2 * Copyright (c) 2014 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.mdsal.binding.spec.reflect;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.cache.CacheBuilder;
13 import com.google.common.cache.CacheLoader;
14 import com.google.common.cache.LoadingCache;
15 import java.lang.invoke.MethodHandle;
16 import java.lang.invoke.MethodHandles;
17 import java.lang.invoke.MethodHandles.Lookup;
18 import java.lang.invoke.MethodType;
19 import java.lang.reflect.Field;
20 import java.util.Collections;
22 import org.opendaylight.mdsal.binding.spec.naming.BindingMapping;
23 import org.opendaylight.yangtools.yang.binding.Augmentation;
24 import org.opendaylight.yangtools.yang.binding.AugmentationHolder;
25 import org.slf4j.Logger;
26 import org.slf4j.LoggerFactory;
28 abstract class AugmentationFieldGetter {
30 private static final Logger LOG = LoggerFactory.getLogger(AugmentationFieldGetter.class);
32 private static final AugmentationFieldGetter DUMMY = new AugmentationFieldGetter() {
34 protected Map<Class<? extends Augmentation<?>>, Augmentation<?>> getAugmentations(final Object input) {
35 return Collections.emptyMap();
39 private static final AugmentationFieldGetter AUGMENTATION_HOLDER_GETTER = new AugmentationFieldGetter() {
41 @SuppressWarnings({"unchecked", "rawtypes"})
42 protected Map<Class<? extends Augmentation<?>>, Augmentation<?>> getAugmentations(final Object input) {
43 return (Map) ((AugmentationHolder<?>) input).augmentations();
47 private static final LoadingCache<Class<?>, AugmentationFieldGetter> AUGMENTATION_GETTERS =
48 CacheBuilder.newBuilder().weakKeys().build(new AugmentationGetterLoader());
51 * Retrieves augmentations from supplied object.
53 * @param input Input Data object, from which augmentations should be extracted
54 * @return Map of Augmentation class to augmentation
56 protected abstract Map<Class<? extends Augmentation<?>>, Augmentation<?>> getAugmentations(Object input);
58 public static AugmentationFieldGetter getGetter(final Class<? extends Object> clz) {
59 if (AugmentationHolder.class.isAssignableFrom(clz)) {
60 return AUGMENTATION_HOLDER_GETTER;
62 return AUGMENTATION_GETTERS.getUnchecked(clz);
65 private static final class AugmentationGetterLoader extends CacheLoader<Class<?>, AugmentationFieldGetter> {
66 private static final MethodType GETTER_TYPE = MethodType.methodType(Map.class, Object.class);
67 private static final Lookup LOOKUP = MethodHandles.lookup();
70 public AugmentationFieldGetter load(final Class<?> key) throws IllegalAccessException {
73 field = key.getDeclaredField(BindingMapping.AUGMENTATION_FIELD);
74 field.setAccessible(true);
75 } catch (NoSuchFieldException | SecurityException e) {
76 LOG.warn("Failed to acquire augmentation field {}, ignoring augmentations in class {}",
77 BindingMapping.AUGMENTATION_FIELD, key, e);
80 if (!Map.class.isAssignableFrom(field.getType())) {
81 LOG.warn("Class {} field {} is not a Map, ignoring augmentations", key,
82 BindingMapping.AUGMENTATION_FIELD);
86 return new ReflectionAugmentationFieldGetter(LOOKUP.unreflectGetter(field).asType(GETTER_TYPE));
90 private static final class ReflectionAugmentationFieldGetter extends AugmentationFieldGetter {
91 private final MethodHandle fieldGetter;
93 ReflectionAugmentationFieldGetter(final MethodHandle mh) {
94 this.fieldGetter = requireNonNull(mh);
98 @SuppressWarnings("checkstyle:illegalCatch")
99 protected Map<Class<? extends Augmentation<?>>, Augmentation<?>> getAugmentations(final Object input) {
101 return (Map<Class<? extends Augmentation<?>>, Augmentation<?>>) fieldGetter.invokeExact(input);
102 } catch (Throwable e) {
103 throw new IllegalStateException("Failed to access augmentation field on " + input, e);