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.yangtools.yang.data.impl.schema.tree;
10 import static com.google.common.base.Preconditions.checkState;
11 import static com.google.common.base.Verify.verify;
12 import static java.util.Objects.requireNonNull;
14 import com.google.common.base.MoreObjects;
15 import com.google.common.collect.Collections2;
16 import com.google.common.collect.ImmutableList;
17 import com.google.common.collect.ImmutableSet;
18 import com.google.common.collect.Maps;
19 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
20 import java.util.Collections;
21 import java.util.Iterator;
22 import java.util.List;
24 import java.util.Optional;
26 import org.eclipse.jdt.annotation.NonNull;
27 import org.eclipse.jdt.annotation.Nullable;
28 import org.opendaylight.yangtools.concepts.Immutable;
29 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
30 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
31 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerNode;
32 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
33 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Descendant;
34 import org.slf4j.Logger;
35 import org.slf4j.LoggerFactory;
38 * A validator for a single {@code unique} constraint. This class is further specialized for single- and
39 * multiple-constraint implementations.
42 * The basic idea is that for each list entry there is a corresponding value vector of one or more values, each
43 * corresponding to one component of the {@code unique} constraint.
45 abstract class UniqueValidator<T> implements Immutable {
46 private static final class One extends UniqueValidator<Object> {
47 One(final List<NodeIdentifier> path) {
48 super(encodePath(path));
52 Object extractValues(final Map<List<NodeIdentifier>, Object> valueCache, final DataContainerNode<?> data) {
53 return extractValue(valueCache, data, decodePath(descendants));
57 Map<Descendant, @Nullable Object> indexValues(final Object values) {
58 return Collections.singletonMap(decodeDescendant(descendants), values);
62 private static final class Many extends UniqueValidator<Set<Object>> {
63 Many(final List<List<NodeIdentifier>> descendantPaths) {
64 super(descendantPaths.stream().map(UniqueValidator::encodePath).collect(ImmutableSet.toImmutableSet()));
68 UniqueValues extractValues(final Map<List<NodeIdentifier>, Object> valueCache,
69 final DataContainerNode<?> data) {
70 return descendants.stream()
71 .map(obj -> extractValue(valueCache, data, decodePath(obj)))
72 .collect(UniqueValues.COLLECTOR);
76 Map<Descendant, @Nullable Object> indexValues(final Object values) {
77 final Map<Descendant, @Nullable Object> index = Maps.newHashMapWithExpectedSize(descendants.size());
78 final Iterator<?> it = ((UniqueValues) values).iterator();
79 for (Object obj : descendants) {
80 verify(index.put(decodeDescendant(obj), it.next()) == null);
86 private static final Logger LOG = LoggerFactory.getLogger(UniqueValidator.class);
88 final @NonNull T descendants;
90 UniqueValidator(final T descendants) {
91 this.descendants = requireNonNull(descendants);
94 static UniqueValidator<?> of(final List<List<NodeIdentifier>> descendants) {
95 return descendants.size() == 1 ? new One(descendants.get(0)) : new Many(descendants);
99 * Extract a value vector from a particular child.
101 * @param valueCache Cache of descendants already looked up
102 * @param data Root data node
103 * @return Value vector
105 abstract @Nullable Object extractValues(Map<List<NodeIdentifier>, Object> valueCache,
106 DataContainerNode<?> data);
109 * Index a value vector by associating each value with its corresponding {@link Descendant}.
111 * @param values Value vector
112 * @return Map of Descandant/value relations
114 abstract Map<Descendant, @Nullable Object> indexValues(Object values);
117 public final String toString() {
118 return MoreObjects.toStringHelper(this).add("paths", descendants).toString();
122 * Encode a path for storage. Single-element paths are squashed to their only element. The inverse operation is
123 * {@link #decodePath(Object)}.
125 * @param path Path to encode
126 * @return Encoded path.
128 @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
129 justification = "https://github.com/spotbugs/spotbugs/issues/811")
130 private static Object encodePath(final List<NodeIdentifier> path) {
131 return path.size() == 1 ? path.get(0) : ImmutableList.copyOf(path);
135 * Decode a path from storage. This is the inverse operation to {@link #encodePath(List)}.
137 * @param obj Encoded path
138 * @return Decoded path
140 private static @NonNull ImmutableList<NodeIdentifier> decodePath(final Object obj) {
141 return obj instanceof NodeIdentifier ? ImmutableList.of((NodeIdentifier) obj)
142 : (ImmutableList<NodeIdentifier>) obj;
145 @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
146 justification = "https://github.com/spotbugs/spotbugs/issues/811")
147 private static @NonNull Descendant decodeDescendant(final Object obj) {
148 return Descendant.of(Collections2.transform(decodePath(obj), NodeIdentifier::getNodeType));
152 * Extract the value for a single descendant.
154 * @param valueCache Cache of descendants already looked up
155 * @param data Root data node
156 * @param path Descendant path
157 * @return Value for the descendant
159 @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
160 justification = "https://github.com/spotbugs/spotbugs/issues/811")
161 private static @Nullable Object extractValue(final Map<List<NodeIdentifier>, Object> valueCache,
162 final DataContainerNode<?> data, final List<NodeIdentifier> path) {
163 return valueCache.computeIfAbsent(path, key -> extractValue(data, key));
167 * Extract the value for a single descendant.
169 * @param data Root data node
170 * @param path Descendant path
171 * @return Value for the descendant
173 private static @Nullable Object extractValue(final DataContainerNode<?> data, final List<NodeIdentifier> path) {
174 DataContainerNode<?> current = data;
175 final Iterator<NodeIdentifier> it = path.iterator();
177 final NodeIdentifier step = it.next();
178 final Optional<DataContainerChild<?, ?>> optNext = current.getChild(step);
179 if (optNext.isEmpty()) {
183 final DataContainerChild<?, ?> next = optNext.orElseThrow();
185 checkState(next instanceof LeafNode, "Unexpected node %s at %s", next, path);
186 final Object value = next.getValue();
187 LOG.trace("Resolved {} to value {}", path, value);
191 checkState(next instanceof DataContainerNode, "Unexpected node %s in %s", next, path);
192 current = (DataContainerNode<?>) next;