2 * Copyright (c) 2015 Cisco Systems, Inc. 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.model.api.meta;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.annotations.Beta;
13 import com.google.common.collect.ImmutableMap;
14 import java.util.Collection;
16 import java.util.Optional;
17 import java.util.stream.Stream;
18 import javax.annotation.Nonnull;
19 import javax.annotation.Nullable;
20 import org.eclipse.jdt.annotation.NonNull;
23 * Effective model statement which should be used to derive application behaviour.
25 * @param <A> Argument type ({@link Void} if statement does not have argument.)
26 * @param <D> Class representing declared version of this statement.
28 public interface EffectiveStatement<A, D extends DeclaredStatement<A>> extends ModelStatement<A> {
30 * Returns statement, which was explicit declaration of this effective
33 * @return statement, which was explicit declaration of this effective
34 * statement or null if statement was inferred from context.
40 * Returns value associated with supplied identifier.
42 * @param <K> Identifier type
43 * @param <V> Value type
44 * @param <N> Namespace identifier type
45 * @param namespace Namespace type
46 * @param identifier Identifier of element.
47 * @return Value if present, null otherwise.
49 //<K, V, N extends IdentifierNamespace<? super K, ? extends V>> V
50 // FIXME: 3.0.0: make this return an Optional, not a nullable
52 <K, V, N extends IdentifierNamespace<K, V>> V get(@Nonnull Class<N> namespace, @Nonnull K identifier);
55 * Returns all local values from supplied namespace.
57 * @param <K> Identifier type
58 * @param <V> Value type
59 * @param <N> Namespace identifier type
60 * @param namespace Namespace type
61 * @return Value if present, null otherwise.
63 // FIXME: 3.0.0: make this contract return empty maps on non-presence
65 <K, V, N extends IdentifierNamespace<K, V>> Map<K, V> getAll(@Nonnull Class<N> namespace);
68 * Returns all local values from supplied namespace.
70 * @param <K> Identifier type
71 * @param <V> Value type
72 * @param <N> Namespace identifier type
73 * @param namespace Namespace type
74 * @return Key-value mappings, empty if the namespace does not exist.
76 // FIXME: 3.0.0: remove this in favor of fixed getAll()
77 default <K, V, N extends IdentifierNamespace<K, V>> @NonNull Map<K, V> findAll(@NonNull final Class<N> namespace) {
78 final Map<K, V> map = getAll(requireNonNull(namespace));
79 return map == null ? ImmutableMap.of() : map;
83 * Returns a collection of all effective substatements.
85 * @return collection of all effective substatements.
87 @Nonnull Collection<? extends EffectiveStatement<?, ?>> effectiveSubstatements();
90 * Find the first effective substatement of specified type.
92 * @return First effective substatement, or empty if no match is found.
95 default <T extends EffectiveStatement<?, ?>> Optional<T> findFirstEffectiveSubstatement(
96 @Nonnull final Class<T> type) {
97 return effectiveSubstatements().stream().filter(type::isInstance).findFirst().map(type::cast);
101 * Find the first effective substatement of specified type and return its value.
103 * @return First effective substatement's argument, or empty if no match is found.
106 default <V, T extends EffectiveStatement<V, ?>> Optional<V> findFirstEffectiveSubstatementArgument(
107 @Nonnull final Class<T> type) {
108 return effectiveSubstatements().stream().filter(type::isInstance).findFirst().map(type::cast)
109 .map(EffectiveStatement::argument);
113 * Find all effective substatements of specified type and return them as a stream.
115 * @return A stream of all effective substatements of specified type.
118 default <T extends EffectiveStatement<?, ?>> Stream<T> streamEffectiveSubstatements(@Nonnull final Class<T> type) {
119 return effectiveSubstatements().stream().filter(type::isInstance).map(type::cast);