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 java.util.Collection;
15 import java.util.Optional;
16 import java.util.stream.Stream;
17 import org.eclipse.jdt.annotation.NonNull;
18 import org.eclipse.jdt.annotation.Nullable;
21 * Effective model statement which should be used to derive application behaviour.
23 * @param <A> Argument type ({@link Void} if statement does not have argument.)
24 * @param <D> Class representing declared version of this statement.
26 public interface EffectiveStatement<A, D extends DeclaredStatement<A>> extends ModelStatement<A> {
28 * Returns statement, which was explicit declaration of this effective
31 * @return statement, which was explicit declaration of this effective
32 * statement or null if statement was inferred from context.
34 @Nullable D getDeclared();
37 * Returns value associated with supplied identifier.
39 * @param <K> Identifier type
40 * @param <V> Value type
41 * @param <N> Namespace identifier type
42 * @param namespace Namespace type
43 * @param identifier Identifier of element.
44 * @return Value if present
46 //<K, V, N extends IdentifierNamespace<? super K, ? extends V>> V
47 <K, V, N extends IdentifierNamespace<K, V>> Optional<? extends V> get(@NonNull Class<N> namespace,
48 @NonNull K identifier);
51 * Returns all local values from supplied namespace.
53 * @param <K> Identifier type
54 * @param <V> Value type
55 * @param <N> Namespace identifier type
56 * @param namespace Namespace type
57 * @return Key-value mappings, empty if the namespace does not exist.
58 * @throws NullPointerException if namespace is null
60 <K, V, N extends IdentifierNamespace<K, V>> @NonNull Map<K, V> getAll(@NonNull Class<N> namespace);
63 * Returns all local values from supplied namespace.
65 * @param <K> Identifier type
66 * @param <V> Value type
67 * @param <N> Namespace identifier type
68 * @param namespace Namespace type
69 * @return Key-value mappings, empty if the namespace does not exist.
70 * @throws NullPointerException if namespace is null
71 * @deprecated Use {@link #getAll(Class)} instead
73 @Deprecated(forRemoval = true)
74 default <K, V, N extends IdentifierNamespace<K, V>> @NonNull Map<K, V> findAll(final @NonNull Class<N> namespace) {
75 return getAll(requireNonNull(namespace));
79 * Returns a collection of all effective substatements.
81 * @return collection of all effective substatements.
83 @NonNull Collection<? extends EffectiveStatement<?, ?>> effectiveSubstatements();
86 * Find the first effective substatement of specified type.
88 * @return First effective substatement, or empty if no match is found.
91 default <T> Optional<T> findFirstEffectiveSubstatement(final @NonNull Class<T> type) {
92 return effectiveSubstatements().stream().filter(type::isInstance).findFirst().map(type::cast);
96 * Find the first effective substatement of specified type and return its value.
98 * @return First effective substatement's argument, or empty if no match is found.
101 default <V, T extends EffectiveStatement<V, ?>> Optional<V> findFirstEffectiveSubstatementArgument(
102 final @NonNull Class<T> type) {
103 return findFirstEffectiveSubstatement(type).map(EffectiveStatement::argument);
107 * Find all effective substatements of specified type and return them as a stream.
109 * @return A stream of all effective substatements of specified type.
112 default <T extends EffectiveStatement<?, ?>> Stream<T> streamEffectiveSubstatements(final @NonNull Class<T> type) {
113 return effectiveSubstatements().stream().filter(type::isInstance).map(type::cast);