild; import org.opendaylight.yangtools.yang.data.api.schema.UnkeyedListEntryNode; import org.opendaylight.yangtools.yang.data.api.schema.UnkeyedListNode; public final class FlowspecIpv6NlriParserHelper { private static final NodeIdentifier NEXT_HEADER_NID = new NodeIdentifier(NextHeaders.QNAME); private static final NodeIdentifier FLOW_LABEL_NID = new NodeIdentifier(FlowLabel.QNAME); private FlowspecIpv6NlriParserHelper() { } public static final void extractFlowspec(final ChoiceNode fsType, final FlowspecBuilder fsBuilder) { if (fsType.getChild(AbstractFlowspecNlriParser.DEST_PREFIX_NID).isPresent()) { fsBuilder.setFlowspecType(new DestinationIpv6PrefixCaseBuilder() .setDestinationPrefix(new Ipv6Prefix( (String) fsType.getChild(AbstractFlowspecNlriParser.DEST_PREFIX_NID).get().getValue())) .build()); } else if (fsType.getChild(AbstractFlowspecNlriParser.SOURCE_PREFIX_NID).isPresent()) { fsBuilder.setFlowspecType(new SourceIpv6PrefixCaseBuilder().setSourcePrefix(new Ipv6Prefix( (String) fsType.getChild(AbstractFlowspecNlriParser.SOURCE_PREFIX_NID).get().getValue())) .build()); } else if (fsType.getChild(NEXT_HEADER_NID).isPresent()) { fsBuilder.setFlowspecType(new NextHeaderCaseBuilder() .setNextHeaders(createNextHeaders((UnkeyedListNode) fsType.getChild(NEXT_HEADER_NID).get())) .build()); } else if (fsType.getChild(FLOW_LABEL_NID).isPresent()) { fsBuilder.setFlowspecType(new FlowLabelCaseBuilder() .setFlowLabel(createFlowLabels((UnkeyedListNode) fsType.getChild(FLOW_LABEL_NID).get())) .build()); } } public static final void buildFlowspecString(final FlowspecType value, final StringBuilder buffer) { if (value instanceof DestinationIpv6PrefixCase) { buffer.append("to "); buffer.append(((DestinationIpv6PrefixCase) value).getDestinationPrefix().getValue()); } else if (value instanceof SourceIpv6PrefixCase) { buffer.append("from "); buffer.append(((SourceIpv6PrefixCase) value).getSourcePrefix().getValue()); } else if (value instanceof NextHeaderCase) { buffer.append("where next header "); buffer.append(NumericOneByteOperandParser.INSTANCE.toString(((NextHeaderCase) value).getNextHeaders())); } else if (value instanceof FlowLabelCase) { buffer.append("where flow label "); buffer.append(stringFlowLabel(((FlowLabelCase) value).getFlowLabel())); } } private static final List<NextHeaders> createNextHeaders(final UnkeyedListNode nextHeadersData) { final List<NextHeaders> nextHeaders = new ArrayList<>(); for (final UnkeyedListEntryNode node : nextHeadersData.getValue()) { final NextHeadersBuilder nextHeadersBuilder = new NextHeadersBuilder(); final Optional<DataContainerChild<? extends PathArgument, ?>> opValue = node .getChild(AbstractFlowspecNlriParser.OP_NID); if (opValue.isPresent()) { nextHeadersBuilder .setOp(NumericOneByteOperandParser.INSTANCE.create((Set<String>) opValue.get().getValue())); } final Optional<DataContainerChild<? extends PathArgument, ?>> valueNode = node .getChild(AbstractFlowspecNlriParser.VALUE_NID); if (valueNode.isPresent()) { nextHeadersBuilder.setValue((Short) valueNode.get().getValue()); } nextHeaders.add(nextHeadersBuilder.build()); } return nextHeaders; } private static final List<FlowLabel> createFlowLabels(final UnkeyedListNode flowLabelsData) { final List<FlowLabel> flowLabels = new ArrayList<>(); for (final UnkeyedListEntryNode node : flowLabelsData.getValue()) { final FlowLabelBuilder flowLabelsBuilder = new FlowLabelBuilder(); final Optional<DataContainerChild<? extends PathArgument, ?>> opValue = node .getChild(AbstractFlowspecNlriParser.OP_NID); if (opValue.isPresent()) { flowLabelsBuilder .setOp(NumericOneByteOperandParser.INSTANCE.create((Set<String>) opValue.get().getValue())); } final Optional<DataContainerChild<? extends PathArgument, ?>> valueNode = node .getChild(AbstractFlowspecNlriParser.VALUE_NID); if (valueNode.isPresent()) { flowLabelsBuilder.setValue((Long) valueNode.get().getValue()); } flowLabels.add(flowLabelsBuilder.build()); } return flowLabels; } private static final String stringFlowLabel(final List<FlowLabel> list) { final StringBuilder buffer = new StringBuilder(); boolean isFirst = true; for (final FlowLabel item : list) { buffer.append(NumericOneByteOperandParser.INSTANCE.toString(item.getOp(), isFirst)); buffer.append(item.getValue()); buffer.append(' '); if (isFirst) { isFirst = false; } } return buffer.toString(); } }