2 * Copyright (c) 2019 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.mdsal.binding.dom.codec.impl;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.collect.ImmutableMap;
13 import java.lang.invoke.MethodHandles;
14 import java.lang.invoke.VarHandle;
16 import org.eclipse.jdt.annotation.NonNull;
17 import org.eclipse.jdt.annotation.Nullable;
18 import org.opendaylight.yangtools.yang.binding.Augmentable;
19 import org.opendaylight.yangtools.yang.binding.Augmentation;
20 import org.opendaylight.yangtools.yang.binding.DataObject;
21 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerNode;
24 * A base class for {@link DataObject}s which are also {@link Augmentable}, backed by {@link DataObjectCodecContext}.
25 * While this class is public, it not part of API surface and is an implementation detail. The only reason for it being
26 * public is that it needs to be accessible by code generated at runtime.
28 * @param <T> DataObject type
30 public abstract class AugmentableCodecDataObject<T extends DataObject & Augmentable<T>>
31 extends CodecDataObject<T> implements Augmentable<T> {
32 private static final VarHandle CACHED_AUGMENTATIONS;
36 CACHED_AUGMENTATIONS = MethodHandles.lookup().findVarHandle(AugmentableCodecDataObject.class,
37 "cachedAugmentations", ImmutableMap.class);
38 } catch (ReflectiveOperationException e) {
39 throw new ExceptionInInitializerError(e);
44 @SuppressWarnings("unused")
45 private volatile ImmutableMap<Class<? extends Augmentation<T>>, Augmentation<T>> cachedAugmentations;
47 protected AugmentableCodecDataObject(final AbstractDataObjectCodecContext<T, ?> context,
48 final DataContainerNode data) {
52 @SuppressWarnings("unchecked")
54 public final <A extends Augmentation<T>> @Nullable A augmentation(final Class<A> augmentationType) {
55 requireNonNull(augmentationType, "Supplied augmentation must not be null.");
57 final var aug = acquireAugmentations();
59 return (A) aug.get(augmentationType);
62 @SuppressWarnings("rawtypes")
63 final var augCtx = (AugmentationCodecContext<A>) codecContext().streamChild((Class) augmentationType);
64 // Due to binding specification not representing grouping instantiations we can end up having the same
65 // augmentation applied to a grouping multiple times. While these augmentations have the same shape, they are
66 // still represented by distinct binding classes and therefore we need to make sure the result matches
67 // the augmentation the user is requesting -- otherwise a strict receiver would end up with a cryptic
68 // ClassCastException.
69 if (augCtx != null && augmentationType.isAssignableFrom(augCtx.getBindingClass())) {
70 final var augObj = augCtx.filterFrom(codecData());
79 public final ImmutableMap<Class<? extends Augmentation<T>>, Augmentation<T>> augmentations() {
80 final var local = acquireAugmentations();
81 return local != null ? local : loadAugmentations();
84 private ImmutableMap<Class<? extends Augmentation<T>>, Augmentation<T>> acquireAugmentations() {
85 return (ImmutableMap<Class<? extends Augmentation<T>>, Augmentation<T>>) CACHED_AUGMENTATIONS.getAcquire(this);
88 @SuppressWarnings("unchecked")
89 private @NonNull ImmutableMap<Class<? extends Augmentation<T>>, Augmentation<T>> loadAugmentations() {
90 @SuppressWarnings("rawtypes")
91 final Map extracted = codecContext().getAllAugmentationsFrom(codecData());
92 final var ret = ImmutableMap.<Class<? extends Augmentation<T>>, Augmentation<T>>copyOf(extracted);
93 final Object witness = CACHED_AUGMENTATIONS.compareAndExchangeRelease(this, null, ret);
94 return witness == null ? ret : (ImmutableMap<Class<? extends Augmentation<T>>, Augmentation<T>>) witness;