2 * Copyright (c) 2017 Pantheon Technologies, s.r.o. 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.parser.rfc7950.stmt.uses;
10 import static com.google.common.base.Verify.verify;
11 import static com.google.common.base.Verify.verifyNotNull;
13 import com.google.common.collect.ImmutableList;
14 import com.google.common.collect.ImmutableMap;
15 import java.util.ArrayList;
16 import java.util.Collection;
17 import java.util.LinkedHashMap;
19 import java.util.Optional;
20 import org.eclipse.jdt.annotation.NonNull;
21 import org.opendaylight.yangtools.yang.common.Empty;
22 import org.opendaylight.yangtools.yang.common.QName;
23 import org.opendaylight.yangtools.yang.common.QNameModule;
24 import org.opendaylight.yangtools.yang.common.YangVersion;
25 import org.opendaylight.yangtools.yang.model.api.GroupingDefinition;
26 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
27 import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
28 import org.opendaylight.yangtools.yang.model.api.meta.DeclarationReference;
29 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
30 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
31 import org.opendaylight.yangtools.yang.model.api.meta.StatementDefinition;
32 import org.opendaylight.yangtools.yang.model.api.stmt.RefineEffectiveStatement;
33 import org.opendaylight.yangtools.yang.model.api.stmt.RefineStatement;
34 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier;
35 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Descendant;
36 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaTreeEffectiveStatement;
37 import org.opendaylight.yangtools.yang.model.api.stmt.UsesEffectiveStatement;
38 import org.opendaylight.yangtools.yang.model.api.stmt.UsesStatement;
39 import org.opendaylight.yangtools.yang.model.ri.stmt.DeclaredStatementDecorators;
40 import org.opendaylight.yangtools.yang.model.ri.stmt.DeclaredStatements;
41 import org.opendaylight.yangtools.yang.parser.api.YangParserConfiguration;
42 import org.opendaylight.yangtools.yang.parser.rfc7950.reactor.YangValidationBundles;
43 import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.EffectiveStmtUtils;
44 import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.refine.RefineEffectiveStatementImpl;
45 import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.refine.RefineTargetNamespace;
46 import org.opendaylight.yangtools.yang.parser.spi.ParserNamespaces;
47 import org.opendaylight.yangtools.yang.parser.spi.meta.AbstractQNameStatementSupport;
48 import org.opendaylight.yangtools.yang.parser.spi.meta.BoundStmtCtx;
49 import org.opendaylight.yangtools.yang.parser.spi.meta.CopyType;
50 import org.opendaylight.yangtools.yang.parser.spi.meta.EffectiveStmtCtx.Current;
51 import org.opendaylight.yangtools.yang.parser.spi.meta.InferenceException;
52 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder;
53 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.InferenceAction;
54 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.InferenceContext;
55 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.Prerequisite;
56 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase;
57 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
58 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext.Mutable;
59 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContextUtils;
60 import org.opendaylight.yangtools.yang.parser.spi.meta.SubstatementValidator;
61 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
62 import org.opendaylight.yangtools.yang.parser.spi.validation.ValidationBundles;
63 import org.opendaylight.yangtools.yang.parser.spi.validation.ValidationBundles.ValidationBundleType;
64 import org.slf4j.Logger;
65 import org.slf4j.LoggerFactory;
67 public final class UsesStatementSupport
68 extends AbstractQNameStatementSupport<UsesStatement, UsesEffectiveStatement> {
69 private static final Logger LOG = LoggerFactory.getLogger(UsesStatementSupport.class);
70 private static final SubstatementValidator SUBSTATEMENT_VALIDATOR =
71 SubstatementValidator.builder(YangStmtMapping.USES)
72 .addAny(YangStmtMapping.AUGMENT)
73 .addOptional(YangStmtMapping.DESCRIPTION)
74 .addAny(YangStmtMapping.IF_FEATURE)
75 .addAny(YangStmtMapping.REFINE)
76 .addOptional(YangStmtMapping.REFERENCE)
77 .addOptional(YangStmtMapping.STATUS)
78 .addOptional(YangStmtMapping.WHEN)
81 public UsesStatementSupport(final YangParserConfiguration config) {
82 super(YangStmtMapping.USES, StatementPolicy.exactReplica(), config, SUBSTATEMENT_VALIDATOR);
86 public QName parseArgumentValue(final StmtContext<?, ?, ?> ctx, final String value) {
87 return StmtContextUtils.parseNodeIdentifier(ctx, value);
91 public void onFullDefinitionDeclared(final Mutable<QName, UsesStatement, UsesEffectiveStatement> usesNode) {
92 if (!usesNode.isSupportedByFeatures()) {
95 super.onFullDefinitionDeclared(usesNode);
97 final ModelActionBuilder usesAction = usesNode.newInferenceAction(ModelProcessingPhase.EFFECTIVE_MODEL);
98 final QName groupingName = usesNode.argument();
100 final var sourceGroupingPre = usesAction.requiresCtx(usesNode, ParserNamespaces.GROUPING, groupingName,
101 ModelProcessingPhase.EFFECTIVE_MODEL);
102 final Prerequisite<? extends Mutable<?, ?, ?>> targetNodePre = usesAction.mutatesEffectiveCtx(
103 usesNode.getParentContext());
105 usesAction.apply(new InferenceAction() {
108 public void apply(final InferenceContext ctx) {
109 final Mutable<?, ?, ?> targetNodeStmtCtx = targetNodePre.resolve(ctx);
110 final StmtContext<?, ?, ?> sourceGrpStmtCtx = sourceGroupingPre.resolve(ctx);
112 copyFromSourceToTarget(sourceGrpStmtCtx, targetNodeStmtCtx, usesNode);
113 resolveUsesNode(usesNode, targetNodeStmtCtx);
114 StmtContextUtils.validateIfFeatureAndWhenOnListKeys(usesNode);
115 usesNode.addToNs(SourceGroupingNamespace.INSTANCE, Empty.value(), sourceGrpStmtCtx);
119 public void prerequisiteFailed(final Collection<? extends Prerequisite<?>> failed) {
120 InferenceException.throwIf(failed.contains(sourceGroupingPre), usesNode,
121 "Grouping '%s' was not resolved.", groupingName);
122 throw new InferenceException("Unknown error occurred.", usesNode);
128 protected UsesStatement createDeclared(final BoundStmtCtx<QName> ctx,
129 final ImmutableList<DeclaredStatement<?>> substatements) {
130 return DeclaredStatements.createUses(ctx.getRawArgument(), ctx.getArgument(), substatements);
134 protected UsesStatement attachDeclarationReference(final UsesStatement stmt, final DeclarationReference reference) {
135 return DeclaredStatementDecorators.decorateUses(stmt, reference);
139 protected UsesEffectiveStatement createEffective(final Current<QName, UsesStatement> stmt,
140 final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
141 final EffectiveStatement<?, ?> source =
142 verifyNotNull(stmt.getFromNamespace(SourceGroupingNamespace.INSTANCE, Empty.value())).buildEffective();
143 verify(source instanceof GroupingDefinition, "Unexpected source %s", source);
144 final GroupingDefinition sourceGrouping = (GroupingDefinition) source;
146 final int flags = EffectiveStmtUtils.historyAndStatusFlags(stmt.history(), substatements);
147 final QName argument = stmt.getArgument();
148 final UsesStatement declared = stmt.declared();
150 if (substatements.isEmpty()) {
151 return argument.equals(declared.argument())
152 ? new EmptyLocalUsesEffectiveStatement(declared, sourceGrouping, flags)
153 : new SimpleCopiedUsesEffectiveStatement(declared, argument, sourceGrouping, flags);
156 if (declared.argument().equals(argument)) {
157 return new RegularLocalUsesEffectiveStatement(declared, sourceGrouping, flags, substatements);
159 if (findFirstStatement(substatements, RefineEffectiveStatement.class) == null) {
160 return new SimpleCopiedUsesEffectiveStatement(declared, argument, sourceGrouping, flags, substatements);
162 return new FullCopiedUsesEffectiveStatement(declared, argument, sourceGrouping, flags, substatements);
165 static @NonNull ImmutableMap<Descendant, SchemaNode> indexRefines(
166 final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
167 final Map<Descendant, SchemaNode> refines = new LinkedHashMap<>();
169 for (EffectiveStatement<?, ?> effectiveStatement : substatements) {
170 if (effectiveStatement instanceof RefineEffectiveStatementImpl refineStmt) {
171 refines.put(refineStmt.argument(), refineStmt.getRefineTargetNode());
175 return ImmutableMap.copyOf(refines);
179 * Copy statements from a grouping to a target node.
181 * @param sourceGrpStmtCtx
182 * source grouping statement context
187 * @throws SourceException
188 * instance of SourceException
190 private static void copyFromSourceToTarget(final StmtContext<?, ?, ?> sourceGrpStmtCtx,
191 final Mutable<?, ?, ?> targetCtx, final Mutable<QName, UsesStatement, UsesEffectiveStatement> usesNode) {
192 final var declared = sourceGrpStmtCtx.declaredSubstatements();
193 final var effective = sourceGrpStmtCtx.effectiveSubstatements();
194 final var buffer = new ArrayList<Mutable<?, ?, ?>>(declared.size() + effective.size());
195 final QNameModule newQNameModule = getNewQNameModule(targetCtx, sourceGrpStmtCtx);
197 for (StmtContext<?, ?, ?> original : declared) {
198 if (shouldCopy(original)) {
199 original.copyAsChildOf(targetCtx, CopyType.ADDED_BY_USES, newQNameModule).ifPresent(copy -> {
200 if (!original.isSupportedByFeatures() || !original.isSupportedToBuildEffective()) {
201 copy.setUnsupported();
208 for (StmtContext<?, ?, ?> original : effective) {
209 if (shouldCopy(original)) {
210 original.copyAsChildOf(targetCtx, CopyType.ADDED_BY_USES, newQNameModule).ifPresent(buffer::add);
214 targetCtx.addEffectiveSubstatements(buffer);
215 usesNode.addAsEffectOfStatement(buffer);
218 private static boolean shouldCopy(final StmtContext<?, ?, ?> stmt) {
219 // https://tools.ietf.org/html/rfc7950#section-7.13:
221 // The effect of a "uses" reference to a grouping is that the nodes
222 // defined by the grouping are copied into the current schema tree and
223 // are then updated according to the "refine" and "augment" statements.
225 // This means that the statement that is about to be copied (and can be subjected to buildEffective() I think)
226 // is actually a SchemaTreeEffectiveStatement
227 if (SchemaTreeEffectiveStatement.class.isAssignableFrom(
228 stmt.publicDefinition().getEffectiveRepresentationClass())) {
232 // As per https://tools.ietf.org/html/rfc7950#section-7.13.2:
234 // o Any node can get refined extensions, if the extension allows
235 // refinement. See Section 7.19 for details.
237 // and https://tools.ietf.org/html/rfc7950#section-7.19:
239 // An extension can allow refinement (see Section 7.13.2) and deviations
240 // (Section 7.20.3.2), but the mechanism for how this is defined is
241 // outside the scope of this specification.
243 // This is actively used out there (tailf-common.yang's tailf:action), which is incorrect, though. They do
244 // publish a bunch of metadata (through tailf-meta-extension.yang), but fail to publish a key aspect of the
245 // statement: it attaches to schema tree namespace (just as RFC7950 action does). Such an extension would
246 // automatically result in the extension being picked up by the above check and everybody would live happily
249 // We do not live in that world yet, hence we do the following and keep our fingers crossed.
250 // FIXME: YANGTOOLS-403: this should not be necessary once we implement the above (although tests will complain)
251 return StmtContextUtils.isUnknownStatement(stmt);
254 private static QNameModule getNewQNameModule(final StmtContext<?, ?, ?> targetCtx,
255 final StmtContext<?, ?, ?> stmtContext) {
256 if (targetCtx.getParentContext() == null) {
257 return targetCtx.getFromNamespace(ParserNamespaces.MODULECTX_TO_QNAME, targetCtx);
259 if (targetCtx.publicDefinition() == YangStmtMapping.AUGMENT) {
260 return StmtContextUtils.getRootModuleQName(targetCtx);
263 final Object targetStmtArgument = targetCtx.argument();
264 final Object sourceStmtArgument = stmtContext.argument();
265 if (targetStmtArgument instanceof QName && sourceStmtArgument instanceof QName) {
266 return ((QName) targetStmtArgument).getModule();
272 private static void resolveUsesNode(final Mutable<QName, UsesStatement, UsesEffectiveStatement> usesNode,
273 final StmtContext<?, ?, ?> targetNodeStmtCtx) {
274 for (Mutable<?, ?, ?> subStmtCtx : usesNode.mutableDeclaredSubstatements()) {
275 if (subStmtCtx.producesDeclared(RefineStatement.class) && areFeaturesSupported(subStmtCtx)) {
276 performRefine(subStmtCtx, targetNodeStmtCtx);
281 private static boolean areFeaturesSupported(final StmtContext<?, ?, ?> subStmtCtx) {
283 * In case of Yang 1.1, checks whether features are supported.
285 return !YangVersion.VERSION_1_1.equals(subStmtCtx.yangVersion()) || subStmtCtx.isSupportedByFeatures();
288 private static void performRefine(final Mutable<?, ?, ?> subStmtCtx, final StmtContext<?, ?, ?> usesParentCtx) {
289 final Object refineArgument = subStmtCtx.argument();
290 InferenceException.throwIf(!(refineArgument instanceof SchemaNodeIdentifier), subStmtCtx,
291 "Invalid refine argument %s. It must be instance of SchemaNodeIdentifier.", refineArgument);
293 // FIXME: this really should be handled via separate inference, i.e. we first instantiate the template and when
294 // it appears, this refine will trigger on it. This reinforces the FIXME below.
295 final Optional<StmtContext<?, ?, ?>> optRefineTargetCtx = ParserNamespaces.findSchemaTreeStatement(
296 usesParentCtx, (SchemaNodeIdentifier) refineArgument);
297 InferenceException.throwIf(!optRefineTargetCtx.isPresent(), subStmtCtx, "Refine target node %s not found.",
300 // FIXME: This communicates the looked-up target node to RefineStatementSupport.buildEffective(). We should do
301 // this trick through a shared namespace or similar reactor-agnostic meeting place. It really feels like
302 // an inference action RefineStatementSupport should be doing.
303 final StmtContext<?, ?, ?> refineTargetNodeCtx = optRefineTargetCtx.get();
304 if (StmtContextUtils.isUnknownStatement(refineTargetNodeCtx)) {
305 LOG.trace("Refine node '{}' in uses '{}' has target node unknown statement '{}'. "
306 + "Refine has been skipped. At line: {}", subStmtCtx.argument(),
307 subStmtCtx.coerceParentContext().argument(), refineTargetNodeCtx.argument(),
308 subStmtCtx.sourceReference());
310 verify(refineTargetNodeCtx instanceof Mutable, "Unexpected target %s", refineTargetNodeCtx);
311 addOrReplaceNodes(subStmtCtx, (Mutable<?, ?, ?>) refineTargetNodeCtx);
314 // Target is a prerequisite for the 'refine', hence if the target is not supported, the refine is not supported
315 // as well. Otherwise add a pointer to the target into refine's local namespace.
316 if (refineTargetNodeCtx.isSupportedToBuildEffective()) {
317 subStmtCtx.addToNs(RefineTargetNamespace.INSTANCE, Empty.value(), refineTargetNodeCtx);
319 subStmtCtx.setUnsupported();
323 private static void addOrReplaceNodes(final StmtContext<?, ?, ?> subStmtCtx,
324 final Mutable<?, ?, ?> refineTargetNodeCtx) {
325 for (StmtContext<?, ?, ?> refineSubstatementCtx : subStmtCtx.declaredSubstatements()) {
326 if (isSupportedRefineSubstatement(refineSubstatementCtx)) {
327 addOrReplaceNode(refineSubstatementCtx, refineTargetNodeCtx);
332 private static void addOrReplaceNode(final StmtContext<?, ?, ?> refineSubstatementCtx,
333 final Mutable<?, ?, ?> refineTargetNodeCtx) {
335 final StatementDefinition refineSubstatementDef = refineSubstatementCtx.publicDefinition();
337 // FIXME: this is quite costly, use an explicit block
338 SourceException.throwIf(!isSupportedRefineTarget(refineSubstatementCtx, refineTargetNodeCtx),
339 refineSubstatementCtx,
340 "Error in module '%s' in the refine of uses '%s': can not perform refine of '%s' for the target '%s'.",
341 refineSubstatementCtx.getRoot().rawArgument(), refineSubstatementCtx.coerceParentContext().argument(),
342 refineSubstatementCtx.publicDefinition(), refineTargetNodeCtx.publicDefinition());
344 if (!isAllowedToAddByRefine(refineSubstatementDef)) {
345 refineTargetNodeCtx.removeStatementFromEffectiveSubstatements(refineSubstatementDef);
347 // FIXME: childCopyOf() should handle this through per-statement copy policy, right?
348 refineTargetNodeCtx.addEffectiveSubstatement(refineSubstatementCtx.replicaAsChildOf(refineTargetNodeCtx));
351 // FIXME: clarify this and inline into single caller
352 private static boolean isAllowedToAddByRefine(final StatementDefinition publicDefinition) {
353 return YangStmtMapping.MUST.equals(publicDefinition);
356 private static boolean isSupportedRefineSubstatement(final StmtContext<?, ?, ?> refineSubstatementCtx) {
357 final Collection<?> supportedRefineSubstatements = refineSubstatementCtx.getFromNamespace(
358 ValidationBundles.NAMESPACE, ValidationBundleType.SUPPORTED_REFINE_SUBSTATEMENTS);
360 return supportedRefineSubstatements == null || supportedRefineSubstatements.isEmpty()
361 || supportedRefineSubstatements.contains(refineSubstatementCtx.publicDefinition())
362 || StmtContextUtils.isUnknownStatement(refineSubstatementCtx);
365 private static boolean isSupportedRefineTarget(final StmtContext<?, ?, ?> refineSubstatementCtx,
366 final StmtContext<?, ?, ?> refineTargetNodeCtx) {
367 final Collection<?> supportedRefineTargets = YangValidationBundles.SUPPORTED_REFINE_TARGETS.get(
368 refineSubstatementCtx.publicDefinition());
370 return supportedRefineTargets == null || supportedRefineTargets.isEmpty()
371 || supportedRefineTargets.contains(refineTargetNodeCtx.publicDefinition());