2 * Copyright (c) 2015 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.yangtools.yang.data.util;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.collect.ImmutableSet;
13 import com.google.common.collect.Iterables;
14 import java.util.Optional;
16 import java.util.stream.Collectors;
17 import org.eclipse.jdt.annotation.NonNull;
18 import org.eclipse.jdt.annotation.Nullable;
19 import org.opendaylight.yangtools.concepts.AbstractSimpleIdentifiable;
20 import org.opendaylight.yangtools.yang.common.QName;
21 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
22 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.AugmentationIdentifier;
23 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
24 import org.opendaylight.yangtools.yang.data.api.schema.AugmentationNode;
25 import org.opendaylight.yangtools.yang.data.api.schema.ChoiceNode;
26 import org.opendaylight.yangtools.yang.data.api.schema.LeafSetNode;
27 import org.opendaylight.yangtools.yang.data.api.schema.MapNode;
28 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
29 import org.opendaylight.yangtools.yang.data.api.schema.UnkeyedListNode;
30 import org.opendaylight.yangtools.yang.model.api.AnydataSchemaNode;
31 import org.opendaylight.yangtools.yang.model.api.AnyxmlSchemaNode;
32 import org.opendaylight.yangtools.yang.model.api.AugmentationSchemaNode;
33 import org.opendaylight.yangtools.yang.model.api.AugmentationTarget;
34 import org.opendaylight.yangtools.yang.model.api.CaseSchemaNode;
35 import org.opendaylight.yangtools.yang.model.api.ChoiceSchemaNode;
36 import org.opendaylight.yangtools.yang.model.api.ContainerLike;
37 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
38 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
39 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
40 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
41 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
42 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
43 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
44 import org.opendaylight.yangtools.yang.model.util.SchemaInferenceStack;
47 * Schema derived data providing necessary information for mapping between
48 * {@link org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode} and serialization format defined in RFC6020,
49 * since the mapping is not one-to-one.
51 * @param <T> Path Argument type
53 // FIXME: YANGTOOLS-1413: this really should be an interface, as there is a ton of non-trivial composition going on:
54 // - getDataSchemaNode() cannot return AugmentationSchemaNode, which is guarded by isMixinNode() and users should
55 // not be touching mixin details anyway
56 // - the idea of getIdentifier() is wrong -- if does the wrong thing for items of leaf-list and keyed list
57 // because those identifiers need a value. We also do not expect users to store the results in a Map, which
58 // defeats the idea of Identifiable
59 // - the generic argument is really an implementation detail and we really would like to also make dataSchemaNode
60 // (or rather: underlying SchemaNode) an argument. Both of these are not something users can influence and
61 // therefore we should not burden them with <?> on each reference to this class
62 public abstract class DataSchemaContextNode<T extends PathArgument> extends AbstractSimpleIdentifiable<T> {
63 // FIXME: this can be null only for AugmentationContextNode and in that case the interior part is handled by a
64 // separate field in DataContainerContextNode. We need to re-examine our base interface class hierarchy
65 // so that the underlying (effective in augment's case) SchemaNode is always available.
66 private final DataSchemaNode dataSchemaNode;
68 DataSchemaContextNode(final T identifier, final DataSchemaNode schema) {
70 this.dataSchemaNode = schema;
73 // FIXME: remove this constructor. Once we do, adjust 'enterChild' visibility to package-private
74 @Deprecated(forRemoval = true, since = "8.0.2")
75 protected DataSchemaContextNode(final T identifier, final SchemaNode schema) {
76 this(identifier, schema instanceof DataSchemaNode ? (DataSchemaNode) schema : null);
80 * This node is a {@link NormalizedNode} intermediate, not represented in RFC7950 XML encoding. This is typically
83 * <li>{@link AugmentationNode} backed by an {@link AugmentationSchemaNode}, or</li>
84 * <li>{@link ChoiceNode} backed by a {@link ChoiceSchemaNode}, or</li>
85 * <li>{@link LeafSetNode} backed by a {@link LeafListSchemaNode}, or</li>
86 * <li>{@link MapNode} backed by a {@link ListSchemaNode} with a non-empty
87 * {@link ListSchemaNode#getKeyDefinition()}, or</li>
88 * <li>{@link UnkeyedListNode} backed by a {@link ListSchemaNode} with an empty
89 * {@link ListSchemaNode#getKeyDefinition()}</li>
92 * @return {@code} false if this node corresponds to an XML element, or {@code true} if it is an encapsulation node.
94 public boolean isMixin() {
98 // FIXME: document this method
99 public boolean isKeyedEntry() {
103 // FIXME: this is counter-intuitive: anydata/anyxml are considered non-leaf. This method needs a better name and
104 // a proper description.
105 public abstract boolean isLeaf();
107 protected Set<QName> getQNameIdentifiers() {
108 return ImmutableSet.of(getIdentifier().getNodeType());
112 * Find a child node identifier by its {@link PathArgument}.
114 * @param child Child path argument
115 * @return A child node, or null if not found
117 // FIXME: document PathArgument type mismatch
118 public abstract @Nullable DataSchemaContextNode<?> getChild(PathArgument child);
121 * Find a child node identifier by its {code data tree} {@link QName}. This method returns intermediate nodes
122 * significant from {@link YangInstanceIdentifier} hierarchy of {@link PathArgument}s. If the returned node
123 * indicates {@code true} via {@link #isMixin()}, it represents a {@link NormalizedNode} encapsulation which is
124 * not visible in RFC7950 XML encoding, and a further call to this method with the same {@code child} argument will
125 * provide the next step.
127 * @param child Child data tree QName
128 * @return A child node, or null if not found
130 // FIXME: document child == null
131 public abstract @Nullable DataSchemaContextNode<?> getChild(QName child);
134 * Attempt to enter a child {@link DataSchemaContextNode} towards the {@link DataSchemaNode} child identified by
135 * specified {@code data tree} {@link QName}, adjusting provided {@code stack} with inference steps corresponding to
136 * the transition to the returned node. The stack is expected to be correctly pointing at this node's schema,
137 * otherwise the results of this method are undefined.
139 * @param stack {@link SchemaInferenceStack} to update
140 * @param child Child QName
141 * @return A DataSchemaContextNode on the path towards the specified child
142 * @throws NullPointerException if any argument is {@code null}
144 public final @Nullable DataSchemaContextNode<?> enterChild(final SchemaInferenceStack stack, final QName child) {
145 return enterChild(requireNonNull(child), requireNonNull(stack));
148 // FIXME: make this method package-private once the protected constructor is gone
149 protected abstract @Nullable DataSchemaContextNode<?> enterChild(@NonNull QName child,
150 @NonNull SchemaInferenceStack stack);
153 * Attempt to enter a child {@link DataSchemaContextNode} towards the {@link DataSchemaNode} child identified by
154 * specified {@link PathArgument}, adjusting provided {@code stack} with inference steps corresponding to
155 * the transition to the returned node. The stack is expected to be correctly pointing at this node's schema,
156 * otherwise the results of this method are undefined.
158 * @param stack {@link SchemaInferenceStack} to update
159 * @param child Child path argument
160 * @return A DataSchemaContextNode for the specified child
161 * @throws NullPointerException if any argument is {@code null}
163 public final @Nullable DataSchemaContextNode<?> enterChild(final SchemaInferenceStack stack,
164 final PathArgument child) {
165 return enterChild(requireNonNull(child), requireNonNull(stack));
168 // FIXME: make this method package-private once the protected constructor is gone
169 protected abstract @Nullable DataSchemaContextNode<?> enterChild(@NonNull PathArgument child,
170 @NonNull SchemaInferenceStack stack);
173 * Push this node into specified {@link SchemaInferenceStack}.
175 * @param stack {@link SchemaInferenceStack}
177 // FIXME: make this method package-private once the protected constructor is gone
178 protected void pushToStack(final @NonNull SchemaInferenceStack stack) {
179 // Accurate for most subclasses
180 stack.enterSchemaTree(getIdentifier().getNodeType());
184 public @Nullable DataSchemaNode getDataSchemaNode() {
185 return dataSchemaNode;
189 * Find a child node as identified by a {@link YangInstanceIdentifier} relative to this node.
191 * @param path Path towards the child node
192 * @return Child node if present, or empty when corresponding child is not found.
193 * @throws NullPointerException if {@code path} is null
195 public final @NonNull Optional<@NonNull DataSchemaContextNode<?>> findChild(
196 final @NonNull YangInstanceIdentifier path) {
197 DataSchemaContextNode<?> currentOp = this;
198 for (PathArgument arg : path.getPathArguments()) {
199 currentOp = currentOp.getChild(arg);
200 if (currentOp == null) {
201 return Optional.empty();
204 return Optional.of(currentOp);
207 static DataSchemaNode findChildSchemaNode(final DataNodeContainer parent, final QName child) {
208 final DataSchemaNode potential = parent.dataChildByName(child);
209 return potential == null ? findChoice(Iterables.filter(parent.getChildNodes(), ChoiceSchemaNode.class), child)
213 static DataSchemaContextNode<?> fromSchemaAndQNameChecked(final DataNodeContainer schema, final QName child) {
214 final DataSchemaNode result = findChildSchemaNode(schema, child);
215 // We try to look up if this node was added by augmentation
216 if (result != null && schema instanceof DataSchemaNode && result.isAugmenting()) {
217 return fromAugmentation(schema, (AugmentationTarget) schema, result);
219 return lenientOf(result);
222 // FIXME: this looks like it should be a Predicate on a stream with findFirst()
223 private static ChoiceSchemaNode findChoice(final Iterable<ChoiceSchemaNode> choices, final QName child) {
224 for (ChoiceSchemaNode choice : choices) {
225 // FIXME: this looks weird: what are we looking for again?
226 for (CaseSchemaNode caze : choice.getCases()) {
227 if (findChildSchemaNode(caze, child) != null) {
236 * Create AugmentationIdentifier from an AugmentationSchemaNode.
238 * @param schema Augmentation schema
239 * @return AugmentationIdentifier for the schema
240 * @throws NullPointerException if {@code schema} is null
242 public static AugmentationIdentifier augmentationIdentifierFrom(final AugmentationSchemaNode schema) {
243 return new AugmentationIdentifier(schema.getChildNodes().stream().map(DataSchemaNode::getQName)
244 .collect(Collectors.toSet()));
247 static @NonNull DataSchemaContextNode<?> of(final @NonNull DataSchemaNode schema) {
248 if (schema instanceof ContainerLike) {
249 return new ContainerContextNode((ContainerLike) schema);
250 } else if (schema instanceof ListSchemaNode) {
251 return fromListSchemaNode((ListSchemaNode) schema);
252 } else if (schema instanceof LeafSchemaNode) {
253 return new LeafContextNode((LeafSchemaNode) schema);
254 } else if (schema instanceof ChoiceSchemaNode) {
255 return new ChoiceNodeContextNode((ChoiceSchemaNode) schema);
256 } else if (schema instanceof LeafListSchemaNode) {
257 return fromLeafListSchemaNode((LeafListSchemaNode) schema);
258 } else if (schema instanceof AnydataSchemaNode) {
259 return new AnydataContextNode((AnydataSchemaNode) schema);
260 } else if (schema instanceof AnyxmlSchemaNode) {
261 return new AnyXmlContextNode((AnyxmlSchemaNode) schema);
263 throw new IllegalStateException("Unhandled schema " + schema);
267 // FIXME: do we tolerate null argument? do we tolerate unknown subclasses?
268 static @Nullable DataSchemaContextNode<?> lenientOf(final @Nullable DataSchemaNode schema) {
269 if (schema instanceof ContainerLike) {
270 return new ContainerContextNode((ContainerLike) schema);
271 } else if (schema instanceof ListSchemaNode) {
272 return fromListSchemaNode((ListSchemaNode) schema);
273 } else if (schema instanceof LeafSchemaNode) {
274 return new LeafContextNode((LeafSchemaNode) schema);
275 } else if (schema instanceof ChoiceSchemaNode) {
276 return new ChoiceNodeContextNode((ChoiceSchemaNode) schema);
277 } else if (schema instanceof LeafListSchemaNode) {
278 return fromLeafListSchemaNode((LeafListSchemaNode) schema);
279 } else if (schema instanceof AnydataSchemaNode) {
280 return new AnydataContextNode((AnydataSchemaNode) schema);
281 } else if (schema instanceof AnyxmlSchemaNode) {
282 return new AnyXmlContextNode((AnyxmlSchemaNode) schema);
289 * Returns a DataContextNodeOperation for provided child node
292 * If supplied child is added by Augmentation this operation returns a DataSchemaContextNode for augmentation,
293 * otherwise returns a DataSchemaContextNode for child as call for {@link #lenientOf(DataSchemaNode)}.
295 static @Nullable DataSchemaContextNode<?> fromAugmentation(final DataNodeContainer parent,
296 final AugmentationTarget parentAug, final DataSchemaNode child) {
297 for (AugmentationSchemaNode aug : parentAug.getAvailableAugmentations()) {
298 if (aug.findDataChildByName(child.getQName()).isPresent()) {
299 return new AugmentationContextNode(aug, parent);
302 return lenientOf(child);
306 * Get a {@link DataSchemaContextNode} for a particular {@link DataSchemaNode}.
308 * @param potential Backing DataSchemaNode
309 * @return A {@link DataSchemaContextNode}, or null if the input is {@code null} or of unhandled type
311 @Deprecated(forRemoval = true, since = "8.0.2")
312 public static @Nullable DataSchemaContextNode<?> fromDataSchemaNode(final DataSchemaNode potential) {
313 return lenientOf(potential);
316 private static @NonNull DataSchemaContextNode<?> fromListSchemaNode(final ListSchemaNode potential) {
317 var keyDefinition = potential.getKeyDefinition();
318 if (keyDefinition.isEmpty()) {
319 return new UnkeyedListMixinContextNode(potential);
320 } else if (potential.isUserOrdered()) {
321 return new OrderedMapMixinContextNode(potential);
323 return new UnorderedMapMixinContextNode(potential);
327 private static @NonNull DataSchemaContextNode<?> fromLeafListSchemaNode(final LeafListSchemaNode potential) {
328 if (potential.isUserOrdered()) {
329 return new OrderedLeafListMixinContextNode(potential);
331 return new UnorderedLeafListMixinContextNode(potential);
335 * Return a DataSchemaContextNode corresponding to specified {@link EffectiveModelContext}.
337 * @param ctx EffectiveModelContext
338 * @return A DataSchemaContextNode
339 * @throws NullPointerException if {@code ctx} is null
340 * @deprecated Use {@link DataSchemaContextTree#from(EffectiveModelContext)} and
341 * {@link DataSchemaContextTree#getRoot()} instead.
343 @Deprecated(forRemoval = true, since = "8.0.2")
344 public static @NonNull DataSchemaContextNode<?> from(final EffectiveModelContext ctx) {
345 return new ContainerContextNode(ctx);