2 * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the terms of the Eclipse
5 * Public License v1.0 which accompanies this distribution, and is available at
6 * 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 javax.annotation.Nonnull;
15 import javax.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;
23 abstract class ContextReferenceExtractor {
25 private static final Logger LOG = LoggerFactory.getLogger(ContextReferenceExtractor.class);
26 private static final ContextReferenceExtractor NULL_EXTRACTOR = new ContextReferenceExtractor() {
29 InstanceIdentifier<?> extract(final DataObject obj) {
35 private static final LoadingCache<Class<?>, ContextReferenceExtractor> EXTRACTORS = CacheBuilder.newBuilder()
36 .weakKeys().build(new CacheLoader<Class<?>, ContextReferenceExtractor>() {
39 public ContextReferenceExtractor load(final Class<?> key) throws Exception {
45 private static final String GET_VALUE_NAME = "getValue";
47 static ContextReferenceExtractor from(final Class<?> obj) {
48 return EXTRACTORS.getUnchecked(obj);
52 * Extract context-reference (Instance Identifier) from
55 * @param obj DataObject from which context reference
56 * should be extracted.
58 * @return Instance Identifier representing context reference
59 * or null, if data object does not contain context reference.
61 abstract @Nullable InstanceIdentifier<?> extract(DataObject obj);
63 private static @Nonnull ContextReferenceExtractor create(final Class<?> key) {
64 final Method contextGetter = getContextGetter(key);
65 if (contextGetter == null) {
66 return NULL_EXTRACTOR;
68 final Class<?> returnType = contextGetter.getReturnType();
70 if (InstanceIdentifier.class.isAssignableFrom(returnType)) {
71 return DirectGetterRouteContextExtractor.create(contextGetter);
73 final Method getValueMethod = findGetValueMethod(returnType,InstanceIdentifier.class);
74 if (getValueMethod != null) {
75 return GetValueRouteContextExtractor.create(contextGetter, getValueMethod);
77 LOG.warn("Class {} can not be used to determine context, falling back to NULL_EXTRACTOR.",returnType);
79 } catch (final IllegalAccessException e) {
80 LOG.warn("Class {} does not conform to Binding Specification v1. Falling back to NULL_EXTRACTOR", e);
82 return NULL_EXTRACTOR;
85 private static @Nullable Method findGetValueMethod(final Class<?> type, final Class<?> returnType) {
87 final Method method = type.getMethod(GET_VALUE_NAME);
88 if(returnType.equals(method.getReturnType())) {
91 } catch (final NoSuchMethodException e) {
92 LOG.warn("Value class {} does not comform to Binding Specification v1.", type, e);
97 private static Method getContextGetter(final Class<?> key) {
98 for (final Method method : key.getMethods()) {
99 if (method.getAnnotation(RoutingContext.class) != null) {