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.controller.md.sal.binding.impl;
10 import com.google.common.cache.CacheBuilder;
11 import com.google.common.cache.CacheLoader;
12 import com.google.common.cache.LoadingCache;
13 import java.lang.reflect.Method;
14 import org.eclipse.jdt.annotation.NonNull;
15 import org.eclipse.jdt.annotation.Nullable;
16 import org.opendaylight.yangtools.yang.binding.DataObject;
17 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
18 import org.opendaylight.yangtools.yang.binding.annotations.RoutingContext;
19 import org.slf4j.Logger;
20 import org.slf4j.LoggerFactory;
22 abstract class ContextReferenceExtractor {
23 private static final Logger LOG = LoggerFactory.getLogger(ContextReferenceExtractor.class);
24 private static final ContextReferenceExtractor NULL_EXTRACTOR = new ContextReferenceExtractor() {
27 InstanceIdentifier<?> extract(final DataObject obj) {
32 private static final LoadingCache<Class<?>, ContextReferenceExtractor> EXTRACTORS = CacheBuilder.newBuilder()
33 .weakKeys().build(new CacheLoader<Class<?>, ContextReferenceExtractor>() {
36 public ContextReferenceExtractor load(final Class<?> key) {
42 private static final String GET_VALUE_NAME = "getValue";
44 static ContextReferenceExtractor from(final Class<?> obj) {
45 return EXTRACTORS.getUnchecked(obj);
49 * Extract context-reference (Instance Identifier) from
52 * @param obj DataObject from which context reference should be extracted.
54 * @return Instance Identifier representing context reference or null, if data object does not contain
57 abstract @Nullable InstanceIdentifier<?> extract(DataObject obj);
59 private static @NonNull ContextReferenceExtractor create(final Class<?> key) {
60 final Method contextGetter = getContextGetter(key);
61 if (contextGetter == null) {
62 return NULL_EXTRACTOR;
64 final Class<?> returnType = contextGetter.getReturnType();
66 if (InstanceIdentifier.class.isAssignableFrom(returnType)) {
67 return DirectGetterRouteContextExtractor.create(contextGetter);
69 final Method getValueMethod = findGetValueMethod(returnType,InstanceIdentifier.class);
70 if (getValueMethod != null) {
71 return GetValueRouteContextExtractor.create(contextGetter, getValueMethod);
73 LOG.warn("Class {} can not be used to determine context, falling back to NULL_EXTRACTOR.",returnType);
75 } catch (final IllegalAccessException e) {
76 LOG.warn("Class {} does not conform to Binding Specification v1. Falling back to NULL_EXTRACTOR", e);
78 return NULL_EXTRACTOR;
81 private static @Nullable Method findGetValueMethod(final Class<?> type, final Class<?> returnType) {
83 final Method method = type.getMethod(GET_VALUE_NAME);
84 if (returnType.equals(method.getReturnType())) {
87 } catch (final NoSuchMethodException e) {
88 LOG.warn("Value class {} does not comform to Binding Specification v1.", type, e);
93 private static Method getContextGetter(final Class<?> key) {
94 for (final Method method : key.getMethods()) {
95 if (method.getAnnotation(RoutingContext.class) != null) {