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.rfc7950.stmt;
10 import com.google.common.annotations.Beta;
11 import com.google.common.collect.ImmutableList;
12 import java.util.ArrayList;
13 import java.util.Collection;
14 import java.util.HashSet;
15 import java.util.List;
17 import java.util.stream.Collectors;
18 import java.util.stream.Stream;
19 import org.eclipse.jdt.annotation.NonNull;
20 import org.eclipse.jdt.annotation.Nullable;
21 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
22 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
23 import org.opendaylight.yangtools.yang.model.api.meta.StatementDefinition;
24 import org.opendaylight.yangtools.yang.parser.spi.meta.AbstractStatementSupport;
25 import org.opendaylight.yangtools.yang.parser.spi.meta.EffectiveStmtCtx.Current;
26 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
29 * Implementation-internal base class for {@link AbstractStatementSupport} implementations.
31 * @param <A> Argument type
32 * @param <D> Declared Statement representation
33 * @param <E> Effective Statement representation
35 // FIXME: YANGTOOLS-1161: move this into yang-parser-spi, as the substatement handling has natural place there. Also
36 // we rely on getEffectOfStatement() -- which is something reactor mechanics need to make work better.
38 public abstract class BaseStatementSupport<A, D extends DeclaredStatement<A>,
39 E extends EffectiveStatement<A, D>> extends AbstractStatementSupport<A, D, E> {
41 protected BaseStatementSupport(final StatementDefinition publicDefinition, final CopyPolicy copyPolicy) {
42 super(publicDefinition, copyPolicy);
46 public final D createDeclared(final StmtContext<A, D, ?> ctx) {
47 final ImmutableList<? extends DeclaredStatement<?>> substatements = ctx.declaredSubstatements().stream()
48 .map(StmtContext::declared)
49 .collect(ImmutableList.toImmutableList());
50 return substatements.isEmpty() ? createEmptyDeclared(ctx) : createDeclared(ctx, substatements);
53 protected abstract @NonNull D createDeclared(@NonNull StmtContext<A, D, ?> ctx,
54 @NonNull ImmutableList<? extends DeclaredStatement<?>> substatements);
56 protected abstract @NonNull D createEmptyDeclared(@NonNull StmtContext<A, D, ?> ctx);
59 public E createEffective(final Current<A, D> stmt,
60 final Stream<? extends StmtContext<?, ?, ?>> declaredSubstatements,
61 final Stream<? extends StmtContext<?, ?, ?>> effectiveSubstatements) {
62 final ImmutableList<? extends EffectiveStatement<?, ?>> substatements =
63 buildEffectiveSubstatements(stmt, statementsToBuild(stmt,
64 declaredSubstatements(declaredSubstatements, effectiveSubstatements)));
65 return createEffective(stmt, substatements);
68 protected abstract @NonNull E createEffective(@NonNull Current<A, D> stmt,
69 @NonNull ImmutableList<? extends EffectiveStatement<?, ?>> substatements);
72 * Give statement support a hook to transform statement contexts before they are built. Default implementation
73 * does nothing, but note {@code augment} statement performs a real transformation.
75 * @param ctx Effective capture of this statement's significant state
76 * @param substatements Substatement contexts which have been determined to be built
77 * @return Substatement context which are to be actually built
79 protected List<? extends StmtContext<?, ?, ?>> statementsToBuild(final Current<A, D> ctx,
80 final List<? extends StmtContext<?, ?, ?>> substatements) {
84 protected static final <E extends EffectiveStatement<?, ?>> @Nullable E findFirstStatement(
85 final ImmutableList<? extends EffectiveStatement<?, ?>> statements, final Class<E> type) {
86 for (EffectiveStatement<?, ?> stmt : statements) {
87 if (type.isInstance(stmt)) {
88 return type.cast(stmt);
94 protected static final <A, E extends EffectiveStatement<A, ?>> A findFirstArgument(
95 final ImmutableList<? extends EffectiveStatement<?, ?>> statements, final Class<@NonNull E> type,
97 final @Nullable E stmt = findFirstStatement(statements, type);
98 return stmt != null ? stmt.argument() : defValue;
102 * Create a set of substatements. This method is split out so it can be overridden in subclasses adjust the
103 * resulting statements.
105 * @param stmt Current statement context
106 * @param substatements proposed substatements
107 * @return Built effective substatements
109 protected @NonNull ImmutableList<? extends EffectiveStatement<?, ?>> buildEffectiveSubstatements(
110 final Current<A, D> stmt, final List<? extends StmtContext<?, ?, ?>> substatements) {
111 return defaultBuildEffectiveSubstatements(substatements);
114 private static @NonNull ImmutableList<? extends EffectiveStatement<?, ?>> defaultBuildEffectiveSubstatements(
115 final List<? extends StmtContext<?, ?, ?>> substatements) {
116 return substatements.stream()
117 .filter(StmtContext::isSupportedToBuildEffective)
118 .map(StmtContext::buildEffective)
119 .collect(ImmutableList.toImmutableList());
122 private static @NonNull List<StmtContext<?, ?, ?>> declaredSubstatements(
123 final Stream<? extends StmtContext<?, ?, ?>> declaredSubstatements,
124 final Stream<? extends StmtContext<?, ?, ?>> effectiveSubstatements) {
126 * This dance is required to ensure that effects of 'uses' nodes are applied in the same order as
127 * the statements were defined -- i.e. if we have something like this:
146 * The reactor would first inline 'uses baz' as that definition is the first one completely resolved and then
147 * inline 'uses bar'. Here we are iterating in declaration order re-inline the statements.
149 * FIXME: 7.0.0: this really should be handled by UsesStatementSupport such that 'uses baz' would have a
150 * prerequisite of a resolved 'uses bar'.
152 final List<StmtContext<?, ?, ?>> declaredInit = declaredSubstatements
153 .filter(StmtContext::isSupportedByFeatures)
154 .collect(Collectors.toList());
156 final List<StmtContext<?, ?, ?>> substatementsInit = new ArrayList<>();
157 Set<StmtContext<?, ?, ?>> filteredStatements = null;
158 for (final StmtContext<?, ?, ?> declaredSubstatement : declaredInit) {
159 substatementsInit.add(declaredSubstatement);
161 final Collection<? extends StmtContext<?, ?, ?>> effect = declaredSubstatement.getEffectOfStatement();
162 if (!effect.isEmpty()) {
163 if (filteredStatements == null) {
164 filteredStatements = new HashSet<>();
166 filteredStatements.addAll(effect);
167 substatementsInit.addAll(effect);
171 final Stream<? extends StmtContext<?, ?, ?>> effective;
172 if (filteredStatements != null) {
173 final Set<StmtContext<?, ?, ?>> filtered = filteredStatements;
174 effective = effectiveSubstatements.filter(stmt -> !filtered.contains(stmt));
176 effective = effectiveSubstatements;
179 substatementsInit.addAll(effective.collect(Collectors.toList()));
180 return substatementsInit;