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 adds requirements for an
34 * implementation, but it leaves it up to the final class to provide object layout.
37 * This finds immense value in catering the common case, for example effective statements which can, but typically
38 * do not, contain substatements.
40 * @param <A> Argument type ({@link Void} if statement does not have argument.)
41 * @param <D> Class representing declared version of this statement.
44 public abstract class AbstractEffectiveStatement<A, D extends DeclaredStatement<A>>
45 extends AbstractModelStatement<A> implements EffectiveStatement<A, D> {
47 public final <K, V, N extends IdentifierNamespace<K, V>> Optional<? extends V> get(final Class<N> namespace,
49 return Optional.ofNullable(getAll(namespace).get(requireNonNull(identifier)));
53 public final <K, V, N extends IdentifierNamespace<K, V>> Map<K, V> getAll(final Class<N> namespace) {
54 final Optional<? extends Map<K, V>> ret = getNamespaceContents(requireNonNull(namespace));
55 return ret.isPresent() ? ret.get() : ImmutableMap.of();
59 public Collection<? extends EffectiveStatement<?, ?>> effectiveSubstatements() {
60 return ImmutableList.of();
64 * Return the statement-specific contents of specified namespace, if available.
66 * @param namespace Requested namespace
67 * @return Namespace contents, if available.
69 protected <K, V, N extends IdentifierNamespace<K, V>> Optional<? extends Map<K, V>> getNamespaceContents(
70 final @NonNull Class<N> namespace) {
71 return Optional.empty();
75 * Utility method for recovering singleton lists squashed by {@link #maskList(ImmutableList)}.
77 * @param masked list to unmask
78 * @return Unmasked list
79 * @throws NullPointerException if masked is null
80 * @throws ClassCastException if masked object does not match EffectiveStatement
82 @SuppressWarnings({ "rawtypes", "unchecked" })
83 protected static final @NonNull ImmutableList<? extends EffectiveStatement<?, ?>> unmaskList(
84 final @NonNull Object masked) {
85 return (ImmutableList) unmaskList(masked, EffectiveStatement.class);
88 // TODO: below methods need to find a better place, this is just a temporary hideout as their public class is on
90 static @NonNull Map<QName, SchemaTreeEffectiveStatement<?>> createSchemaTreeNamespace(
91 final StatementSourceReference ref, final Collection<? extends EffectiveStatement<?, ?>> substatements) {
92 final Map<QName, SchemaTreeEffectiveStatement<?>> schemaChildren = new LinkedHashMap<>();
93 substatements.stream().filter(SchemaTreeEffectiveStatement.class::isInstance)
94 .forEach(child -> putChild(schemaChildren, (SchemaTreeEffectiveStatement) child, ref, "schema"));
95 return schemaChildren;
98 static @NonNull ImmutableMap<QName, DataTreeEffectiveStatement<?>> createDataTreeNamespace(
99 final StatementSourceReference ref,
100 final Collection<SchemaTreeEffectiveStatement<?>> schemaTreeStatements,
101 // Note: this dance is needed to not retain ImmutableMap$Values
102 final ImmutableMap<QName, SchemaTreeEffectiveStatement<?>> schemaTreeNamespace) {
103 final Map<QName, DataTreeEffectiveStatement<?>> dataChildren = new LinkedHashMap<>();
104 boolean sameAsSchema = true;
106 for (SchemaTreeEffectiveStatement<?> child : schemaTreeStatements) {
107 if (child instanceof DataTreeEffectiveStatement) {
108 putChild(dataChildren, (DataTreeEffectiveStatement<?>) child, ref, "data");
110 sameAsSchema = false;
111 putChoiceDataChildren(dataChildren, ref, child);
115 // This is a mighty hack to lower memory usage: if we consumed all schema tree children as data nodes,
116 // the two maps are equal and hence we can share the instance.
117 return sameAsSchema ? (ImmutableMap) schemaTreeNamespace : ImmutableMap.copyOf(dataChildren);
120 private static <T extends SchemaTreeEffectiveStatement<?>> void putChild(final Map<QName, T> map,
121 final T child, final StatementSourceReference ref, final String tree) {
122 final QName id = child.getIdentifier();
123 final T prev = map.putIfAbsent(id, child);
124 SourceException.throwIf(prev != null, ref,
125 "Cannot add %s tree child with name %s, a conflicting child already exists", tree, id);
128 private static void putChoiceDataChildren(final Map<QName, DataTreeEffectiveStatement<?>> map,
129 final StatementSourceReference ref, final SchemaTreeEffectiveStatement<?> child) {
130 // For choice statements go through all their cases and fetch their data children
131 if (child instanceof ChoiceEffectiveStatement) {
132 child.streamEffectiveSubstatements(CaseEffectiveStatement.class).forEach(
133 caseStmt -> caseStmt.streamEffectiveSubstatements(SchemaTreeEffectiveStatement.class).forEach(stmt -> {
134 if (stmt instanceof DataTreeEffectiveStatement) {
135 putChild(map, (DataTreeEffectiveStatement<?>) stmt, ref, "data");
137 putChoiceDataChildren(map, ref, stmt);