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.ImmutableCollection;
13 import com.google.common.collect.ImmutableListMultimap;
14 import com.google.common.collect.ImmutableMap;
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 edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
21 import java.util.ArrayList;
22 import java.util.Comparator;
23 import java.util.HashMap;
24 import java.util.HashSet;
25 import java.util.LinkedList;
26 import java.util.Optional;
28 import java.util.concurrent.ConcurrentHashMap;
29 import org.eclipse.jdt.annotation.NonNull;
30 import org.opendaylight.mdsal.binding.dom.codec.api.BindingDataObjectCodecTreeNode;
31 import org.opendaylight.mdsal.binding.dom.codec.api.BindingNormalizedNodeCachingCodec;
32 import org.opendaylight.mdsal.binding.model.api.JavaTypeName;
33 import org.opendaylight.mdsal.binding.runtime.api.BindingRuntimeContext;
34 import org.opendaylight.mdsal.binding.runtime.api.CaseRuntimeType;
35 import org.opendaylight.mdsal.binding.runtime.api.ChoiceRuntimeType;
36 import org.opendaylight.yangtools.yang.binding.BindingObject;
37 import org.opendaylight.yangtools.yang.binding.DataContainer;
38 import org.opendaylight.yangtools.yang.binding.DataObject;
39 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier.PathArgument;
40 import org.opendaylight.yangtools.yang.binding.contract.Naming;
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.YangInstanceIdentifier.NodeIdentifierWithPredicates;
44 import org.opendaylight.yangtools.yang.data.api.schema.ChoiceNode;
45 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
46 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
47 import org.opendaylight.yangtools.yang.model.api.DocumentedNode.WithStatus;
48 import org.slf4j.Logger;
49 import org.slf4j.LoggerFactory;
52 * This is a bit tricky. DataObject addressing does not take into account choice/case statements, and hence given:
63 * we will see {@code Baz extends ChildOf<Foo>}, which is how the users would address it in InstanceIdentifier terms.
64 * The implicit assumption being made is that {@code Baz} identifies a particular instantiation and hence provides
65 * unambiguous reference to an effective schema statement.
68 * Unfortunately this does not quite work with groupings, as their generation has changed: we do not have interfaces
69 * that would capture grouping instantiations, hence we do not have a proper addressing point and users need to specify
70 * the interfaces generated in the grouping's definition. These can be very much ambiguous, as a {@code grouping} can be
71 * used in multiple modules independently within an {@code augment} targeting {@code choice}, as each instantiation is
72 * guaranteed to have a unique namespace -- but we do not have the appropriate instantiations of those nodes.
75 * To address this issue we have a two-class lookup mechanism, which relies on the interface generated for the
76 * {@code case} statement to act as the namespace anchor bridging the nodes inside the grouping to the namespace in
77 * which they are instantiated.
80 * Furthermore downstream code relies on historical mechanics, which would guess what the instantiation is, silently
81 * assuming the ambiguity is theoretical and does not occur in practice.
84 * This leads to three classes of addressing, in order descending performance requirements.
86 * <li>Direct DataObject, where we name an exact child</li>
87 * <li>Case DataObject + Grouping DataObject</li>
88 * <li>Grouping DataObject, which is ambiguous</li>
91 * {@link #byCaseChildClass} supports direct DataObject mapping and contains only unambiguous children, while
92 * {@link #byClass} supports indirect mapping and contains {@code case} sub-statements.
94 * {@link #ambiguousByCaseChildClass} contains ambiguous mappings, for which we end up issuing warnings. We track each
95 * ambiguous reference and issue warn once when they are encountered -- tracking warning information in
96 * {@link #ambiguousByCaseChildWarnings}.
98 final class ChoiceNodeCodecContext<D extends DataObject> extends DataContainerCodecContext<D, ChoiceRuntimeType>
99 implements BindingDataObjectCodecTreeNode<D> {
100 private static final Logger LOG = LoggerFactory.getLogger(ChoiceNodeCodecContext.class);
102 private final ImmutableMap<NodeIdentifier, DataContainerCodecPrototype<?>> byYangCaseChild;
103 private final ImmutableListMultimap<Class<?>, DataContainerCodecPrototype<?>> ambiguousByCaseChildClass;
104 private final ImmutableMap<Class<?>, DataContainerCodecPrototype<?>> byCaseChildClass;
105 private final ImmutableMap<Class<?>, DataContainerCodecPrototype<?>> byClass;
106 private final Set<Class<?>> ambiguousByCaseChildWarnings;
108 ChoiceNodeCodecContext(final DataContainerCodecPrototype<ChoiceRuntimeType> prototype) {
110 final var byYangCaseChildBuilder = new HashMap<NodeIdentifier, DataContainerCodecPrototype<?>>();
111 final var byClassBuilder = new HashMap<Class<?>, DataContainerCodecPrototype<?>>();
112 final var childToCase = SetMultimapBuilder.hashKeys().hashSetValues()
113 .<Class<?>, DataContainerCodecPrototype<?>>build();
115 // Load case statements valid in this choice and keep track of their names
116 final var choiceType = prototype.getType();
117 final var factory = prototype.getFactory();
118 final var localCases = new HashSet<JavaTypeName>();
119 for (var caseType : choiceType.validCaseChildren()) {
120 final var caseProto = new CaseNodeCodecContext.Prototype(loadCase(factory.getRuntimeContext(), caseType),
123 localCases.add(caseType.getIdentifier());
124 byClassBuilder.put(caseProto.getBindingClass(), caseProto);
126 // Updates collection of case children
127 @SuppressWarnings("unchecked")
128 final var cazeCls = (Class<? extends DataObject>) caseProto.getBindingClass();
129 for (var cazeChild : getChildrenClasses(cazeCls)) {
130 childToCase.put(cazeChild, caseProto);
132 // Updates collection of YANG instance identifier to case
133 for (var stmt : caseProto.getType().statement().effectiveSubstatements()) {
134 if (stmt instanceof DataSchemaNode cazeChild) {
135 byYangCaseChildBuilder.put(NodeIdentifier.create(cazeChild.getQName()), caseProto);
139 byYangCaseChild = ImmutableMap.copyOf(byYangCaseChildBuilder);
141 // Move unambiguous child->case mappings to byCaseChildClass, removing them from childToCase
142 final var ambiguousByCaseBuilder = ImmutableListMultimap.<Class<?>, DataContainerCodecPrototype<?>>builder();
143 final var unambiguousByCaseBuilder = ImmutableMap.<Class<?>, DataContainerCodecPrototype<?>>builder();
144 for (var entry : Multimaps.asMap(childToCase).entrySet()) {
145 final var cases = entry.getValue();
146 if (cases.size() != 1) {
147 // Sort all possibilities by their FQCN to retain semi-predictable results
148 final var list = new ArrayList<>(entry.getValue());
149 list.sort(Comparator.comparing(proto -> proto.getBindingClass().getCanonicalName()));
150 ambiguousByCaseBuilder.putAll(entry.getKey(), list);
152 unambiguousByCaseBuilder.put(entry.getKey(), cases.iterator().next());
155 byCaseChildClass = unambiguousByCaseBuilder.build();
157 // Setup ambiguous tracking, if needed
158 ambiguousByCaseChildClass = ambiguousByCaseBuilder.build();
159 ambiguousByCaseChildWarnings = ambiguousByCaseChildClass.isEmpty() ? ImmutableSet.of()
160 : ConcurrentHashMap.newKeySet();
163 * Choice/Case mapping across groupings is compile-time unsafe and we therefore need to also track any
164 * CaseRuntimeTypes added to the choice in other contexts. This is necessary to discover when a case represents
165 * equivalent data in a different instantiation context.
167 * This is required due property of binding specification, that if choice is in grouping schema path location is
168 * lost, and users may use incorrect case class using copy builders.
170 final var bySubstitutionBuilder = new HashMap<Class<?>, DataContainerCodecPrototype<?>>();
171 final var context = factory.getRuntimeContext();
172 for (var caseType : context.getTypes().allCaseChildren(choiceType)) {
173 final var caseName = caseType.getIdentifier();
174 if (!localCases.contains(caseName)) {
175 // FIXME: do not rely on class loading here, the check we are performing should be possible on
176 // GeneratedType only -- or it can be provided by BindingRuntimeTypes -- i.e. rather than
177 // 'allCaseChildren()' it would calculate additional mappings we can use off-the-bat.
178 final var substitution = loadCase(context, caseType);
180 search: for (var real : byClassBuilder.entrySet()) {
181 if (isSubstitutionFor(substitution, real.getKey())) {
182 bySubstitutionBuilder.put(substitution, real.getValue());
189 byClassBuilder.putAll(bySubstitutionBuilder);
190 byClass = ImmutableMap.copyOf(byClassBuilder);
193 private static Class<?> loadCase(final BindingRuntimeContext context, final CaseRuntimeType caseType) {
194 final var className = caseType.getIdentifier();
196 return context.loadClass(className);
197 } catch (ClassNotFoundException e) {
198 throw new LinkageError("Failed to load class for " + className, e);
203 public WithStatus getSchema() {
204 // FIXME: Bad cast, we should be returning an EffectiveStatement perhaps?
205 return (WithStatus) getType().statement();
208 @SuppressWarnings("unchecked")
210 public <C extends DataObject> DataContainerCodecContext<C, ?> streamChild(final Class<C> childClass) {
211 final var child = byClass.get(childClass);
212 return (DataContainerCodecContext<C, ?>) childNonNull(child, childClass,
213 "Supplied class %s is not valid case in %s", childClass, bindingArg()).get();
216 @SuppressWarnings("unchecked")
218 public <C extends DataObject> Optional<DataContainerCodecContext<C, ?>> possibleStreamChild(
219 final Class<C> childClass) {
220 final var child = byClass.get(childClass);
222 return Optional.of((DataContainerCodecContext<C, ?>) child.get());
224 return Optional.empty();
227 Iterable<Class<?>> getCaseChildrenClasses() {
228 return Iterables.concat(byCaseChildClass.keySet(), ambiguousByCaseChildClass.keySet());
232 public NodeCodecContext yangPathArgumentChild(final YangInstanceIdentifier.PathArgument arg) {
233 final DataContainerCodecPrototype<?> cazeProto;
234 if (arg instanceof NodeIdentifierWithPredicates) {
235 cazeProto = byYangCaseChild.get(new NodeIdentifier(arg.getNodeType()));
237 cazeProto = byYangCaseChild.get(arg);
240 return childNonNull(cazeProto, arg, "Argument %s is not valid child of %s", arg, getSchema()).get()
241 .yangPathArgumentChild(arg);
245 @SuppressWarnings("unchecked")
246 @SuppressFBWarnings(value = "NP_NONNULL_RETURN_VIOLATION", justification = "See FIXME below")
247 public D deserialize(final NormalizedNode data) {
248 final var casted = checkDataArgument(ChoiceNode.class, data);
249 final var first = Iterables.getFirst(casted.body(), null);
252 // FIXME: this needs to be sorted out
255 final var caze = byYangCaseChild.get(first.name());
256 return (D) caze.getDataObject().deserialize(data);
260 public NormalizedNode serialize(final D data) {
261 return serializeImpl(data);
265 protected Object deserializeObject(final NormalizedNode normalizedNode) {
266 return deserialize(normalizedNode);
270 public PathArgument deserializePathArgument(final YangInstanceIdentifier.PathArgument arg) {
271 checkArgument(getDomPathArgument().equals(arg));
276 public YangInstanceIdentifier.PathArgument serializePathArgument(final PathArgument arg) {
277 // FIXME: check for null, since binding container is null.
278 return getDomPathArgument();
282 public BindingNormalizedNodeCachingCodec<D> createCachingCodec(
283 final ImmutableCollection<Class<? extends BindingObject>> cacheSpecifier) {
284 return createCachingCodec(this, cacheSpecifier);
287 DataContainerCodecContext<?, ?> getCaseByChildClass(final @NonNull Class<? extends DataObject> type) {
288 var result = byCaseChildClass.get(type);
289 if (result == null) {
290 // We have not found an unambiguous result, try ambiguous ones
291 final var inexact = ambiguousByCaseChildClass.get(type);
292 if (!inexact.isEmpty()) {
293 result = inexact.get(0);
294 // Issue a warning, but only once so as not to flood the logs
295 if (ambiguousByCaseChildWarnings.add(type)) {
297 Ambiguous reference {} to child of {} resolved to {}, the first case in {} This mapping is \
298 not guaranteed to be stable and is subject to variations based on runtime circumstances. \
299 Please see the stack trace for hints about the source of ambiguity.""",
300 type, bindingArg(), result.getBindingClass(),
301 Lists.transform(inexact, DataContainerCodecPrototype::getBindingClass), new Throwable());
306 return childNonNull(result, type, "Class %s is not child of any cases for %s", type, bindingArg()).get();
310 * Scans supplied class and returns an iterable of all data children classes.
313 * YANG Modeled Entity derived from DataContainer
314 * @return Iterable of all data children, which have YANG modeled entity
316 // FIXME: MDSAL-780: replace use of this method
317 @SuppressWarnings("unchecked")
318 private static Iterable<Class<? extends DataObject>> getChildrenClasses(final Class<? extends DataContainer> type) {
319 checkArgument(type != null, "Target type must not be null");
320 checkArgument(DataContainer.class.isAssignableFrom(type), "Supplied type must be derived from DataContainer");
321 final var ret = new LinkedList<Class<? extends DataObject>>();
322 for (var method : type.getMethods()) {
323 final var entity = getYangModeledReturnType(method, Naming.GETTER_PREFIX);
324 if (entity.isPresent()) {
325 ret.add((Class<? extends DataObject>) entity.orElseThrow());