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.AbstractStatementSupport;
21 import org.opendaylight.yangtools.yang.parser.spi.meta.EffectiveStmtCtx.Current;
22 import org.opendaylight.yangtools.yang.parser.spi.meta.StmtContext;
25 * A {@link AbstractStatementSupport} specialized for global interning. This base class is useful when the argument can
26 * be reasonably interned and it dominates the {@link EffectiveStatement} implementation. Typical examples include
27 * {@code position} and {@code value} statements, which typically do not have substatements and are based on simple
31 * Note: use of this base class implies context-independence.
34 public abstract class BaseInternedStatementSupport<A, D extends DeclaredStatement<A>,
35 E extends EffectiveStatement<A, D>> extends AbstractStatementSupport<A, D, E> {
36 private final LoadingCache<A, D> declaredCache = CacheBuilder.newBuilder().weakValues()
37 .build(new CacheLoader<A, D>() {
39 public D load(final A key) {
40 return createEmptyDeclared(key);
43 private final LoadingCache<D, E> effectiveCache = CacheBuilder.newBuilder().weakValues()
44 .build(new CacheLoader<D, E>() {
46 public E load(final D key) throws ExecutionException {
47 return createEmptyEffective(key);
51 protected BaseInternedStatementSupport(final StatementDefinition publicDefinition,
52 final StatementPolicy<A, D> policy) {
53 super(publicDefinition, policy);
57 protected final D createEmptyDeclared(final StmtContext<A, D, ?> ctx) {
58 return declaredCache.getUnchecked(ctx.getArgument());
61 protected abstract @NonNull D createEmptyDeclared(@NonNull A argument);
64 protected final E createEffective(final Current<A, D> stmt,
65 final ImmutableList<? extends EffectiveStatement<?, ?>> substatements) {
66 return substatements.isEmpty() ? effectiveCache.getUnchecked(stmt.declared())
67 : createEffective(stmt.declared(), substatements);
70 protected abstract @NonNull E createEffective(@NonNull D declared,
71 @NonNull ImmutableList<? extends EffectiveStatement<?, ?>> substatements);
73 protected abstract @NonNull E createEmptyEffective(@NonNull D declared);
76 protected final D createDeclared(final StmtContext<A, D, ?> ctx,
77 final ImmutableList<? extends DeclaredStatement<?>> substatements) {
78 return createDeclared(ctx.getArgument(), substatements);
81 protected abstract @NonNull D createDeclared(@NonNull A argument,
82 ImmutableList<? extends DeclaredStatement<?>> substatements);