2 * Copyright (c) 2013 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 com.google.common.base.Preconditions.checkArgument;
11 import static com.google.common.base.Preconditions.checkState;
13 import com.google.common.annotations.Beta;
14 import com.google.common.cache.CacheBuilder;
15 import com.google.common.cache.CacheLoader;
16 import com.google.common.cache.LoadingCache;
17 import com.google.common.collect.ImmutableSet;
18 import com.google.common.collect.ImmutableSet.Builder;
19 import com.google.common.util.concurrent.ListenableFuture;
20 import java.lang.reflect.Field;
21 import java.lang.reflect.InvocationTargetException;
22 import java.lang.reflect.Method;
23 import java.lang.reflect.Modifier;
24 import java.lang.reflect.ParameterizedType;
25 import java.lang.reflect.Type;
26 import java.util.Arrays;
27 import java.util.HashMap;
28 import java.util.HashSet;
29 import java.util.LinkedList;
30 import java.util.List;
32 import java.util.Optional;
33 import java.util.ServiceLoader;
35 import java.util.concurrent.TimeUnit;
36 import java.util.regex.Matcher;
37 import java.util.regex.Pattern;
38 import org.checkerframework.checker.regex.qual.Regex;
39 import org.eclipse.jdt.annotation.NonNull;
40 import org.opendaylight.mdsal.binding.spec.naming.BindingMapping;
41 import org.opendaylight.yangtools.util.ClassLoaderUtils;
42 import org.opendaylight.yangtools.yang.binding.Action;
43 import org.opendaylight.yangtools.yang.binding.Augmentable;
44 import org.opendaylight.yangtools.yang.binding.Augmentation;
45 import org.opendaylight.yangtools.yang.binding.BaseIdentity;
46 import org.opendaylight.yangtools.yang.binding.BindingContract;
47 import org.opendaylight.yangtools.yang.binding.ChildOf;
48 import org.opendaylight.yangtools.yang.binding.DataContainer;
49 import org.opendaylight.yangtools.yang.binding.DataObject;
50 import org.opendaylight.yangtools.yang.binding.Notification;
51 import org.opendaylight.yangtools.yang.binding.Rpc;
52 import org.opendaylight.yangtools.yang.binding.RpcService;
53 import org.opendaylight.yangtools.yang.binding.YangModelBindingProvider;
54 import org.opendaylight.yangtools.yang.binding.YangModuleInfo;
55 import org.opendaylight.yangtools.yang.common.QName;
56 import org.opendaylight.yangtools.yang.common.QNameModule;
57 import org.opendaylight.yangtools.yang.common.YangConstants;
58 import org.slf4j.Logger;
59 import org.slf4j.LoggerFactory;
61 public final class BindingReflections {
63 private static final long EXPIRATION_TIME = 60;
66 private static final String ROOT_PACKAGE_PATTERN_STRING =
67 "(org.opendaylight.yang.gen.v1.[a-z0-9_\\.]*\\.(?:rev[0-9][0-9][0-1][0-9][0-3][0-9]|norev))";
68 private static final Pattern ROOT_PACKAGE_PATTERN = Pattern.compile(ROOT_PACKAGE_PATTERN_STRING);
69 private static final Logger LOG = LoggerFactory.getLogger(BindingReflections.class);
71 private static final LoadingCache<Class<?>, Optional<QName>> CLASS_TO_QNAME = CacheBuilder.newBuilder()
73 .expireAfterAccess(EXPIRATION_TIME, TimeUnit.SECONDS)
74 .build(new ClassToQNameLoader());
76 private static final LoadingCache<ClassLoader, ImmutableSet<YangModuleInfo>> MODULE_INFO_CACHE =
77 CacheBuilder.newBuilder().weakKeys().weakValues().build(
78 new CacheLoader<ClassLoader, ImmutableSet<YangModuleInfo>>() {
80 public ImmutableSet<YangModuleInfo> load(final ClassLoader key) {
81 return loadModuleInfos(key);
85 private BindingReflections() {
90 * Find augmentation target class from concrete Augmentation class. This method uses first generic argument of
91 * implemented {@link Augmentation} interface.
94 * {@link Augmentation} subclass for which we want to determine
95 * augmentation target.
96 * @return Augmentation target - class which augmentation provides additional extensions.
98 public static Class<? extends Augmentable<?>> findAugmentationTarget(
99 final Class<? extends Augmentation<?>> augmentation) {
100 final Optional<Class<Augmentable<?>>> opt = ClassLoaderUtils.findFirstGenericArgument(augmentation,
102 return opt.orElse(null);
106 * Find data hierarchy parent from concrete Data class. This method uses first generic argument of implemented
107 * {@link ChildOf} interface.
110 * child class for which we want to find the parent class.
111 * @return Parent class, e.g. class of which the childClass is ChildOf.
113 public static Class<?> findHierarchicalParent(final Class<? extends ChildOf<?>> childClass) {
114 return ClassLoaderUtils.findFirstGenericArgument(childClass, ChildOf.class).orElse(null);
118 * Find data hierarchy parent from concrete Data class. This method is shorthand which gets DataObject class by
119 * invoking {@link DataObject#implementedInterface()} and uses {@link #findHierarchicalParent(Class)}.
122 * Child object for which the parent needs to be located.
123 * @return Parent class, or null if a parent is not found.
125 public static Class<?> findHierarchicalParent(final DataObject child) {
126 if (child instanceof ChildOf) {
127 return ClassLoaderUtils.findFirstGenericArgument(child.implementedInterface(), ChildOf.class).orElse(null);
133 * Returns a QName associated to supplied type.
135 * @param dataType Data type class
136 * @return QName associated to supplied dataType. If dataType is Augmentation method does not return canonical
137 * QName, but QName with correct namespace revision, but virtual local name, since augmentations do not
138 * have name. May return null if QName is not present.
140 public static QName findQName(final Class<?> dataType) {
141 return CLASS_TO_QNAME.getUnchecked(dataType).orElse(null);
145 * Checks if method is RPC invocation.
147 * @param possibleMethod
149 * @return true if method is RPC invocation, false otherwise.
151 public static boolean isRpcMethod(final Method possibleMethod) {
152 return possibleMethod != null && RpcService.class.isAssignableFrom(possibleMethod.getDeclaringClass())
153 && ListenableFuture.class.isAssignableFrom(possibleMethod.getReturnType())
154 // length <= 2: it seemed to be impossible to get correct RpcMethodInvoker because of
155 // resolveRpcInputClass() check.While RpcMethodInvoker counts with one argument for
156 // non input type and two arguments for input type, resolveRpcInputClass() counting
157 // with zero for non input and one for input type
158 && possibleMethod.getParameterCount() <= 2;
162 * Extracts Output class for RPC method.
164 * @param targetMethod
166 * @return Optional.empty() if result type could not be get, or return type is Void.
168 @SuppressWarnings("rawtypes")
169 public static Optional<Class<?>> resolveRpcOutputClass(final Method targetMethod) {
170 checkState(isRpcMethod(targetMethod), "Supplied method is not a RPC invocation method");
171 Type futureType = targetMethod.getGenericReturnType();
172 Type rpcResultType = ClassLoaderUtils.getFirstGenericParameter(futureType).orElse(null);
173 Type rpcResultArgument = ClassLoaderUtils.getFirstGenericParameter(rpcResultType).orElse(null);
174 if (rpcResultArgument instanceof Class cls && !Void.class.equals(rpcResultArgument)) {
175 return Optional.of(cls);
177 return Optional.empty();
181 * Extracts input class for RPC method.
183 * @param targetMethod
185 * @return Optional.empty() if RPC has no input, RPC input type otherwise.
187 @SuppressWarnings("rawtypes")
188 public static Optional<Class<? extends DataContainer>> resolveRpcInputClass(final Method targetMethod) {
189 for (Class clazz : targetMethod.getParameterTypes()) {
190 if (DataContainer.class.isAssignableFrom(clazz)) {
191 return Optional.of(clazz);
194 return Optional.empty();
197 public static @NonNull QName getQName(final BaseIdentity identity) {
198 return getContractQName(identity);
201 public static @NonNull QName getQName(final Rpc<?, ?> rpc) {
202 return getContractQName(rpc);
205 private static @NonNull QName getContractQName(final BindingContract<?> contract) {
206 return CLASS_TO_QNAME.getUnchecked(contract.implementedInterface())
207 .orElseThrow(() -> new IllegalStateException("Failed to resolve QName of " + contract));
211 * Returns root package name for supplied package.
214 * Package for which find model root package.
215 * @return Package of model root.
217 public static String getModelRootPackageName(final Package pkg) {
218 return getModelRootPackageName(pkg.getName());
222 * Returns root package name for supplied package name.
225 * Package for which find model root package.
226 * @return Package of model root.
228 public static String getModelRootPackageName(final String name) {
229 checkArgument(name != null, "Package name should not be null.");
230 checkArgument(name.startsWith(BindingMapping.PACKAGE_PREFIX), "Package name not starting with %s, is: %s",
231 BindingMapping.PACKAGE_PREFIX, name);
232 Matcher match = ROOT_PACKAGE_PATTERN.matcher(name);
233 checkArgument(match.find(), "Package name '%s' does not match required pattern '%s'", name,
234 ROOT_PACKAGE_PATTERN_STRING);
235 return match.group(0);
238 public static QNameModule getQNameModule(final Class<?> clz) {
239 if (DataContainer.class.isAssignableFrom(clz) || BaseIdentity.class.isAssignableFrom(clz)
240 || Action.class.isAssignableFrom(clz)) {
241 return findQName(clz).getModule();
244 return getModuleInfo(clz).getName().getModule();
248 * Returns instance of {@link YangModuleInfo} of declaring model for specific class.
250 * @param cls data object class
251 * @return Instance of {@link YangModuleInfo} associated with model, from which this class was derived.
253 public static @NonNull YangModuleInfo getModuleInfo(final Class<?> cls) {
254 final String packageName = getModelRootPackageName(cls.getPackage());
255 final String potentialClassName = getModuleInfoClassName(packageName);
256 final Class<?> moduleInfoClass;
258 moduleInfoClass = cls.getClassLoader().loadClass(potentialClassName);
259 } catch (ClassNotFoundException e) {
260 throw new IllegalStateException("Failed to load " + potentialClassName, e);
263 final Object infoInstance;
265 infoInstance = moduleInfoClass.getMethod("getInstance").invoke(null);
266 } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
267 throw new IllegalStateException("Failed to get instance of " + moduleInfoClass, e);
270 checkState(infoInstance instanceof YangModuleInfo, "Unexpected instance %s", infoInstance);
271 return (YangModuleInfo) infoInstance;
274 public static @NonNull String getModuleInfoClassName(final String packageName) {
275 return packageName + "." + BindingMapping.MODULE_INFO_CLASS_NAME;
279 * Check if supplied class is derived from YANG model.
283 * @return true if class is derived from YANG model.
285 public static boolean isBindingClass(final Class<?> cls) {
286 if (DataContainer.class.isAssignableFrom(cls) || Augmentation.class.isAssignableFrom(cls)) {
289 return cls.getName().startsWith(BindingMapping.PACKAGE_PREFIX);
293 * Checks if supplied method is callback for notifications.
295 * @param method method to check
296 * @return true if method is notification callback.
298 public static boolean isNotificationCallback(final Method method) {
299 checkArgument(method != null);
300 if (method.getName().startsWith("on") && method.getParameterCount() == 1) {
301 Class<?> potentialNotification = method.getParameterTypes()[0];
302 if (isNotification(potentialNotification)
303 && method.getName().equals("on" + potentialNotification.getSimpleName())) {
311 * Checks is supplied class is a {@link Notification}.
313 * @param potentialNotification class to examine
314 * @return True if the class represents a Notification.
316 public static boolean isNotification(final Class<?> potentialNotification) {
317 checkArgument(potentialNotification != null, "potentialNotification must not be null.");
318 return Notification.class.isAssignableFrom(potentialNotification);
322 * Loads {@link YangModuleInfo} infos available on current classloader. This method is shorthand for
323 * {@link #loadModuleInfos(ClassLoader)} with {@link Thread#getContextClassLoader()} for current thread.
325 * @return Set of {@link YangModuleInfo} available for current classloader.
327 public static @NonNull ImmutableSet<YangModuleInfo> loadModuleInfos() {
328 return loadModuleInfos(Thread.currentThread().getContextClassLoader());
332 * Loads {@link YangModuleInfo} infos available on supplied classloader.
335 * {@link YangModuleInfo} are discovered using {@link ServiceLoader} for {@link YangModelBindingProvider}.
336 * {@link YangModelBindingProvider} are simple classes which holds only pointers to actual instance
337 * {@link YangModuleInfo}.
340 * When {@link YangModuleInfo} is available, all dependencies are recursively collected into returning set by
341 * collecting results of {@link YangModuleInfo#getImportedModules()}.
344 * Consider using {@link #cacheModuleInfos(ClassLoader)} if the classloader is known to be immutable.
346 * @param loader Classloader for which {@link YangModuleInfo} should be retrieved.
347 * @return Set of {@link YangModuleInfo} available for supplied classloader.
349 public static @NonNull ImmutableSet<YangModuleInfo> loadModuleInfos(final ClassLoader loader) {
350 Builder<YangModuleInfo> moduleInfoSet = ImmutableSet.builder();
351 ServiceLoader<YangModelBindingProvider> serviceLoader = ServiceLoader.load(YangModelBindingProvider.class,
353 for (YangModelBindingProvider bindingProvider : serviceLoader) {
354 YangModuleInfo moduleInfo = bindingProvider.getModuleInfo();
355 checkState(moduleInfo != null, "Module Info for %s is not available.", bindingProvider.getClass());
356 collectYangModuleInfo(bindingProvider.getModuleInfo(), moduleInfoSet);
358 return moduleInfoSet.build();
362 * Loads {@link YangModuleInfo} instances available on supplied {@link ClassLoader}, assuming the set of available
363 * information does not change. Subsequent accesses may return cached values.
366 * {@link YangModuleInfo} are discovered using {@link ServiceLoader} for {@link YangModelBindingProvider}.
367 * {@link YangModelBindingProvider} are simple classes which holds only pointers to actual instance
368 * {@link YangModuleInfo}.
371 * When {@link YangModuleInfo} is available, all dependencies are recursively collected into returning set by
372 * collecting results of {@link YangModuleInfo#getImportedModules()}.
374 * @param loader Class loader for which {@link YangModuleInfo} should be retrieved.
375 * @return Set of {@link YangModuleInfo} available for supplied classloader.
378 public static @NonNull ImmutableSet<YangModuleInfo> cacheModuleInfos(final ClassLoader loader) {
379 return MODULE_INFO_CACHE.getUnchecked(loader);
382 private static void collectYangModuleInfo(final YangModuleInfo moduleInfo,
383 final Builder<YangModuleInfo> moduleInfoSet) {
384 moduleInfoSet.add(moduleInfo);
385 for (YangModuleInfo dependency : moduleInfo.getImportedModules()) {
386 collectYangModuleInfo(dependency, moduleInfoSet);
391 * Checks if supplied class represents RPC Input / RPC Output.
394 * Class to be checked
395 * @return true if class represents RPC Input or RPC Output class.
397 public static boolean isRpcType(final Class<? extends DataObject> targetType) {
398 return DataContainer.class.isAssignableFrom(targetType)
399 && !ChildOf.class.isAssignableFrom(targetType)
400 && !Notification.class.isAssignableFrom(targetType)
401 && (targetType.getName().endsWith("Input") || targetType.getName().endsWith("Output"));
405 * Scans supplied class and returns an iterable of all data children classes.
408 * YANG Modeled Entity derived from DataContainer
409 * @return Iterable of all data children, which have YANG modeled entity
411 @SuppressWarnings("unchecked")
412 public static Iterable<Class<? extends DataObject>> getChildrenClasses(final Class<? extends DataContainer> type) {
413 checkArgument(type != null, "Target type must not be null");
414 checkArgument(DataContainer.class.isAssignableFrom(type), "Supplied type must be derived from DataContainer");
415 List<Class<? extends DataObject>> ret = new LinkedList<>();
416 for (Method method : type.getMethods()) {
417 Optional<Class<? extends DataContainer>> entity = getYangModeledReturnType(method,
418 BindingMapping.GETTER_PREFIX);
419 if (entity.isPresent()) {
420 ret.add((Class<? extends DataObject>) entity.get());
427 * Scans supplied class and returns an iterable of all data children classes.
429 * @param type YANG Modeled Entity derived from DataContainer
430 * @return Iterable of all data children, which have YANG modeled entity
432 public static Map<Class<? extends DataContainer>, Method> getChildrenClassToMethod(final Class<?> type) {
433 return getChildClassToMethod(type, BindingMapping.GETTER_PREFIX);
437 public static Map<Class<? extends DataContainer>, Method> getChildrenClassToNonnullMethod(final Class<?> type) {
438 return getChildClassToMethod(type, BindingMapping.NONNULL_PREFIX);
441 private static Map<Class<? extends DataContainer>, Method> getChildClassToMethod(final Class<?> type,
442 final String prefix) {
443 checkArgument(type != null, "Target type must not be null");
444 checkArgument(DataContainer.class.isAssignableFrom(type), "Supplied type %s must be derived from DataContainer",
446 Map<Class<? extends DataContainer>, Method> ret = new HashMap<>();
447 for (Method method : type.getMethods()) {
448 Optional<Class<? extends DataContainer>> entity = getYangModeledReturnType(method, prefix);
449 if (entity.isPresent()) {
450 ret.put(entity.get(), method);
456 private static Optional<Class<? extends DataContainer>> getYangModeledReturnType(final Method method,
457 final String prefix) {
458 final String methodName = method.getName();
459 if ("getClass".equals(methodName) || !methodName.startsWith(prefix) || method.getParameterCount() > 0) {
460 return Optional.empty();
463 final Class<?> returnType = method.getReturnType();
464 if (DataContainer.class.isAssignableFrom(returnType)) {
465 return optionalDataContainer(returnType);
466 } else if (List.class.isAssignableFrom(returnType)) {
467 return getYangModeledReturnType(method, 0);
468 } else if (Map.class.isAssignableFrom(returnType)) {
469 return getYangModeledReturnType(method, 1);
471 return Optional.empty();
474 @SuppressWarnings("checkstyle:illegalCatch")
475 private static Optional<Class<? extends DataContainer>> getYangModeledReturnType(final Method method,
476 final int parameterOffset) {
478 return ClassLoaderUtils.callWithClassLoader(method.getDeclaringClass().getClassLoader(),
479 () -> genericParameter(method.getGenericReturnType(), parameterOffset)
480 .flatMap(result -> result instanceof Class ? optionalCast((Class<?>) result) : Optional.empty()));
481 } catch (Exception e) {
483 * It is safe to log this this exception on debug, since this
484 * method should not fail. Only failures are possible if the
487 LOG.debug("Unable to find YANG modeled return type for {}", method, e);
489 return Optional.empty();
492 private static Optional<Class<? extends DataContainer>> optionalCast(final Class<?> type) {
493 return DataContainer.class.isAssignableFrom(type) ? optionalDataContainer(type) : Optional.empty();
496 private static Optional<Class<? extends DataContainer>> optionalDataContainer(final Class<?> type) {
497 return Optional.of(type.asSubclass(DataContainer.class));
500 private static Optional<Type> genericParameter(final Type type, final int offset) {
501 if (type instanceof ParameterizedType parameterized) {
502 final Type[] parameters = parameterized.getActualTypeArguments();
503 if (parameters.length > offset) {
504 return Optional.of(parameters[offset]);
507 return Optional.empty();
510 private static class ClassToQNameLoader extends CacheLoader<Class<?>, Optional<QName>> {
513 public Optional<QName> load(@SuppressWarnings("NullableProblems") final Class<?> key) throws Exception {
514 return resolveQNameNoCache(key);
518 * Tries to resolve QName for supplied class. Looks up for static field with name from constant
519 * {@link BindingMapping#QNAME_STATIC_FIELD_NAME} and returns value if present. If field is not present uses
520 * {@link #computeQName(Class)} to compute QName for missing types.
522 private static Optional<QName> resolveQNameNoCache(final Class<?> key) {
526 field = key.getField(BindingMapping.QNAME_STATIC_FIELD_NAME);
527 } catch (NoSuchFieldException e) {
528 LOG.debug("{} does not have a {} field, falling back to computation", key,
529 BindingMapping.QNAME_STATIC_FIELD_NAME, e);
530 return Optional.of(computeQName(key));
533 final Object obj = field.get(null);
534 if (obj instanceof QName qname) {
535 return Optional.of(qname);
537 } catch (SecurityException | IllegalArgumentException | IllegalAccessException e) {
539 * It is safe to log this this exception on debug, since this method should not fail. Only failures are
540 * possible if the runtime / backing is inconsistent.
542 LOG.debug("Unexpected exception during extracting QName for {}", key, e);
544 return Optional.empty();
548 * Computes QName for supplied class. Namespace and revision are same as {@link YangModuleInfo} associated with
554 * <li>rpc input: local name is "input".
555 * <li>rpc output: local name is "output".
556 * <li>augmentation: local name is "module name".
560 * There is also fallback, if it is not possible to compute QName using following algorithm returns module
563 * @throws IllegalStateException If YangModuleInfo could not be resolved
564 * @throws IllegalArgumentException If supplied class was not derived from YANG model.
566 // FIXME: Extend this algorithm to also provide QName for YANG modeled simple types.
567 @SuppressWarnings({ "rawtypes", "unchecked" })
568 private static QName computeQName(final Class key) {
569 checkArgument(isBindingClass(key), "Supplied class %s is not derived from YANG.", key);
571 final QName module = getModuleInfo(key).getName();
572 if (Augmentation.class.isAssignableFrom(key)) {
574 } else if (isRpcType(key)) {
575 final String className = key.getSimpleName();
576 if (className.endsWith(BindingMapping.RPC_OUTPUT_SUFFIX)) {
577 return YangConstants.operationOutputQName(module.getModule()).intern();
580 return YangConstants.operationInputQName(module.getModule()).intern();
584 * Fallback for Binding types which do not have QNAME field
591 * Determines if two augmentation classes or case classes represents same
595 * Two augmentations or cases could be substituted only if and if:
597 * <li>Both implements same interfaces</li>
598 * <li>Both have same children</li>
599 * <li>If augmentations: Both have same augmentation target class. Target
600 * class was generated for data node in grouping.</li>
601 * <li>If cases: Both are from same choice. Choice class was generated for
602 * data node in grouping.</li>
606 * <b>Explanation:</b> Binding Specification reuses classes generated for
607 * groupings as part of normal data tree, this classes from grouping could
608 * be used at various locations and user may not be aware of it and may use
609 * incorrect case or augmentation in particular subtree (via copy
610 * constructors, etc).
613 * Class which is potential substitution
615 * Class which should be used at particular subtree
616 * @return true if and only if classes represents same data.
618 // FIXME: this really should live in BindingRuntimeTypes and should not be based on reflection. The only user is
619 // binding-dom-codec and the logic could easily be performed on GeneratedType instead. For a particular
620 // world this boils down to a matrix, which can be calculated either on-demand or when we create
621 // BindingRuntimeTypes. Achieving that will bring us one step closer to being able to have a pre-compiled
623 @SuppressWarnings({ "rawtypes", "unchecked" })
624 public static boolean isSubstitutionFor(final Class potential, final Class target) {
625 Set<Class> subImplemented = new HashSet<>(Arrays.asList(potential.getInterfaces()));
626 Set<Class> targetImplemented = new HashSet<>(Arrays.asList(target.getInterfaces()));
627 if (!subImplemented.equals(targetImplemented)) {
630 if (Augmentation.class.isAssignableFrom(potential)
631 && !BindingReflections.findAugmentationTarget(potential).equals(
632 BindingReflections.findAugmentationTarget(target))) {
635 for (Method potentialMethod : potential.getMethods()) {
636 if (Modifier.isStatic(potentialMethod.getModifiers())) {
637 // Skip any static methods, as we are not interested in those
642 Method targetMethod = target.getMethod(potentialMethod.getName(), potentialMethod.getParameterTypes());
643 if (!potentialMethod.getReturnType().equals(targetMethod.getReturnType())) {
646 } catch (NoSuchMethodException e) {
647 // Counterpart method is missing, so classes could not be substituted.
649 } catch (SecurityException e) {
650 throw new IllegalStateException("Could not compare methods", e);