2 * Copyright (c) 2020 PANTHEON.tech, 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.stmt.reactor;
10 import static com.google.common.base.Preconditions.checkState;
11 import static com.google.common.base.Verify.verify;
12 import static com.google.common.base.Verify.verifyNotNull;
14 import java.util.Collection;
15 import java.util.stream.Stream;
16 import org.eclipse.jdt.annotation.NonNull;
17 import org.eclipse.jdt.annotation.Nullable;
18 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
19 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
20 import org.opendaylight.yangtools.yang.model.api.meta.StatementDefinition;
21 import org.opendaylight.yangtools.yang.parser.spi.meta.ModelProcessingPhase;
22 import org.opendaylight.yangtools.yang.parser.spi.meta.StatementFactory;
23 import org.opendaylight.yangtools.yang.parser.spi.meta.StatementSupport;
24 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
25 import org.opendaylight.yangtools.yang.parser.spi.source.StatementSourceReference;
26 import org.opendaylight.yangtools.yang.parser.spi.source.StatementWriter.ResumedStatement;
29 * Intermediate subclass of StatementContextBase facing the parser stream via implementation of ResumedStatement. This
30 * shields inference-type substatements from these details.
32 * @param <A> Argument type
33 * @param <D> Declared Statement representation
34 * @param <E> Effective Statement representation
36 abstract class AbstractResumedStatement<A, D extends DeclaredStatement<A>, E extends EffectiveStatement<A, D>>
37 extends OriginalStmtCtx<A, D, E> implements ResumedStatement {
38 private final String rawArgument;
40 private StatementMap substatements = StatementMap.empty();
41 private @Nullable D declaredInstance;
44 AbstractResumedStatement(final AbstractResumedStatement<A, D, E> original) {
46 this.rawArgument = original.rawArgument;
47 this.substatements = original.substatements;
48 this.declaredInstance = original.declaredInstance;
51 AbstractResumedStatement(final StatementDefinitionContext<A, D, E> def, final StatementSourceReference ref,
52 final String rawArgument) {
54 this.rawArgument = def.support().internArgument(rawArgument);
58 public final String rawArgument() {
63 public Collection<? extends StatementContextBase<?, ?, ?>> mutableDeclaredSubstatements() {
64 return verifyNotNull(substatements);
68 public final D declared() {
70 return (existing = declaredInstance) != null ? existing : loadDeclared();
73 private @NonNull D loadDeclared() {
74 final ModelProcessingPhase phase = getCompletedPhase();
75 checkState(phase == ModelProcessingPhase.FULL_DECLARATION || phase == ModelProcessingPhase.EFFECTIVE_MODEL,
76 "Cannot build declared instance after phase %s", phase);
77 return declaredInstance = definition().getFactory().createDeclared(this, substatementsAsDeclared());
80 @SuppressWarnings({ "rawtypes", "unchecked" })
81 private @NonNull Stream<DeclaredStatement<?>> substatementsAsDeclared() {
82 final Stream<AbstractResumedStatement<?, ?, ?>> stream;
83 if (getImplicitDeclaredFlag()) {
84 stream = substatements.stream().map(AbstractResumedStatement::unmaskUndeclared);
86 stream = (Stream) substatements.stream();
89 return stream.map(AbstractResumedStatement::declared);
93 public final StatementDefinition getDefinition() {
94 return publicDefinition();
98 public final StatementSourceReference getSourceReference() {
99 return sourceReference();
103 public final boolean isFullyDefined() {
104 return fullyDefined();
108 final E createEffective(final StatementFactory<A, D, E> factory) {
109 return createEffective(factory, this, streamDeclared(), streamEffective());
112 // Creates EffectiveStatement through full materialization and assumes declared statement presence
113 private @NonNull E createEffective(final StatementFactory<A, D, E> factory,
114 final StatementContextBase<A, D, E> ctx, final Stream<? extends StmtContext<?, ?, ?>> declared,
115 final Stream<? extends StmtContext<?, ?, ?>> effective) {
116 // Statement reference count infrastructure makes an assumption that effective statement is only built after
117 // the declared statement is already done. Statements tracked by this class always have a declared view, and
118 // we need to ensure that is built before we touch effective substatements.
120 // Once the effective substatement stream has been exhausted, reference counting will triggers a sweep, hence
121 // the substatements may be gone by the time the factory attempts to acquire the declared statement.
124 return factory.createEffective(ctx, declared, effective);
128 final E createInferredEffective(final StatementFactory<A, D, E> factory,
129 final InferredStatementContext<A, D, E> ctx, final Stream<? extends StmtContext<?, ?, ?>> declared,
130 final Stream<? extends StmtContext<?, ?, ?>> effective) {
131 return createEffective(factory, ctx, declared, effective);
135 * Create a new substatement at the specified offset.
137 * @param offset Substatement offset
138 * @param def definition context
139 * @param ref source reference
140 * @param argument statement argument
141 * @param <X> new substatement argument type
142 * @param <Y> new substatement declared type
143 * @param <Z> new substatement effective type
144 * @return A new substatement
146 @SuppressWarnings("checkstyle:methodTypeParameterName")
147 final <X, Y extends DeclaredStatement<X>, Z extends EffectiveStatement<X, Y>>
148 AbstractResumedStatement<X, Y, Z> createSubstatement(final int offset,
149 final StatementDefinitionContext<X, Y, Z> def, final StatementSourceReference ref,
150 final String argument) {
151 final ModelProcessingPhase inProgressPhase = getRoot().getSourceContext().getInProgressPhase();
152 checkState(inProgressPhase != ModelProcessingPhase.EFFECTIVE_MODEL,
153 "Declared statement cannot be added in effective phase at: %s", sourceReference());
155 final SubstatementContext<X, Y, Z> ret;
156 final var implicitParent = definition().getImplicitParentFor(this, def.getPublicView());
157 if (implicitParent.isPresent()) {
158 setImplicitDeclaredFlag();
159 final var parent = createUndeclared(offset, implicitParent.orElseThrow(), ref, argument);
160 ret = new SubstatementContext<>(parent, def, ref, argument);
161 parent.addEffectiveSubstatement(ret);
163 ret = new SubstatementContext<>(this, def, ref, argument);
164 substatements = substatements.put(offset, ret);
167 def.onStatementAdded(ret);
171 private <X, Y extends DeclaredStatement<X>, Z extends EffectiveStatement<X, Y>>
172 UndeclaredStmtCtx<X, Y, Z> createUndeclared(final int offset, final StatementSupport<X, Y, Z> support,
173 final StatementSourceReference ref, final String argument) {
174 final UndeclaredStmtCtx<X, Y, Z> ret;
175 final var implicitParent = definition().getImplicitParentFor(this, support.getPublicView());
176 if (implicitParent.isPresent()) {
177 final var parent = createUndeclared(offset, implicitParent.orElseThrow(), ref, argument);
178 ret = new UndeclaredStmtCtx<>(parent, support, argument);
179 parent.addEffectiveSubstatement(ret);
181 ret = new UndeclaredStmtCtx<>(this, support, argument);
182 substatements = substatements.put(offset, ret);
184 support.onStatementAdded(ret);
189 final Stream<? extends @NonNull StmtContext<?, ?, ?>> streamDeclared() {
190 return substatements.stream().filter(StmtContext::isSupportedToBuildEffective);
194 final void dropDeclaredSubstatements() {
195 substatements = null;
199 * Attempt to lookup a declared substatement by its offset in this statement, passing through any implicit
200 * statements which have been created to encapsulate it.
202 * @param offset Substatement offset
203 * @return Substatement, or null if substatement does not exist.
205 final @Nullable AbstractResumedStatement<?, ?, ?> enterSubstatement(final int offset) {
206 final var stmt = substatements.get(offset);
207 return stmt == null ? null : unmaskUndeclared(stmt);
210 private static @NonNull AbstractResumedStatement<?, ?, ?> unmaskUndeclared(final ReactorStmtCtx<?, ?, ?> stmt) {
212 while (!(ret instanceof AbstractResumedStatement)) {
213 verify(ret instanceof UndeclaredStmtCtx, "Unexpectred statement %s", ret);
214 ret = ((UndeclaredStmtCtx<?, ?, ?>) ret).getResumedSubstatement();
216 return (AbstractResumedStatement<?, ?, ?>) ret;
220 * End the specified phase for this statement and return this statement's declared parent statement.
222 * @param phase processing phase that ended
223 * @return Declared parent statement
225 final @Nullable AbstractResumedStatement<?, ?, ?> exitStatement(final ModelProcessingPhase phase) {
226 finishDeclaration(phase);
227 final var parent = getParentContext();
228 if (parent == null) {
232 var ret = verifyParent(parent);
233 // Unwind all undeclared statements
234 while (!(ret instanceof AbstractResumedStatement)) {
235 ret.finishDeclaration(phase);
236 ret = verifyParent(ret.getParentContext());
238 return (AbstractResumedStatement<?, ?, ?>) ret;
241 // FIXME: AbstractResumedStatement should only ever have OriginalStmtCtx parents, which would remove the need for
242 // this method. In ordered to do that we need to untangle SubstatementContext's users and do not allow it
243 // being reparent()ed.
244 private static OriginalStmtCtx<?, ?, ?> verifyParent(final StatementContextBase<?, ?, ?> parent) {
245 verify(parent instanceof OriginalStmtCtx, "Unexpected parent context %s", parent);
246 return (OriginalStmtCtx<?, ?, ?>) parent;
249 final void resizeSubstatements(final int expectedSize) {
250 substatements = substatements.ensureCapacity(expectedSize);
254 final void declarationFinished(final ModelProcessingPhase phase) {
255 finishChildrenDeclaration(phase);
256 finishDeclaration(phase);
259 private void finishChildrenDeclaration(final ModelProcessingPhase phase) {
260 checkState(isFullyDefined());
261 substatements.forEach(stmt -> stmt.declarationFinished(phase));