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 * Returns a QName associated to supplied type.
108 * @param dataType Data type class
109 * @return QName associated to supplied dataType. If dataType is Augmentation method does not return canonical
110 * QName, but QName with correct namespace revision, but virtual local name, since augmentations do not
111 * have name. May return null if QName is not present.
113 public static QName findQName(final Class<?> dataType) {
114 return CLASS_TO_QNAME.getUnchecked(dataType).orElse(null);
118 * Checks if method is RPC invocation.
120 * @param possibleMethod
122 * @return true if method is RPC invocation, false otherwise.
124 public static boolean isRpcMethod(final Method possibleMethod) {
125 return possibleMethod != null && RpcService.class.isAssignableFrom(possibleMethod.getDeclaringClass())
126 && ListenableFuture.class.isAssignableFrom(possibleMethod.getReturnType())
127 // length <= 2: it seemed to be impossible to get correct RpcMethodInvoker because of
128 // resolveRpcInputClass() check.While RpcMethodInvoker counts with one argument for
129 // non input type and two arguments for input type, resolveRpcInputClass() counting
130 // with zero for non input and one for input type
131 && possibleMethod.getParameterCount() <= 2;
135 * Extracts Output class for RPC method.
137 * @param targetMethod
139 * @return Optional.empty() if result type could not be get, or return type is Void.
141 @SuppressWarnings("rawtypes")
142 public static Optional<Class<?>> resolveRpcOutputClass(final Method targetMethod) {
143 checkState(isRpcMethod(targetMethod), "Supplied method is not a RPC invocation method");
144 Type futureType = targetMethod.getGenericReturnType();
145 Type rpcResultType = ClassLoaderUtils.getFirstGenericParameter(futureType).orElse(null);
146 Type rpcResultArgument = ClassLoaderUtils.getFirstGenericParameter(rpcResultType).orElse(null);
147 if (rpcResultArgument instanceof Class cls && !Void.class.equals(rpcResultArgument)) {
148 return Optional.of(cls);
150 return Optional.empty();
154 * Extracts input class for RPC method.
156 * @param targetMethod
158 * @return Optional.empty() if RPC has no input, RPC input type otherwise.
160 @SuppressWarnings("rawtypes")
161 public static Optional<Class<? extends DataContainer>> resolveRpcInputClass(final Method targetMethod) {
162 for (Class clazz : targetMethod.getParameterTypes()) {
163 if (DataContainer.class.isAssignableFrom(clazz)) {
164 return Optional.of(clazz);
167 return Optional.empty();
170 public static @NonNull QName getQName(final BaseIdentity identity) {
171 return getContractQName(identity);
174 public static @NonNull QName getQName(final Rpc<?, ?> rpc) {
175 return getContractQName(rpc);
178 private static @NonNull QName getContractQName(final BindingContract<?> contract) {
179 return CLASS_TO_QNAME.getUnchecked(contract.implementedInterface())
180 .orElseThrow(() -> new IllegalStateException("Failed to resolve QName of " + contract));
184 * Returns root package name for supplied package.
187 * Package for which find model root package.
188 * @return Package of model root.
190 public static String getModelRootPackageName(final Package pkg) {
191 return getModelRootPackageName(pkg.getName());
195 * Returns root package name for supplied package name.
198 * Package for which find model root package.
199 * @return Package of model root.
201 public static String getModelRootPackageName(final String name) {
202 checkArgument(name != null, "Package name should not be null.");
203 checkArgument(name.startsWith(BindingMapping.PACKAGE_PREFIX), "Package name not starting with %s, is: %s",
204 BindingMapping.PACKAGE_PREFIX, name);
205 Matcher match = ROOT_PACKAGE_PATTERN.matcher(name);
206 checkArgument(match.find(), "Package name '%s' does not match required pattern '%s'", name,
207 ROOT_PACKAGE_PATTERN_STRING);
208 return match.group(0);
211 public static QNameModule getQNameModule(final Class<?> clz) {
212 if (DataContainer.class.isAssignableFrom(clz) || BaseIdentity.class.isAssignableFrom(clz)
213 || Action.class.isAssignableFrom(clz)) {
214 return findQName(clz).getModule();
217 return getModuleInfo(clz).getName().getModule();
221 * Returns instance of {@link YangModuleInfo} of declaring model for specific class.
223 * @param cls data object class
224 * @return Instance of {@link YangModuleInfo} associated with model, from which this class was derived.
226 public static @NonNull YangModuleInfo getModuleInfo(final Class<?> cls) {
227 final String packageName = getModelRootPackageName(cls.getPackage());
228 final String potentialClassName = getModuleInfoClassName(packageName);
229 final Class<?> moduleInfoClass;
231 moduleInfoClass = cls.getClassLoader().loadClass(potentialClassName);
232 } catch (ClassNotFoundException e) {
233 throw new IllegalStateException("Failed to load " + potentialClassName, e);
236 final Object infoInstance;
238 infoInstance = moduleInfoClass.getMethod("getInstance").invoke(null);
239 } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
240 throw new IllegalStateException("Failed to get instance of " + moduleInfoClass, e);
243 checkState(infoInstance instanceof YangModuleInfo, "Unexpected instance %s", infoInstance);
244 return (YangModuleInfo) infoInstance;
247 public static @NonNull String getModuleInfoClassName(final String packageName) {
248 return packageName + "." + BindingMapping.MODULE_INFO_CLASS_NAME;
252 * Check if supplied class is derived from YANG model.
256 * @return true if class is derived from YANG model.
258 public static boolean isBindingClass(final Class<?> cls) {
259 if (DataContainer.class.isAssignableFrom(cls) || Augmentation.class.isAssignableFrom(cls)) {
262 return cls.getName().startsWith(BindingMapping.PACKAGE_PREFIX);
266 * Checks if supplied method is callback for notifications.
268 * @param method method to check
269 * @return true if method is notification callback.
271 public static boolean isNotificationCallback(final Method method) {
272 checkArgument(method != null);
273 if (method.getName().startsWith("on") && method.getParameterCount() == 1) {
274 Class<?> potentialNotification = method.getParameterTypes()[0];
275 if (isNotification(potentialNotification)
276 && method.getName().equals("on" + potentialNotification.getSimpleName())) {
284 * Checks is supplied class is a {@link Notification}.
286 * @param potentialNotification class to examine
287 * @return True if the class represents a Notification.
289 public static boolean isNotification(final Class<?> potentialNotification) {
290 checkArgument(potentialNotification != null, "potentialNotification must not be null.");
291 return Notification.class.isAssignableFrom(potentialNotification);
295 * Loads {@link YangModuleInfo} infos available on current classloader. This method is shorthand for
296 * {@link #loadModuleInfos(ClassLoader)} with {@link Thread#getContextClassLoader()} for current thread.
298 * @return Set of {@link YangModuleInfo} available for current classloader.
300 public static @NonNull ImmutableSet<YangModuleInfo> loadModuleInfos() {
301 return loadModuleInfos(Thread.currentThread().getContextClassLoader());
305 * Loads {@link YangModuleInfo} infos available on supplied classloader.
308 * {@link YangModuleInfo} are discovered using {@link ServiceLoader} for {@link YangModelBindingProvider}.
309 * {@link YangModelBindingProvider} are simple classes which holds only pointers to actual instance
310 * {@link YangModuleInfo}.
313 * When {@link YangModuleInfo} is available, all dependencies are recursively collected into returning set by
314 * collecting results of {@link YangModuleInfo#getImportedModules()}.
317 * Consider using {@link #cacheModuleInfos(ClassLoader)} if the classloader is known to be immutable.
319 * @param loader Classloader for which {@link YangModuleInfo} should be retrieved.
320 * @return Set of {@link YangModuleInfo} available for supplied classloader.
322 public static @NonNull ImmutableSet<YangModuleInfo> loadModuleInfos(final ClassLoader loader) {
323 Builder<YangModuleInfo> moduleInfoSet = ImmutableSet.builder();
324 ServiceLoader<YangModelBindingProvider> serviceLoader = ServiceLoader.load(YangModelBindingProvider.class,
326 for (YangModelBindingProvider bindingProvider : serviceLoader) {
327 YangModuleInfo moduleInfo = bindingProvider.getModuleInfo();
328 checkState(moduleInfo != null, "Module Info for %s is not available.", bindingProvider.getClass());
329 collectYangModuleInfo(bindingProvider.getModuleInfo(), moduleInfoSet);
331 return moduleInfoSet.build();
335 * Loads {@link YangModuleInfo} instances available on supplied {@link ClassLoader}, assuming the set of available
336 * information does not change. Subsequent accesses may return cached values.
339 * {@link YangModuleInfo} are discovered using {@link ServiceLoader} for {@link YangModelBindingProvider}.
340 * {@link YangModelBindingProvider} are simple classes which holds only pointers to actual instance
341 * {@link YangModuleInfo}.
344 * When {@link YangModuleInfo} is available, all dependencies are recursively collected into returning set by
345 * collecting results of {@link YangModuleInfo#getImportedModules()}.
347 * @param loader Class loader for which {@link YangModuleInfo} should be retrieved.
348 * @return Set of {@link YangModuleInfo} available for supplied classloader.
351 public static @NonNull ImmutableSet<YangModuleInfo> cacheModuleInfos(final ClassLoader loader) {
352 return MODULE_INFO_CACHE.getUnchecked(loader);
355 private static void collectYangModuleInfo(final YangModuleInfo moduleInfo,
356 final Builder<YangModuleInfo> moduleInfoSet) {
357 moduleInfoSet.add(moduleInfo);
358 for (YangModuleInfo dependency : moduleInfo.getImportedModules()) {
359 collectYangModuleInfo(dependency, moduleInfoSet);
364 * Checks if supplied class represents RPC Input / RPC Output.
367 * Class to be checked
368 * @return true if class represents RPC Input or RPC Output class.
370 public static boolean isRpcType(final Class<? extends DataObject> targetType) {
371 return DataContainer.class.isAssignableFrom(targetType)
372 && !ChildOf.class.isAssignableFrom(targetType)
373 && !Notification.class.isAssignableFrom(targetType)
374 && (targetType.getName().endsWith("Input") || targetType.getName().endsWith("Output"));
378 * Scans supplied class and returns an iterable of all data children classes.
381 * YANG Modeled Entity derived from DataContainer
382 * @return Iterable of all data children, which have YANG modeled entity
384 @SuppressWarnings("unchecked")
385 public static Iterable<Class<? extends DataObject>> getChildrenClasses(final Class<? extends DataContainer> type) {
386 checkArgument(type != null, "Target type must not be null");
387 checkArgument(DataContainer.class.isAssignableFrom(type), "Supplied type must be derived from DataContainer");
388 List<Class<? extends DataObject>> ret = new LinkedList<>();
389 for (Method method : type.getMethods()) {
390 Optional<Class<? extends DataContainer>> entity = getYangModeledReturnType(method,
391 BindingMapping.GETTER_PREFIX);
392 if (entity.isPresent()) {
393 ret.add((Class<? extends DataObject>) entity.get());
400 * Scans supplied class and returns an iterable of all data children classes.
402 * @param type YANG Modeled Entity derived from DataContainer
403 * @return Iterable of all data children, which have YANG modeled entity
405 public static Map<Class<? extends DataContainer>, Method> getChildrenClassToMethod(final Class<?> type) {
406 return getChildClassToMethod(type, BindingMapping.GETTER_PREFIX);
410 public static Map<Class<? extends DataContainer>, Method> getChildrenClassToNonnullMethod(final Class<?> type) {
411 return getChildClassToMethod(type, BindingMapping.NONNULL_PREFIX);
414 private static Map<Class<? extends DataContainer>, Method> getChildClassToMethod(final Class<?> type,
415 final String prefix) {
416 checkArgument(type != null, "Target type must not be null");
417 checkArgument(DataContainer.class.isAssignableFrom(type), "Supplied type %s must be derived from DataContainer",
419 Map<Class<? extends DataContainer>, Method> ret = new HashMap<>();
420 for (Method method : type.getMethods()) {
421 Optional<Class<? extends DataContainer>> entity = getYangModeledReturnType(method, prefix);
422 if (entity.isPresent()) {
423 ret.put(entity.get(), method);
429 private static Optional<Class<? extends DataContainer>> getYangModeledReturnType(final Method method,
430 final String prefix) {
431 final String methodName = method.getName();
432 if ("getClass".equals(methodName) || !methodName.startsWith(prefix) || method.getParameterCount() > 0) {
433 return Optional.empty();
436 final Class<?> returnType = method.getReturnType();
437 if (DataContainer.class.isAssignableFrom(returnType)) {
438 return optionalDataContainer(returnType);
439 } else if (List.class.isAssignableFrom(returnType)) {
440 return getYangModeledReturnType(method, 0);
441 } else if (Map.class.isAssignableFrom(returnType)) {
442 return getYangModeledReturnType(method, 1);
444 return Optional.empty();
447 @SuppressWarnings("checkstyle:illegalCatch")
448 private static Optional<Class<? extends DataContainer>> getYangModeledReturnType(final Method method,
449 final int parameterOffset) {
451 return ClassLoaderUtils.callWithClassLoader(method.getDeclaringClass().getClassLoader(),
452 () -> genericParameter(method.getGenericReturnType(), parameterOffset)
453 .flatMap(result -> result instanceof Class ? optionalCast((Class<?>) result) : Optional.empty()));
454 } catch (Exception e) {
456 * It is safe to log this this exception on debug, since this
457 * method should not fail. Only failures are possible if the
460 LOG.debug("Unable to find YANG modeled return type for {}", method, e);
462 return Optional.empty();
465 private static Optional<Class<? extends DataContainer>> optionalCast(final Class<?> type) {
466 return DataContainer.class.isAssignableFrom(type) ? optionalDataContainer(type) : Optional.empty();
469 private static Optional<Class<? extends DataContainer>> optionalDataContainer(final Class<?> type) {
470 return Optional.of(type.asSubclass(DataContainer.class));
473 private static Optional<Type> genericParameter(final Type type, final int offset) {
474 if (type instanceof ParameterizedType parameterized) {
475 final Type[] parameters = parameterized.getActualTypeArguments();
476 if (parameters.length > offset) {
477 return Optional.of(parameters[offset]);
480 return Optional.empty();
483 private static class ClassToQNameLoader extends CacheLoader<Class<?>, Optional<QName>> {
486 public Optional<QName> load(@SuppressWarnings("NullableProblems") final Class<?> key) throws Exception {
487 return resolveQNameNoCache(key);
491 * Tries to resolve QName for supplied class. Looks up for static field with name from constant
492 * {@link BindingMapping#QNAME_STATIC_FIELD_NAME} and returns value if present. If field is not present uses
493 * {@link #computeQName(Class)} to compute QName for missing types.
495 private static Optional<QName> resolveQNameNoCache(final Class<?> key) {
499 field = key.getField(BindingMapping.QNAME_STATIC_FIELD_NAME);
500 } catch (NoSuchFieldException e) {
501 LOG.debug("{} does not have a {} field, falling back to computation", key,
502 BindingMapping.QNAME_STATIC_FIELD_NAME, e);
503 return Optional.of(computeQName(key));
506 final Object obj = field.get(null);
507 if (obj instanceof QName qname) {
508 return Optional.of(qname);
510 } catch (SecurityException | IllegalArgumentException | IllegalAccessException e) {
512 * It is safe to log this this exception on debug, since this method should not fail. Only failures are
513 * possible if the runtime / backing is inconsistent.
515 LOG.debug("Unexpected exception during extracting QName for {}", key, e);
517 return Optional.empty();
521 * Computes QName for supplied class. Namespace and revision are same as {@link YangModuleInfo} associated with
527 * <li>rpc input: local name is "input".
528 * <li>rpc output: local name is "output".
529 * <li>augmentation: local name is "module name".
533 * There is also fallback, if it is not possible to compute QName using following algorithm returns module
536 * @throws IllegalStateException If YangModuleInfo could not be resolved
537 * @throws IllegalArgumentException If supplied class was not derived from YANG model.
539 // FIXME: Extend this algorithm to also provide QName for YANG modeled simple types.
540 @SuppressWarnings({ "rawtypes", "unchecked" })
541 private static QName computeQName(final Class key) {
542 checkArgument(isBindingClass(key), "Supplied class %s is not derived from YANG.", key);
544 final QName module = getModuleInfo(key).getName();
545 if (Augmentation.class.isAssignableFrom(key)) {
547 } else if (isRpcType(key)) {
548 final String className = key.getSimpleName();
549 if (className.endsWith(BindingMapping.RPC_OUTPUT_SUFFIX)) {
550 return YangConstants.operationOutputQName(module.getModule()).intern();
553 return YangConstants.operationInputQName(module.getModule()).intern();
557 * Fallback for Binding types which do not have QNAME field
564 * Determines if two augmentation classes or case classes represents same
568 * Two augmentations or cases could be substituted only if and if:
570 * <li>Both implements same interfaces</li>
571 * <li>Both have same children</li>
572 * <li>If augmentations: Both have same augmentation target class. Target
573 * class was generated for data node in grouping.</li>
574 * <li>If cases: Both are from same choice. Choice class was generated for
575 * data node in grouping.</li>
579 * <b>Explanation:</b> Binding Specification reuses classes generated for
580 * groupings as part of normal data tree, this classes from grouping could
581 * be used at various locations and user may not be aware of it and may use
582 * incorrect case or augmentation in particular subtree (via copy
583 * constructors, etc).
586 * Class which is potential substitution
588 * Class which should be used at particular subtree
589 * @return true if and only if classes represents same data.
591 // FIXME: this really should live in BindingRuntimeTypes and should not be based on reflection. The only user is
592 // binding-dom-codec and the logic could easily be performed on GeneratedType instead. For a particular
593 // world this boils down to a matrix, which can be calculated either on-demand or when we create
594 // BindingRuntimeTypes. Achieving that will bring us one step closer to being able to have a pre-compiled
596 @SuppressWarnings({ "rawtypes", "unchecked" })
597 public static boolean isSubstitutionFor(final Class potential, final Class target) {
598 Set<Class> subImplemented = new HashSet<>(Arrays.asList(potential.getInterfaces()));
599 Set<Class> targetImplemented = new HashSet<>(Arrays.asList(target.getInterfaces()));
600 if (!subImplemented.equals(targetImplemented)) {
603 if (Augmentation.class.isAssignableFrom(potential)
604 && !BindingReflections.findAugmentationTarget(potential).equals(
605 BindingReflections.findAugmentationTarget(target))) {
608 for (Method potentialMethod : potential.getMethods()) {
609 if (Modifier.isStatic(potentialMethod.getModifiers())) {
610 // Skip any static methods, as we are not interested in those
615 Method targetMethod = target.getMethod(potentialMethod.getName(), potentialMethod.getParameterTypes());
616 if (!potentialMethod.getReturnType().equals(targetMethod.getReturnType())) {
619 } catch (NoSuchMethodException e) {
620 // Counterpart method is missing, so classes could not be substituted.
622 } catch (SecurityException e) {
623 throw new IllegalStateException("Could not compare methods", e);