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.opendaylight.yangtools.yang.common.YangConstants;
50 import org.slf4j.Logger;
51 import org.slf4j.LoggerFactory;
53 public final class BindingReflections {
55 private static final long EXPIRATION_TIME = 60;
58 private static final String ROOT_PACKAGE_PATTERN_STRING =
59 "(org.opendaylight.yang.gen.v1.[a-z0-9_\\.]*\\.rev[0-9][0-9][0-1][0-9][0-3][0-9])";
60 private static final Pattern ROOT_PACKAGE_PATTERN = Pattern.compile(ROOT_PACKAGE_PATTERN_STRING);
61 private static final Logger LOG = LoggerFactory.getLogger(BindingReflections.class);
63 private static final LoadingCache<Class<?>, Optional<QName>> CLASS_TO_QNAME = CacheBuilder.newBuilder()
65 .expireAfterAccess(EXPIRATION_TIME, TimeUnit.SECONDS)
66 .build(new ClassToQNameLoader());
68 private BindingReflections() {
69 throw new UnsupportedOperationException("Utility class.");
73 * Find augmentation target class from concrete Augmentation class. This method uses first generic argument of
74 * implemented {@link Augmentation} interface.
77 * {@link Augmentation} subclass for which we want to determine
78 * augmentation target.
79 * @return Augmentation target - class which augmentation provides additional extensions.
81 public static Class<? extends Augmentable<?>> findAugmentationTarget(
82 final Class<? extends Augmentation<?>> augmentation) {
83 return ClassLoaderUtils.findFirstGenericArgument(augmentation, Augmentation.class);
87 * Find data hierarchy parent from concrete Data class. This method uses first generic argument of implemented
88 * {@link ChildOf} interface.
91 * child class for which we want to find the parent class.
92 * @return Parent class, e.g. class of which the childClass is ChildOf.
94 public static Class<?> findHierarchicalParent(final Class<? extends ChildOf<?>> childClass) {
95 return ClassLoaderUtils.findFirstGenericArgument(childClass, ChildOf.class);
99 * Find data hierarchy parent from concrete Data class. This method is shorthand which gets DataObject class by
100 * invoking {@link DataObject#getImplementedInterface()} and uses {@link #findHierarchicalParent(Class)}.
103 * Child object for which the parent needs to be located.
104 * @return Parent class, or null if a parent is not found.
106 public static Class<?> findHierarchicalParent(final DataObject child) {
107 if (child instanceof ChildOf) {
108 return ClassLoaderUtils.findFirstGenericArgument(child.getImplementedInterface(), ChildOf.class);
114 * Returns a QName associated to supplied type.
116 * @param dataType Data type class
117 * @return QName associated to supplied dataType. If dataType is Augmentation method does not return canonical
118 * QName, but QName with correct namespace revision, but virtual local name, since augmentations do not
119 * have name. May return null if QName is not present.
121 public static QName findQName(final Class<?> dataType) {
122 return CLASS_TO_QNAME.getUnchecked(dataType).orNull();
126 * Checks if method is RPC invocation.
128 * @param possibleMethod
130 * @return true if method is RPC invocation, false otherwise.
132 public static boolean isRpcMethod(final Method possibleMethod) {
133 return possibleMethod != null && RpcService.class.isAssignableFrom(possibleMethod.getDeclaringClass())
134 && Future.class.isAssignableFrom(possibleMethod.getReturnType())
135 // length <= 2: it seemed to be impossible to get correct RpcMethodInvoker because of
136 // resolveRpcInputClass() check.While RpcMethodInvoker counts with one argument for
137 // non input type and two arguments for input type, resolveRpcInputClass() counting
138 // with zero for non input and one for input type
139 && possibleMethod.getParameterTypes().length <= 2;
143 * Extracts Output class for RPC method.
145 * @param targetMethod
147 * @return Optional.absent() if result type could not be get, or return type is Void.
149 @SuppressWarnings("rawtypes")
150 public static Optional<Class<?>> resolveRpcOutputClass(final Method targetMethod) {
151 checkState(isRpcMethod(targetMethod), "Supplied method is not a RPC invocation method");
152 Type futureType = targetMethod.getGenericReturnType();
153 Type rpcResultType = ClassLoaderUtils.getFirstGenericParameter(futureType);
154 Type rpcResultArgument = ClassLoaderUtils.getFirstGenericParameter(rpcResultType);
155 if (rpcResultArgument instanceof Class && !Void.class.equals(rpcResultArgument)) {
156 return Optional.of((Class) rpcResultArgument);
158 return Optional.absent();
162 * Extracts input class for RPC method.
164 * @param targetMethod
166 * @return Optional.absent() if RPC has no input, RPC input type otherwise.
168 @SuppressWarnings("rawtypes")
169 public static Optional<Class<? extends DataContainer>> resolveRpcInputClass(final Method targetMethod) {
170 for (Class clazz : targetMethod.getParameterTypes()) {
171 if (DataContainer.class.isAssignableFrom(clazz)) {
172 return Optional.of(clazz);
175 return Optional.absent();
178 public static QName getQName(final Class<? extends BaseIdentity> context) {
179 return findQName(context);
183 * Checks if class is child of augmentation.
185 public static boolean isAugmentationChild(final Class<?> clazz) {
186 // FIXME: Current resolver could be still confused when child node was added by grouping
187 checkArgument(clazz != null);
189 @SuppressWarnings({ "rawtypes", "unchecked" })
190 Class<?> parent = findHierarchicalParent((Class) clazz);
191 if (parent == null) {
192 LOG.debug("Did not find a parent for class {}", clazz);
196 String clazzModelPackage = getModelRootPackageName(clazz.getPackage());
197 String parentModelPackage = getModelRootPackageName(parent.getPackage());
199 return !clazzModelPackage.equals(parentModelPackage);
203 * Returns root package name for suplied package.
206 * Package for which find model root package.
207 * @return Package of model root.
209 public static String getModelRootPackageName(final Package pkg) {
210 return getModelRootPackageName(pkg.getName());
214 * Returns root package name for supplied package name.
217 * Package for which find model root package.
218 * @return Package of model root.
220 public static String getModelRootPackageName(final String name) {
221 checkArgument(name != null, "Package name should not be null.");
222 checkArgument(name.startsWith(BindingMapping.PACKAGE_PREFIX), "Package name not starting with %s, is: %s",
223 BindingMapping.PACKAGE_PREFIX, name);
224 Matcher match = ROOT_PACKAGE_PATTERN.matcher(name);
225 checkArgument(match.find(), "Package name '%s' does not match required pattern '%s'", name,
226 ROOT_PACKAGE_PATTERN_STRING);
227 return match.group(0);
230 @SuppressWarnings("checkstyle:illegalCatch")
231 public static QNameModule getQNameModule(final Class<?> clz) {
232 if (DataContainer.class.isAssignableFrom(clz) || BaseIdentity.class.isAssignableFrom(clz)) {
233 return findQName(clz).getModule();
236 return BindingReflections.getModuleInfo(clz).getName().getModule();
237 } catch (Exception e) {
238 throw new IllegalStateException("Unable to get QName of defining model.", e);
243 * Extract a QNameModule from YangModuleInfo.
245 * @param modInfo Module info
246 * @return QNameModule for the module
247 * @throws NullPointerException in modInfo is null
249 * @deprecated Use {@code YangModuleInfo.getName().getModule()} instead.
252 public static QNameModule getQNameModule(final YangModuleInfo modInfo) {
253 return modInfo.getName().getModule();
257 * Returns instance of {@link YangModuleInfo} of declaring model for specific class.
259 * @param cls data object class
260 * @return Instance of {@link YangModuleInfo} associated with model, from
261 * which this class was derived.
263 public static YangModuleInfo getModuleInfo(final Class<?> cls) throws Exception {
264 checkArgument(cls != null);
265 String packageName = getModelRootPackageName(cls.getPackage());
266 final String potentialClassName = getModuleInfoClassName(packageName);
267 return ClassLoaderUtils.withClassLoader(cls.getClassLoader(), (Callable<YangModuleInfo>) () -> {
268 Class<?> moduleInfoClass = Thread.currentThread().getContextClassLoader().loadClass(potentialClassName);
269 return (YangModuleInfo) moduleInfoClass.getMethod("getInstance").invoke(null);
273 public static String getModuleInfoClassName(final String packageName) {
274 return packageName + "." + BindingMapping.MODULE_INFO_CLASS_NAME;
278 * Check if supplied class is derived from YANG model.
282 * @return true if class is derived from YANG model.
284 public static boolean isBindingClass(final Class<?> cls) {
285 if (DataContainer.class.isAssignableFrom(cls) || Augmentation.class.isAssignableFrom(cls)) {
288 return cls.getName().startsWith(BindingMapping.PACKAGE_PREFIX);
292 * Checks if supplied method is callback for notifications.
294 * @param method method to check
295 * @return true if method is notification callback.
297 public static boolean isNotificationCallback(final Method method) {
298 checkArgument(method != null);
299 if (method.getName().startsWith("on") && method.getParameterTypes().length == 1) {
300 Class<?> potentialNotification = method.getParameterTypes()[0];
301 if (isNotification(potentialNotification)
302 && method.getName().equals("on" + potentialNotification.getSimpleName())) {
310 * Checks is supplied class is a {@link Notification}.
312 * @param potentialNotification class to examine
313 * @return True if the class represents a Notification.
315 public static boolean isNotification(final Class<?> potentialNotification) {
316 checkArgument(potentialNotification != null, "potentialNotification must not be null.");
317 return Notification.class.isAssignableFrom(potentialNotification);
321 * Loads {@link YangModuleInfo} infos available on current classloader. This method is shorthand for
322 * {@link #loadModuleInfos(ClassLoader)} with {@link Thread#getContextClassLoader()} for current thread.
324 * @return Set of {@link YangModuleInfo} available for current classloader.
326 public static ImmutableSet<YangModuleInfo> loadModuleInfos() {
327 return loadModuleInfos(Thread.currentThread().getContextClassLoader());
331 * Loads {@link YangModuleInfo} infos available on supplied classloader.
334 * {@link YangModuleInfo} are discovered using {@link ServiceLoader} for {@link YangModelBindingProvider}.
335 * {@link YangModelBindingProvider} are simple classes which holds only pointers to actual instance
336 * {@link YangModuleInfo}.
339 * When {@link YangModuleInfo} is available, all dependencies are recursively collected into returning set by
340 * collecting results of {@link YangModuleInfo#getImportedModules()}.
343 * Classloader for which {@link YangModuleInfo} should be
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();
359 private static void collectYangModuleInfo(final YangModuleInfo moduleInfo,
360 final Builder<YangModuleInfo> moduleInfoSet) {
361 moduleInfoSet.add(moduleInfo);
362 for (YangModuleInfo dependency : moduleInfo.getImportedModules()) {
363 collectYangModuleInfo(dependency, moduleInfoSet);
368 * Checks if supplied class represents RPC Input / RPC Output.
371 * Class to be checked
372 * @return true if class represents RPC Input or RPC Output class.
374 public static boolean isRpcType(final Class<? extends DataObject> targetType) {
375 return DataContainer.class.isAssignableFrom(targetType)
376 && !ChildOf.class.isAssignableFrom(targetType)
377 && !Notification.class.isAssignableFrom(targetType)
378 && (targetType.getName().endsWith("Input") || targetType.getName().endsWith("Output"));
382 * Scans supplied class and returns an iterable of all data children classes.
385 * YANG Modeled Entity derived from DataContainer
386 * @return Iterable of all data children, which have YANG modeled entity
388 @SuppressWarnings("unchecked")
389 public static Iterable<Class<? extends DataObject>> getChildrenClasses(final Class<? extends DataContainer> type) {
390 checkArgument(type != null, "Target type must not be null");
391 checkArgument(DataContainer.class.isAssignableFrom(type), "Supplied type must be derived from DataContainer");
392 List<Class<? extends DataObject>> ret = new LinkedList<>();
393 for (Method method : type.getMethods()) {
394 Optional<Class<? extends DataContainer>> entity = getYangModeledReturnType(method);
395 if (entity.isPresent()) {
396 ret.add((Class<? extends DataObject>) entity.get());
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 public static Map<Class<?>, Method> getChildrenClassToMethod(final Class<?> type) {
410 checkArgument(type != null, "Target type must not be null");
411 checkArgument(DataContainer.class.isAssignableFrom(type), "Supplied type must be derived from DataContainer");
412 Map<Class<?>, Method> ret = new HashMap<>();
413 for (Method method : type.getMethods()) {
414 Optional<Class<? extends DataContainer>> entity = getYangModeledReturnType(method);
415 if (entity.isPresent()) {
416 ret.put(entity.get(), method);
422 @SuppressWarnings({ "unchecked", "rawtypes", "checkstyle:illegalCatch" })
423 private static Optional<Class<? extends DataContainer>> getYangModeledReturnType(final Method method) {
424 if ("getClass".equals(method.getName()) || !method.getName().startsWith("get")
425 || method.getParameterTypes().length > 0) {
426 return Optional.absent();
429 Class returnType = method.getReturnType();
430 if (DataContainer.class.isAssignableFrom(returnType)) {
431 return Optional.of(returnType);
432 } else if (List.class.isAssignableFrom(returnType)) {
434 return ClassLoaderUtils.withClassLoader(method.getDeclaringClass().getClassLoader(),
435 (Callable<Optional<Class<? extends DataContainer>>>) () -> {
436 Type listResult = ClassLoaderUtils.getFirstGenericParameter(method.getGenericReturnType());
437 if (listResult instanceof Class
438 && DataContainer.class.isAssignableFrom((Class) listResult)) {
439 return Optional.of((Class) listResult);
441 return Optional.absent();
443 } catch (Exception e) {
445 * It is safe to log this this exception on debug, since this
446 * method should not fail. Only failures are possible if the
449 LOG.debug("Unable to find YANG modeled return type for {}", method, e);
452 return Optional.absent();
455 private static class ClassToQNameLoader extends CacheLoader<Class<?>, Optional<QName>> {
458 public Optional<QName> load(@SuppressWarnings("NullableProblems") final Class<?> key) throws Exception {
459 return resolveQNameNoCache(key);
463 * Tries to resolve QName for supplied class. Looks up for static field with name from constant
464 * {@link BindingMapping#QNAME_STATIC_FIELD_NAME} and returns value if present. If field is not present uses
465 * {@link #computeQName(Class)} to compute QName for missing types.
467 private static Optional<QName> resolveQNameNoCache(final Class<?> key) {
469 Field field = key.getField(BindingMapping.QNAME_STATIC_FIELD_NAME);
470 Object obj = field.get(null);
471 if (obj instanceof QName) {
472 return Optional.of((QName) obj);
475 } catch (NoSuchFieldException e) {
476 return Optional.of(computeQName(key));
478 } catch (SecurityException | IllegalArgumentException | IllegalAccessException e) {
481 * It is safe to log this this exception on debug, since this method
482 * should not fail. Only failures are possible if the runtime /
485 LOG.debug("Unexpected exception during extracting QName for {}", key, e);
487 return Optional.absent();
491 * Computes QName for supplied class. Namespace and revision are same as {@link YangModuleInfo} associated with
497 * <li>rpc input: local name is "input".
498 * <li>rpc output: local name is "output".
499 * <li>augmentation: local name is "module name".
503 * There is also fallback, if it is not possible to compute QName using following algorithm returns module
506 * @throws IllegalStateException If YangModuleInfo could not be resolved
507 * @throws IllegalArgumentException If supplied class was not derived from YANG model.
509 // FIXME: Extend this algorithm to also provide QName for YANG modeled simple types.
510 @SuppressWarnings({ "rawtypes", "unchecked", "checkstyle:illegalCatch" })
511 private static QName computeQName(final Class key) {
512 checkArgument(isBindingClass(key), "Supplied class %s is not derived from YANG.", key);
514 YangModuleInfo moduleInfo;
516 moduleInfo = getModuleInfo(key);
517 } catch (Exception e) {
518 throw new IllegalStateException("Unable to get QName for " + key + ". YangModuleInfo was not found.",
521 final QName module = moduleInfo.getName();
522 if (Augmentation.class.isAssignableFrom(key)) {
524 } else if (isRpcType(key)) {
525 final String className = key.getSimpleName();
526 if (className.endsWith(BindingMapping.RPC_OUTPUT_SUFFIX)) {
527 return YangConstants.operationOutputQName(module.getModule()).intern();
530 return YangConstants.operationInputQName(module.getModule()).intern();
534 * 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);