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;
12 import static com.google.common.base.Verify.verifyNotNull;
13 import static java.util.Objects.requireNonNull;
15 import com.google.common.annotations.Beta;
16 import com.google.common.cache.CacheBuilder;
17 import com.google.common.cache.CacheLoader;
18 import com.google.common.cache.LoadingCache;
19 import com.google.common.collect.ImmutableSet;
20 import com.google.common.collect.ImmutableSet.Builder;
21 import com.google.common.util.concurrent.ListenableFuture;
22 import java.lang.reflect.Field;
23 import java.lang.reflect.Method;
24 import java.lang.reflect.Modifier;
25 import java.lang.reflect.ParameterizedType;
26 import java.lang.reflect.Type;
27 import java.util.Arrays;
28 import java.util.HashMap;
29 import java.util.HashSet;
30 import java.util.LinkedList;
31 import java.util.List;
33 import java.util.Optional;
34 import java.util.ServiceLoader;
36 import java.util.concurrent.TimeUnit;
37 import java.util.regex.Matcher;
38 import java.util.regex.Pattern;
39 import org.checkerframework.checker.regex.qual.Regex;
40 import org.eclipse.jdt.annotation.NonNull;
41 import org.opendaylight.mdsal.binding.spec.naming.BindingMapping;
42 import org.opendaylight.yangtools.util.ClassLoaderUtils;
43 import org.opendaylight.yangtools.yang.binding.Action;
44 import org.opendaylight.yangtools.yang.binding.Augmentable;
45 import org.opendaylight.yangtools.yang.binding.Augmentation;
46 import org.opendaylight.yangtools.yang.binding.AugmentationHolder;
47 import org.opendaylight.yangtools.yang.binding.BaseIdentity;
48 import org.opendaylight.yangtools.yang.binding.ChildOf;
49 import org.opendaylight.yangtools.yang.binding.DataContainer;
50 import org.opendaylight.yangtools.yang.binding.DataObject;
51 import org.opendaylight.yangtools.yang.binding.Notification;
52 import org.opendaylight.yangtools.yang.binding.RpcService;
53 import org.opendaylight.yangtools.yang.binding.YangModelBindingProvider;
54 import org.opendaylight.yangtools.yang.binding.YangModuleInfo;
55 import org.opendaylight.yangtools.yang.common.QName;
56 import org.opendaylight.yangtools.yang.common.QNameModule;
57 import org.opendaylight.yangtools.yang.common.YangConstants;
58 import org.slf4j.Logger;
59 import org.slf4j.LoggerFactory;
61 public final class BindingReflections {
63 private static final long EXPIRATION_TIME = 60;
66 private static final String ROOT_PACKAGE_PATTERN_STRING =
67 "(org.opendaylight.yang.gen.v1.[a-z0-9_\\.]*\\.(?:rev[0-9][0-9][0-1][0-9][0-3][0-9]|norev))";
68 private static final Pattern ROOT_PACKAGE_PATTERN = Pattern.compile(ROOT_PACKAGE_PATTERN_STRING);
69 private static final Logger LOG = LoggerFactory.getLogger(BindingReflections.class);
71 private static final LoadingCache<Class<?>, Optional<QName>> CLASS_TO_QNAME = CacheBuilder.newBuilder()
73 .expireAfterAccess(EXPIRATION_TIME, TimeUnit.SECONDS)
74 .build(new ClassToQNameLoader());
76 private static final LoadingCache<ClassLoader, ImmutableSet<YangModuleInfo>> MODULE_INFO_CACHE =
77 CacheBuilder.newBuilder().weakKeys().weakValues().build(
78 new CacheLoader<ClassLoader, ImmutableSet<YangModuleInfo>>() {
80 public ImmutableSet<YangModuleInfo> load(final ClassLoader key) {
81 return loadModuleInfos(key);
85 private BindingReflections() {
90 * Find augmentation target class from concrete Augmentation class. This method uses first generic argument of
91 * implemented {@link Augmentation} interface.
94 * {@link Augmentation} subclass for which we want to determine
95 * augmentation target.
96 * @return Augmentation target - class which augmentation provides additional extensions.
98 public static Class<? extends Augmentable<?>> findAugmentationTarget(
99 final Class<? extends Augmentation<?>> augmentation) {
100 final Optional<Class<Augmentable<?>>> opt = ClassLoaderUtils.findFirstGenericArgument(augmentation,
102 return opt.orElse(null);
106 * Find data hierarchy parent from concrete Data class. This method uses first generic argument of implemented
107 * {@link ChildOf} interface.
110 * child class for which we want to find the parent class.
111 * @return Parent class, e.g. class of which the childClass is ChildOf.
113 public static Class<?> findHierarchicalParent(final Class<? extends ChildOf<?>> childClass) {
114 return ClassLoaderUtils.findFirstGenericArgument(childClass, ChildOf.class).orElse(null);
118 * Find data hierarchy parent from concrete Data class. This method is shorthand which gets DataObject class by
119 * invoking {@link DataObject#implementedInterface()} and uses {@link #findHierarchicalParent(Class)}.
122 * Child object for which the parent needs to be located.
123 * @return Parent class, or null if a parent is not found.
125 public static Class<?> findHierarchicalParent(final DataObject child) {
126 if (child instanceof ChildOf) {
127 return ClassLoaderUtils.findFirstGenericArgument(child.implementedInterface(), ChildOf.class).orElse(null);
133 * Returns a QName associated to supplied type.
135 * @param dataType Data type class
136 * @return QName associated to supplied dataType. If dataType is Augmentation method does not return canonical
137 * QName, but QName with correct namespace revision, but virtual local name, since augmentations do not
138 * have name. May return null if QName is not present.
140 public static QName findQName(final Class<?> dataType) {
141 return CLASS_TO_QNAME.getUnchecked(dataType).orElse(null);
145 * Checks if method is RPC invocation.
147 * @param possibleMethod
149 * @return true if method is RPC invocation, false otherwise.
151 public static boolean isRpcMethod(final Method possibleMethod) {
152 return possibleMethod != null && RpcService.class.isAssignableFrom(possibleMethod.getDeclaringClass())
153 && ListenableFuture.class.isAssignableFrom(possibleMethod.getReturnType())
154 // length <= 2: it seemed to be impossible to get correct RpcMethodInvoker because of
155 // resolveRpcInputClass() check.While RpcMethodInvoker counts with one argument for
156 // non input type and two arguments for input type, resolveRpcInputClass() counting
157 // with zero for non input and one for input type
158 && possibleMethod.getParameterCount() <= 2;
162 * Extracts Output class for RPC method.
164 * @param targetMethod
166 * @return Optional.empty() if result type could not be get, or return type is Void.
168 @SuppressWarnings("rawtypes")
169 public static Optional<Class<?>> resolveRpcOutputClass(final Method targetMethod) {
170 checkState(isRpcMethod(targetMethod), "Supplied method is not a RPC invocation method");
171 Type futureType = targetMethod.getGenericReturnType();
172 Type rpcResultType = ClassLoaderUtils.getFirstGenericParameter(futureType).orElse(null);
173 Type rpcResultArgument = ClassLoaderUtils.getFirstGenericParameter(rpcResultType).orElse(null);
174 if (rpcResultArgument instanceof Class && !Void.class.equals(rpcResultArgument)) {
175 return Optional.of((Class) rpcResultArgument);
177 return Optional.empty();
181 * Extracts input class for RPC method.
183 * @param targetMethod
185 * @return Optional.empty() if RPC has no input, RPC input type otherwise.
187 @SuppressWarnings("rawtypes")
188 public static Optional<Class<? extends DataContainer>> resolveRpcInputClass(final Method targetMethod) {
189 for (Class clazz : targetMethod.getParameterTypes()) {
190 if (DataContainer.class.isAssignableFrom(clazz)) {
191 return Optional.of(clazz);
194 return Optional.empty();
197 public static @NonNull QName getQName(final Class<? extends BaseIdentity> bindingClass) {
198 final Optional<QName> qname = CLASS_TO_QNAME.getUnchecked(requireNonNull(bindingClass));
199 checkState(qname.isPresent(), "Failed to resolve QName of %s", bindingClass);
204 * Checks if class is child of augmentation.
206 public static boolean isAugmentationChild(final Class<?> clazz) {
207 // FIXME: Current resolver could be still confused when child node was added by grouping
208 checkArgument(clazz != null);
210 @SuppressWarnings({ "rawtypes", "unchecked" })
211 Class<?> parent = findHierarchicalParent((Class) clazz);
212 if (parent == null) {
213 LOG.debug("Did not find a parent for class {}", clazz);
217 String clazzModelPackage = getModelRootPackageName(clazz.getPackage());
218 String parentModelPackage = getModelRootPackageName(parent.getPackage());
220 return !clazzModelPackage.equals(parentModelPackage);
224 * Returns root package name for supplied package.
227 * Package for which find model root package.
228 * @return Package of model root.
230 public static String getModelRootPackageName(final Package pkg) {
231 return getModelRootPackageName(pkg.getName());
235 * Returns root package name for supplied package name.
238 * Package for which find model root package.
239 * @return Package of model root.
241 public static String getModelRootPackageName(final String name) {
242 checkArgument(name != null, "Package name should not be null.");
243 checkArgument(name.startsWith(BindingMapping.PACKAGE_PREFIX), "Package name not starting with %s, is: %s",
244 BindingMapping.PACKAGE_PREFIX, name);
245 Matcher match = ROOT_PACKAGE_PATTERN.matcher(name);
246 checkArgument(match.find(), "Package name '%s' does not match required pattern '%s'", name,
247 ROOT_PACKAGE_PATTERN_STRING);
248 return match.group(0);
251 @SuppressWarnings("checkstyle:illegalCatch")
252 public static QNameModule getQNameModule(final Class<?> clz) {
253 if (DataContainer.class.isAssignableFrom(clz) || BaseIdentity.class.isAssignableFrom(clz)
254 || Action.class.isAssignableFrom(clz)) {
255 return findQName(clz).getModule();
258 return BindingReflections.getModuleInfo(clz).getName().getModule();
259 } catch (Exception e) {
260 throw new IllegalStateException("Unable to get QName of defining model.", e);
265 * Returns instance of {@link YangModuleInfo} of declaring model for specific class.
267 * @param cls data object class
268 * @return Instance of {@link YangModuleInfo} associated with model, from
269 * which this class was derived.
271 public static @NonNull YangModuleInfo getModuleInfo(final Class<?> cls) throws Exception {
272 checkArgument(cls != null);
273 String packageName = getModelRootPackageName(cls.getPackage());
274 final String potentialClassName = getModuleInfoClassName(packageName);
275 return ClassLoaderUtils.callWithClassLoader(cls.getClassLoader(), () -> {
276 Class<?> moduleInfoClass = Thread.currentThread().getContextClassLoader().loadClass(potentialClassName);
277 return (YangModuleInfo) verifyNotNull(moduleInfoClass.getMethod("getInstance").invoke(null));
281 public static @NonNull String getModuleInfoClassName(final String packageName) {
282 return packageName + "." + BindingMapping.MODULE_INFO_CLASS_NAME;
286 * Check if supplied class is derived from YANG model.
290 * @return true if class is derived from YANG model.
292 public static boolean isBindingClass(final Class<?> cls) {
293 if (DataContainer.class.isAssignableFrom(cls) || Augmentation.class.isAssignableFrom(cls)) {
296 return cls.getName().startsWith(BindingMapping.PACKAGE_PREFIX);
300 * Checks if supplied method is callback for notifications.
302 * @param method method to check
303 * @return true if method is notification callback.
305 public static boolean isNotificationCallback(final Method method) {
306 checkArgument(method != null);
307 if (method.getName().startsWith("on") && method.getParameterCount() == 1) {
308 Class<?> potentialNotification = method.getParameterTypes()[0];
309 if (isNotification(potentialNotification)
310 && method.getName().equals("on" + potentialNotification.getSimpleName())) {
318 * Checks is supplied class is a {@link Notification}.
320 * @param potentialNotification class to examine
321 * @return True if the class represents a Notification.
323 public static boolean isNotification(final Class<?> potentialNotification) {
324 checkArgument(potentialNotification != null, "potentialNotification must not be null.");
325 return Notification.class.isAssignableFrom(potentialNotification);
329 * Loads {@link YangModuleInfo} infos available on current classloader. This method is shorthand for
330 * {@link #loadModuleInfos(ClassLoader)} with {@link Thread#getContextClassLoader()} for current thread.
332 * @return Set of {@link YangModuleInfo} available for current classloader.
334 public static @NonNull ImmutableSet<YangModuleInfo> loadModuleInfos() {
335 return loadModuleInfos(Thread.currentThread().getContextClassLoader());
339 * Loads {@link YangModuleInfo} infos available on supplied classloader.
342 * {@link YangModuleInfo} are discovered using {@link ServiceLoader} for {@link YangModelBindingProvider}.
343 * {@link YangModelBindingProvider} are simple classes which holds only pointers to actual instance
344 * {@link YangModuleInfo}.
347 * When {@link YangModuleInfo} is available, all dependencies are recursively collected into returning set by
348 * collecting results of {@link YangModuleInfo#getImportedModules()}.
351 * Consider using {@link #cacheModuleInfos(ClassLoader)} if the classloader is known to be immutable.
353 * @param loader Classloader for which {@link YangModuleInfo} should be retrieved.
354 * @return Set of {@link YangModuleInfo} available for supplied classloader.
356 public static @NonNull ImmutableSet<YangModuleInfo> loadModuleInfos(final ClassLoader loader) {
357 Builder<YangModuleInfo> moduleInfoSet = ImmutableSet.builder();
358 ServiceLoader<YangModelBindingProvider> serviceLoader = ServiceLoader.load(YangModelBindingProvider.class,
360 for (YangModelBindingProvider bindingProvider : serviceLoader) {
361 YangModuleInfo moduleInfo = bindingProvider.getModuleInfo();
362 checkState(moduleInfo != null, "Module Info for %s is not available.", bindingProvider.getClass());
363 collectYangModuleInfo(bindingProvider.getModuleInfo(), moduleInfoSet);
365 return moduleInfoSet.build();
369 * Loads {@link YangModuleInfo} instances available on supplied {@link ClassLoader}, assuming the set of available
370 * information does not change. Subsequent accesses may return cached values.
373 * {@link YangModuleInfo} are discovered using {@link ServiceLoader} for {@link YangModelBindingProvider}.
374 * {@link YangModelBindingProvider} are simple classes which holds only pointers to actual instance
375 * {@link YangModuleInfo}.
378 * When {@link YangModuleInfo} is available, all dependencies are recursively collected into returning set by
379 * collecting results of {@link YangModuleInfo#getImportedModules()}.
381 * @param loader Class loader for which {@link YangModuleInfo} should be retrieved.
382 * @return Set of {@link YangModuleInfo} available for supplied classloader.
385 public static @NonNull ImmutableSet<YangModuleInfo> cacheModuleInfos(final ClassLoader loader) {
386 return MODULE_INFO_CACHE.getUnchecked(loader);
389 private static void collectYangModuleInfo(final YangModuleInfo moduleInfo,
390 final Builder<YangModuleInfo> moduleInfoSet) {
391 moduleInfoSet.add(moduleInfo);
392 for (YangModuleInfo dependency : moduleInfo.getImportedModules()) {
393 collectYangModuleInfo(dependency, moduleInfoSet);
398 * Checks if supplied class represents RPC Input / RPC Output.
401 * Class to be checked
402 * @return true if class represents RPC Input or RPC Output class.
404 public static boolean isRpcType(final Class<? extends DataObject> targetType) {
405 return DataContainer.class.isAssignableFrom(targetType)
406 && !ChildOf.class.isAssignableFrom(targetType)
407 && !Notification.class.isAssignableFrom(targetType)
408 && (targetType.getName().endsWith("Input") || targetType.getName().endsWith("Output"));
412 * Scans supplied class and returns an iterable of all data children classes.
415 * YANG Modeled Entity derived from DataContainer
416 * @return Iterable of all data children, which have YANG modeled entity
418 @SuppressWarnings("unchecked")
419 public static Iterable<Class<? extends DataObject>> getChildrenClasses(final Class<? extends DataContainer> type) {
420 checkArgument(type != null, "Target type must not be null");
421 checkArgument(DataContainer.class.isAssignableFrom(type), "Supplied type must be derived from DataContainer");
422 List<Class<? extends DataObject>> ret = new LinkedList<>();
423 for (Method method : type.getMethods()) {
424 Optional<Class<? extends DataContainer>> entity = getYangModeledReturnType(method,
425 BindingMapping.GETTER_PREFIX);
426 if (entity.isPresent()) {
427 ret.add((Class<? extends DataObject>) entity.get());
434 * Scans supplied class and returns an iterable of all data children classes.
437 * YANG Modeled Entity derived from DataContainer
438 * @return Iterable of all data children, which have YANG modeled entity
440 public static Map<Class<?>, Method> getChildrenClassToMethod(final Class<?> type) {
441 return getChildrenClassToMethod(type, BindingMapping.GETTER_PREFIX);
444 private static Map<Class<?>, Method> getChildrenClassToMethod(final Class<?> type, final String prefix) {
445 checkArgument(type != null, "Target type must not be null");
446 checkArgument(DataContainer.class.isAssignableFrom(type), "Supplied type %s must be derived from DataContainer",
448 Map<Class<?>, Method> ret = new HashMap<>();
449 for (Method method : type.getMethods()) {
450 Optional<Class<? extends DataContainer>> entity = getYangModeledReturnType(method, prefix);
451 if (entity.isPresent()) {
452 ret.put(entity.get(), method);
459 public static Map<Class<?>, Method> getChildrenClassToNonnullMethod(final Class<?> type) {
460 return getChildrenClassToMethod(type, BindingMapping.NONNULL_PREFIX);
463 private static Optional<Class<? extends DataContainer>> getYangModeledReturnType(final Method method,
464 final String prefix) {
465 final String methodName = method.getName();
466 if ("getClass".equals(methodName) || !methodName.startsWith(prefix) || method.getParameterCount() > 0) {
467 return Optional.empty();
470 final Class<?> returnType = method.getReturnType();
471 if (DataContainer.class.isAssignableFrom(returnType)) {
472 return optionalDataContainer(returnType);
473 } else if (List.class.isAssignableFrom(returnType)) {
474 return getYangModeledReturnType(method, 0);
475 } else if (Map.class.isAssignableFrom(returnType)) {
476 return getYangModeledReturnType(method, 1);
478 return Optional.empty();
481 @SuppressWarnings("checkstyle:illegalCatch")
482 private static Optional<Class<? extends DataContainer>> getYangModeledReturnType(final Method method,
483 final int parameterOffset) {
485 return ClassLoaderUtils.callWithClassLoader(method.getDeclaringClass().getClassLoader(), () -> {
486 return genericParameter(method.getGenericReturnType(), parameterOffset).flatMap(
487 result -> result instanceof Class ? optionalCast((Class<?>) result) : Optional.empty());
489 } catch (Exception e) {
491 * It is safe to log this this exception on debug, since this
492 * method should not fail. Only failures are possible if the
495 LOG.debug("Unable to find YANG modeled return type for {}", method, e);
497 return Optional.empty();
500 private static Optional<Class<? extends DataContainer>> optionalCast(final Class<?> type) {
501 return DataContainer.class.isAssignableFrom(type) ? optionalDataContainer(type) : Optional.empty();
504 private static Optional<Class<? extends DataContainer>> optionalDataContainer(final Class<?> type) {
505 return Optional.of(type.asSubclass(DataContainer.class));
508 private static Optional<Type> genericParameter(final Type type, final int offset) {
509 if (type instanceof ParameterizedType) {
510 final Type[] parameters = ((ParameterizedType) type).getActualTypeArguments();
511 if (parameters.length > offset) {
512 return Optional.of(parameters[offset]);
515 return Optional.empty();
518 private static class ClassToQNameLoader extends CacheLoader<Class<?>, Optional<QName>> {
521 public Optional<QName> load(@SuppressWarnings("NullableProblems") final Class<?> key) throws Exception {
522 return resolveQNameNoCache(key);
526 * Tries to resolve QName for supplied class. Looks up for static field with name from constant
527 * {@link BindingMapping#QNAME_STATIC_FIELD_NAME} and returns value if present. If field is not present uses
528 * {@link #computeQName(Class)} to compute QName for missing types.
530 private static Optional<QName> resolveQNameNoCache(final Class<?> key) {
534 field = key.getField(BindingMapping.QNAME_STATIC_FIELD_NAME);
535 } catch (NoSuchFieldException e) {
536 LOG.debug("{} does not have a {} field, falling back to computation", key,
537 BindingMapping.QNAME_STATIC_FIELD_NAME, e);
538 return Optional.of(computeQName(key));
541 final Object obj = field.get(null);
542 if (obj instanceof QName) {
543 return Optional.of((QName) obj);
545 } catch (SecurityException | IllegalArgumentException | IllegalAccessException e) {
547 * It is safe to log this this exception on debug, since this method should not fail. Only failures are
548 * possible if the runtime / backing is inconsistent.
550 LOG.debug("Unexpected exception during extracting QName for {}", key, e);
552 return Optional.empty();
556 * Computes QName for supplied class. Namespace and revision are same as {@link YangModuleInfo} associated with
562 * <li>rpc input: local name is "input".
563 * <li>rpc output: local name is "output".
564 * <li>augmentation: local name is "module name".
568 * There is also fallback, if it is not possible to compute QName using following algorithm returns module
571 * @throws IllegalStateException If YangModuleInfo could not be resolved
572 * @throws IllegalArgumentException If supplied class was not derived from YANG model.
574 // FIXME: Extend this algorithm to also provide QName for YANG modeled simple types.
575 @SuppressWarnings({ "rawtypes", "unchecked", "checkstyle:illegalCatch" })
576 private static QName computeQName(final Class key) {
577 checkArgument(isBindingClass(key), "Supplied class %s is not derived from YANG.", key);
579 YangModuleInfo moduleInfo;
581 moduleInfo = getModuleInfo(key);
582 } catch (Exception e) {
583 throw new IllegalStateException("Unable to get QName for " + key + ". YangModuleInfo was not found.",
586 final QName module = moduleInfo.getName();
587 if (Augmentation.class.isAssignableFrom(key)) {
589 } else if (isRpcType(key)) {
590 final String className = key.getSimpleName();
591 if (className.endsWith(BindingMapping.RPC_OUTPUT_SUFFIX)) {
592 return YangConstants.operationOutputQName(module.getModule()).intern();
595 return YangConstants.operationInputQName(module.getModule()).intern();
599 * Fallback for Binding types which do not have QNAME field
606 * Extracts augmentation from Binding DTO field using reflection.
609 * Instance of DataObject which is augmentable and may contain
611 * @return Map of augmentations if read was successful, otherwise empty map.
613 public static Map<Class<? extends Augmentation<?>>, Augmentation<?>> getAugmentations(final Augmentable<?> input) {
614 if (input instanceof AugmentationHolder) {
615 return ((AugmentationHolder) input).augmentations();
617 return AugmentationFieldGetter.getGetter(input.getClass()).getAugmentations(input);
621 * Determines if two augmentation classes or case classes represents same
625 * Two augmentations or cases could be substituted only if and if:
627 * <li>Both implements same interfaces</li>
628 * <li>Both have same children</li>
629 * <li>If augmentations: Both have same augmentation target class. Target
630 * class was generated for data node in grouping.</li>
631 * <li>If cases: Both are from same choice. Choice class was generated for
632 * data node in grouping.</li>
636 * <b>Explanation:</b> Binding Specification reuses classes generated for
637 * groupings as part of normal data tree, this classes from grouping could
638 * be used at various locations and user may not be aware of it and may use
639 * incorrect case or augmentation in particular subtree (via copy
640 * constructors, etc).
643 * Class which is potential substitution
645 * Class which should be used at particular subtree
646 * @return true if and only if classes represents same data.
648 @SuppressWarnings({ "rawtypes", "unchecked" })
649 public static boolean isSubstitutionFor(final Class potential, final Class target) {
650 Set<Class> subImplemented = new HashSet<>(Arrays.asList(potential.getInterfaces()));
651 Set<Class> targetImplemented = new HashSet<>(Arrays.asList(target.getInterfaces()));
652 if (!subImplemented.equals(targetImplemented)) {
655 if (Augmentation.class.isAssignableFrom(potential)
656 && !BindingReflections.findAugmentationTarget(potential).equals(
657 BindingReflections.findAugmentationTarget(target))) {
660 for (Method potentialMethod : potential.getMethods()) {
661 if (Modifier.isStatic(potentialMethod.getModifiers())) {
662 // Skip any static methods, as we are not interested in those
667 Method targetMethod = target.getMethod(potentialMethod.getName(), potentialMethod.getParameterTypes());
668 if (!potentialMethod.getReturnType().equals(targetMethod.getReturnType())) {
671 } catch (NoSuchMethodException e) {
672 // Counterpart method is missing, so classes could not be substituted.
674 } catch (SecurityException e) {
675 throw new IllegalStateException("Could not compare methods", e);