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 java.util.Optional;
19 import org.eclipse.jdt.annotation.NonNull;
20 import org.opendaylight.yangtools.yang.common.Empty;
21 import org.opendaylight.yangtools.yang.common.QName;
22 import org.opendaylight.yangtools.yang.common.QNameModule;
23 import org.opendaylight.yangtools.yang.common.YangVersion;
24 import org.opendaylight.yangtools.yang.model.api.GroupingDefinition;
25 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
26 import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
27 import org.opendaylight.yangtools.yang.model.api.meta.DeclarationReference;
28 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
29 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
30 import org.opendaylight.yangtools.yang.model.api.meta.StatementDefinition;
31 import org.opendaylight.yangtools.yang.model.api.stmt.RefineEffectiveStatement;
32 import org.opendaylight.yangtools.yang.model.api.stmt.RefineStatement;
33 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier;
34 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Descendant;
35 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaTreeEffectiveStatement;
36 import org.opendaylight.yangtools.yang.model.api.stmt.UsesEffectiveStatement;
37 import org.opendaylight.yangtools.yang.model.api.stmt.UsesStatement;
38 import org.opendaylight.yangtools.yang.model.ri.stmt.DeclaredStatementDecorators;
39 import org.opendaylight.yangtools.yang.model.ri.stmt.DeclaredStatements;
40 import org.opendaylight.yangtools.yang.parser.api.YangParserConfiguration;
41 import org.opendaylight.yangtools.yang.parser.rfc7950.reactor.YangValidationBundles;
42 import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.EffectiveStmtUtils;
43 import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.refine.RefineEffectiveStatementImpl;
44 import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.refine.RefineTargetNamespace;
45 import org.opendaylight.yangtools.yang.parser.spi.GroupingNamespace;
46 import org.opendaylight.yangtools.yang.parser.spi.SchemaTreeNamespace;
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.InferenceAction;
53 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.InferenceContext;
54 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.Prerequisite;
55 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase;
56 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
57 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext.Mutable;
58 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContextUtils;
59 import org.opendaylight.yangtools.yang.parser.spi.meta.SubstatementValidator;
60 import org.opendaylight.yangtools.yang.parser.spi.source.ModuleCtxToModuleQName;
61 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
62 import org.opendaylight.yangtools.yang.parser.spi.validation.ValidationBundlesNamespace;
63 import org.opendaylight.yangtools.yang.parser.spi.validation.ValidationBundlesNamespace.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 super.onFullDefinitionDeclared(usesNode);
94 final var usesAction = usesNode.newInferenceAction(ModelProcessingPhase.EFFECTIVE_MODEL);
95 final var groupingName = usesNode.argument();
97 final var sourceGroupingPre = usesAction.requiresCtx(usesNode, GroupingNamespace.class, groupingName,
98 ModelProcessingPhase.EFFECTIVE_MODEL);
99 final var targetNodePre = usesAction.mutatesEffectiveCtx(usesNode.getParentContext());
101 usesAction.apply(new InferenceAction() {
104 public void apply(final InferenceContext ctx) {
105 final var targetNodeStmtCtx = targetNodePre.resolve(ctx);
106 final var sourceGrpStmtCtx = sourceGroupingPre.resolve(ctx);
108 copyFromSourceToTarget(sourceGrpStmtCtx, targetNodeStmtCtx, usesNode);
110 // Apply any refine statements
111 for (var subStmtCtx : usesNode.mutableDeclaredSubstatements()) {
112 if (subStmtCtx.producesDeclared(RefineStatement.class) && areFeaturesSupported(subStmtCtx)) {
113 performRefine(subStmtCtx, targetNodeStmtCtx);
117 StmtContextUtils.validateIfFeatureAndWhenOnListKeys(usesNode);
118 usesNode.addToNs(SourceGroupingNamespace.class, Empty.value(), sourceGrpStmtCtx);
122 public void prerequisiteFailed(final Collection<? extends Prerequisite<?>> failed) {
123 InferenceException.throwIf(failed.contains(sourceGroupingPre), usesNode,
124 "Grouping '%s' was not resolved.", groupingName);
125 throw new InferenceException("Unknown error occurred.", usesNode);
131 protected UsesStatement createDeclared(final BoundStmtCtx<QName> ctx,
132 final ImmutableList<DeclaredStatement<?>> substatements) {
133 return DeclaredStatements.createUses(ctx.getRawArgument(), ctx.getArgument(), substatements);
137 protected UsesStatement attachDeclarationReference(final UsesStatement stmt, final DeclarationReference reference) {
138 return DeclaredStatementDecorators.decorateUses(stmt, reference);
142 protected UsesEffectiveStatement createEffective(final Current<QName, UsesStatement> stmt,
143 final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
144 final EffectiveStatement<?, ?> source =
145 verifyNotNull(stmt.getFromNamespace(SourceGroupingNamespace.class, Empty.value())).buildEffective();
146 verify(source instanceof GroupingDefinition, "Unexpected source %s", source);
147 final GroupingDefinition sourceGrouping = (GroupingDefinition) source;
149 final int flags = EffectiveStmtUtils.historyAndStatusFlags(stmt.history(), substatements);
150 final QName argument = stmt.getArgument();
151 final UsesStatement declared = stmt.declared();
153 if (substatements.isEmpty()) {
154 return argument.equals(declared.argument())
155 ? new EmptyLocalUsesEffectiveStatement(declared, sourceGrouping, flags)
156 : new SimpleCopiedUsesEffectiveStatement(declared, argument, sourceGrouping, flags);
159 if (declared.argument().equals(argument)) {
160 return new RegularLocalUsesEffectiveStatement(declared, sourceGrouping, flags, substatements);
162 if (findFirstStatement(substatements, RefineEffectiveStatement.class) == null) {
163 return new SimpleCopiedUsesEffectiveStatement(declared, argument, sourceGrouping, flags, substatements);
165 return new FullCopiedUsesEffectiveStatement(declared, argument, sourceGrouping, flags, substatements);
168 static @NonNull ImmutableMap<Descendant, SchemaNode> indexRefines(
169 final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
170 final var refines = new LinkedHashMap<Descendant, SchemaNode>();
171 for (var effectiveStatement : substatements) {
172 if (effectiveStatement instanceof RefineEffectiveStatementImpl) {
173 final RefineEffectiveStatementImpl refineStmt = (RefineEffectiveStatementImpl) effectiveStatement;
174 refines.put(refineStmt.argument(), refineStmt.getRefineTargetNode());
177 return ImmutableMap.copyOf(refines);
181 * Copy statements from a grouping to a target node.
183 * @param sourceGrpStmtCtx
184 * source grouping statement context
189 * @throws SourceException
190 * instance of SourceException
192 private static void copyFromSourceToTarget(final StmtContext<?, ?, ?> sourceGrpStmtCtx,
193 final Mutable<?, ?, ?> targetCtx, final Mutable<QName, UsesStatement, UsesEffectiveStatement> usesNode) {
194 final var declared = sourceGrpStmtCtx.declaredSubstatements();
195 final var effective = sourceGrpStmtCtx.effectiveSubstatements();
196 final var buffer = new ArrayList<Mutable<?, ?, ?>>(declared.size() + effective.size());
197 final var newQNameModule = getNewQNameModule(targetCtx, sourceGrpStmtCtx);
198 final var unsupported = !usesNode.isSupportedByFeatures();
200 for (var original : declared) {
201 if (shouldCopy(original)) {
202 original.copyAsChildOf(targetCtx, CopyType.ADDED_BY_USES, newQNameModule).ifPresent(copy -> {
203 if (unsupported || !original.isSupportedByFeatures() || !original.isSupportedToBuildEffective()) {
204 copy.setUnsupported();
211 for (var original : effective) {
212 if (shouldCopy(original)) {
213 original.copyAsChildOf(targetCtx, CopyType.ADDED_BY_USES, newQNameModule).ifPresent(buffer::add);
217 targetCtx.addEffectiveSubstatements(buffer);
218 usesNode.addAsEffectOfStatement(buffer);
221 private static boolean shouldCopy(final StmtContext<?, ?, ?> stmt) {
222 // https://tools.ietf.org/html/rfc7950#section-7.13:
224 // The effect of a "uses" reference to a grouping is that the nodes
225 // defined by the grouping are copied into the current schema tree and
226 // are then updated according to the "refine" and "augment" statements.
228 // This means that the statement that is about to be copied (and can be subjected to buildEffective() I think)
229 // is actually a SchemaTreeEffectiveStatement
230 if (SchemaTreeEffectiveStatement.class.isAssignableFrom(
231 stmt.publicDefinition().getEffectiveRepresentationClass())) {
235 // As per https://tools.ietf.org/html/rfc7950#section-7.13.2:
237 // o Any node can get refined extensions, if the extension allows
238 // refinement. See Section 7.19 for details.
240 // and https://tools.ietf.org/html/rfc7950#section-7.19:
242 // An extension can allow refinement (see Section 7.13.2) and deviations
243 // (Section 7.20.3.2), but the mechanism for how this is defined is
244 // outside the scope of this specification.
246 // This is actively used out there (tailf-common.yang's tailf:action), which is incorrect, though. They do
247 // publish a bunch of metadata (through tailf-meta-extension.yang), but fail to publish a key aspect of the
248 // statement: it attaches to schema tree namespace (just as RFC7950 action does). Such an extension would
249 // automatically result in the extension being picked up by the above check and everybody would live happily
252 // We do not live in that world yet, hence we do the following and keep our fingers crossed.
253 // FIXME: YANGTOOLS-403: this should not be necessary once we implement the above (although tests will complain)
254 return StmtContextUtils.isUnknownStatement(stmt);
257 private static QNameModule getNewQNameModule(final StmtContext<?, ?, ?> targetCtx,
258 final StmtContext<?, ?, ?> stmtContext) {
259 if (targetCtx.getParentContext() == null) {
260 return targetCtx.getFromNamespace(ModuleCtxToModuleQName.class, targetCtx);
262 if (targetCtx.publicDefinition() == YangStmtMapping.AUGMENT) {
263 return StmtContextUtils.getRootModuleQName(targetCtx);
265 final var targetArgument = targetCtx.argument();
266 if (targetArgument instanceof QName && stmtContext.argument() instanceof QName) {
267 return ((QName) targetArgument).getModule();
273 private static boolean areFeaturesSupported(final StmtContext<?, ?, ?> subStmtCtx) {
275 * In case of Yang 1.1, checks whether features are supported.
277 return !YangVersion.VERSION_1_1.equals(subStmtCtx.yangVersion()) || subStmtCtx.isSupportedByFeatures();
280 private static void performRefine(final Mutable<?, ?, ?> subStmtCtx, final StmtContext<?, ?, ?> usesParentCtx) {
281 final Object refineArgument = subStmtCtx.argument();
282 InferenceException.throwIf(!(refineArgument instanceof SchemaNodeIdentifier), subStmtCtx,
283 "Invalid refine argument %s. It must be instance of SchemaNodeIdentifier.", refineArgument);
285 // FIXME: this really should be handled via separate inference, i.e. we first instantiate the template and when
286 // it appears, this refine will trigger on it. This reinforces the FIXME below.
287 final Optional<StmtContext<?, ?, ?>> optRefineTargetCtx = SchemaTreeNamespace.findNode(
288 usesParentCtx, (SchemaNodeIdentifier) refineArgument);
289 InferenceException.throwIf(!optRefineTargetCtx.isPresent(), subStmtCtx, "Refine target node %s not found.",
292 // FIXME: This communicates the looked-up target node to RefineStatementSupport.buildEffective(). We should do
293 // this trick through a shared namespace or similar reactor-agnostic meeting place. It really feels like
294 // an inference action RefineStatementSupport should be doing.
295 final StmtContext<?, ?, ?> refineTargetNodeCtx = optRefineTargetCtx.get();
296 if (StmtContextUtils.isUnknownStatement(refineTargetNodeCtx)) {
297 LOG.trace("Refine node '{}' in uses '{}' has target node unknown statement '{}'. "
298 + "Refine has been skipped. At line: {}", subStmtCtx.argument(),
299 subStmtCtx.coerceParentContext().argument(), refineTargetNodeCtx.argument(),
300 subStmtCtx.sourceReference());
302 verify(refineTargetNodeCtx instanceof Mutable, "Unexpected target %s", refineTargetNodeCtx);
303 addOrReplaceNodes(subStmtCtx, (Mutable<?, ?, ?>) refineTargetNodeCtx);
306 // Target is a prerequisite for the 'refine', hence if the target is not supported, the refine is not supported
307 // as well. Otherwise add a pointer to the target into refine's local namespace.
308 if (refineTargetNodeCtx.isSupportedToBuildEffective()) {
309 subStmtCtx.addToNs(RefineTargetNamespace.class, Empty.value(), refineTargetNodeCtx);
311 subStmtCtx.setUnsupported();
315 private static void addOrReplaceNodes(final StmtContext<?, ?, ?> subStmtCtx,
316 final Mutable<?, ?, ?> refineTargetNodeCtx) {
317 for (StmtContext<?, ?, ?> refineSubstatementCtx : subStmtCtx.declaredSubstatements()) {
318 if (isSupportedRefineSubstatement(refineSubstatementCtx)) {
319 addOrReplaceNode(refineSubstatementCtx, refineTargetNodeCtx);
324 private static void addOrReplaceNode(final StmtContext<?, ?, ?> refineSubstatementCtx,
325 final Mutable<?, ?, ?> refineTargetNodeCtx) {
327 final StatementDefinition refineSubstatementDef = refineSubstatementCtx.publicDefinition();
329 // FIXME: this is quite costly, use an explicit block
330 SourceException.throwIf(!isSupportedRefineTarget(refineSubstatementCtx, refineTargetNodeCtx),
331 refineSubstatementCtx,
332 "Error in module '%s' in the refine of uses '%s': can not perform refine of '%s' for the target '%s'.",
333 refineSubstatementCtx.getRoot().rawArgument(), refineSubstatementCtx.coerceParentContext().argument(),
334 refineSubstatementCtx.publicDefinition(), refineTargetNodeCtx.publicDefinition());
336 if (!isAllowedToAddByRefine(refineSubstatementDef)) {
337 refineTargetNodeCtx.removeStatementFromEffectiveSubstatements(refineSubstatementDef);
339 // FIXME: childCopyOf() should handle this through per-statement copy policy, right?
340 refineTargetNodeCtx.addEffectiveSubstatement(refineSubstatementCtx.replicaAsChildOf(refineTargetNodeCtx));
343 // FIXME: clarify this and inline into single caller
344 private static boolean isAllowedToAddByRefine(final StatementDefinition publicDefinition) {
345 return YangStmtMapping.MUST.equals(publicDefinition);
348 private static boolean isSupportedRefineSubstatement(final StmtContext<?, ?, ?> refineSubstatementCtx) {
349 final Collection<?> supportedRefineSubstatements = refineSubstatementCtx.getFromNamespace(
350 ValidationBundlesNamespace.class, ValidationBundleType.SUPPORTED_REFINE_SUBSTATEMENTS);
352 return supportedRefineSubstatements == null || supportedRefineSubstatements.isEmpty()
353 || supportedRefineSubstatements.contains(refineSubstatementCtx.publicDefinition())
354 || StmtContextUtils.isUnknownStatement(refineSubstatementCtx);
357 private static boolean isSupportedRefineTarget(final StmtContext<?, ?, ?> refineSubstatementCtx,
358 final StmtContext<?, ?, ?> refineTargetNodeCtx) {
359 final Collection<?> supportedRefineTargets = YangValidationBundles.SUPPORTED_REFINE_TARGETS.get(
360 refineSubstatementCtx.publicDefinition());
362 return supportedRefineTargets == null || supportedRefineTargets.isEmpty()
363 || supportedRefineTargets.contains(refineTargetNodeCtx.publicDefinition());