2 * Copyright (c) 2020 PANTHEON.tech, s.r.o. 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.mdsal.dom.spi.query;
10 import static com.google.common.base.Preconditions.checkArgument;
12 import com.google.common.collect.ImmutableList;
13 import java.util.AbstractMap.SimpleImmutableEntry;
14 import java.util.ArrayDeque;
15 import java.util.ArrayList;
16 import java.util.List;
17 import java.util.Map.Entry;
18 import java.util.Optional;
19 import org.eclipse.jdt.annotation.NonNullByDefault;
20 import org.opendaylight.mdsal.dom.api.query.DOMQuery;
21 import org.opendaylight.mdsal.dom.api.query.DOMQueryPredicate;
22 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
23 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
24 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
25 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
26 import org.opendaylight.yangtools.yang.data.api.schema.MapNode;
27 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
28 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodes;
31 public final class DOMQueryEvaluator {
32 private DOMQueryEvaluator() {
36 public static List<? extends Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> evaluate(final DOMQuery query,
37 final NormalizedNode<?, ?> root) {
38 final YangInstanceIdentifier path = query.getSelect();
39 return path.isEmpty() ? evalSingle(root, query)
40 : evalPath(new ArrayDeque<>(path.getPathArguments()), root, query);
43 private static List<? extends Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> evalPath(
44 final ArrayDeque<PathArgument> remaining, final NormalizedNode<?,?> data, final DOMQuery query) {
45 NormalizedNode<?, ?> evalRoot = data;
46 for (PathArgument arg : query.getRoot().getPathArguments()) {
47 final Optional<NormalizedNode<?, ?>> next = NormalizedNodes.findNode(data, arg);
49 return ImmutableList.of();
51 evalRoot = next.orElseThrow();
54 final List<Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> result = new ArrayList<>();
55 evalPath(result, query.getRoot(), remaining, evalRoot, query);
59 private static void evalPath(final List<Entry<YangInstanceIdentifier, NormalizedNode<?,?>>> result,
60 final YangInstanceIdentifier path, final ArrayDeque<PathArgument> remaining,
61 final NormalizedNode<?, ?> data, final DOMQuery query) {
62 final PathArgument next = remaining.poll();
64 if (matches(data, query)) {
65 result.add(new SimpleImmutableEntry<>(path, data));
70 if (data instanceof MapNode && next instanceof NodeIdentifier) {
71 checkArgument(data.getIdentifier().equals(next), "Unexpected step %s", next);
72 for (MapEntryNode child : ((MapNode) data).getValue()) {
73 evalPath(result, path.node(child.getIdentifier()), remaining, child, query);
76 NormalizedNodes.getDirectChild(data, next).ifPresent(
77 child -> evalPath(result, path.node(next), remaining, child, query));
82 private static List<? extends Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> evalSingle(
83 final NormalizedNode<?, ?> data, final DOMQuery query) {
84 return matches(data, query) ? ImmutableList.of()
85 : ImmutableList.of(new SimpleImmutableEntry<>(query.getRoot(), data));
88 private static boolean matches(final NormalizedNode<?, ?> data, final DOMQuery query) {
89 for (DOMQueryPredicate pred : query.getPredicates()) {
90 if (!pred.test(NormalizedNodes.findNode(data, pred.getPath()).orElse(null))) {