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.EffectiveStmtCtx.Current;
25 import org.opendaylight.yangtools.yang.parser.spi.meta.StatementSupport;
26 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
29 * Implementation-internal base class for {@link StatementSupport} 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 StatementSupport<A, D, E> {
42 protected BaseStatementSupport(final StatementDefinition publicDefinition, final CopyPolicy copyPolicy) {
43 super(publicDefinition, copyPolicy);
46 protected BaseStatementSupport(final StatementDefinition publicDefinition, final StatementPolicy<A, D> policy) {
47 super(publicDefinition, policy);
51 public final D createDeclared(final StmtContext<A, D, ?> ctx) {
52 final ImmutableList<? extends DeclaredStatement<?>> substatements = ctx.declaredSubstatements().stream()
53 .map(StmtContext::declared)
54 .collect(ImmutableList.toImmutableList());
55 return substatements.isEmpty() ? createEmptyDeclared(ctx) : createDeclared(ctx, substatements);
58 protected abstract @NonNull D createDeclared(@NonNull StmtContext<A, D, ?> ctx,
59 @NonNull ImmutableList<? extends DeclaredStatement<?>> substatements);
61 protected abstract @NonNull D createEmptyDeclared(@NonNull StmtContext<A, D, ?> ctx);
64 public E createEffective(final Current<A, D> stmt,
65 final Stream<? extends StmtContext<?, ?, ?>> declaredSubstatements,
66 final Stream<? extends StmtContext<?, ?, ?>> effectiveSubstatements) {
67 final ImmutableList<? extends EffectiveStatement<?, ?>> substatements =
68 buildEffectiveSubstatements(stmt, statementsToBuild(stmt,
69 declaredSubstatements(declaredSubstatements, effectiveSubstatements)));
70 return createEffective(stmt, substatements);
73 protected abstract @NonNull E createEffective(@NonNull Current<A, D> stmt,
74 @NonNull ImmutableList<? extends EffectiveStatement<?, ?>> substatements);
77 * Give statement support a hook to transform statement contexts before they are built. Default implementation
78 * does nothing, but note {@code augment} statement performs a real transformation.
80 * @param ctx Effective capture of this statement's significant state
81 * @param substatements Substatement contexts which have been determined to be built
82 * @return Substatement context which are to be actually built
84 protected List<? extends StmtContext<?, ?, ?>> statementsToBuild(final Current<A, D> ctx,
85 final List<? extends StmtContext<?, ?, ?>> substatements) {
89 protected static final <E extends EffectiveStatement<?, ?>> @Nullable E findFirstStatement(
90 final ImmutableList<? extends EffectiveStatement<?, ?>> statements, final Class<E> type) {
91 for (EffectiveStatement<?, ?> stmt : statements) {
92 if (type.isInstance(stmt)) {
93 return type.cast(stmt);
99 protected static final <A, E extends EffectiveStatement<A, ?>> A findFirstArgument(
100 final ImmutableList<? extends EffectiveStatement<?, ?>> statements, final Class<@NonNull E> type,
102 final @Nullable E stmt = findFirstStatement(statements, type);
103 return stmt != null ? stmt.argument() : defValue;
107 * Create a set of substatements. This method is split out so it can be overridden in subclasses adjust the
108 * resulting statements.
110 * @param stmt Current statement context
111 * @param substatements proposed substatements
112 * @return Built effective substatements
114 protected @NonNull ImmutableList<? extends EffectiveStatement<?, ?>> buildEffectiveSubstatements(
115 final Current<A, D> stmt, final List<? extends StmtContext<?, ?, ?>> substatements) {
116 return defaultBuildEffectiveSubstatements(substatements);
119 private static @NonNull ImmutableList<? extends EffectiveStatement<?, ?>> defaultBuildEffectiveSubstatements(
120 final List<? extends StmtContext<?, ?, ?>> substatements) {
121 return substatements.stream()
122 .filter(StmtContext::isSupportedToBuildEffective)
123 .map(StmtContext::buildEffective)
124 .collect(ImmutableList.toImmutableList());
127 private static @NonNull List<StmtContext<?, ?, ?>> declaredSubstatements(
128 final Stream<? extends StmtContext<?, ?, ?>> declaredSubstatements,
129 final Stream<? extends StmtContext<?, ?, ?>> effectiveSubstatements) {
131 * This dance is required to ensure that effects of 'uses' nodes are applied in the same order as
132 * the statements were defined -- i.e. if we have something like this:
151 * The reactor would first inline 'uses baz' as that definition is the first one completely resolved and then
152 * inline 'uses bar'. Here we are iterating in declaration order re-inline the statements.
154 * FIXME: 7.0.0: this really should be handled by UsesStatementSupport such that 'uses baz' would have a
155 * prerequisite of a resolved 'uses bar'.
157 final List<StmtContext<?, ?, ?>> declaredInit = declaredSubstatements
158 .filter(StmtContext::isSupportedByFeatures)
159 .collect(Collectors.toList());
161 final List<StmtContext<?, ?, ?>> substatementsInit = new ArrayList<>();
162 Set<StmtContext<?, ?, ?>> filteredStatements = null;
163 for (final StmtContext<?, ?, ?> declaredSubstatement : declaredInit) {
164 substatementsInit.add(declaredSubstatement);
166 final Collection<? extends StmtContext<?, ?, ?>> effect = declaredSubstatement.getEffectOfStatement();
167 if (!effect.isEmpty()) {
168 if (filteredStatements == null) {
169 filteredStatements = new HashSet<>();
171 filteredStatements.addAll(effect);
172 substatementsInit.addAll(effect);
176 final Stream<? extends StmtContext<?, ?, ?>> effective;
177 if (filteredStatements != null) {
178 final Set<StmtContext<?, ?, ?>> filtered = filteredStatements;
179 effective = effectiveSubstatements.filter(stmt -> !filtered.contains(stmt));
181 effective = effectiveSubstatements;
184 substatementsInit.addAll(effective.collect(Collectors.toList()));
185 return substatementsInit;