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.Method;
22 import java.lang.reflect.Type;
23 import java.util.Arrays;
24 import java.util.HashMap;
25 import java.util.HashSet;
26 import java.util.LinkedList;
27 import java.util.List;
29 import java.util.Optional;
30 import java.util.ServiceLoader;
32 import java.util.concurrent.TimeUnit;
33 import java.util.regex.Matcher;
34 import java.util.regex.Pattern;
35 import javax.annotation.RegEx;
36 import org.opendaylight.mdsal.binding.spec.naming.BindingMapping;
37 import org.opendaylight.yangtools.util.ClassLoaderUtils;
38 import org.opendaylight.yangtools.yang.binding.Action;
39 import org.opendaylight.yangtools.yang.binding.Augmentable;
40 import org.opendaylight.yangtools.yang.binding.Augmentation;
41 import org.opendaylight.yangtools.yang.binding.AugmentationHolder;
42 import org.opendaylight.yangtools.yang.binding.BaseIdentity;
43 import org.opendaylight.yangtools.yang.binding.ChildOf;
44 import org.opendaylight.yangtools.yang.binding.DataContainer;
45 import org.opendaylight.yangtools.yang.binding.DataObject;
46 import org.opendaylight.yangtools.yang.binding.Notification;
47 import org.opendaylight.yangtools.yang.binding.RpcService;
48 import org.opendaylight.yangtools.yang.binding.YangModelBindingProvider;
49 import org.opendaylight.yangtools.yang.binding.YangModuleInfo;
50 import org.opendaylight.yangtools.yang.common.QName;
51 import org.opendaylight.yangtools.yang.common.QNameModule;
52 import org.opendaylight.yangtools.yang.common.YangConstants;
53 import org.slf4j.Logger;
54 import org.slf4j.LoggerFactory;
56 public final class BindingReflections {
58 private static final long EXPIRATION_TIME = 60;
61 private static final String ROOT_PACKAGE_PATTERN_STRING =
62 "(org.opendaylight.yang.gen.v1.[a-z0-9_\\.]*\\.(?:rev[0-9][0-9][0-1][0-9][0-3][0-9]|norev))";
63 private static final Pattern ROOT_PACKAGE_PATTERN = Pattern.compile(ROOT_PACKAGE_PATTERN_STRING);
64 private static final Logger LOG = LoggerFactory.getLogger(BindingReflections.class);
66 private static final LoadingCache<Class<?>, Optional<QName>> CLASS_TO_QNAME = CacheBuilder.newBuilder()
68 .expireAfterAccess(EXPIRATION_TIME, TimeUnit.SECONDS)
69 .build(new ClassToQNameLoader());
71 private static final LoadingCache<ClassLoader, ImmutableSet<YangModuleInfo>> MODULE_INFO_CACHE =
72 CacheBuilder.newBuilder().weakKeys().weakValues().build(
73 new CacheLoader<ClassLoader, ImmutableSet<YangModuleInfo>>() {
75 public ImmutableSet<YangModuleInfo> load(final ClassLoader key) {
76 return loadModuleInfos(key);
80 private BindingReflections() {
81 throw new UnsupportedOperationException("Utility class.");
85 * Find augmentation target class from concrete Augmentation class. This method uses first generic argument of
86 * implemented {@link Augmentation} interface.
89 * {@link Augmentation} subclass for which we want to determine
90 * augmentation target.
91 * @return Augmentation target - class which augmentation provides additional extensions.
93 public static Class<? extends Augmentable<?>> findAugmentationTarget(
94 final Class<? extends Augmentation<?>> augmentation) {
95 return ClassLoaderUtils.findFirstGenericArgument(augmentation, Augmentation.class);
99 * Find data hierarchy parent from concrete Data class. This method uses first generic argument of implemented
100 * {@link ChildOf} interface.
103 * child class for which we want to find the parent class.
104 * @return Parent class, e.g. class of which the childClass is ChildOf.
106 public static Class<?> findHierarchicalParent(final Class<? extends ChildOf<?>> childClass) {
107 return ClassLoaderUtils.findFirstGenericArgument(childClass, ChildOf.class);
111 * Find data hierarchy parent from concrete Data class. This method is shorthand which gets DataObject class by
112 * invoking {@link DataObject#getImplementedInterface()} and uses {@link #findHierarchicalParent(Class)}.
115 * Child object for which the parent needs to be located.
116 * @return Parent class, or null if a parent is not found.
118 public static Class<?> findHierarchicalParent(final DataObject child) {
119 if (child instanceof ChildOf) {
120 return ClassLoaderUtils.findFirstGenericArgument(child.getImplementedInterface(), ChildOf.class);
126 * Returns a QName associated to supplied type.
128 * @param dataType Data type class
129 * @return QName associated to supplied dataType. If dataType is Augmentation method does not return canonical
130 * QName, but QName with correct namespace revision, but virtual local name, since augmentations do not
131 * have name. May return null if QName is not present.
133 public static QName findQName(final Class<?> dataType) {
134 return CLASS_TO_QNAME.getUnchecked(dataType).orElse(null);
138 * Checks if method is RPC invocation.
140 * @param possibleMethod
142 * @return true if method is RPC invocation, false otherwise.
144 public static boolean isRpcMethod(final Method possibleMethod) {
145 return possibleMethod != null && RpcService.class.isAssignableFrom(possibleMethod.getDeclaringClass())
146 && ListenableFuture.class.isAssignableFrom(possibleMethod.getReturnType())
147 // length <= 2: it seemed to be impossible to get correct RpcMethodInvoker because of
148 // resolveRpcInputClass() check.While RpcMethodInvoker counts with one argument for
149 // non input type and two arguments for input type, resolveRpcInputClass() counting
150 // with zero for non input and one for input type
151 && possibleMethod.getParameterCount() <= 2;
155 * Extracts Output class for RPC method.
157 * @param targetMethod
159 * @return Optional.empty() if result type could not be get, or return type is Void.
161 @SuppressWarnings("rawtypes")
162 public static Optional<Class<?>> resolveRpcOutputClass(final Method targetMethod) {
163 checkState(isRpcMethod(targetMethod), "Supplied method is not a RPC invocation method");
164 Type futureType = targetMethod.getGenericReturnType();
165 Type rpcResultType = ClassLoaderUtils.getFirstGenericParameter(futureType);
166 Type rpcResultArgument = ClassLoaderUtils.getFirstGenericParameter(rpcResultType);
167 if (rpcResultArgument instanceof Class && !Void.class.equals(rpcResultArgument)) {
168 return Optional.of((Class) rpcResultArgument);
170 return Optional.empty();
174 * Extracts input class for RPC method.
176 * @param targetMethod
178 * @return Optional.empty() if RPC has no input, RPC input type otherwise.
180 @SuppressWarnings("rawtypes")
181 public static Optional<Class<? extends DataContainer>> resolveRpcInputClass(final Method targetMethod) {
182 for (Class clazz : targetMethod.getParameterTypes()) {
183 if (DataContainer.class.isAssignableFrom(clazz)) {
184 return Optional.of(clazz);
187 return Optional.empty();
190 public static QName getQName(final Class<? extends BaseIdentity> context) {
191 return findQName(context);
195 * Checks if class is child of augmentation.
197 public static boolean isAugmentationChild(final Class<?> clazz) {
198 // FIXME: Current resolver could be still confused when child node was added by grouping
199 checkArgument(clazz != null);
201 @SuppressWarnings({ "rawtypes", "unchecked" })
202 Class<?> parent = findHierarchicalParent((Class) clazz);
203 if (parent == null) {
204 LOG.debug("Did not find a parent for class {}", clazz);
208 String clazzModelPackage = getModelRootPackageName(clazz.getPackage());
209 String parentModelPackage = getModelRootPackageName(parent.getPackage());
211 return !clazzModelPackage.equals(parentModelPackage);
215 * Returns root package name for supplied package.
218 * Package for which find model root package.
219 * @return Package of model root.
221 public static String getModelRootPackageName(final Package pkg) {
222 return getModelRootPackageName(pkg.getName());
226 * Returns root package name for supplied package name.
229 * Package for which find model root package.
230 * @return Package of model root.
232 public static String getModelRootPackageName(final String name) {
233 checkArgument(name != null, "Package name should not be null.");
234 checkArgument(name.startsWith(BindingMapping.PACKAGE_PREFIX), "Package name not starting with %s, is: %s",
235 BindingMapping.PACKAGE_PREFIX, name);
236 Matcher match = ROOT_PACKAGE_PATTERN.matcher(name);
237 checkArgument(match.find(), "Package name '%s' does not match required pattern '%s'", name,
238 ROOT_PACKAGE_PATTERN_STRING);
239 return match.group(0);
242 @SuppressWarnings("checkstyle:illegalCatch")
243 public static QNameModule getQNameModule(final Class<?> clz) {
244 if (DataContainer.class.isAssignableFrom(clz) || BaseIdentity.class.isAssignableFrom(clz)
245 || Action.class.isAssignableFrom(clz)) {
246 return findQName(clz).getModule();
249 return BindingReflections.getModuleInfo(clz).getName().getModule();
250 } catch (Exception e) {
251 throw new IllegalStateException("Unable to get QName of defining model.", e);
256 * Returns instance of {@link YangModuleInfo} of declaring model for specific class.
258 * @param cls data object class
259 * @return Instance of {@link YangModuleInfo} associated with model, from
260 * which this class was derived.
262 public static YangModuleInfo getModuleInfo(final Class<?> cls) throws Exception {
263 checkArgument(cls != null);
264 String packageName = getModelRootPackageName(cls.getPackage());
265 final String potentialClassName = getModuleInfoClassName(packageName);
266 return ClassLoaderUtils.callWithClassLoader(cls.getClassLoader(), () -> {
267 Class<?> moduleInfoClass = Thread.currentThread().getContextClassLoader().loadClass(potentialClassName);
268 return (YangModuleInfo) moduleInfoClass.getMethod("getInstance").invoke(null);
272 public static String getModuleInfoClassName(final String packageName) {
273 return packageName + "." + BindingMapping.MODULE_INFO_CLASS_NAME;
277 * Check if supplied class is derived from YANG model.
281 * @return true if class is derived from YANG model.
283 public static boolean isBindingClass(final Class<?> cls) {
284 if (DataContainer.class.isAssignableFrom(cls) || Augmentation.class.isAssignableFrom(cls)) {
287 return cls.getName().startsWith(BindingMapping.PACKAGE_PREFIX);
291 * Checks if supplied method is callback for notifications.
293 * @param method method to check
294 * @return true if method is notification callback.
296 public static boolean isNotificationCallback(final Method method) {
297 checkArgument(method != null);
298 if (method.getName().startsWith("on") && method.getParameterCount() == 1) {
299 Class<?> potentialNotification = method.getParameterTypes()[0];
300 if (isNotification(potentialNotification)
301 && method.getName().equals("on" + potentialNotification.getSimpleName())) {
309 * Checks is supplied class is a {@link Notification}.
311 * @param potentialNotification class to examine
312 * @return True if the class represents a Notification.
314 public static boolean isNotification(final Class<?> potentialNotification) {
315 checkArgument(potentialNotification != null, "potentialNotification must not be null.");
316 return Notification.class.isAssignableFrom(potentialNotification);
320 * Loads {@link YangModuleInfo} infos available on current classloader. This method is shorthand for
321 * {@link #loadModuleInfos(ClassLoader)} with {@link Thread#getContextClassLoader()} for current thread.
323 * @return Set of {@link YangModuleInfo} available for current classloader.
325 public static ImmutableSet<YangModuleInfo> loadModuleInfos() {
326 return loadModuleInfos(Thread.currentThread().getContextClassLoader());
330 * Loads {@link YangModuleInfo} infos available on supplied classloader.
333 * {@link YangModuleInfo} are discovered using {@link ServiceLoader} for {@link YangModelBindingProvider}.
334 * {@link YangModelBindingProvider} are simple classes which holds only pointers to actual instance
335 * {@link YangModuleInfo}.
338 * When {@link YangModuleInfo} is available, all dependencies are recursively collected into returning set by
339 * collecting results of {@link YangModuleInfo#getImportedModules()}.
342 * Consider using {@link #cacheModuleInfos(ClassLoader)} if the classloader is known to be immutable.
344 * @param loader Classloader for which {@link YangModuleInfo} should be retrieved.
345 * @return Set of {@link YangModuleInfo} available for supplied classloader.
347 public static ImmutableSet<YangModuleInfo> loadModuleInfos(final ClassLoader loader) {
348 Builder<YangModuleInfo> moduleInfoSet = ImmutableSet.builder();
349 ServiceLoader<YangModelBindingProvider> serviceLoader = ServiceLoader.load(YangModelBindingProvider.class,
351 for (YangModelBindingProvider bindingProvider : serviceLoader) {
352 YangModuleInfo moduleInfo = bindingProvider.getModuleInfo();
353 checkState(moduleInfo != null, "Module Info for %s is not available.", bindingProvider.getClass());
354 collectYangModuleInfo(bindingProvider.getModuleInfo(), moduleInfoSet);
356 return moduleInfoSet.build();
360 * Loads {@link YangModuleInfo} instances available on supplied {@link ClassLoader}, assuming the set of available
361 * information does not change. Subsequent accesses may return cached values.
364 * {@link YangModuleInfo} are discovered using {@link ServiceLoader} for {@link YangModelBindingProvider}.
365 * {@link YangModelBindingProvider} are simple classes which holds only pointers to actual instance
366 * {@link YangModuleInfo}.
369 * When {@link YangModuleInfo} is available, all dependencies are recursively collected into returning set by
370 * collecting results of {@link YangModuleInfo#getImportedModules()}.
372 * @param loader Class loader for which {@link YangModuleInfo} should be retrieved.
373 * @return Set of {@link YangModuleInfo} available for supplied classloader.
376 public static ImmutableSet<YangModuleInfo> cacheModuleInfos(final ClassLoader loader) {
377 return MODULE_INFO_CACHE.getUnchecked(loader);
380 private static void collectYangModuleInfo(final YangModuleInfo moduleInfo,
381 final Builder<YangModuleInfo> moduleInfoSet) {
382 moduleInfoSet.add(moduleInfo);
383 for (YangModuleInfo dependency : moduleInfo.getImportedModules()) {
384 collectYangModuleInfo(dependency, moduleInfoSet);
389 * Checks if supplied class represents RPC Input / RPC Output.
392 * Class to be checked
393 * @return true if class represents RPC Input or RPC Output class.
395 public static boolean isRpcType(final Class<? extends DataObject> targetType) {
396 return DataContainer.class.isAssignableFrom(targetType)
397 && !ChildOf.class.isAssignableFrom(targetType)
398 && !Notification.class.isAssignableFrom(targetType)
399 && (targetType.getName().endsWith("Input") || targetType.getName().endsWith("Output"));
403 * Scans supplied class and returns an iterable of all data children classes.
406 * YANG Modeled Entity derived from DataContainer
407 * @return Iterable of all data children, which have YANG modeled entity
409 @SuppressWarnings("unchecked")
410 public static Iterable<Class<? extends DataObject>> getChildrenClasses(final Class<? extends DataContainer> type) {
411 checkArgument(type != null, "Target type must not be null");
412 checkArgument(DataContainer.class.isAssignableFrom(type), "Supplied type must be derived from DataContainer");
413 List<Class<? extends DataObject>> ret = new LinkedList<>();
414 for (Method method : type.getMethods()) {
415 Optional<Class<? extends DataContainer>> entity = getYangModeledReturnType(method,
416 BindingMapping.GETTER_PREFIX);
417 if (entity.isPresent()) {
418 ret.add((Class<? extends DataObject>) entity.get());
425 * Scans supplied class and returns an iterable of all data children classes.
428 * YANG Modeled Entity derived from DataContainer
429 * @return Iterable of all data children, which have YANG modeled entity
431 public static Map<Class<?>, Method> getChildrenClassToMethod(final Class<?> type) {
432 return getChildrenClassToMethod(type, BindingMapping.GETTER_PREFIX);
435 private static Map<Class<?>, Method> getChildrenClassToMethod(final Class<?> type, final String prefix) {
436 checkArgument(type != null, "Target type must not be null");
437 checkArgument(DataContainer.class.isAssignableFrom(type), "Supplied type %s must be derived from DataContainer",
439 Map<Class<?>, Method> ret = new HashMap<>();
440 for (Method method : type.getMethods()) {
441 Optional<Class<? extends DataContainer>> entity = getYangModeledReturnType(method, prefix);
442 if (entity.isPresent()) {
443 ret.put(entity.get(), method);
450 public static Map<Class<?>, Method> getChildrenClassToNonnullMethod(final Class<?> type) {
451 return getChildrenClassToMethod(type, BindingMapping.NONNULL_PREFIX);
454 @SuppressWarnings({ "unchecked", "rawtypes", "checkstyle:illegalCatch" })
455 private static Optional<Class<? extends DataContainer>> getYangModeledReturnType(final Method method,
456 final String prefix) {
457 final String methodName = method.getName();
458 if ("getClass".equals(methodName) || !methodName.startsWith(prefix) || method.getParameterCount() > 0) {
459 return Optional.empty();
462 Class returnType = method.getReturnType();
463 if (DataContainer.class.isAssignableFrom(returnType)) {
464 return Optional.of(returnType);
466 if (List.class.isAssignableFrom(returnType)) {
468 return ClassLoaderUtils.callWithClassLoader(method.getDeclaringClass().getClassLoader(), () -> {
469 Type listResult = ClassLoaderUtils.getFirstGenericParameter(method.getGenericReturnType());
470 if (listResult instanceof Class && DataContainer.class.isAssignableFrom((Class) listResult)) {
471 return Optional.of((Class) listResult);
473 return Optional.empty();
475 } catch (Exception e) {
477 * It is safe to log this this exception on debug, since this
478 * method should not fail. Only failures are possible if the
481 LOG.debug("Unable to find YANG modeled return type for {}", method, e);
484 return Optional.empty();
487 private static class ClassToQNameLoader extends CacheLoader<Class<?>, Optional<QName>> {
490 public Optional<QName> load(@SuppressWarnings("NullableProblems") final Class<?> key) throws Exception {
491 return resolveQNameNoCache(key);
495 * Tries to resolve QName for supplied class. Looks up for static field with name from constant
496 * {@link BindingMapping#QNAME_STATIC_FIELD_NAME} and returns value if present. If field is not present uses
497 * {@link #computeQName(Class)} to compute QName for missing types.
499 private static Optional<QName> resolveQNameNoCache(final Class<?> key) {
503 field = key.getField(BindingMapping.QNAME_STATIC_FIELD_NAME);
504 } catch (NoSuchFieldException e) {
505 LOG.debug("{} does not have a {} field, falling back to computation", key,
506 BindingMapping.QNAME_STATIC_FIELD_NAME, e);
507 return Optional.of(computeQName(key));
510 final Object obj = field.get(null);
511 if (obj instanceof QName) {
512 return Optional.of((QName) obj);
514 } catch (SecurityException | IllegalArgumentException | IllegalAccessException e) {
516 * It is safe to log this this exception on debug, since this method should not fail. Only failures are
517 * possible if the runtime / backing is inconsistent.
519 LOG.debug("Unexpected exception during extracting QName for {}", key, e);
521 return Optional.empty();
525 * Computes QName for supplied class. Namespace and revision are same as {@link YangModuleInfo} associated with
531 * <li>rpc input: local name is "input".
532 * <li>rpc output: local name is "output".
533 * <li>augmentation: local name is "module name".
537 * There is also fallback, if it is not possible to compute QName using following algorithm returns module
540 * @throws IllegalStateException If YangModuleInfo could not be resolved
541 * @throws IllegalArgumentException If supplied class was not derived from YANG model.
543 // FIXME: Extend this algorithm to also provide QName for YANG modeled simple types.
544 @SuppressWarnings({ "rawtypes", "unchecked", "checkstyle:illegalCatch" })
545 private static QName computeQName(final Class key) {
546 checkArgument(isBindingClass(key), "Supplied class %s is not derived from YANG.", key);
548 YangModuleInfo moduleInfo;
550 moduleInfo = getModuleInfo(key);
551 } catch (Exception e) {
552 throw new IllegalStateException("Unable to get QName for " + key + ". YangModuleInfo was not found.",
555 final QName module = moduleInfo.getName();
556 if (Augmentation.class.isAssignableFrom(key)) {
558 } else if (isRpcType(key)) {
559 final String className = key.getSimpleName();
560 if (className.endsWith(BindingMapping.RPC_OUTPUT_SUFFIX)) {
561 return YangConstants.operationOutputQName(module.getModule()).intern();
564 return YangConstants.operationInputQName(module.getModule()).intern();
568 * Fallback for Binding types which do not have QNAME field
575 * Extracts augmentation from Binding DTO field using reflection.
578 * Instance of DataObject which is augmentable and may contain
580 * @return Map of augmentations if read was successful, otherwise empty map.
582 public static Map<Class<? extends Augmentation<?>>, Augmentation<?>> getAugmentations(final Augmentable<?> input) {
583 if (input instanceof AugmentationHolder) {
584 return ((AugmentationHolder) input).augmentations();
586 return AugmentationFieldGetter.getGetter(input.getClass()).getAugmentations(input);
590 * Determines if two augmentation classes or case classes represents same
594 * Two augmentations or cases could be substituted only if and if:
596 * <li>Both implements same interfaces</li>
597 * <li>Both have same children</li>
598 * <li>If augmentations: Both have same augmentation target class. Target
599 * class was generated for data node in grouping.</li>
600 * <li>If cases: Both are from same choice. Choice class was generated for
601 * data node in grouping.</li>
605 * <b>Explanation:</b> Binding Specification reuses classes generated for
606 * groupings as part of normal data tree, this classes from grouping could
607 * be used at various locations and user may not be aware of it and may use
608 * incorrect case or augmentation in particular subtree (via copy
609 * constructors, etc).
612 * Class which is potential substitution
614 * Class which should be used at particular subtree
615 * @return true if and only if classes represents same data.
617 @SuppressWarnings({ "rawtypes", "unchecked" })
618 public static boolean isSubstitutionFor(final Class potential, final Class target) {
619 Set<Class> subImplemented = new HashSet<>(Arrays.asList(potential.getInterfaces()));
620 Set<Class> targetImplemented = new HashSet<>(Arrays.asList(target.getInterfaces()));
621 if (!subImplemented.equals(targetImplemented)) {
624 if (Augmentation.class.isAssignableFrom(potential)
625 && !BindingReflections.findAugmentationTarget(potential).equals(
626 BindingReflections.findAugmentationTarget(target))) {
629 for (Method potentialMethod : potential.getMethods()) {
631 Method targetMethod = target.getMethod(potentialMethod.getName(), potentialMethod.getParameterTypes());
632 if (!potentialMethod.getReturnType().equals(targetMethod.getReturnType())) {
635 } catch (NoSuchMethodException e) {
636 // Counterpart method is missing, so classes could not be substituted.
638 } catch (SecurityException e) {
639 throw new IllegalStateException("Could not compare methods", e);