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.
26 * Argument type ({@link Void} if statement does not have argument.)
28 * Class representing declared version of this statement.
30 public interface EffectiveStatement<A, S extends DeclaredStatement<A>> extends ModelStatement<A> {
33 * Returns statement, which was explicit declaration of this effective
36 * @return statement, which was explicit declaration of this effective
37 * statement or null if statement was inferred from context.
43 * Returns value associated with supplied identifier.
45 * @param <K> Identifier type
46 * @param <V> Value type
47 * @param <N> Namespace identifier type
48 * @param namespace Namespace type
49 * @param identifier Identifier of element.
50 * @return Value if present, null otherwise.
52 //<K, V, N extends IdentifierNamespace<? super K, ? extends V>> V
53 // FIXME: 3.0.0: make this return an Optional, not a nullable
55 <K, V, N extends IdentifierNamespace<K, V>> V get(@Nonnull Class<N> namespace, @Nonnull K identifier);
58 * Returns all local values from supplied namespace.
60 * @param <K> Identifier type
61 * @param <V> Value type
62 * @param <N> Namespace identifier type
63 * @param namespace Namespace type
64 * @return Value if present, null otherwise.
66 // FIXME: 3.0.0: make this contract return empty maps on non-presence
68 <K, V, N extends IdentifierNamespace<K, V>> Map<K, V> getAll(@Nonnull Class<N> namespace);
71 * Returns all local values from supplied namespace.
73 * @param <K> Identifier type
74 * @param <V> Value type
75 * @param <N> Namespace identifier type
76 * @param namespace Namespace type
77 * @return Key-value mappings, empty if the namespace does not exist.
79 // FIXME: 3.0.0: remove this in favor of fixed getAll()
80 default <K, V, N extends IdentifierNamespace<K, V>> @NonNull Map<K, V> findAll(@NonNull final Class<N> namespace) {
81 final Map<K, V> map = getAll(requireNonNull(namespace));
82 return map == null ? ImmutableMap.of() : map;
86 * Returns a collection of all effective substatements.
88 * @return collection of all effective substatements.
90 @Nonnull Collection<? extends EffectiveStatement<?, ?>> effectiveSubstatements();
93 * Find the first effective substatement of specified type.
95 * @return First effective substatement, or empty if no match is found.
98 default <T extends EffectiveStatement<?, ?>> Optional<T> findFirstEffectiveSubstatement(
99 @Nonnull final Class<T> type) {
100 return effectiveSubstatements().stream().filter(type::isInstance).findFirst().map(type::cast);
104 * Find the first effective substatement of specified type and return its value.
106 * @return First effective substatement's argument, or empty if no match is found.
109 default <V, T extends EffectiveStatement<V, ?>> Optional<V> findFirstEffectiveSubstatementArgument(
110 @Nonnull final Class<T> type) {
111 return findFirstEffectiveSubstatement(type).map(EffectiveStatement::argument);
115 * Find all effective substatements of specified type and return them as a stream.
117 * @return A stream of all effective substatements of specified type.
120 default <T extends EffectiveStatement<?, ?>> Stream<T> streamEffectiveSubstatements(@Nonnull final Class<T> type) {
121 return effectiveSubstatements().stream().filter(type::isInstance).map(type::cast);