2 * Copyright (c) 2014 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.mdsal.binding.dom.codec.impl;
10 import static com.google.common.base.Preconditions.checkArgument;
12 import com.google.common.collect.ImmutableListMultimap;
13 import com.google.common.collect.ImmutableMap;
14 import com.google.common.collect.ImmutableMap.Builder;
15 import com.google.common.collect.ImmutableSet;
16 import com.google.common.collect.Iterables;
17 import com.google.common.collect.Lists;
18 import com.google.common.collect.MultimapBuilder.SetMultimapBuilder;
19 import com.google.common.collect.Multimaps;
20 import com.google.common.collect.SetMultimap;
21 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
22 import java.util.ArrayList;
23 import java.util.Comparator;
24 import java.util.HashMap;
25 import java.util.HashSet;
26 import java.util.List;
28 import java.util.Map.Entry;
29 import java.util.Optional;
31 import java.util.concurrent.ConcurrentHashMap;
32 import java.util.stream.Collectors;
33 import java.util.stream.Stream;
34 import org.eclipse.jdt.annotation.NonNull;
35 import org.opendaylight.mdsal.binding.model.api.JavaTypeName;
36 import org.opendaylight.mdsal.binding.runtime.api.CaseRuntimeType;
37 import org.opendaylight.mdsal.binding.runtime.api.ChoiceRuntimeType;
38 import org.opendaylight.mdsal.binding.spec.reflect.BindingReflections;
39 import org.opendaylight.yangtools.yang.binding.DataObject;
40 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier.PathArgument;
41 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
42 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
43 import org.opendaylight.yangtools.yang.data.api.schema.ChoiceNode;
44 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
45 import org.opendaylight.yangtools.yang.data.util.DataSchemaContextNode;
46 import org.opendaylight.yangtools.yang.data.util.NormalizedNodeSchemaUtils;
47 import org.opendaylight.yangtools.yang.model.api.AugmentationSchemaNode;
48 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
49 import org.opendaylight.yangtools.yang.model.api.DocumentedNode.WithStatus;
50 import org.slf4j.Logger;
51 import org.slf4j.LoggerFactory;
54 * This is a bit tricky. DataObject addressing does not take into account choice/case statements, and hence given:
65 * we will see {@code Baz extends ChildOf<Foo>}, which is how the users would address it in InstanceIdentifier terms.
66 * The implicit assumption being made is that {@code Baz} identifies a particular instantiation and hence provides
67 * unambiguous reference to an effective schema statement.
70 * Unfortunately this does not quite work with groupings, as their generation has changed: we do not have interfaces
71 * that would capture grouping instantiations, hence we do not have a proper addressing point and users need to specify
72 * the interfaces generated in the grouping's definition. These can be very much ambiguous, as a {@code grouping} can be
73 * used in multiple modules independently within an {@code augment} targeting {@code choice}, as each instantiation is
74 * guaranteed to have a unique namespace -- but we do not have the appropriate instantiations of those nodes.
77 * To address this issue we have a two-class lookup mechanism, which relies on the interface generated for the
78 * {@code case} statement to act as the namespace anchor bridging the nodes inside the grouping to the namespace in
79 * which they are instantiated.
82 * Furthermore downstream code relies on historical mechanics, which would guess what the instantiation is, silently
83 * assuming the ambiguity is theoretical and does not occur in practice.
86 * This leads to three classes of addressing, in order descending performance requirements.
88 * <li>Direct DataObject, where we name an exact child</li>
89 * <li>Case DataObject + Grouping DataObject</li>
90 * <li>Grouping DataObject, which is ambiguous</li>
93 * {@link #byCaseChildClass} supports direct DataObject mapping and contains only unambiguous children, while
94 * {@link #byClass} supports indirect mapping and contains {@code case} sub-statements.
96 * {@link #ambiguousByCaseChildClass} contains ambiguous mappings, for which we end up issuing warnings. We track each
97 * ambiguous reference and issue warn once when they are encountered -- tracking warning information in
98 * {@link #ambiguousByCaseChildWarnings}.
100 final class ChoiceNodeCodecContext<D extends DataObject> extends DataContainerCodecContext<D, ChoiceRuntimeType> {
101 private static final Logger LOG = LoggerFactory.getLogger(ChoiceNodeCodecContext.class);
103 private final ImmutableMap<YangInstanceIdentifier.PathArgument, DataContainerCodecPrototype<?>> byYangCaseChild;
104 private final ImmutableListMultimap<Class<?>, DataContainerCodecPrototype<?>> ambiguousByCaseChildClass;
105 private final ImmutableMap<Class<?>, DataContainerCodecPrototype<?>> byCaseChildClass;
106 private final ImmutableMap<Class<?>, DataContainerCodecPrototype<?>> byClass;
107 private final Set<Class<?>> ambiguousByCaseChildWarnings;
109 ChoiceNodeCodecContext(final DataContainerCodecPrototype<ChoiceRuntimeType> prototype) {
111 final Map<YangInstanceIdentifier.PathArgument, DataContainerCodecPrototype<?>> byYangCaseChildBuilder =
113 final Map<Class<?>, DataContainerCodecPrototype<?>> byClassBuilder = new HashMap<>();
114 final SetMultimap<Class<?>, DataContainerCodecPrototype<?>> childToCase =
115 SetMultimapBuilder.hashKeys().hashSetValues().build();
116 final Set<Class<?>> potentialSubstitutions = new HashSet<>();
117 // Walks all cases for supplied choice in current runtime context
118 // FIXME: 9.0.0: factory short-circuits to prototype, just as getBindingClass() does
119 for (final Class<?> caze : loadCaseClasses()) {
120 // We try to load case using exact match thus name
121 // and original schema must equals
122 final DataContainerCodecPrototype<CaseRuntimeType> cazeDef = loadCase(caze);
123 // If we have case definition, this case is instantiated
124 // at current location and thus is valid in context of parent choice
125 if (cazeDef != null) {
126 byClassBuilder.put(cazeDef.getBindingClass(), cazeDef);
127 // Updates collection of case children
128 @SuppressWarnings("unchecked")
129 final Class<? extends DataObject> cazeCls = (Class<? extends DataObject>) caze;
130 for (final Class<? extends DataObject> cazeChild : BindingReflections.getChildrenClasses(cazeCls)) {
131 childToCase.put(cazeChild, cazeDef);
133 // Updates collection of YANG instance identifier to case
134 for (var stmt : cazeDef.getType().statement().effectiveSubstatements()) {
135 if (stmt instanceof DataSchemaNode) {
136 final DataSchemaNode cazeChild = (DataSchemaNode) stmt;
137 if (cazeChild.isAugmenting()) {
138 final AugmentationSchemaNode augment = NormalizedNodeSchemaUtils.findCorrespondingAugment(
140 (DataSchemaNode) cazeDef.getType().statement(), cazeChild);
141 if (augment != null) {
142 byYangCaseChildBuilder.put(DataSchemaContextNode.augmentationIdentifierFrom(augment),
147 byYangCaseChildBuilder.put(NodeIdentifier.create(cazeChild.getQName()), cazeDef);
152 * If case definition is not available, we store it for
153 * later check if it could be used as substitution of existing one.
155 potentialSubstitutions.add(caze);
158 byYangCaseChild = ImmutableMap.copyOf(byYangCaseChildBuilder);
160 // Move unambiguous child->case mappings to byCaseChildClass, removing them from childToCase
161 final ImmutableListMultimap.Builder<Class<?>, DataContainerCodecPrototype<?>> ambiguousByCaseBuilder =
162 ImmutableListMultimap.builder();
163 final Builder<Class<?>, DataContainerCodecPrototype<?>> unambiguousByCaseBuilder = ImmutableMap.builder();
164 for (Entry<Class<?>, Set<DataContainerCodecPrototype<?>>> e : Multimaps.asMap(childToCase).entrySet()) {
165 final Set<DataContainerCodecPrototype<?>> cases = e.getValue();
166 if (cases.size() != 1) {
167 // Sort all possibilities by their FQCN to retain semi-predictable results
168 final List<DataContainerCodecPrototype<?>> list = new ArrayList<>(e.getValue());
169 list.sort(Comparator.comparing(proto -> proto.getBindingClass().getCanonicalName()));
170 ambiguousByCaseBuilder.putAll(e.getKey(), list);
172 unambiguousByCaseBuilder.put(e.getKey(), cases.iterator().next());
175 byCaseChildClass = unambiguousByCaseBuilder.build();
177 // Setup ambiguous tracking, if needed
178 ambiguousByCaseChildClass = ambiguousByCaseBuilder.build();
179 ambiguousByCaseChildWarnings = ambiguousByCaseChildClass.isEmpty() ? ImmutableSet.of()
180 : ConcurrentHashMap.newKeySet();
182 final Map<Class<?>, DataContainerCodecPrototype<?>> bySubstitutionBuilder = new HashMap<>();
184 * Walks all cases which are not directly instantiated and
185 * tries to match them to instantiated cases - represent same data as instantiated case,
186 * only case name or schema path is different. This is required due property of
187 * binding specification, that if choice is in grouping schema path location is lost,
188 * and users may use incorrect case class using copy builders.
190 for (final Class<?> substitution : potentialSubstitutions) {
191 search: for (final Entry<Class<?>, DataContainerCodecPrototype<?>> real : byClassBuilder.entrySet()) {
192 if (BindingReflections.isSubstitutionFor(substitution, real.getKey())) {
193 bySubstitutionBuilder.put(substitution, real.getValue());
198 byClassBuilder.putAll(bySubstitutionBuilder);
199 byClass = ImmutableMap.copyOf(byClassBuilder);
202 private List<Class<?>> loadCaseClasses() {
203 final var context = factory().getRuntimeContext();
204 final var type = getType();
206 return Stream.concat(type.validCaseChildren().stream(), type.additionalCaseChildren().stream())
208 final var caseName = caseChild.getIdentifier();
210 return context.loadClass(caseName);
211 } catch (ClassNotFoundException e) {
212 throw new IllegalStateException("Failed to load class for " + caseName, e);
215 .collect(Collectors.toUnmodifiableList());
219 public WithStatus getSchema() {
220 // FIXME: Bad cast, we should be returning an EffectiveStatement perhaps?
221 return (WithStatus) getType().statement();
224 @SuppressWarnings("unchecked")
226 public <C extends DataObject> DataContainerCodecContext<C, ?> streamChild(final Class<C> childClass) {
227 final DataContainerCodecPrototype<?> child = byClass.get(childClass);
228 return (DataContainerCodecContext<C, ?>) childNonNull(child, childClass,
229 "Supplied class %s is not valid case in %s", childClass, bindingArg()).get();
232 @SuppressWarnings("unchecked")
234 public <C extends DataObject> Optional<DataContainerCodecContext<C, ?>> possibleStreamChild(
235 final Class<C> childClass) {
236 final DataContainerCodecPrototype<?> child = byClass.get(childClass);
238 return Optional.of((DataContainerCodecContext<C, ?>) child.get());
240 return Optional.empty();
243 Iterable<Class<?>> getCaseChildrenClasses() {
244 return Iterables.concat(byCaseChildClass.keySet(), ambiguousByCaseChildClass.keySet());
247 protected DataContainerCodecPrototype<CaseRuntimeType> loadCase(final Class<?> childClass) {
248 final var child = getType().bindingCaseChild(JavaTypeName.create(childClass));
250 LOG.debug("Supplied class {} is not valid case in schema {}", childClass, getSchema());
254 return DataContainerCodecPrototype.from(childClass, child, factory());
258 public NodeCodecContext yangPathArgumentChild(final YangInstanceIdentifier.PathArgument arg) {
259 final DataContainerCodecPrototype<?> cazeProto;
260 if (arg instanceof YangInstanceIdentifier.NodeIdentifierWithPredicates) {
261 cazeProto = byYangCaseChild.get(new NodeIdentifier(arg.getNodeType()));
263 cazeProto = byYangCaseChild.get(arg);
266 return childNonNull(cazeProto, arg, "Argument %s is not valid child of %s", arg, getSchema()).get()
267 .yangPathArgumentChild(arg);
271 @SuppressWarnings("unchecked")
272 @SuppressFBWarnings(value = "NP_NONNULL_RETURN_VIOLATION", justification = "See FIXME below")
273 public D deserialize(final NormalizedNode data) {
274 checkArgument(data instanceof ChoiceNode);
275 final ChoiceNode casted = (ChoiceNode) data;
276 final NormalizedNode first = Iterables.getFirst(casted.body(), null);
279 // FIXME: this needs to be sorted out
282 final DataContainerCodecPrototype<?> caze = byYangCaseChild.get(first.getIdentifier());
283 return (D) caze.get().deserialize(data);
287 protected Object deserializeObject(final NormalizedNode normalizedNode) {
288 return deserialize(normalizedNode);
292 public PathArgument deserializePathArgument(final YangInstanceIdentifier.PathArgument arg) {
293 checkArgument(getDomPathArgument().equals(arg));
298 public YangInstanceIdentifier.PathArgument serializePathArgument(final PathArgument arg) {
299 // FIXME: check for null, since binding container is null.
300 return getDomPathArgument();
303 DataContainerCodecContext<?, ?> getCaseByChildClass(final @NonNull Class<? extends DataObject> type) {
304 DataContainerCodecPrototype<?> result = byCaseChildClass.get(type);
305 if (result == null) {
306 // We have not found an unambiguous result, try ambiguous ones
307 final List<DataContainerCodecPrototype<?>> inexact = ambiguousByCaseChildClass.get(type);
308 if (!inexact.isEmpty()) {
309 result = inexact.get(0);
310 // Issue a warning, but only once so as not to flood the logs
311 if (ambiguousByCaseChildWarnings.add(type)) {
312 LOG.warn("Ambiguous reference {} to child of {} resolved to {}, the first case in {} This mapping "
313 + "is not guaranteed to be stable and is subject to variations based on runtime "
314 + "circumstances. Please see the stack trace for hints about the source of ambiguity.",
315 type, bindingArg(), result.getBindingClass(),
316 Lists.transform(inexact, DataContainerCodecPrototype::getBindingClass), new Throwable());
321 return childNonNull(result, type, "Class %s is not child of any cases for %s", type, bindingArg()).get();