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 java.util.AbstractMap.SimpleImmutableEntry;
11 import java.util.Optional;
12 import org.eclipse.jdt.annotation.NonNullByDefault;
13 import org.opendaylight.mdsal.dom.api.query.DOMQuery;
14 import org.opendaylight.mdsal.dom.api.query.DOMQueryResult;
15 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
16 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
17 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
18 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodes;
21 public final class DOMQueryEvaluator {
22 private DOMQueryEvaluator() {
27 * Evaluate {@link DOMQuery} on its data element. The element is expected to correspond to
28 * {@link DOMQuery#getRoot()}.
30 * @param query Query to execute
31 * @param queryRoot Query root object
32 * @return Result of evaluation
33 * @throws NullPointerException if any argument is null
35 public static DOMQueryResult evaluateOn(final DOMQuery query, final NormalizedNode<?, ?> queryRoot) {
36 final YangInstanceIdentifier path = query.getSelect();
37 return path.isEmpty() ? evalSingle(query, queryRoot) : new LazyDOMQueryResult(query, queryRoot);
41 * Evaluate {@link DOMQuery} on a conceptual root. The element is expected to correspond to the conceptual data tree
42 * root. This method will first find the {@link DOMQuery#getRoot()} and then defer to
43 * {@link #evaluateOn(DOMQuery, NormalizedNode)}.
45 * @param query Query to execute
46 * @param root Conceptual root object
47 * @return Result of evaluation
48 * @throws NullPointerException if any argument is null
50 public static DOMQueryResult evaluateOnRoot(final DOMQuery query, final NormalizedNode<?, ?> root) {
51 NormalizedNode<?, ?> evalRoot = root;
52 for (PathArgument arg : query.getRoot().getPathArguments()) {
53 final Optional<NormalizedNode<?, ?>> next = NormalizedNodes.findNode(root, arg);
55 return DOMQueryResult.of();
57 evalRoot = next.orElseThrow();
59 return evaluateOn(query, evalRoot);
62 private static DOMQueryResult evalSingle(final DOMQuery query, final NormalizedNode<?, ?> data) {
63 return LazyDOMQueryResultIterator.matches(data, query.getPredicates()) ? DOMQueryResult.of()
64 : DOMQueryResult.of(new SimpleImmutableEntry<>(query.getRoot(), data));