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.yangtools.yang.binding.util;
10 import static com.google.common.base.Preconditions.checkArgument;
11 import static com.google.common.base.Preconditions.checkState;
13 import com.google.common.base.Optional;
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.collect.Sets;
20 import java.lang.reflect.Field;
21 import java.lang.reflect.Method;
22 import java.lang.reflect.Type;
23 import java.util.HashMap;
24 import java.util.HashSet;
25 import java.util.LinkedList;
26 import java.util.List;
28 import java.util.ServiceLoader;
29 import java.util.concurrent.Callable;
30 import java.util.concurrent.Future;
31 import java.util.concurrent.TimeUnit;
32 import java.util.regex.Matcher;
33 import java.util.regex.Pattern;
34 import javax.annotation.RegEx;
35 import org.opendaylight.yangtools.util.ClassLoaderUtils;
36 import org.opendaylight.yangtools.yang.binding.Augmentable;
37 import org.opendaylight.yangtools.yang.binding.Augmentation;
38 import org.opendaylight.yangtools.yang.binding.BaseIdentity;
39 import org.opendaylight.yangtools.yang.binding.BindingMapping;
40 import org.opendaylight.yangtools.yang.binding.ChildOf;
41 import org.opendaylight.yangtools.yang.binding.DataContainer;
42 import org.opendaylight.yangtools.yang.binding.DataObject;
43 import org.opendaylight.yangtools.yang.binding.Notification;
44 import org.opendaylight.yangtools.yang.binding.RpcService;
45 import org.opendaylight.yangtools.yang.binding.YangModelBindingProvider;
46 import org.opendaylight.yangtools.yang.binding.YangModuleInfo;
47 import org.opendaylight.yangtools.yang.common.QName;
48 import org.opendaylight.yangtools.yang.common.QNameModule;
49 import org.slf4j.Logger;
50 import org.slf4j.LoggerFactory;
52 public final class BindingReflections {
54 private static final long EXPIRATION_TIME = 60;
57 private static final String ROOT_PACKAGE_PATTERN_STRING =
58 "(org.opendaylight.yang.gen.v1.[a-z0-9_\\.]*\\.rev[0-9][0-9][0-1][0-9][0-3][0-9])";
59 private static final Pattern ROOT_PACKAGE_PATTERN = Pattern.compile(ROOT_PACKAGE_PATTERN_STRING);
60 private static final Logger LOG = LoggerFactory.getLogger(BindingReflections.class);
62 private static final LoadingCache<Class<?>, Optional<QName>> CLASS_TO_QNAME = CacheBuilder.newBuilder()
64 .expireAfterAccess(EXPIRATION_TIME, TimeUnit.SECONDS)
65 .build(new ClassToQNameLoader());
67 private BindingReflections() {
68 throw new UnsupportedOperationException("Utility class.");
72 * Find augmentation target class from concrete Augmentation class. This method uses first generic argument of
73 * implemented {@link Augmentation} interface.
76 * {@link Augmentation} subclass for which we want to determine
77 * augmentation target.
78 * @return Augmentation target - class which augmentation provides additional extensions.
80 public static Class<? extends Augmentable<?>> findAugmentationTarget(
81 final Class<? extends Augmentation<?>> augmentation) {
82 return ClassLoaderUtils.findFirstGenericArgument(augmentation, Augmentation.class);
86 * Find data hierarchy parent from concrete Data class. This method uses first generic argument of implemented
87 * {@link ChildOf} interface.
90 * child class for which we want to find the parent class.
91 * @return Parent class, e.g. class of which the childClass is ChildOf.
93 public static Class<?> findHierarchicalParent(final Class<? extends ChildOf<?>> childClass) {
94 return ClassLoaderUtils.findFirstGenericArgument(childClass, ChildOf.class);
98 * Find data hierarchy parent from concrete Data class. This method is shorthand which gets DataObject class by
99 * invoking {@link DataObject#getImplementedInterface()} and uses {@link #findHierarchicalParent(Class)}.
102 * Child object for which the parent needs to be located.
103 * @return Parent class, or null if a parent is not found.
105 public static Class<?> findHierarchicalParent(final DataObject child) {
106 if (child instanceof ChildOf) {
107 return ClassLoaderUtils.findFirstGenericArgument(child.getImplementedInterface(), ChildOf.class);
113 * Returns a QName associated to supplied type.
115 * @param dataType Data type class
116 * @return QName associated to supplied dataType. If dataType is Augmentation method does not return canonical
117 * QName, but QName with correct namespace revision, but virtual local name, since augmentations do not
118 * have name. May return null if QName is not present.
120 public static QName findQName(final Class<?> dataType) {
121 return CLASS_TO_QNAME.getUnchecked(dataType).orNull();
125 * Checks if method is RPC invocation.
127 * @param possibleMethod
129 * @return true if method is RPC invocation, false otherwise.
131 public static boolean isRpcMethod(final Method possibleMethod) {
132 return possibleMethod != null && RpcService.class.isAssignableFrom(possibleMethod.getDeclaringClass())
133 && Future.class.isAssignableFrom(possibleMethod.getReturnType())
134 // length <= 2: it seemed to be impossible to get correct RpcMethodInvoker because of
135 // resolveRpcInputClass() check.While RpcMethodInvoker counts with one argument for
136 // non input type and two arguments for input type, resolveRpcInputClass() counting
137 // with zero for non input and one for input type
138 && possibleMethod.getParameterTypes().length <= 2;
142 * Extracts Output class for RPC method.
144 * @param targetMethod
146 * @return Optional.absent() if result type could not be get, or return type is Void.
148 @SuppressWarnings("rawtypes")
149 public static Optional<Class<?>> resolveRpcOutputClass(final Method targetMethod) {
150 checkState(isRpcMethod(targetMethod), "Supplied method is not a RPC invocation method");
151 Type futureType = targetMethod.getGenericReturnType();
152 Type rpcResultType = ClassLoaderUtils.getFirstGenericParameter(futureType);
153 Type rpcResultArgument = ClassLoaderUtils.getFirstGenericParameter(rpcResultType);
154 if (rpcResultArgument instanceof Class && !Void.class.equals(rpcResultArgument)) {
155 return Optional.of((Class) rpcResultArgument);
157 return Optional.absent();
161 * Extracts input class for RPC method.
163 * @param targetMethod
165 * @return Optional.absent() if RPC has no input, RPC input type otherwise.
167 @SuppressWarnings("rawtypes")
168 public static Optional<Class<? extends DataContainer>> resolveRpcInputClass(final Method targetMethod) {
169 for (Class clazz : targetMethod.getParameterTypes()) {
170 if (DataContainer.class.isAssignableFrom(clazz)) {
171 return Optional.of(clazz);
174 return Optional.absent();
177 public static QName getQName(final Class<? extends BaseIdentity> context) {
178 return findQName(context);
182 * Checks if class is child of augmentation.
184 public static boolean isAugmentationChild(final Class<?> clazz) {
185 // FIXME: Current resolver could be still confused when child node was added by grouping
186 checkArgument(clazz != null);
188 @SuppressWarnings({ "rawtypes", "unchecked" })
189 Class<?> parent = findHierarchicalParent((Class) clazz);
190 if (parent == null) {
191 LOG.debug("Did not find a parent for class {}", clazz);
195 String clazzModelPackage = getModelRootPackageName(clazz.getPackage());
196 String parentModelPackage = getModelRootPackageName(parent.getPackage());
198 return !clazzModelPackage.equals(parentModelPackage);
202 * Returns root package name for suplied package.
205 * Package for which find model root package.
206 * @return Package of model root.
208 public static String getModelRootPackageName(final Package pkg) {
209 return getModelRootPackageName(pkg.getName());
213 * Returns root package name for supplied package name.
216 * Package for which find model root package.
217 * @return Package of model root.
219 public static String getModelRootPackageName(final String name) {
220 checkArgument(name != null, "Package name should not be null.");
221 checkArgument(name.startsWith(BindingMapping.PACKAGE_PREFIX), "Package name not starting with %s, is: %s",
222 BindingMapping.PACKAGE_PREFIX, name);
223 Matcher match = ROOT_PACKAGE_PATTERN.matcher(name);
224 checkArgument(match.find(), "Package name '%s' does not match required pattern '%s'", name,
225 ROOT_PACKAGE_PATTERN_STRING);
226 return match.group(0);
229 @SuppressWarnings("checkstyle:illegalCatch")
230 public static QNameModule getQNameModule(final Class<?> clz) {
231 if (DataContainer.class.isAssignableFrom(clz) || BaseIdentity.class.isAssignableFrom(clz)) {
232 return findQName(clz).getModule();
235 return BindingReflections.getModuleInfo(clz).getName().getModule();
236 } catch (Exception e) {
237 throw new IllegalStateException("Unable to get QName of defining model.", e);
242 * Extract a QNameModule from YangModuleInfo.
244 * @param modInfo Module info
245 * @return QNameModule for the module
246 * @throws NullPointerException in modInfo is null
248 * @deprecated Use {@code YangModuleInfo.getName().getModule()} instead.
251 public static QNameModule getQNameModule(final YangModuleInfo modInfo) {
252 return modInfo.getName().getModule();
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.withClassLoader(cls.getClassLoader(), (Callable<YangModuleInfo>) () -> {
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.getParameterTypes().length == 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 * Classloader for which {@link YangModuleInfo} should be
344 * @return Set of {@link YangModuleInfo} available for supplied classloader.
346 public static ImmutableSet<YangModuleInfo> loadModuleInfos(final ClassLoader loader) {
347 Builder<YangModuleInfo> moduleInfoSet = ImmutableSet.builder();
348 ServiceLoader<YangModelBindingProvider> serviceLoader = ServiceLoader.load(YangModelBindingProvider.class,
350 for (YangModelBindingProvider bindingProvider : serviceLoader) {
351 YangModuleInfo moduleInfo = bindingProvider.getModuleInfo();
352 checkState(moduleInfo != null, "Module Info for %s is not available.", bindingProvider.getClass());
353 collectYangModuleInfo(bindingProvider.getModuleInfo(), moduleInfoSet);
355 return moduleInfoSet.build();
358 private static void collectYangModuleInfo(final YangModuleInfo moduleInfo,
359 final Builder<YangModuleInfo> moduleInfoSet) {
360 moduleInfoSet.add(moduleInfo);
361 for (YangModuleInfo dependency : moduleInfo.getImportedModules()) {
362 collectYangModuleInfo(dependency, moduleInfoSet);
367 * Checks if supplied class represents RPC Input / RPC Output.
370 * Class to be checked
371 * @return true if class represents RPC Input or RPC Output class.
373 public static boolean isRpcType(final Class<? extends DataObject> targetType) {
374 return DataContainer.class.isAssignableFrom(targetType)
375 && !ChildOf.class.isAssignableFrom(targetType)
376 && !Notification.class.isAssignableFrom(targetType)
377 && (targetType.getName().endsWith("Input") || targetType.getName().endsWith("Output"));
381 * Scans supplied class and returns an iterable of all data children classes.
384 * YANG Modeled Entity derived from DataContainer
385 * @return Iterable of all data children, which have YANG modeled entity
387 @SuppressWarnings("unchecked")
388 public static Iterable<Class<? extends DataObject>> getChildrenClasses(final Class<? extends DataContainer> type) {
389 checkArgument(type != null, "Target type must not be null");
390 checkArgument(DataContainer.class.isAssignableFrom(type), "Supplied type must be derived from DataContainer");
391 List<Class<? extends DataObject>> ret = new LinkedList<>();
392 for (Method method : type.getMethods()) {
393 Optional<Class<? extends DataContainer>> entity = getYangModeledReturnType(method);
394 if (entity.isPresent()) {
395 ret.add((Class<? extends DataObject>) entity.get());
402 * Scans supplied class and returns an iterable of all data children classes.
405 * YANG Modeled Entity derived from DataContainer
406 * @return Iterable of all data children, which have YANG modeled entity
408 public static Map<Class<?>, Method> getChildrenClassToMethod(final Class<?> type) {
409 checkArgument(type != null, "Target type must not be null");
410 checkArgument(DataContainer.class.isAssignableFrom(type), "Supplied type must be derived from DataContainer");
411 Map<Class<?>, Method> ret = new HashMap<>();
412 for (Method method : type.getMethods()) {
413 Optional<Class<? extends DataContainer>> entity = getYangModeledReturnType(method);
414 if (entity.isPresent()) {
415 ret.put(entity.get(), method);
421 @SuppressWarnings({ "unchecked", "rawtypes", "checkstyle:illegalCatch" })
422 private static Optional<Class<? extends DataContainer>> getYangModeledReturnType(final Method method) {
423 if ("getClass".equals(method.getName()) || !method.getName().startsWith("get")
424 || method.getParameterTypes().length > 0) {
425 return Optional.absent();
428 Class returnType = method.getReturnType();
429 if (DataContainer.class.isAssignableFrom(returnType)) {
430 return Optional.of(returnType);
431 } else if (List.class.isAssignableFrom(returnType)) {
433 return ClassLoaderUtils.withClassLoader(method.getDeclaringClass().getClassLoader(),
434 (Callable<Optional<Class<? extends DataContainer>>>) () -> {
435 Type listResult = ClassLoaderUtils.getFirstGenericParameter(method.getGenericReturnType());
436 if (listResult instanceof Class
437 && DataContainer.class.isAssignableFrom((Class) listResult)) {
438 return Optional.of((Class) listResult);
440 return Optional.absent();
442 } catch (Exception e) {
444 * It is safe to log this this exception on debug, since this
445 * method should not fail. Only failures are possible if the
448 LOG.debug("Unable to find YANG modeled return type for {}", method, e);
451 return Optional.absent();
454 private static class ClassToQNameLoader extends CacheLoader<Class<?>, Optional<QName>> {
457 public Optional<QName> load(@SuppressWarnings("NullableProblems") final Class<?> key) throws Exception {
458 return resolveQNameNoCache(key);
462 * Tries to resolve QName for supplied class. Looks up for static field with name from constant
463 * {@link BindingMapping#QNAME_STATIC_FIELD_NAME} and returns value if present. If field is not present uses
464 * {@link #computeQName(Class)} to compute QName for missing types.
466 private static Optional<QName> resolveQNameNoCache(final Class<?> key) {
468 Field field = key.getField(BindingMapping.QNAME_STATIC_FIELD_NAME);
469 Object obj = field.get(null);
470 if (obj instanceof QName) {
471 return Optional.of((QName) obj);
474 } catch (NoSuchFieldException e) {
475 return Optional.of(computeQName(key));
477 } catch (SecurityException | IllegalArgumentException | IllegalAccessException e) {
480 * It is safe to log this this exception on debug, since this method
481 * should not fail. Only failures are possible if the runtime /
484 LOG.debug("Unexpected exception during extracting QName for {}", key, e);
486 return Optional.absent();
490 * Computes QName for supplied class. Namespace and revision are same as {@link YangModuleInfo} associated with
496 * <li>rpc input: local name is "input".
497 * <li>rpc output: local name is "output".
498 * <li>augmentation: local name is "module name".
502 * There is also fallback, if it is not possible to compute QName using following algorithm returns module
505 * @throws IllegalStateException If YangModuleInfo could not be resolved
506 * @throws IllegalArgumentException If supplied class was not derived from YANG model.
508 // FIXME: Extend this algorithm to also provide QName for YANG modeled simple types.
509 @SuppressWarnings({ "rawtypes", "unchecked", "checkstyle:illegalCatch" })
510 private static QName computeQName(final Class key) {
511 checkArgument(isBindingClass(key), "Supplied class %s is not derived from YANG.", key);
513 YangModuleInfo moduleInfo;
515 moduleInfo = getModuleInfo(key);
516 } catch (Exception e) {
517 throw new IllegalStateException("Unable to get QName for " + key + ". YangModuleInfo was not found.",
520 final QName module = moduleInfo.getName();
521 if (Augmentation.class.isAssignableFrom(key)) {
523 } else if (isRpcType(key)) {
524 final String className = key.getSimpleName();
525 if (className.endsWith(BindingMapping.RPC_OUTPUT_SUFFIX)) {
526 return QName.create(module, "output").intern();
528 return QName.create(module, "input").intern();
533 * Fallback for Binding types which do not have QNAME field
541 * Given a {@link YangModuleInfo}, create a QName representing it. The QName is formed by reusing the module's
542 * namespace and revision using the module's name as the QName's local name.
546 * @return QName representing the module
548 * @deprecated Use {@link YangModuleInfo#getName()} instead.
551 public static QName getModuleQName(final YangModuleInfo moduleInfo) {
552 checkArgument(moduleInfo != null, "moduleInfo must not be null.");
553 return moduleInfo.getName();
557 * Extracts augmentation from Binding DTO field using reflection.
560 * Instance of DataObject which is augmentable and may contain
562 * @return Map of augmentations if read was successful, otherwise empty map.
564 public static Map<Class<? extends Augmentation<?>>, Augmentation<?>> getAugmentations(final Augmentable<?> input) {
565 return AugmentationFieldGetter.getGetter(input.getClass()).getAugmentations(input);
569 * Determines if two augmentation classes or case classes represents same
573 * Two augmentations or cases could be substituted only if and if:
575 * <li>Both implements same interfaces</li>
576 * <li>Both have same children</li>
577 * <li>If augmentations: Both have same augmentation target class. Target
578 * class was generated for data node in grouping.</li>
579 * <li>If cases: Both are from same choice. Choice class was generated for
580 * data node in grouping.</li>
584 * <b>Explanation:</b> Binding Specification reuses classes generated for
585 * groupings as part of normal data tree, this classes from grouping could
586 * be used at various locations and user may not be aware of it and may use
587 * incorrect case or augmentation in particular subtree (via copy
588 * constructors, etc).
591 * Class which is potential substition
593 * Class which should be used at particular subtree
594 * @return true if and only if classes represents same data.
596 @SuppressWarnings({ "rawtypes", "unchecked" })
597 public static boolean isSubstitutionFor(final Class potential, final Class target) {
598 HashSet<Class> subImplemented = Sets.newHashSet(potential.getInterfaces());
599 HashSet<Class> targetImplemented = Sets.newHashSet(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()) {
610 Method targetMethod = target.getMethod(potentialMethod.getName(), potentialMethod.getParameterTypes());
611 if (!potentialMethod.getReturnType().equals(targetMethod.getReturnType())) {
614 } catch (NoSuchMethodException e) {
615 // Counterpart method is missing, so classes could not be
618 } catch (SecurityException e) {
619 throw new IllegalStateException("Could not compare methods", e);