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 static java.util.Objects.requireNonNull;
12 import com.google.common.annotations.Beta;
13 import com.google.common.collect.ImmutableList;
14 import com.google.common.collect.ImmutableMap;
15 import java.util.Collection;
16 import java.util.LinkedHashMap;
18 import java.util.Optional;
19 import org.eclipse.jdt.annotation.NonNull;
20 import org.opendaylight.yangtools.yang.common.QName;
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.IdentifierNamespace;
24 import org.opendaylight.yangtools.yang.model.api.stmt.CaseEffectiveStatement;
25 import org.opendaylight.yangtools.yang.model.api.stmt.ChoiceEffectiveStatement;
26 import org.opendaylight.yangtools.yang.model.api.stmt.DataTreeEffectiveStatement;
27 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaTreeEffectiveStatement;
28 import org.opendaylight.yangtools.yang.parser.spi.source.SourceException;
29 import org.opendaylight.yangtools.yang.parser.spi.source.StatementSourceReference;
32 * Baseline stateless implementation of an EffectiveStatement. This class adds a few default implementations and
33 * namespace dispatch, but does not actually force any state on its subclasses. This approach is different from
34 * {@link EffectiveStatementBase} in that it adds requirements for an implementation, but it leaves it up to the final
35 * class to provide object layout.
38 * This finds immense value in catering the common case, for example effective statements which can, but typically
39 * do not, contain substatements.
41 * @param <A> Argument type ({@link Void} if statement does not have argument.)
42 * @param <D> Class representing declared version of this statement.
45 public abstract class AbstractEffectiveStatement<A, D extends DeclaredStatement<A>>
46 extends AbstractModelStatement<A> implements EffectiveStatement<A, D> {
48 public final <K, V, N extends IdentifierNamespace<K, V>> Optional<? extends V> get(final Class<N> namespace,
50 return Optional.ofNullable(getAll(namespace).get(requireNonNull(identifier)));
54 public final <K, V, N extends IdentifierNamespace<K, V>> Map<K, V> getAll(final Class<N> namespace) {
55 final Optional<? extends Map<K, V>> ret = getNamespaceContents(requireNonNull(namespace));
56 return ret.isPresent() ? ret.get() : ImmutableMap.of();
60 public Collection<? extends EffectiveStatement<?, ?>> effectiveSubstatements() {
61 return ImmutableList.of();
65 * Return the statement-specific contents of specified namespace, if available.
67 * @param namespace Requested namespace
68 * @return Namespace contents, if available.
70 protected <K, V, N extends IdentifierNamespace<K, V>> Optional<? extends Map<K, V>> getNamespaceContents(
71 final @NonNull Class<N> namespace) {
72 return Optional.empty();
76 * Utility method for recovering singleton lists squashed by {@link #maskList(ImmutableList)}.
78 * @param masked list to unmask
79 * @return Unmasked list
80 * @throws NullPointerException if masked is null
81 * @throws ClassCastException if masked object does not match EffectiveStatement
83 @SuppressWarnings({ "rawtypes", "unchecked" })
84 protected static final @NonNull ImmutableList<? extends EffectiveStatement<?, ?>> unmaskList(
85 final @NonNull Object masked) {
86 return (ImmutableList) unmaskList(masked, EffectiveStatement.class);
89 // TODO: below methods need to find a better place, this is just a temporary hideout as their public class is on
91 static @NonNull Map<QName, SchemaTreeEffectiveStatement<?>> createSchemaTreeNamespace(
92 final StatementSourceReference ref, final Collection<? extends EffectiveStatement<?, ?>> substatements) {
93 final Map<QName, SchemaTreeEffectiveStatement<?>> schemaChildren = new LinkedHashMap<>();
94 substatements.stream().filter(SchemaTreeEffectiveStatement.class::isInstance)
95 .forEach(child -> putChild(schemaChildren, (SchemaTreeEffectiveStatement) child, ref, "schema"));
96 return schemaChildren;
99 static @NonNull ImmutableMap<QName, DataTreeEffectiveStatement<?>> createDataTreeNamespace(
100 final StatementSourceReference ref,
101 final Collection<SchemaTreeEffectiveStatement<?>> schemaTreeStatements,
102 // Note: this dance is needed to not retain ImmutableMap$Values
103 final ImmutableMap<QName, SchemaTreeEffectiveStatement<?>> schemaTreeNamespace) {
104 final Map<QName, DataTreeEffectiveStatement<?>> dataChildren = new LinkedHashMap<>();
105 boolean sameAsSchema = true;
107 for (SchemaTreeEffectiveStatement<?> child : schemaTreeStatements) {
108 if (child instanceof DataTreeEffectiveStatement) {
109 putChild(dataChildren, (DataTreeEffectiveStatement<?>) child, ref, "data");
111 sameAsSchema = false;
112 putChoiceDataChildren(dataChildren, ref, child);
116 // This is a mighty hack to lower memory usage: if we consumed all schema tree children as data nodes,
117 // the two maps are equal and hence we can share the instance.
118 return sameAsSchema ? (ImmutableMap) schemaTreeNamespace : ImmutableMap.copyOf(dataChildren);
121 private static <T extends SchemaTreeEffectiveStatement<?>> void putChild(final Map<QName, T> map,
122 final T child, final StatementSourceReference ref, final String tree) {
123 final QName id = child.getIdentifier();
124 final T prev = map.putIfAbsent(id, child);
125 SourceException.throwIf(prev != null, ref,
126 "Cannot add %s tree child with name %s, a conflicting child already exists", tree, id);
129 private static void putChoiceDataChildren(final Map<QName, DataTreeEffectiveStatement<?>> map,
130 final StatementSourceReference ref, final SchemaTreeEffectiveStatement<?> child) {
131 // For choice statements go through all their cases and fetch their data children
132 if (child instanceof ChoiceEffectiveStatement) {
133 child.streamEffectiveSubstatements(CaseEffectiveStatement.class).forEach(
134 caseStmt -> caseStmt.streamEffectiveSubstatements(SchemaTreeEffectiveStatement.class).forEach(stmt -> {
135 if (stmt instanceof DataTreeEffectiveStatement) {
136 putChild(map, (DataTreeEffectiveStatement<?>) stmt, ref, "data");
138 putChoiceDataChildren(map, ref, stmt);