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;
18 import org.eclipse.jdt.annotation.NonNull;
19 import org.opendaylight.yangtools.yang.common.Empty;
20 import org.opendaylight.yangtools.yang.common.QName;
21 import org.opendaylight.yangtools.yang.common.QNameModule;
22 import org.opendaylight.yangtools.yang.common.YangVersion;
23 import org.opendaylight.yangtools.yang.model.api.GroupingDefinition;
24 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
25 import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
26 import org.opendaylight.yangtools.yang.model.api.meta.DeclarationReference;
27 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
28 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
29 import org.opendaylight.yangtools.yang.model.api.meta.StatementDefinition;
30 import org.opendaylight.yangtools.yang.model.api.stmt.RefineEffectiveStatement;
31 import org.opendaylight.yangtools.yang.model.api.stmt.RefineStatement;
32 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier;
33 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Descendant;
34 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaTreeEffectiveStatement;
35 import org.opendaylight.yangtools.yang.model.api.stmt.UsesEffectiveStatement;
36 import org.opendaylight.yangtools.yang.model.api.stmt.UsesStatement;
37 import org.opendaylight.yangtools.yang.model.ri.stmt.DeclaredStatementDecorators;
38 import org.opendaylight.yangtools.yang.model.ri.stmt.DeclaredStatements;
39 import org.opendaylight.yangtools.yang.parser.api.YangParserConfiguration;
40 import org.opendaylight.yangtools.yang.parser.rfc7950.reactor.YangValidationBundles;
41 import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.EffectiveStmtUtils;
42 import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.refine.RefineEffectiveStatementImpl;
43 import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.refine.RefineTargetNamespace;
44 import org.opendaylight.yangtools.yang.parser.spi.ParserNamespaces;
45 import org.opendaylight.yangtools.yang.parser.spi.meta.AbstractQNameStatementSupport;
46 import org.opendaylight.yangtools.yang.parser.spi.meta.BoundStmtCtx;
47 import org.opendaylight.yangtools.yang.parser.spi.meta.CopyType;
48 import org.opendaylight.yangtools.yang.parser.spi.meta.EffectiveStmtCtx.Current;
49 import org.opendaylight.yangtools.yang.parser.spi.meta.InferenceException;
50 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.InferenceAction;
51 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.InferenceContext;
52 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.Prerequisite;
53 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase;
54 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
55 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext.Mutable;
56 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContextUtils;
57 import org.opendaylight.yangtools.yang.parser.spi.meta.SubstatementValidator;
58 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
59 import org.opendaylight.yangtools.yang.parser.spi.validation.ValidationBundles;
60 import org.opendaylight.yangtools.yang.parser.spi.validation.ValidationBundles.ValidationBundleType;
61 import org.slf4j.Logger;
62 import org.slf4j.LoggerFactory;
64 public final class UsesStatementSupport
65 extends AbstractQNameStatementSupport<UsesStatement, UsesEffectiveStatement> {
66 private static final Logger LOG = LoggerFactory.getLogger(UsesStatementSupport.class);
67 private static final SubstatementValidator SUBSTATEMENT_VALIDATOR =
68 SubstatementValidator.builder(YangStmtMapping.USES)
69 .addAny(YangStmtMapping.AUGMENT)
70 .addOptional(YangStmtMapping.DESCRIPTION)
71 .addAny(YangStmtMapping.IF_FEATURE)
72 .addAny(YangStmtMapping.REFINE)
73 .addOptional(YangStmtMapping.REFERENCE)
74 .addOptional(YangStmtMapping.STATUS)
75 .addOptional(YangStmtMapping.WHEN)
78 public UsesStatementSupport(final YangParserConfiguration config) {
79 super(YangStmtMapping.USES, StatementPolicy.exactReplica(), config, SUBSTATEMENT_VALIDATOR);
83 public QName parseArgumentValue(final StmtContext<?, ?, ?> ctx, final String value) {
84 return StmtContextUtils.parseNodeIdentifier(ctx, value);
88 public void onFullDefinitionDeclared(final Mutable<QName, UsesStatement, UsesEffectiveStatement> usesNode) {
89 super.onFullDefinitionDeclared(usesNode);
91 final var usesAction = usesNode.newInferenceAction(ModelProcessingPhase.EFFECTIVE_MODEL);
92 final var groupingName = usesNode.argument();
94 final var sourceGroupingPre = usesAction.requiresCtx(usesNode, ParserNamespaces.GROUPING, groupingName,
95 ModelProcessingPhase.EFFECTIVE_MODEL);
96 final var targetNodePre = usesAction.mutatesEffectiveCtx(usesNode.getParentContext());
98 usesAction.apply(new InferenceAction() {
101 public void apply(final InferenceContext ctx) {
102 final var targetNodeStmtCtx = targetNodePre.resolve(ctx);
103 final var sourceGrpStmtCtx = sourceGroupingPre.resolve(ctx);
105 copyFromSourceToTarget(sourceGrpStmtCtx, targetNodeStmtCtx, usesNode);
107 // Apply any refine statements
108 for (var subStmtCtx : usesNode.mutableDeclaredSubstatements()) {
109 if (subStmtCtx.producesDeclared(RefineStatement.class) && areFeaturesSupported(subStmtCtx)) {
110 performRefine(subStmtCtx, 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.namespaceItem(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 var refines = new LinkedHashMap<Descendant, SchemaNode>();
168 for (var effectiveStatement : substatements) {
169 if (effectiveStatement instanceof RefineEffectiveStatementImpl refineStmt) {
170 refines.put(refineStmt.argument(), refineStmt.getRefineTargetNode());
173 return ImmutableMap.copyOf(refines);
177 * Copy statements from a grouping to a target node.
179 * @param sourceGrpStmtCtx
180 * source grouping statement context
185 * @throws SourceException
186 * instance of SourceException
188 private static void copyFromSourceToTarget(final StmtContext<?, ?, ?> sourceGrpStmtCtx,
189 final Mutable<?, ?, ?> targetCtx, final Mutable<QName, UsesStatement, UsesEffectiveStatement> usesNode) {
190 final var declared = sourceGrpStmtCtx.declaredSubstatements();
191 final var effective = sourceGrpStmtCtx.effectiveSubstatements();
192 final var buffer = new ArrayList<Mutable<?, ?, ?>>(declared.size() + effective.size());
193 final var newQNameModule = getNewQNameModule(targetCtx, sourceGrpStmtCtx);
194 final var unsupported = !usesNode.isSupportedByFeatures();
196 for (var original : declared) {
197 if (shouldCopy(original)) {
198 original.copyAsChildOf(targetCtx, CopyType.ADDED_BY_USES, newQNameModule).ifPresent(copy -> {
199 if (unsupported || !original.isSupportedByFeatures() || !original.isSupportedToBuildEffective()) {
200 copy.setUnsupported();
207 for (var original : effective) {
208 if (shouldCopy(original)) {
209 original.copyAsChildOf(targetCtx, CopyType.ADDED_BY_USES, newQNameModule).ifPresent(buffer::add);
213 targetCtx.addEffectiveSubstatements(buffer);
214 usesNode.addAsEffectOfStatement(buffer);
217 private static boolean shouldCopy(final StmtContext<?, ?, ?> stmt) {
218 // https://tools.ietf.org/html/rfc7950#section-7.13:
220 // The effect of a "uses" reference to a grouping is that the nodes
221 // defined by the grouping are copied into the current schema tree and
222 // are then updated according to the "refine" and "augment" statements.
224 // This means that the statement that is about to be copied (and can be subjected to buildEffective() I think)
225 // is actually a SchemaTreeEffectiveStatement
226 if (SchemaTreeEffectiveStatement.class.isAssignableFrom(
227 stmt.publicDefinition().getEffectiveRepresentationClass())) {
231 // As per https://tools.ietf.org/html/rfc7950#section-7.13.2:
233 // o Any node can get refined extensions, if the extension allows
234 // refinement. See Section 7.19 for details.
236 // and https://tools.ietf.org/html/rfc7950#section-7.19:
238 // An extension can allow refinement (see Section 7.13.2) and deviations
239 // (Section 7.20.3.2), but the mechanism for how this is defined is
240 // outside the scope of this specification.
242 // This is actively used out there (tailf-common.yang's tailf:action), which is incorrect, though. They do
243 // publish a bunch of metadata (through tailf-meta-extension.yang), but fail to publish a key aspect of the
244 // statement: it attaches to schema tree namespace (just as RFC7950 action does). Such an extension would
245 // automatically result in the extension being picked up by the above check and everybody would live happily
248 // We do not live in that world yet, hence we do the following and keep our fingers crossed.
249 // FIXME: YANGTOOLS-403: this should not be necessary once we implement the above (although tests will complain)
250 return StmtContextUtils.isUnknownStatement(stmt);
253 private static QNameModule getNewQNameModule(final StmtContext<?, ?, ?> targetCtx,
254 final StmtContext<?, ?, ?> stmtContext) {
255 if (targetCtx.getParentContext() == null) {
256 return targetCtx.namespaceItem(ParserNamespaces.MODULECTX_TO_QNAME, targetCtx);
258 if (targetCtx.publicDefinition() == YangStmtMapping.AUGMENT) {
259 return StmtContextUtils.getModuleQName(targetCtx);
261 if (targetCtx.argument() instanceof QName targetQName && stmtContext.argument() instanceof QName) {
262 return targetQName.getModule();
268 private static boolean areFeaturesSupported(final StmtContext<?, ?, ?> subStmtCtx) {
270 * In case of Yang 1.1, checks whether features are supported.
272 return !YangVersion.VERSION_1_1.equals(subStmtCtx.yangVersion()) || subStmtCtx.isSupportedByFeatures();
275 private static void performRefine(final Mutable<?, ?, ?> subStmtCtx, final StmtContext<?, ?, ?> usesParentCtx) {
276 final Object refineArgument = subStmtCtx.argument();
277 if (!(refineArgument instanceof SchemaNodeIdentifier refineTarget)) {
278 throw new InferenceException(subStmtCtx,
279 "Invalid refine argument %s. It must be instance of SchemaNodeIdentifier.", refineArgument);
282 // FIXME: this really should be handled via separate inference, i.e. we first instantiate the template and when
283 // it appears, this refine will trigger on it. This reinforces the FIXME below.
284 final var optRefineTargetCtx = ParserNamespaces.findSchemaTreeStatement(usesParentCtx, refineTarget);
285 InferenceException.throwIf(!optRefineTargetCtx.isPresent(), subStmtCtx, "Refine target node %s not found.",
288 // FIXME: This communicates the looked-up target node to RefineStatementSupport.buildEffective(). We should do
289 // this trick through a shared namespace or similar reactor-agnostic meeting place. It really feels like
290 // an inference action RefineStatementSupport should be doing.
291 final var refineTargetNodeCtx = optRefineTargetCtx.orElseThrow();
292 if (StmtContextUtils.isUnknownStatement(refineTargetNodeCtx)) {
293 LOG.trace("Refine node '{}' in uses '{}' has target node unknown statement '{}'. "
294 + "Refine has been skipped. At line: {}", subStmtCtx.argument(),
295 subStmtCtx.coerceParentContext().argument(), refineTargetNodeCtx.argument(),
296 subStmtCtx.sourceReference());
298 verify(refineTargetNodeCtx instanceof Mutable, "Unexpected target %s", refineTargetNodeCtx);
299 addOrReplaceNodes(subStmtCtx, (Mutable<?, ?, ?>) refineTargetNodeCtx);
302 // Target is a prerequisite for the 'refine', hence if the target is not supported, the refine is not supported
303 // as well. Otherwise add a pointer to the target into refine's local namespace.
304 if (refineTargetNodeCtx.isSupportedToBuildEffective()) {
305 subStmtCtx.addToNs(RefineTargetNamespace.INSTANCE, Empty.value(), refineTargetNodeCtx);
307 subStmtCtx.setUnsupported();
311 private static void addOrReplaceNodes(final StmtContext<?, ?, ?> subStmtCtx,
312 final Mutable<?, ?, ?> refineTargetNodeCtx) {
313 for (StmtContext<?, ?, ?> refineSubstatementCtx : subStmtCtx.declaredSubstatements()) {
314 if (isSupportedRefineSubstatement(refineSubstatementCtx)) {
315 addOrReplaceNode(refineSubstatementCtx, refineTargetNodeCtx);
320 private static void addOrReplaceNode(final StmtContext<?, ?, ?> refineSubstatementCtx,
321 final Mutable<?, ?, ?> refineTargetNodeCtx) {
323 final StatementDefinition refineSubstatementDef = refineSubstatementCtx.publicDefinition();
325 // FIXME: this is quite costly, use an explicit block
326 SourceException.throwIf(!isSupportedRefineTarget(refineSubstatementCtx, refineTargetNodeCtx),
327 refineSubstatementCtx,
328 "Error in module '%s' in the refine of uses '%s': can not perform refine of '%s' for the target '%s'.",
329 refineSubstatementCtx.getRoot().rawArgument(), refineSubstatementCtx.coerceParentContext().argument(),
330 refineSubstatementCtx.publicDefinition(), refineTargetNodeCtx.publicDefinition());
332 if (!isAllowedToAddByRefine(refineSubstatementDef)) {
333 refineTargetNodeCtx.removeStatementFromEffectiveSubstatements(refineSubstatementDef);
335 // FIXME: childCopyOf() should handle this through per-statement copy policy, right?
336 refineTargetNodeCtx.addEffectiveSubstatement(refineSubstatementCtx.replicaAsChildOf(refineTargetNodeCtx));
339 // FIXME: clarify this and inline into single caller
340 private static boolean isAllowedToAddByRefine(final StatementDefinition publicDefinition) {
341 return YangStmtMapping.MUST.equals(publicDefinition);
344 private static boolean isSupportedRefineSubstatement(final StmtContext<?, ?, ?> refineSubstatementCtx) {
345 final Collection<?> supportedRefineSubstatements = refineSubstatementCtx.namespaceItem(
346 ValidationBundles.NAMESPACE, ValidationBundleType.SUPPORTED_REFINE_SUBSTATEMENTS);
348 return supportedRefineSubstatements == null || supportedRefineSubstatements.isEmpty()
349 || supportedRefineSubstatements.contains(refineSubstatementCtx.publicDefinition())
350 || StmtContextUtils.isUnknownStatement(refineSubstatementCtx);
353 private static boolean isSupportedRefineTarget(final StmtContext<?, ?, ?> refineSubstatementCtx,
354 final StmtContext<?, ?, ?> refineTargetNodeCtx) {
355 final Collection<?> supportedRefineTargets = YangValidationBundles.SUPPORTED_REFINE_TARGETS.get(
356 refineSubstatementCtx.publicDefinition());
358 return supportedRefineTargets == null || supportedRefineTargets.isEmpty()
359 || supportedRefineTargets.contains(refineTargetNodeCtx.publicDefinition());