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.parser.spi.meta;
10 import java.util.Collection;
11 import java.util.stream.Stream;
12 import org.eclipse.jdt.annotation.NonNull;
13 import org.eclipse.jdt.annotation.Nullable;
14 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
15 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
16 import org.opendaylight.yangtools.yang.parser.spi.meta.EffectiveStmtCtx.Current;
19 * An entity capable of creating {@link DeclaredStatement} and {@link EffectiveStatement} instances for a particular
20 * type. This interface is usually realized as an implementation-specific combination with {@link StatementSupport}.
22 * @param <A> Argument type
23 * @param <D> Declared Statement representation
24 * @param <E> Effective Statement representation
26 public interface StatementFactory<A, D extends DeclaredStatement<A>, E extends EffectiveStatement<A, D>> {
28 * Create a {@link DeclaredStatement} for specified context.
30 * @param ctx Statement context
31 * @param substatements Declared substatements
32 * @return A declared statement instance.
34 // FIXME: CommonStmtCtx should be enough here
35 @NonNull D createDeclared(@NonNull StmtContext<A, D, ?> ctx, @NonNull Stream<DeclaredStatement<?>> substatements);
38 * Create a {@link EffectiveStatement} for specified context.
40 * @param stmt Effective capture of this statement's significant state
41 * @param declaredSubstatements effectively-visible declared substatements
42 * @param inferredSubstatements effectively-visible inferred substatements
43 * @return An effective statement instance
45 // FIXME: we really want a single coherent 'effectiveSubstatements' stream
46 @NonNull E createEffective(@NonNull Current<A, D> stmt,
47 Stream<? extends StmtContext<?, ?, ?>> declaredSubstatements,
48 Stream<? extends StmtContext<?, ?, ?>> inferredSubstatements);
51 * Create a {@link EffectiveStatement} copy of provided original for specified context.
53 * @param stmt Effective capture of this statement's significant state
54 * @param original Original effective statement
55 * @return An effective statement instance
56 * @throws NullPointerException if any argument is null
58 @NonNull E copyEffective(@NonNull Current<A, D> stmt, @NonNull E original);
61 * Determine reactor copy behaviour of a statement instance. Implementations classes are required to determine
62 * their operations with regard to their statements being replicated into different contexts -- potentially sharing
66 * Implementations are examine {@code copy} as to whether it would result in the same semantics as {@code current}
67 * does, provided that {@code current}'s {@code substatements} are properly propagated.
69 * @param copy Copy of current effective context
70 * @param current Current effective context
71 * @param substatements Current effective substatements
72 * @return True if the differences between {@code copy} and {@code current} do not affect this statement's effective
74 * @throws NullPointerException if any argument is null
76 boolean canReuseCurrent(@NonNull Current<A, D> copy, @NonNull Current<A, D> current,
77 @NonNull Collection<? extends EffectiveStatement<?, ?>> substatements);
80 * Return the {@link EffectiveStatementState} for a particular statement. This acts as a summary for comparison with
81 * statements created by this factory, without taking substatements into account. This is an optional operation, it
82 * is always safe to return null.
84 * @param stmt EffectiveStatement to examine
85 * @return EffectiveStatementState or null if the statement cannot be expressed
87 @Nullable EffectiveStatementState extractEffectiveState(@NonNull E stmt);