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 com.google.common.annotations.Beta;
11 import com.google.common.cache.CacheBuilder;
12 import com.google.common.cache.CacheLoader;
13 import com.google.common.cache.LoadingCache;
14 import com.google.common.collect.ImmutableList;
15 import java.util.concurrent.ExecutionException;
16 import org.eclipse.jdt.annotation.NonNull;
17 import org.opendaylight.yangtools.yang.model.api.meta.DeclaredStatement;
18 import org.opendaylight.yangtools.yang.model.api.meta.EffectiveStatement;
19 import org.opendaylight.yangtools.yang.model.api.meta.StatementDefinition;
20 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
23 * A {@link BaseStatementSupport} specialized for global interning. This base class is useful when the argument can be
24 * reasonably interned and it dominates the {@link EffectiveStatement} implementation. Typical examples include
25 * {@code position} and {@code value} statements, which typically do not have substatements and are based on simple
29 * Note: use of this base class implies context-independence.
32 public abstract class BaseInternedStatementSupport<A, D extends DeclaredStatement<A>,
33 E extends EffectiveStatement<A, D>> extends BaseStatementSupport<A, D, E> {
34 private final LoadingCache<A, D> declaredCache = CacheBuilder.newBuilder().weakValues()
35 .build(new CacheLoader<A, D>() {
37 public D load(final A key) {
38 return createEmptyDeclared(key);
41 private final LoadingCache<D, E> effectiveCache = CacheBuilder.newBuilder().weakValues()
42 .build(new CacheLoader<D, E>() {
44 public E load(final D key) throws ExecutionException {
45 return createEmptyEffective(key);
49 protected BaseInternedStatementSupport(final StatementDefinition publicDefinition) {
50 super(publicDefinition, CopyPolicy.CONTEXT_INDEPENDENT);
54 protected final D createEmptyDeclared(final StmtContext<A, D, ?> ctx) {
55 return declaredCache.getUnchecked(ctx.coerceStatementArgument());
58 protected abstract @NonNull D createEmptyDeclared(@NonNull A argument);
61 protected final E createEmptyEffective(final StmtContext<A, D, E> ctx, final D declared) {
62 return effectiveCache.getUnchecked(declared);
65 protected abstract @NonNull E createEmptyEffective(@NonNull D declared);
68 protected final D createDeclared(final StmtContext<A, D, ?> ctx,
69 final ImmutableList<? extends DeclaredStatement<?>> substatements) {
70 return createDeclared(ctx.coerceStatementArgument(), substatements);
73 protected abstract @NonNull D createDeclared(@NonNull A argument,
74 ImmutableList<? extends DeclaredStatement<?>> substatements);