binding/mdsal-binding-dom-adapter/src/main/java/org/opendaylight/mdsal/binding/dom/adapter/BindingToNormalizedNodeCodec.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   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
   7  */
   8 package org.opendaylight.mdsal.binding.dom.adapter;
   9
  10 import static com.google.common.base.Preconditions.checkArgument;
  11 import static com.google.common.base.Preconditions.checkState;
  12 import static java.util.Objects.requireNonNull;
  13
  14 import com.google.common.cache.CacheBuilder;
  15 import com.google.common.cache.CacheLoader;
  16 import com.google.common.cache.LoadingCache;
  17 import com.google.common.collect.ImmutableBiMap;
  18 import com.google.common.collect.ImmutableSet;
  19 import com.google.common.collect.Iterators;
  20 import java.lang.reflect.Method;
  21 import java.time.Instant;
  22 import java.util.AbstractMap.SimpleEntry;
  23 import java.util.Collection;
  24 import java.util.HashSet;
  25 import java.util.Map.Entry;
  26 import java.util.Optional;
  27 import java.util.Set;
  28 import java.util.concurrent.TimeUnit;
  29 import java.util.function.Function;
  30 import java.util.stream.Collectors;
  31 import javax.annotation.PreDestroy;
  32 import javax.inject.Inject;
  33 import javax.inject.Singleton;
  34 import org.eclipse.jdt.annotation.NonNull;
  35 import org.opendaylight.mdsal.binding.api.DataTreeIdentifier;
  36 import org.opendaylight.mdsal.binding.dom.codec.api.BindingCodecTree;
  37 import org.opendaylight.mdsal.binding.dom.codec.api.BindingCodecTreeFactory;
  38 import org.opendaylight.mdsal.binding.dom.codec.api.BindingCodecTreeNode;
  39 import org.opendaylight.mdsal.binding.dom.codec.api.BindingDataObjectCodecTreeNode;
  40 import org.opendaylight.mdsal.binding.dom.codec.api.BindingLazyContainerNode;
  41 import org.opendaylight.mdsal.binding.dom.codec.api.BindingNormalizedNodeSerializer;
  42 import org.opendaylight.mdsal.binding.dom.codec.api.MissingSchemaException;
  43 import org.opendaylight.mdsal.binding.dom.codec.impl.BindingNormalizedNodeCodecRegistry;
  44 import org.opendaylight.mdsal.binding.generator.api.BindingRuntimeContext;
  45 import org.opendaylight.mdsal.binding.generator.api.BindingRuntimeGenerator;
  46 import org.opendaylight.mdsal.binding.generator.api.ClassLoadingStrategy;
  47 import org.opendaylight.mdsal.binding.spec.naming.BindingMapping;
  48 import org.opendaylight.mdsal.binding.spec.reflect.BindingReflections;
  49 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  50 import org.opendaylight.mdsal.dom.api.DOMSchemaService;
  51 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  52 import org.opendaylight.yangtools.yang.binding.Action;
  53 import org.opendaylight.yangtools.yang.binding.DataContainer;
  54 import org.opendaylight.yangtools.yang.binding.DataObject;
  55 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  56 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier.PathArgument;
  57 import org.opendaylight.yangtools.yang.binding.Notification;
  58 import org.opendaylight.yangtools.yang.binding.RpcInput;
  59 import org.opendaylight.yangtools.yang.binding.RpcOutput;
  60 import org.opendaylight.yangtools.yang.binding.RpcService;
  61 import org.opendaylight.yangtools.yang.common.QNameModule;
  62 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  63 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  64 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  65 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  66 import org.opendaylight.yangtools.yang.data.impl.codec.DeserializationException;
  67 import org.opendaylight.yangtools.yang.data.impl.schema.Builders;
  68 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
  69 import org.opendaylight.yangtools.yang.model.api.ActionDefinition;
  70 import org.opendaylight.yangtools.yang.model.api.DocumentedNode.WithStatus;
  71 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
  72 import org.opendaylight.yangtools.yang.model.api.Module;
  73 import org.opendaylight.yangtools.yang.model.api.NotificationDefinition;
  74 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
  75 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  76 import org.opendaylight.yangtools.yang.model.api.SchemaContextListener;
  77 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  78 import org.slf4j.Logger;
  79 import org.slf4j.LoggerFactory;
  80
  81 /**
  82  * A combinations of {@link BindingCodecTreeFactory} and {@link BindingNormalizedNodeSerializer}, with internal
  83  * caching of instance identifiers.
  84  *
  85  * <p>
  86  * NOTE: this class is non-final to allow controller adapter migration without duplicated code.
  87  */
  88 @Singleton
  89 public class BindingToNormalizedNodeCodec implements BindingCodecTreeFactory,
  90         BindingNormalizedNodeSerializer, SchemaContextListener, AutoCloseable {
  91
  92     private static final long WAIT_DURATION_SEC = 5;
  93     private static final Logger LOG = LoggerFactory.getLogger(BindingToNormalizedNodeCodec.class);
  94
  95     private final LoadingCache<InstanceIdentifier<?>, YangInstanceIdentifier> iiCache = CacheBuilder.newBuilder()
  96             .softValues().build(new CacheLoader<InstanceIdentifier<?>, YangInstanceIdentifier>() {
  97                 @Override
  98                 public YangInstanceIdentifier load(final InstanceIdentifier<?> key) {
  99                     return toYangInstanceIdentifierBlocking(key);
 100                 }
 101             });
 102     private final BindingNormalizedNodeCodecRegistry codecRegistry;
 103     private final ClassLoadingStrategy classLoadingStrategy;
 104     private final BindingRuntimeGenerator generator;
 105     private final FutureSchema futureSchema;
 106
 107     private ListenerRegistration<?> listenerRegistration;
 108
 109     @Inject
 110     public BindingToNormalizedNodeCodec(final BindingRuntimeGenerator generator,
 111             final ClassLoadingStrategy classLoadingStrategy, final BindingNormalizedNodeCodecRegistry codecRegistry) {
 112         this(generator, classLoadingStrategy, codecRegistry, false);
 113     }
 114
 115     public BindingToNormalizedNodeCodec(final BindingRuntimeGenerator generator,
 116             final ClassLoadingStrategy classLoadingStrategy, final BindingNormalizedNodeCodecRegistry codecRegistry,
 117             final boolean waitForSchema) {
 118         this.generator = requireNonNull(generator, "generator");
 119         this.classLoadingStrategy = requireNonNull(classLoadingStrategy, "classLoadingStrategy");
 120         this.codecRegistry = requireNonNull(codecRegistry, "codecRegistry");
 121         this.futureSchema = FutureSchema.create(WAIT_DURATION_SEC, TimeUnit.SECONDS, waitForSchema);
 122     }
 123
 124     public static BindingToNormalizedNodeCodec newInstance(final BindingRuntimeGenerator generator,
 125             final ClassLoadingStrategy classLoadingStrategy, final DOMSchemaService schemaService) {
 126         final BindingNormalizedNodeCodecRegistry codecRegistry = new BindingNormalizedNodeCodecRegistry();
 127         BindingToNormalizedNodeCodec instance = new BindingToNormalizedNodeCodec(generator, classLoadingStrategy,
 128             codecRegistry, true);
 129         instance.listenerRegistration = schemaService.registerSchemaContextListener(instance);
 130         return instance;
 131     }
 132
 133     protected YangInstanceIdentifier toYangInstanceIdentifierBlocking(
 134             final InstanceIdentifier<? extends DataObject> binding) {
 135         try {
 136             return codecRegistry.toYangInstanceIdentifier(binding);
 137         } catch (final MissingSchemaException e) {
 138             waitForSchema(decompose(binding), e);
 139             return codecRegistry.toYangInstanceIdentifier(binding);
 140         }
 141     }
 142
 143     /**
 144      * Translates supplied Binding Instance Identifier into NormalizedNode
 145      * instance identifier.
 146      *
 147      * @param binding
 148      *            Binding Instance Identifier
 149      * @return DOM Instance Identifier
 150      * @throws IllegalArgumentException
 151      *             If supplied Instance Identifier is not valid.
 152      */
 153     public final YangInstanceIdentifier toNormalized(final InstanceIdentifier<? extends DataObject> binding) {
 154         return codecRegistry.toYangInstanceIdentifier(binding);
 155     }
 156
 157     @Override
 158     public final YangInstanceIdentifier toYangInstanceIdentifier(final InstanceIdentifier<?> binding) {
 159         return codecRegistry.toYangInstanceIdentifier(binding);
 160     }
 161
 162     protected YangInstanceIdentifier toYangInstanceIdentifierCached(final InstanceIdentifier<?> binding) {
 163         return iiCache.getUnchecked(binding);
 164     }
 165
 166     @Override
 167     public final <T extends DataObject> Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> toNormalizedNode(
 168             final InstanceIdentifier<T> path, final T data) {
 169         try {
 170             return codecRegistry.toNormalizedNode(path, data);
 171         } catch (final MissingSchemaException e) {
 172             waitForSchema(decompose(path), e);
 173             return codecRegistry.toNormalizedNode(path, data);
 174         }
 175     }
 176
 177     /**
 178      * Converts Binding Map.Entry to DOM Map.Entry.
 179      *
 180      * <p>
 181      * Same as {@link #toNormalizedNode(InstanceIdentifier, DataObject)}.
 182      *
 183      * @param binding Map Entry with InstanceIdentifier as key and DataObject as value.
 184      * @return DOM Map Entry with {@link YangInstanceIdentifier} as key and {@link NormalizedNode}
 185      *         as value.
 186      */
 187     @SuppressWarnings({"unchecked", "rawtypes"})
 188     public final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> toNormalizedNode(
 189             final Entry<InstanceIdentifier<? extends DataObject>, DataObject> binding) {
 190         return toNormalizedNode((InstanceIdentifier) binding.getKey(), binding.getValue());
 191     }
 192
 193     @Override
 194     public final Entry<InstanceIdentifier<?>, DataObject> fromNormalizedNode(final YangInstanceIdentifier path,
 195             final NormalizedNode<?, ?> data) {
 196         return codecRegistry.fromNormalizedNode(path, data);
 197     }
 198
 199     @Override
 200     public final Notification fromNormalizedNodeNotification(final SchemaPath path, final ContainerNode data) {
 201         return codecRegistry.fromNormalizedNodeNotification(path, data);
 202     }
 203
 204     @Override
 205     public final Notification fromNormalizedNodeNotification(final SchemaPath path, final ContainerNode data,
 206             final Instant eventInstant) {
 207         return codecRegistry.fromNormalizedNodeNotification(path, data, eventInstant);
 208     }
 209
 210     @Override
 211     public final DataObject fromNormalizedNodeRpcData(final SchemaPath path, final ContainerNode data) {
 212         return codecRegistry.fromNormalizedNodeRpcData(path, data);
 213     }
 214
 215     @Override
 216     public <T extends RpcInput> T fromNormalizedNodeActionInput(final Class<? extends Action<?, ?, ?>> action,
 217             final ContainerNode input) {
 218         return codecRegistry.fromNormalizedNodeActionInput(action, input);
 219     }
 220
 221     @Override
 222     public <T extends RpcOutput> T fromNormalizedNodeActionOutput(final Class<? extends Action<?, ?, ?>> action,
 223             final ContainerNode output) {
 224         return codecRegistry.fromNormalizedNodeActionOutput(action, output);
 225     }
 226
 227     @Override
 228     public final InstanceIdentifier<?> fromYangInstanceIdentifier(final YangInstanceIdentifier dom) {
 229         return codecRegistry.fromYangInstanceIdentifier(dom);
 230     }
 231
 232     @Override
 233     public final ContainerNode toNormalizedNodeNotification(final Notification data) {
 234         return codecRegistry.toNormalizedNodeNotification(data);
 235     }
 236
 237     @Override
 238     public final ContainerNode toNormalizedNodeRpcData(final DataContainer data) {
 239         return codecRegistry.toNormalizedNodeRpcData(data);
 240     }
 241
 242     @Override
 243     public ContainerNode toNormalizedNodeActionInput(final Class<? extends Action<?, ?, ?>> action,
 244             final RpcInput input) {
 245         return codecRegistry.toNormalizedNodeActionInput(action, input);
 246     }
 247
 248     @Override
 249     public ContainerNode toNormalizedNodeActionOutput(final Class<? extends Action<?, ?, ?>> action,
 250             final RpcOutput output) {
 251         return codecRegistry.toNormalizedNodeActionOutput(action, output);
 252     }
 253
 254     @Override
 255     public BindingLazyContainerNode<RpcInput> toLazyNormalizedNodeActionInput(
 256             final Class<? extends Action<?, ?, ?>> action, final NodeIdentifier identifier, final RpcInput input) {
 257         return codecRegistry.toLazyNormalizedNodeActionInput(action, identifier, input);
 258     }
 259
 260     @Override
 261     public BindingLazyContainerNode<RpcOutput> toLazyNormalizedNodeActionOutput(
 262             final Class<? extends Action<?, ?, ?>> action, final NodeIdentifier identifier, final RpcOutput output) {
 263         return codecRegistry.toLazyNormalizedNodeActionOutput(action, identifier, output);
 264     }
 265
 266     /**
 267      * Returns a Binding-Aware instance identifier from normalized
 268      * instance-identifier if it is possible to create representation.
 269      *
 270      * <p>
 271      * Returns Optional.empty for cases where target is mixin node except
 272      * augmentation.
 273      */
 274     public final Optional<InstanceIdentifier<? extends DataObject>> toBinding(final YangInstanceIdentifier normalized)
 275                     throws DeserializationException {
 276         try {
 277             return Optional.ofNullable(codecRegistry.fromYangInstanceIdentifier(normalized));
 278         } catch (final IllegalArgumentException e) {
 279             return Optional.empty();
 280         }
 281     }
 282
 283     public final Optional<Entry<InstanceIdentifier<? extends DataObject>, DataObject>> toBinding(
 284             final @NonNull Entry<YangInstanceIdentifier, ? extends NormalizedNode<?, ?>> normalized)
 285                     throws DeserializationException {
 286         try {
 287             /*
 288              * This cast is required, due to generics behaviour in openjdk / oracle javac.
 289              *
 290              * <p>
 291              * InstanceIdentifier has definition InstanceIdentifier<T extends DataObject>,
 292              * this means '?' is always  <? extends DataObject>. Eclipse compiler
 293              * is able to determine this relationship and treats
 294              * Entry<InstanceIdentifier<?>, DataObject> and Entry<InstanceIdentifier<? extends DataObject, DataObject>
 295              * as assignable. However openjdk / oracle javac treats this two types
 296              * as incompatible and issues a compile error.
 297              *
 298              * <p>
 299              * It is safe to lose generic information and cast it to other generic signature.
 300              */
 301             @SuppressWarnings("unchecked")
 302             final Entry<InstanceIdentifier<? extends DataObject>, DataObject> binding = Entry.class.cast(
 303                     codecRegistry.fromNormalizedNode(normalized.getKey(), normalized.getValue()));
 304             return Optional.ofNullable(binding);
 305         } catch (final IllegalArgumentException e) {
 306             return Optional.empty();
 307         }
 308     }
 309
 310     @Override
 311     public void onGlobalContextUpdated(final SchemaContext context) {
 312         final BindingRuntimeContext runtimeContext = BindingRuntimeContext.create(
 313             generator.generateTypeMapping(context), classLoadingStrategy);
 314         codecRegistry.onBindingRuntimeContextUpdated(runtimeContext);
 315         futureSchema.onRuntimeContextUpdated(runtimeContext);
 316     }
 317
 318     /**
 319      * Deprecated.
 320      *
 321      * @deprecated Use {@link BindingNormalizedNodeCodecRegistry#deserializeFunction} instead.
 322      */
 323     @Deprecated
 324     public final <T extends DataObject> Function<Optional<NormalizedNode<?, ?>>, Optional<T>> deserializeFunction(
 325             final InstanceIdentifier<T> path) {
 326         return codecRegistry.deserializeFunction(path)::apply;
 327     }
 328
 329     public final BindingNormalizedNodeCodecRegistry getCodecRegistry() {
 330         return codecRegistry;
 331     }
 332
 333     @Override
 334     @PreDestroy
 335     public void close() {
 336         if (listenerRegistration != null) {
 337             listenerRegistration.close();
 338         }
 339     }
 340
 341     public final BindingNormalizedNodeCodecRegistry getCodecFactory() {
 342         return codecRegistry;
 343     }
 344
 345     // FIXME: This should be probably part of Binding Runtime context
 346     public final ImmutableBiMap<Method, SchemaPath> getRpcMethodToSchemaPath(final Class<? extends RpcService> key) {
 347         final Module module = getModuleBlocking(key);
 348         final ImmutableBiMap.Builder<Method, SchemaPath> ret = ImmutableBiMap.builder();
 349         try {
 350             for (final RpcDefinition rpcDef : module.getRpcs()) {
 351                 final Method method = findRpcMethod(key, rpcDef);
 352                 ret.put(method, rpcDef.getPath());
 353             }
 354         } catch (final NoSuchMethodException e) {
 355             throw new IllegalStateException("Rpc defined in model does not have representation in generated class.", e);
 356         }
 357         return ret.build();
 358     }
 359
 360     protected ImmutableBiMap<Method, RpcDefinition> getRpcMethodToSchema(final Class<? extends RpcService> key) {
 361         final Module module = getModuleBlocking(key);
 362         final ImmutableBiMap.Builder<Method, RpcDefinition> ret = ImmutableBiMap.builder();
 363         try {
 364             for (final RpcDefinition rpcDef : module.getRpcs()) {
 365                 final Method method = findRpcMethod(key, rpcDef);
 366                 ret.put(method, rpcDef);
 367             }
 368         } catch (final NoSuchMethodException e) {
 369             throw new IllegalStateException("Rpc defined in model does not have representation in generated class.", e);
 370         }
 371         return ret.build();
 372     }
 373
 374     private Module getModuleBlocking(final Class<?> modeledClass) {
 375         final QNameModule moduleName = BindingReflections.getQNameModule(modeledClass);
 376         BindingRuntimeContext localRuntimeContext = runtimeContext();
 377         Module module = localRuntimeContext == null ? null :
 378             localRuntimeContext.getSchemaContext().findModule(moduleName).orElse(null);
 379         if (module == null && futureSchema.waitForSchema(moduleName)) {
 380             localRuntimeContext = runtimeContext();
 381             checkState(localRuntimeContext != null, "BindingRuntimeContext is not available.");
 382             module = localRuntimeContext.getSchemaContext().findModule(moduleName).orElse(null);
 383         }
 384         if (module != null) {
 385             return module;
 386         }
 387
 388         LOG.debug("Schema for {} is not available; expected module name: {}; BindingRuntimeContext: {}",
 389                 modeledClass, moduleName, localRuntimeContext);
 390         throw new IllegalStateException(String.format("Schema for %s is not available; expected module name: %s; "
 391                 + "full BindingRuntimeContext available in debug log", modeledClass, moduleName));
 392     }
 393
 394     private void waitForSchema(final Collection<Class<?>> binding, final MissingSchemaException exception) {
 395         LOG.warn("Blocking thread to wait for schema convergence updates for {} {}", futureSchema.getDuration(),
 396             futureSchema.getUnit());
 397         if (!futureSchema.waitForSchema(binding)) {
 398             throw exception;
 399         }
 400     }
 401
 402     private Method findRpcMethod(final Class<? extends RpcService> key, final RpcDefinition rpcDef)
 403             throws NoSuchMethodException {
 404         final String methodName = BindingMapping.getRpcMethodName(rpcDef.getQName());
 405         final Class<?> inputClz = runtimeContext().getClassForSchema(rpcDef.getInput());
 406         return key.getMethod(methodName, inputClz);
 407     }
 408
 409     @Override
 410     public final BindingCodecTree create(final BindingRuntimeContext context) {
 411         return codecRegistry.create(context);
 412     }
 413
 414     protected @NonNull Entry<InstanceIdentifier<?>, BindingDataObjectCodecTreeNode<?>> getSubtreeCodec(
 415             final YangInstanceIdentifier domIdentifier) {
 416
 417         final BindingCodecTree currentCodecTree = codecRegistry.getCodecContext();
 418         final InstanceIdentifier<?> bindingPath = codecRegistry.fromYangInstanceIdentifier(domIdentifier);
 419         checkArgument(bindingPath != null);
 420         /**
 421          * If we are able to deserialize YANG instance identifier, getSubtreeCodec must
 422          * return non-null value.
 423          */
 424         final BindingDataObjectCodecTreeNode<?> codecContext = currentCodecTree.getSubtreeCodec(bindingPath);
 425         return new SimpleEntry<>(bindingPath, codecContext);
 426     }
 427
 428     @SuppressWarnings("unchecked")
 429     public final Set<Class<? extends Notification>> getNotificationClasses(final Set<SchemaPath> interested) {
 430         final Set<Class<? extends Notification>> result = new HashSet<>();
 431         final BindingRuntimeContext runtimeContext = runtimeContext();
 432         for (final NotificationDefinition notification : runtimeContext.getSchemaContext().getNotifications()) {
 433             if (interested.contains(notification.getPath())) {
 434                 try {
 435                     result.add((Class<? extends Notification>) runtimeContext.getClassForSchema(notification));
 436                 } catch (final IllegalStateException e) {
 437                     // Ignore
 438                     LOG.warn("Class for {} is currently not known.", notification.getPath(), e);
 439                 }
 440             }
 441         }
 442         return result;
 443     }
 444
 445     SchemaPath getActionPath(final Class<? extends Action<?, ?, ?>> type) {
 446         final ActionDefinition schema = runtimeContext().getActionDefinition(type);
 447         checkArgument(schema != null, "Failed to find schema for %s", type);
 448         return schema.getPath();
 449     }
 450
 451     private BindingRuntimeContext runtimeContext() {
 452         return futureSchema.runtimeContext();
 453     }
 454
 455     private static Collection<Class<?>> decompose(final InstanceIdentifier<?> path) {
 456         return ImmutableSet.copyOf(Iterators.transform(path.getPathArguments().iterator(), PathArgument::getType));
 457     }
 458
 459     protected NormalizedNode<?, ?> instanceIdentifierToNode(final YangInstanceIdentifier parentPath) {
 460         return ImmutableNodes.fromInstanceId(runtimeContext().getSchemaContext(), parentPath);
 461     }
 462
 463     /**
 464      * This method creates an empty list container of a particular type.
 465      *
 466      * @deprecated This method is not generally useful, as empty lists do not convey information in YANG (they are
 467      *             equivalent to non-present lists). It also leaks implementation details to a broader scope and should
 468      *             never have been public in the first place.
 469      */
 470     @Deprecated
 471     public NormalizedNode<?, ?> getDefaultNodeFor(final YangInstanceIdentifier parentMapPath) {
 472         final BindingCodecTreeNode mapCodec = requireNonNull(
 473                 codecRegistry.getCodecContext().getSubtreeCodec(parentMapPath),
 474                 "Codec not found for yang instance identifier: " + parentMapPath);
 475         final WithStatus schema = mapCodec.getSchema();
 476         if (schema instanceof ListSchemaNode) {
 477             final ListSchemaNode castedSchema = (ListSchemaNode) schema;
 478             return castedSchema.isUserOrdered() ? Builders.orderedMapBuilder(castedSchema).build()
 479                     : Builders.mapBuilder(castedSchema).build();
 480         }
 481         throw new IllegalArgumentException("Path does not point to list schema node");
 482     }
 483
 484     protected Collection<DOMDataTreeIdentifier> toDOMDataTreeIdentifiers(
 485             final Collection<DataTreeIdentifier<?>> subtrees) {
 486         return subtrees.stream().map(this::toDOMDataTreeIdentifier).collect(Collectors.toSet());
 487     }
 488
 489     protected DOMDataTreeIdentifier toDOMDataTreeIdentifier(final DataTreeIdentifier<?> path) {
 490         final YangInstanceIdentifier domPath = toYangInstanceIdentifierBlocking(path.getRootIdentifier());
 491         return new DOMDataTreeIdentifier(path.getDatastoreType(), domPath);
 492     }
 493 }