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.lang.reflect.Method;
23 import java.util.ArrayList;
24 import java.util.Comparator;
25 import java.util.HashMap;
26 import java.util.HashSet;
27 import java.util.LinkedList;
28 import java.util.List;
30 import java.util.Map.Entry;
31 import java.util.Optional;
33 import java.util.concurrent.ConcurrentHashMap;
34 import org.eclipse.jdt.annotation.NonNull;
35 import org.opendaylight.mdsal.binding.model.api.JavaTypeName;
36 import org.opendaylight.mdsal.binding.runtime.api.BindingRuntimeContext;
37 import org.opendaylight.mdsal.binding.runtime.api.CaseRuntimeType;
38 import org.opendaylight.mdsal.binding.runtime.api.ChoiceRuntimeType;
39 import org.opendaylight.yangtools.yang.binding.DataContainer;
40 import org.opendaylight.yangtools.yang.binding.DataObject;
41 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier.PathArgument;
42 import org.opendaylight.yangtools.yang.binding.contract.Naming;
43 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
44 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
45 import org.opendaylight.yangtools.yang.data.api.schema.ChoiceNode;
46 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
47 import org.opendaylight.yangtools.yang.data.util.DataSchemaContextNode;
48 import org.opendaylight.yangtools.yang.data.util.NormalizedNodeSchemaUtils;
49 import org.opendaylight.yangtools.yang.model.api.AugmentationSchemaNode;
50 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
51 import org.opendaylight.yangtools.yang.model.api.DocumentedNode.WithStatus;
52 import org.slf4j.Logger;
53 import org.slf4j.LoggerFactory;
56 * This is a bit tricky. DataObject addressing does not take into account choice/case statements, and hence given:
67 * we will see {@code Baz extends ChildOf<Foo>}, which is how the users would address it in InstanceIdentifier terms.
68 * The implicit assumption being made is that {@code Baz} identifies a particular instantiation and hence provides
69 * unambiguous reference to an effective schema statement.
72 * Unfortunately this does not quite work with groupings, as their generation has changed: we do not have interfaces
73 * that would capture grouping instantiations, hence we do not have a proper addressing point and users need to specify
74 * the interfaces generated in the grouping's definition. These can be very much ambiguous, as a {@code grouping} can be
75 * used in multiple modules independently within an {@code augment} targeting {@code choice}, as each instantiation is
76 * guaranteed to have a unique namespace -- but we do not have the appropriate instantiations of those nodes.
79 * To address this issue we have a two-class lookup mechanism, which relies on the interface generated for the
80 * {@code case} statement to act as the namespace anchor bridging the nodes inside the grouping to the namespace in
81 * which they are instantiated.
84 * Furthermore downstream code relies on historical mechanics, which would guess what the instantiation is, silently
85 * assuming the ambiguity is theoretical and does not occur in practice.
88 * This leads to three classes of addressing, in order descending performance requirements.
90 * <li>Direct DataObject, where we name an exact child</li>
91 * <li>Case DataObject + Grouping DataObject</li>
92 * <li>Grouping DataObject, which is ambiguous</li>
95 * {@link #byCaseChildClass} supports direct DataObject mapping and contains only unambiguous children, while
96 * {@link #byClass} supports indirect mapping and contains {@code case} sub-statements.
98 * {@link #ambiguousByCaseChildClass} contains ambiguous mappings, for which we end up issuing warnings. We track each
99 * ambiguous reference and issue warn once when they are encountered -- tracking warning information in
100 * {@link #ambiguousByCaseChildWarnings}.
102 final class ChoiceNodeCodecContext<D extends DataObject> extends DataContainerCodecContext<D, ChoiceRuntimeType> {
103 private static final Logger LOG = LoggerFactory.getLogger(ChoiceNodeCodecContext.class);
105 private final ImmutableMap<YangInstanceIdentifier.PathArgument, DataContainerCodecPrototype<?>> byYangCaseChild;
106 private final ImmutableListMultimap<Class<?>, DataContainerCodecPrototype<?>> ambiguousByCaseChildClass;
107 private final ImmutableMap<Class<?>, DataContainerCodecPrototype<?>> byCaseChildClass;
108 private final ImmutableMap<Class<?>, DataContainerCodecPrototype<?>> byClass;
109 private final Set<Class<?>> ambiguousByCaseChildWarnings;
111 ChoiceNodeCodecContext(final DataContainerCodecPrototype<ChoiceRuntimeType> prototype) {
113 final Map<YangInstanceIdentifier.PathArgument, DataContainerCodecPrototype<?>> byYangCaseChildBuilder =
115 final Map<Class<?>, DataContainerCodecPrototype<?>> byClassBuilder = new HashMap<>();
116 final SetMultimap<Class<?>, DataContainerCodecPrototype<?>> childToCase =
117 SetMultimapBuilder.hashKeys().hashSetValues().build();
119 // Load case statements valid in this choice and keep track of their names
120 final var choiceType = prototype.getType();
121 final var factory = prototype.getFactory();
122 final var localCases = new HashSet<JavaTypeName>();
123 for (var caseType : choiceType.validCaseChildren()) {
124 final var cazeDef = loadCase(factory, caseType);
125 localCases.add(caseType.getIdentifier());
126 byClassBuilder.put(cazeDef.getBindingClass(), cazeDef);
128 // Updates collection of case children
129 @SuppressWarnings("unchecked")
130 final Class<? extends DataObject> cazeCls = (Class<? extends DataObject>) cazeDef.getBindingClass();
131 for (final Class<? extends DataObject> cazeChild : getChildrenClasses(cazeCls)) {
132 childToCase.put(cazeChild, cazeDef);
134 // Updates collection of YANG instance identifier to case
135 for (var stmt : cazeDef.getType().statement().effectiveSubstatements()) {
136 if (stmt instanceof DataSchemaNode cazeChild) {
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);
151 byYangCaseChild = ImmutableMap.copyOf(byYangCaseChildBuilder);
153 // Move unambiguous child->case mappings to byCaseChildClass, removing them from childToCase
154 final ImmutableListMultimap.Builder<Class<?>, DataContainerCodecPrototype<?>> ambiguousByCaseBuilder =
155 ImmutableListMultimap.builder();
156 final Builder<Class<?>, DataContainerCodecPrototype<?>> unambiguousByCaseBuilder = ImmutableMap.builder();
157 for (Entry<Class<?>, Set<DataContainerCodecPrototype<?>>> e : Multimaps.asMap(childToCase).entrySet()) {
158 final Set<DataContainerCodecPrototype<?>> cases = e.getValue();
159 if (cases.size() != 1) {
160 // Sort all possibilities by their FQCN to retain semi-predictable results
161 final List<DataContainerCodecPrototype<?>> list = new ArrayList<>(e.getValue());
162 list.sort(Comparator.comparing(proto -> proto.getBindingClass().getCanonicalName()));
163 ambiguousByCaseBuilder.putAll(e.getKey(), list);
165 unambiguousByCaseBuilder.put(e.getKey(), cases.iterator().next());
168 byCaseChildClass = unambiguousByCaseBuilder.build();
170 // Setup ambiguous tracking, if needed
171 ambiguousByCaseChildClass = ambiguousByCaseBuilder.build();
172 ambiguousByCaseChildWarnings = ambiguousByCaseChildClass.isEmpty() ? ImmutableSet.of()
173 : ConcurrentHashMap.newKeySet();
176 * Choice/Case mapping across groupings is compile-time unsafe and we therefore need to also track any
177 * CaseRuntimeTypes added to the choice in other contexts. This is necessary to discover when a case represents
178 * equivalent data in a different instantiation context.
180 * This is required due property of binding specification, that if choice is in grouping schema path location is
181 * lost, and users may use incorrect case class using copy builders.
183 final Map<Class<?>, DataContainerCodecPrototype<?>> bySubstitutionBuilder = new HashMap<>();
184 final var context = factory.getRuntimeContext();
185 for (var caseType : context.getTypes().allCaseChildren(choiceType)) {
186 final var caseName = caseType.getIdentifier();
187 if (!localCases.contains(caseName)) {
188 // FIXME: do not rely on class loading here, the check we are performing should be possible on
189 // GeneratedType only -- or it can be provided by BindingRuntimeTypes -- i.e. rather than
190 // 'allCaseChildren()' it would calculate additional mappings we can use off-the-bat.
191 final Class<?> substitution = loadCase(context, caseType);
193 search: for (final Entry<Class<?>, DataContainerCodecPrototype<?>> real : byClassBuilder.entrySet()) {
194 if (isSubstitutionFor(substitution, real.getKey())) {
195 bySubstitutionBuilder.put(substitution, real.getValue());
202 byClassBuilder.putAll(bySubstitutionBuilder);
203 byClass = ImmutableMap.copyOf(byClassBuilder);
206 private static DataContainerCodecPrototype<CaseRuntimeType> loadCase(final CodecContextFactory factory,
207 final CaseRuntimeType caseType) {
208 return DataContainerCodecPrototype.from(loadCase(factory.getRuntimeContext(), caseType), caseType, factory);
211 private static Class<?> loadCase(final BindingRuntimeContext context, final CaseRuntimeType caseType) {
212 final var className = caseType.getIdentifier();
214 return context.loadClass(className);
215 } catch (ClassNotFoundException e) {
216 throw new LinkageError("Failed to load class for " + className, e);
221 public WithStatus getSchema() {
222 // FIXME: Bad cast, we should be returning an EffectiveStatement perhaps?
223 return (WithStatus) getType().statement();
226 @SuppressWarnings("unchecked")
228 public <C extends DataObject> DataContainerCodecContext<C, ?> streamChild(final Class<C> childClass) {
229 final DataContainerCodecPrototype<?> child = byClass.get(childClass);
230 return (DataContainerCodecContext<C, ?>) childNonNull(child, childClass,
231 "Supplied class %s is not valid case in %s", childClass, bindingArg()).get();
234 @SuppressWarnings("unchecked")
236 public <C extends DataObject> Optional<DataContainerCodecContext<C, ?>> possibleStreamChild(
237 final Class<C> childClass) {
238 final DataContainerCodecPrototype<?> child = byClass.get(childClass);
240 return Optional.of((DataContainerCodecContext<C, ?>) child.get());
242 return Optional.empty();
245 Iterable<Class<?>> getCaseChildrenClasses() {
246 return Iterables.concat(byCaseChildClass.keySet(), ambiguousByCaseChildClass.keySet());
250 public NodeCodecContext yangPathArgumentChild(final YangInstanceIdentifier.PathArgument arg) {
251 final DataContainerCodecPrototype<?> cazeProto;
252 if (arg instanceof YangInstanceIdentifier.NodeIdentifierWithPredicates) {
253 cazeProto = byYangCaseChild.get(new NodeIdentifier(arg.getNodeType()));
255 cazeProto = byYangCaseChild.get(arg);
258 return childNonNull(cazeProto, arg, "Argument %s is not valid child of %s", arg, getSchema()).get()
259 .yangPathArgumentChild(arg);
263 @SuppressWarnings("unchecked")
264 @SuppressFBWarnings(value = "NP_NONNULL_RETURN_VIOLATION", justification = "See FIXME below")
265 public D deserialize(final NormalizedNode data) {
266 final ChoiceNode casted = checkDataArgument(ChoiceNode.class, data);
267 final NormalizedNode first = Iterables.getFirst(casted.body(), null);
270 // FIXME: this needs to be sorted out
273 final DataContainerCodecPrototype<?> caze = byYangCaseChild.get(first.getIdentifier());
274 return (D) caze.get().deserialize(data);
278 protected Object deserializeObject(final NormalizedNode normalizedNode) {
279 return deserialize(normalizedNode);
283 public PathArgument deserializePathArgument(final YangInstanceIdentifier.PathArgument arg) {
284 checkArgument(getDomPathArgument().equals(arg));
289 public YangInstanceIdentifier.PathArgument serializePathArgument(final PathArgument arg) {
290 // FIXME: check for null, since binding container is null.
291 return getDomPathArgument();
294 DataContainerCodecContext<?, ?> getCaseByChildClass(final @NonNull Class<? extends DataObject> type) {
295 DataContainerCodecPrototype<?> result = byCaseChildClass.get(type);
296 if (result == null) {
297 // We have not found an unambiguous result, try ambiguous ones
298 final List<DataContainerCodecPrototype<?>> inexact = ambiguousByCaseChildClass.get(type);
299 if (!inexact.isEmpty()) {
300 result = inexact.get(0);
301 // Issue a warning, but only once so as not to flood the logs
302 if (ambiguousByCaseChildWarnings.add(type)) {
303 LOG.warn("Ambiguous reference {} to child of {} resolved to {}, the first case in {} This mapping "
304 + "is not guaranteed to be stable and is subject to variations based on runtime "
305 + "circumstances. Please see the stack trace for hints about the source of ambiguity.",
306 type, bindingArg(), result.getBindingClass(),
307 Lists.transform(inexact, DataContainerCodecPrototype::getBindingClass), new Throwable());
312 return childNonNull(result, type, "Class %s is not child of any cases for %s", type, bindingArg()).get();
316 * Scans supplied class and returns an iterable of all data children classes.
319 * YANG Modeled Entity derived from DataContainer
320 * @return Iterable of all data children, which have YANG modeled entity
322 // FIXME: MDSAL-780: replace use of this method
323 @SuppressWarnings("unchecked")
324 private static Iterable<Class<? extends DataObject>> getChildrenClasses(final Class<? extends DataContainer> type) {
325 checkArgument(type != null, "Target type must not be null");
326 checkArgument(DataContainer.class.isAssignableFrom(type), "Supplied type must be derived from DataContainer");
327 List<Class<? extends DataObject>> ret = new LinkedList<>();
328 for (Method method : type.getMethods()) {
329 Optional<Class<? extends DataContainer>> entity = getYangModeledReturnType(method, Naming.GETTER_PREFIX);
330 if (entity.isPresent()) {
331 ret.add((Class<? extends DataObject>) entity.orElseThrow());