2 * Copyright (c) 2016 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.bgp.parser.spi;
10 import com.google.common.base.Preconditions;
11 import io.netty.buffer.ByteBuf;
12 import java.util.Optional;
13 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev180329.PathId;
14 import org.opendaylight.yangtools.util.ImmutableOffsetMapTemplate;
15 import org.opendaylight.yangtools.yang.common.QName;
16 import org.opendaylight.yangtools.yang.common.Uint32;
17 import org.opendaylight.yangtools.yang.common.netty.ByteBufUtils;
18 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
19 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
20 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
21 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
22 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerNode;
23 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
24 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodes;
26 public final class PathIdUtil {
27 public static final Uint32 NON_PATH_ID_VALUE = Uint32.ZERO;
28 public static final PathId NON_PATH_ID = new PathId(NON_PATH_ID_VALUE);
30 private PathIdUtil() {
35 * Writes path-id value into the buffer when the path-id is not null or does not equal to zero.
37 * @param pathId The NLRI Path Identifier.
38 * @param buffer The ByteBuf where path-id value can be written.
40 public static void writePathId(final PathId pathId, final ByteBuf buffer) {
42 final int value = pathId.getValue().intValue();
44 buffer.writeInt(value);
50 * Reads Path Identifier (4 bytes) from buffer.
52 * @param buffer Input buffer.
53 * @return Decoded PathId.
55 public static PathId readPathId(final ByteBuf buffer) {
56 Preconditions.checkArgument(buffer != null && buffer.isReadable(Integer.BYTES));
57 return new PathId(ByteBufUtils.readUint32(buffer));
61 * Extract PathId from route change received.
63 * @param data Data containing the path Id
64 * @param pathNii Path Id NodeIdentifier specific per each Rib support
65 * @return The path identifier from data change
67 public static Uint32 extractPathId(final NormalizedNode<?, ?> data, final NodeIdentifier pathNii) {
68 return (Uint32) NormalizedNodes.findNode(data, pathNii).map(NormalizedNode::getValue).orElse(null);
74 * @param routesCont route container
75 * @param pathIdNii path Id node Identifier
76 * @return PathId or null in case is not the container
78 public static PathId buildPathId(final DataContainerNode<? extends PathArgument> routesCont,
79 final NodeIdentifier pathIdNii) {
80 final Uint32 pathIdVal = PathIdUtil.extractPathId(routesCont, pathIdNii);
81 return pathIdVal == null ? null : new PathId(pathIdVal);
85 * Build Route Key for supporting mp.
86 * Key is composed by 2 elements (route-key + path Id).
88 * @param routeQName route QName
89 * @param routeKeyTemplate route key template
90 * @param routeKeyValue route key value
91 * @param maybePathIdLeaf path id container, it might me supported or not, in that case default 0 value will
93 * @return Route Key Nid
95 public static NodeIdentifierWithPredicates createNidKey(final QName routeQName,
96 final ImmutableOffsetMapTemplate<QName> routeKeyTemplate, final Object routeKeyValue,
97 final Optional<DataContainerChild<? extends PathArgument, ?>> maybePathIdLeaf) {
98 // FIXME: a cache here would mean we instantiate the same identifier for each route making comparison quicker.
99 final Object pathId = maybePathIdLeaf.isPresent() ? maybePathIdLeaf.get().getValue() : NON_PATH_ID_VALUE;
100 return NodeIdentifierWithPredicates.of(routeQName,
101 routeKeyTemplate.instantiateWithValues(pathId, routeKeyValue));