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 com.google.common.collect.ImmutableList;
11 import java.util.AbstractMap.SimpleImmutableEntry;
12 import java.util.ArrayDeque;
13 import java.util.ArrayList;
14 import java.util.List;
15 import java.util.Map.Entry;
16 import org.opendaylight.mdsal.dom.api.query.DOMQuery;
17 import org.opendaylight.mdsal.dom.api.query.DOMQueryPredicate;
18 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
19 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
20 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
21 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodes;
23 public final class DOMQueryEvaluator {
24 private DOMQueryEvaluator() {
28 public static List<? extends Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> evaluate(final DOMQuery query,
29 final NormalizedNode<?, ?> root) {
30 final YangInstanceIdentifier path = query.getSelect();
31 return path.isEmpty() ? evalSingle(root, query)
32 : evalPath(new ArrayDeque<>(path.getPathArguments()), root, query);
35 private static List<? extends Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> evalPath(
36 final ArrayDeque<PathArgument> remaining, final NormalizedNode<?,?> data, final DOMQuery query) {
37 final List<Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> result = new ArrayList<>();
38 evalPath(result, query.getRoot(), remaining, data, query);
42 private static void evalPath(final List<Entry<YangInstanceIdentifier, NormalizedNode<?,?>>> result,
43 final YangInstanceIdentifier path, final ArrayDeque<PathArgument> remaining,
44 final NormalizedNode<?, ?> data, final DOMQuery query) {
45 final PathArgument next = remaining.poll();
47 if (matches(data, query)) {
48 result.add(new SimpleImmutableEntry<>(query.getRoot(), data));
53 // TODO: this is probably insufficient
54 NormalizedNodes.findNode(data, next)
55 .ifPresent(child -> evalPath(result, path.node(next), remaining, child, query));
59 private static List<? extends Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> evalSingle(
60 final NormalizedNode<?, ?> data, final DOMQuery query) {
61 return matches(data, query) ? ImmutableList.of()
62 : ImmutableList.of(new SimpleImmutableEntry<>(query.getRoot(), data));
65 private static boolean matches(final NormalizedNode<?, ?> data, final DOMQuery query) {
66 for (DOMQueryPredicate pred : query.getPredicates()) {
67 if (!pred.test(data)) {