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.meta;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.base.CharMatcher;
13 import com.google.common.base.Splitter;
14 import com.google.common.collect.ImmutableBiMap;
15 import com.google.common.collect.ImmutableList;
16 import com.google.common.collect.ImmutableSet;
17 import com.google.common.collect.Lists;
18 import com.google.common.collect.Maps;
19 import java.util.Collection;
20 import java.util.HashSet;
22 import java.util.Objects;
24 import java.util.regex.Pattern;
25 import java.util.stream.Stream;
26 import org.opendaylight.yangtools.yang.common.QName;
27 import org.opendaylight.yangtools.yang.common.QNameModule;
28 import org.opendaylight.yangtools.yang.model.api.YangStmtMapping;
29 import org.opendaylight.yangtools.yang.model.api.meta.DeclarationReference;
30 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
31 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
32 import org.opendaylight.yangtools.yang.model.api.stmt.LeafEffectiveStatement;
33 import org.opendaylight.yangtools.yang.model.api.stmt.ListEffectiveStatement;
34 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Absolute;
35 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Descendant;
36 import org.opendaylight.yangtools.yang.model.api.stmt.UniqueEffectiveStatement;
37 import org.opendaylight.yangtools.yang.model.api.stmt.UniqueStatement;
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.model.ri.stmt.EffectiveStatements;
41 import org.opendaylight.yangtools.yang.parser.api.YangParserConfiguration;
42 import org.opendaylight.yangtools.yang.parser.rfc7950.stmt.ArgumentUtils;
43 import org.opendaylight.yangtools.yang.parser.spi.ParserNamespaces;
44 import org.opendaylight.yangtools.yang.parser.spi.meta.AbstractStatementSupport;
45 import org.opendaylight.yangtools.yang.parser.spi.meta.BoundStmtCtx;
46 import org.opendaylight.yangtools.yang.parser.spi.meta.EffectiveStmtCtx.Current;
47 import org.opendaylight.yangtools.yang.parser.spi.meta.InferenceException;
48 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.InferenceAction;
49 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.InferenceContext;
50 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelActionBuilder.Prerequisite;
51 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase;
52 import org.opendaylight.yangtools.yang.parser.spi.meta.ParserNamespace;
53 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
54 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext.Mutable;
55 import org.opendaylight.yangtools.yang.parser.spi.meta.SubstatementValidator;
56 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
58 public final class UniqueStatementSupport
59 extends AbstractStatementSupport<Set<Descendant>, UniqueStatement, UniqueEffectiveStatement> {
61 * Support 'sep' ABNF rule in RFC7950 section 14. CRLF pattern is used to squash line-break from CRLF to LF form
62 * and then we use SEP_SPLITTER, which can operate on single characters.
64 private static final Pattern CRLF_PATTERN = Pattern.compile("\r\n", Pattern.LITERAL);
65 private static final Splitter SEP_SPLITTER = Splitter.on(CharMatcher.anyOf(" \t\n").precomputed())
68 private static final SubstatementValidator SUBSTATEMENT_VALIDATOR =
69 SubstatementValidator.builder(YangStmtMapping.UNIQUE).build();
71 public UniqueStatementSupport(final YangParserConfiguration config) {
72 super(YangStmtMapping.UNIQUE,
73 StatementPolicy.copyDeclared(
74 (copy, current, substatements) -> copy.getArgument().equals(current.getArgument())),
75 config, SUBSTATEMENT_VALIDATOR);
79 public Set<Descendant> adaptArgumentValue(
80 final StmtContext<Set<Descendant>, UniqueStatement, UniqueEffectiveStatement> ctx,
81 final QNameModule targetModule) {
82 // Copy operation to a targetNamespace -- this implies rehosting node-identifiers to target namespace. Check
83 // if that is needed first, though, so as not to copy things unnecessarily.
84 final var origArg = ctx.getArgument();
85 if (allMatch(origArg.stream().flatMap(desc -> desc.getNodeIdentifiers().stream()), targetModule)) {
89 return origArg.stream()
91 final var nodeIds = descendant.getNodeIdentifiers();
92 // Only update descendants that need updating
93 return allMatch(nodeIds.stream(), targetModule) ? descendant
94 : Descendant.of(Lists.transform(nodeIds, nodeId -> nodeId.bindTo(targetModule).intern()));
96 .collect(ImmutableSet.toImmutableSet());
100 public ImmutableSet<Descendant> parseArgumentValue(final StmtContext<?, ?, ?> ctx, final String value) {
101 final var uniqueConstraints = parseUniqueConstraintArgument(ctx, value);
102 SourceException.throwIf(uniqueConstraints.isEmpty(), ctx,
103 "Invalid argument value '%s' of unique statement. The value must contains at least one descendant schema "
104 + "node identifier.", value);
105 return uniqueConstraints;
109 public void onStatementAdded(final Mutable<Set<Descendant>, UniqueStatement, UniqueEffectiveStatement> stmt) {
110 // Check whether this statement is in a list statement and if so ...
111 final var list = stmt.coerceParentContext();
112 if (list.producesEffective(ListEffectiveStatement.class)) {
113 final var listParent = list.coerceParentContext();
114 // ... do not allow parent to complete until we have resolved ...
115 final var action = listParent.newInferenceAction(ModelProcessingPhase.EFFECTIVE_MODEL);
116 // ... we require the list to be completely resolve ...
117 action.requiresCtx(list, ModelProcessingPhase.EFFECTIVE_MODEL);
118 // ... after which we will continue
119 action.apply(new RequireEffectiveList(stmt, list, listParent));
124 protected UniqueStatement createDeclared(final BoundStmtCtx<Set<Descendant>> ctx,
125 final ImmutableList<DeclaredStatement<?>> substatements) {
126 return DeclaredStatements.createUnique(ctx.getRawArgument(), ctx.getArgument(), substatements);
130 protected UniqueStatement attachDeclarationReference(final UniqueStatement stmt,
131 final DeclarationReference reference) {
132 return DeclaredStatementDecorators.decorateUnique(stmt, reference);
136 protected UniqueEffectiveStatement createEffective(final Current<Set<Descendant>, UniqueStatement> stmt,
137 final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
138 return EffectiveStatements.createUnique(stmt.declared(), substatements);
141 private static boolean allMatch(final Stream<QName> qnames, final QNameModule module) {
142 return qnames.allMatch(qname -> module.equals(qname.getModule()));
145 private static ImmutableSet<Descendant> parseUniqueConstraintArgument(final StmtContext<?, ?, ?> ctx,
146 final String argumentValue) {
147 // deal with 'line-break' rule, which is either "\n" or "\r\n", but not "\r"
148 final String nocrlf = CRLF_PATTERN.matcher(argumentValue).replaceAll("\n");
150 final var uniqueConstraintNodes = new HashSet<Descendant>();
151 for (var uniqueArgToken : SEP_SPLITTER.split(nocrlf)) {
152 final var nodeIdentifier = ArgumentUtils.nodeIdentifierFromPath(ctx, uniqueArgToken);
153 SourceException.throwIf(nodeIdentifier instanceof Absolute, ctx,
154 "Unique statement argument '%s' contains schema node identifier '%s' which is not in the descendant "
155 + "node identifier form.", argumentValue, uniqueArgToken);
156 uniqueConstraintNodes.add((Descendant) nodeIdentifier);
158 return ImmutableSet.copyOf(uniqueConstraintNodes);
162 * Inference action to process parent list reaching effective model, i.e. we can tell it is now complete.
164 private static final class RequireEffectiveList implements InferenceAction {
165 private final StmtContext<Set<Descendant>, ?, ?> unique;
166 private final StmtContext<?, ?, ?> list;
167 private final Mutable<?, ?, ?> parent;
169 RequireEffectiveList(final StmtContext<Set<Descendant>, ?, ?> unique, final StmtContext<?, ?, ?> list,
170 final Mutable<?, ?, ?> parent) {
171 this.unique = requireNonNull(unique);
172 this.list = requireNonNull(list);
173 this.parent = requireNonNull(parent);
177 public void apply(final InferenceContext ctx) {
178 if (isApplicable()) {
179 // So now, we have the effective list, we again block its parent from resolving ...
180 final var action = parent.newInferenceAction(ModelProcessingPhase.EFFECTIVE_MODEL);
181 // ... and before going further ...
182 action.apply(new RequireLeafDescendants(unique,
183 // ... require that each schema node identifier resolves against the schema tree
184 Maps.uniqueIndex(unique.getArgument(),
185 desc -> action.requiresCtxPath(list,
186 // FIXME: why do we need this cast?
187 (ParserNamespace) ParserNamespaces.schemaTree(), desc.getNodeIdentifiers(),
188 ModelProcessingPhase.EFFECTIVE_MODEL))));
193 public void prerequisiteFailed(final Collection<? extends Prerequisite<?>> failed) {
194 InferenceException.throwIf(isApplicable(), unique, "Parent list failed to reach effective model");
197 private boolean isApplicable() {
198 return list.isSupportedToBuildEffective() && unique.isSupportedToBuildEffective();
202 private static final class RequireLeafDescendants implements InferenceAction {
203 private final Map<Prerequisite<StmtContext<?, ?, ?>>, Descendant> prereqs;
204 private final StmtContext<Set<Descendant>, ?, ?> unique;
206 RequireLeafDescendants(final StmtContext<Set<Descendant>, ?, ?> unique,
207 final Map<Prerequisite<StmtContext<?, ?, ?>>, Descendant> prereqs) {
208 this.unique = requireNonNull(unique);
209 this.prereqs = requireNonNull(prereqs);
214 public void apply(final InferenceContext ctx) {
215 // All prerequisites have resolved, so now check each ...
216 for (var entry : prereqs.entrySet()) {
217 final var stmt = entry.getKey().resolve(ctx);
218 // ... and if it is not a leaf, report an error
219 SourceException.throwIf(!stmt.producesEffective(LeafEffectiveStatement.class),
220 unique, "Path %s resolved to non-leaf %s", stmt.publicDefinition().getStatementName());
225 public void prerequisiteFailed(final Collection<? extends Prerequisite<?>> failed) {
226 // Report failed descandants
227 final var inv = ImmutableBiMap.copyOf(prereqs);
228 throw new SourceException(unique,
229 "Following components of unique statement argument refer to non-existent nodes: %s",
230 failed.stream().map(inv::get).filter(Objects::nonNull).collect(ImmutableSet.toImmutableSet()));