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/*
 * Copyright 2002-2019 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.util;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.UndeclaredThrowableException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

import org.springframework.lang.Nullable;

/**
 * Simple utility class for working with the reflection API and handling
 * reflection exceptions.
 *
 * 

Only intended for internal use. * * @author Juergen Hoeller * @author Rob Harrop * @author Rod Johnson * @author Costin Leau * @author Sam Brannen * @author Chris Beams * @since 1.2.2 */ public abstract class ReflectionUtils { /** * Pre-built MethodFilter that matches all non-bridge non-synthetic methods * which are not declared on {@code java.lang.Object}. * @since 3.0.5 */ public static final MethodFilter USER_DECLARED_METHODS = (method -> !method.isBridge() && !method.isSynthetic()); /** * Pre-built FieldFilter that matches all non-static, non-final fields. */ public static final FieldFilter COPYABLE_FIELDS = (field -> !(Modifier.isStatic(field.getModifiers()) || Modifier.isFinal(field.getModifiers()))); /** * Naming prefix for CGLIB-renamed methods. * @see #isCglibRenamedMethod */ private static final String CGLIB_RENAMED_METHOD_PREFIX = "CGLIB$"; private static final Class[] EMPTY_CLASS_ARRAY = new Class[0]; private static final Method[] EMPTY_METHOD_ARRAY = new Method[0]; private static final Field[] EMPTY_FIELD_ARRAY = new Field[0]; private static final Object[] EMPTY_OBJECT_ARRAY = new Object[0]; /** * Cache for {@link Class#getDeclaredMethods()} plus equivalent default methods * from Java 8 based interfaces, allowing for fast iteration. */ private static final Map, Method[]> declaredMethodsCache = new ConcurrentReferenceHashMap<>(256); /** * Cache for {@link Class#getDeclaredFields()}, allowing for fast iteration. */ private static final Map, Field[]> declaredFieldsCache = new ConcurrentReferenceHashMap<>(256); // Exception handling /** * Handle the given reflection exception. *

Should only be called if no checked exception is expected to be thrown * by a target method, or if an error occurs while accessing a method or field. *

Throws the underlying RuntimeException or Error in case of an * InvocationTargetException with such a root cause. Throws an * IllegalStateException with an appropriate message or * UndeclaredThrowableException otherwise. * @param ex the reflection exception to handle */ public static void handleReflectionException(Exception ex) { if (ex instanceof NoSuchMethodException) { throw new IllegalStateException("Method not found: " + ex.getMessage()); } if (ex instanceof IllegalAccessException) { throw new IllegalStateException("Could not access method or field: " + ex.getMessage()); } if (ex instanceof InvocationTargetException) { handleInvocationTargetException((InvocationTargetException) ex); } if (ex instanceof RuntimeException) { throw (RuntimeException) ex; } throw new UndeclaredThrowableException(ex); } /** * Handle the given invocation target exception. Should only be called if no * checked exception is expected to be thrown by the target method. *

Throws the underlying RuntimeException or Error in case of such a root * cause. Throws an UndeclaredThrowableException otherwise. * @param ex the invocation target exception to handle */ public static void handleInvocationTargetException(InvocationTargetException ex) { rethrowRuntimeException(ex.getTargetException()); } /** * Rethrow the given {@link Throwable exception}, which is presumably the * target exception of an {@link InvocationTargetException}. * Should only be called if no checked exception is expected to be thrown * by the target method. *

Rethrows the underlying exception cast to a {@link RuntimeException} or * {@link Error} if appropriate; otherwise, throws an * {@link UndeclaredThrowableException}. * @param ex the exception to rethrow * @throws RuntimeException the rethrown exception */ public static void rethrowRuntimeException(Throwable ex) { if (ex instanceof RuntimeException) { throw (RuntimeException) ex; } if (ex instanceof Error) { throw (Error) ex; } throw new UndeclaredThrowableException(ex); } /** * Rethrow the given {@link Throwable exception}, which is presumably the * target exception of an {@link InvocationTargetException}. * Should only be called if no checked exception is expected to be thrown * by the target method. *

Rethrows the underlying exception cast to an {@link Exception} or * {@link Error} if appropriate; otherwise, throws an * {@link UndeclaredThrowableException}. * @param ex the exception to rethrow * @throws Exception the rethrown exception (in case of a checked exception) */ public static void rethrowException(Throwable ex) throws Exception { if (ex instanceof Exception) { throw (Exception) ex; } if (ex instanceof Error) { throw (Error) ex; } throw new UndeclaredThrowableException(ex); } // Constructor handling /** * Obtain an accessible constructor for the given class and parameters. * @param clazz the clazz to check * @param parameterTypes the parameter types of the desired constructor * @return the constructor reference * @throws NoSuchMethodException if no such constructor exists * @since 5.0 */ public static Constructor accessibleConstructor(Class clazz, Class... parameterTypes) throws NoSuchMethodException { Constructor ctor = clazz.getDeclaredConstructor(parameterTypes); makeAccessible(ctor); return ctor; } /** * Make the given constructor accessible, explicitly setting it accessible * if necessary. The {@code setAccessible(true)} method is only called * when actually necessary, to avoid unnecessary conflicts with a JVM * SecurityManager (if active). * @param ctor the constructor to make accessible * @see java.lang.reflect.Constructor#setAccessible */ @SuppressWarnings("deprecation") // on JDK 9 public static void makeAccessible(Constructor ctor) { if ((!Modifier.isPublic(ctor.getModifiers()) || !Modifier.isPublic(ctor.getDeclaringClass().getModifiers())) && !ctor.isAccessible()) { ctor.setAccessible(true); } } // Method handling /** * Attempt to find a {@link Method} on the supplied class with the supplied name * and no parameters. Searches all superclasses up to {@code Object}. *

Returns {@code null} if no {@link Method} can be found. * @param clazz the class to introspect * @param name the name of the method * @return the Method object, or {@code null} if none found */ @Nullable public static Method findMethod(Class clazz, String name) { return findMethod(clazz, name, EMPTY_CLASS_ARRAY); } /** * Attempt to find a {@link Method} on the supplied class with the supplied name * and parameter types. Searches all superclasses up to {@code Object}. *

Returns {@code null} if no {@link Method} can be found. * @param clazz the class to introspect * @param name the name of the method * @param paramTypes the parameter types of the method * (may be {@code null} to indicate any signature) * @return the Method object, or {@code null} if none found */ @Nullable public static Method findMethod(Class clazz, String name, @Nullable Class... paramTypes) { Assert.notNull(clazz, "Class must not be null"); Assert.notNull(name, "Method name must not be null"); Class searchType = clazz; while (searchType != null) { Method[] methods = searchType.isInterface() ? searchType.getMethods() : getDeclaredMethods(searchType, false); for (Method method : methods) { if (name.equals(method.getName()) && (paramTypes == null || Arrays.equals(paramTypes, method.getParameterTypes()))) { return method; } } searchType = searchType.getSuperclass(); } return null; } /** * Invoke the specified {@link Method} against the supplied target object with no arguments. * The target object can be {@code null} when invoking a static {@link Method}. *

Thrown exceptions are handled via a call to {@link #handleReflectionException}. * @param method the method to invoke * @param target the target object to invoke the method on * @return the invocation result, if any * @see #invokeMethod(java.lang.reflect.Method, Object, Object[]) */ @Nullable public static Object invokeMethod(Method method, @Nullable Object target) { return invokeMethod(method, target, EMPTY_OBJECT_ARRAY); } /** * Invoke the specified {@link Method} against the supplied target object with the * supplied arguments. The target object can be {@code null} when invoking a * static {@link Method}. *

Thrown exceptions are handled via a call to {@link #handleReflectionException}. * @param method the method to invoke * @param target the target object to invoke the method on * @param args the invocation arguments (may be {@code null}) * @return the invocation result, if any */ @Nullable public static Object invokeMethod(Method method, @Nullable Object target, @Nullable Object... args) { try { return method.invoke(target, args); } catch (Exception ex) { handleReflectionException(ex); } throw new IllegalStateException("Should never get here"); } /** * Determine whether the given method explicitly declares the given * exception or one of its superclasses, which means that an exception * of that type can be propagated as-is within a reflective invocation. * @param method the declaring method * @param exceptionType the exception to throw * @return {@code true} if the exception can be thrown as-is; * {@code false} if it needs to be wrapped */ public static boolean declaresException(Method method, Class exceptionType) { Assert.notNull(method, "Method must not be null"); Class[] declaredExceptions = method.getExceptionTypes(); for (Class declaredException : declaredExceptions) { if (declaredException.isAssignableFrom(exceptionType)) { return true; } } return false; } /** * Perform the given callback operation on all matching methods of the given * class, as locally declared or equivalent thereof (such as default methods * on Java 8 based interfaces that the given class implements). * @param clazz the class to introspect * @param mc the callback to invoke for each method * @throws IllegalStateException if introspection fails * @since 4.2 * @see #doWithMethods */ public static void doWithLocalMethods(Class clazz, MethodCallback mc) { Method[] methods = getDeclaredMethods(clazz, false); for (Method method : methods) { try { mc.doWith(method); } catch (IllegalAccessException ex) { throw new IllegalStateException("Not allowed to access method '" + method.getName() + "': " + ex); } } } /** * Perform the given callback operation on all matching methods of the given * class and superclasses. *

The same named method occurring on subclass and superclass will appear * twice, unless excluded by a {@link MethodFilter}. * @param clazz the class to introspect * @param mc the callback to invoke for each method * @throws IllegalStateException if introspection fails * @see #doWithMethods(Class, MethodCallback, MethodFilter) */ public static void doWithMethods(Class clazz, MethodCallback mc) { doWithMethods(clazz, mc, null); } /** * Perform the given callback operation on all matching methods of the given * class and superclasses (or given interface and super-interfaces). *

The same named method occurring on subclass and superclass will appear * twice, unless excluded by the specified {@link MethodFilter}. * @param clazz the class to introspect * @param mc the callback to invoke for each method * @param mf the filter that determines the methods to apply the callback to * @throws IllegalStateException if introspection fails */ public static void doWithMethods(Class clazz, MethodCallback mc, @Nullable MethodFilter mf) { // Keep backing up the inheritance hierarchy. Method[] methods = getDeclaredMethods(clazz, false); for (Method method : methods) { if (mf != null && !mf.matches(method)) { continue; } try { mc.doWith(method); } catch (IllegalAccessException ex) { throw new IllegalStateException("Not allowed to access method '" + method.getName() + "': " + ex); } } if (clazz.getSuperclass() != null && (mf != USER_DECLARED_METHODS || clazz.getSuperclass() != Object.class)) { doWithMethods(clazz.getSuperclass(), mc, mf); } else if (clazz.isInterface()) { for (Class superIfc : clazz.getInterfaces()) { doWithMethods(superIfc, mc, mf); } } } /** * Get all declared methods on the leaf class and all superclasses. * Leaf class methods are included first. * @param leafClass the class to introspect * @throws IllegalStateException if introspection fails */ public static Method[] getAllDeclaredMethods(Class leafClass) { final List methods = new ArrayList<>(32); doWithMethods(leafClass, methods::add); return methods.toArray(EMPTY_METHOD_ARRAY); } /** * Get the unique set of declared methods on the leaf class and all superclasses. * Leaf class methods are included first and while traversing the superclass hierarchy * any methods found with signatures matching a method already included are filtered out. * @param leafClass the class to introspect * @throws IllegalStateException if introspection fails */ public static Method[] getUniqueDeclaredMethods(Class leafClass) { return getUniqueDeclaredMethods(leafClass, null); } /** * Get the unique set of declared methods on the leaf class and all superclasses. * Leaf class methods are included first and while traversing the superclass hierarchy * any methods found with signatures matching a method already included are filtered out. * @param leafClass the class to introspect * @param mf the filter that determines the methods to take into account * @throws IllegalStateException if introspection fails * @since 5.2 */ public static Method[] getUniqueDeclaredMethods(Class leafClass, @Nullable MethodFilter mf) { final List methods = new ArrayList<>(32); doWithMethods(leafClass, method -> { boolean knownSignature = false; Method methodBeingOverriddenWithCovariantReturnType = null; for (Method existingMethod : methods) { if (method.getName().equals(existingMethod.getName()) && Arrays.equals(method.getParameterTypes(), existingMethod.getParameterTypes())) { // Is this a covariant return type situation? if (existingMethod.getReturnType() != method.getReturnType() && existingMethod.getReturnType().isAssignableFrom(method.getReturnType())) { methodBeingOverriddenWithCovariantReturnType = existingMethod; } else { knownSignature = true; } break; } } if (methodBeingOverriddenWithCovariantReturnType != null) { methods.remove(methodBeingOverriddenWithCovariantReturnType); } if (!knownSignature && !isCglibRenamedMethod(method)) { methods.add(method); } }, mf); return methods.toArray(EMPTY_METHOD_ARRAY); } /** * Variant of {@link Class#getDeclaredMethods()} that uses a local cache in * order to avoid the JVM's SecurityManager check and new Method instances. * In addition, it also includes Java 8 default methods from locally * implemented interfaces, since those are effectively to be treated just * like declared methods. * @param clazz the class to introspect * @return the cached array of methods * @throws IllegalStateException if introspection fails * @since 5.2 * @see Class#getDeclaredMethods() */ public static Method[] getDeclaredMethods(Class clazz) { return getDeclaredMethods(clazz, true); } private static Method[] getDeclaredMethods(Class clazz, boolean defensive) { Assert.notNull(clazz, "Class must not be null"); Method[] result = declaredMethodsCache.get(clazz); if (result == null) { try { Method[] declaredMethods = clazz.getDeclaredMethods(); List defaultMethods = findConcreteMethodsOnInterfaces(clazz); if (defaultMethods != null) { result = new Method[declaredMethods.length + defaultMethods.size()]; System.arraycopy(declaredMethods, 0, result, 0, declaredMethods.length); int index = declaredMethods.length; for (Method defaultMethod : defaultMethods) { result[index] = defaultMethod; index++; } } else { result = declaredMethods; } declaredMethodsCache.put(clazz, (result.length == 0 ? EMPTY_METHOD_ARRAY : result)); } catch (Throwable ex) { throw new IllegalStateException("Failed to introspect Class [" + clazz.getName() + "] from ClassLoader [" + clazz.getClassLoader() + "]", ex); } } return (result.length == 0 || !defensive) ? result : result.clone(); } @Nullable private static List findConcreteMethodsOnInterfaces(Class clazz) { List result = null; for (Class ifc : clazz.getInterfaces()) { for (Method ifcMethod : ifc.getMethods()) { if (!Modifier.isAbstract(ifcMethod.getModifiers())) { if (result == null) { result = new ArrayList<>(); } result.add(ifcMethod); } } } return result; } /** * Determine whether the given method is an "equals" method. * @see java.lang.Object#equals(Object) */ public static boolean isEqualsMethod(@Nullable Method method) { if (method == null || !method.getName().equals("equals")) { return false; } Class[] paramTypes = method.getParameterTypes(); return (paramTypes.length == 1 && paramTypes[0] == Object.class); } /** * Determine whether the given method is a "hashCode" method. * @see java.lang.Object#hashCode() */ public static boolean isHashCodeMethod(@Nullable Method method) { return (method != null && method.getName().equals("hashCode") && method.getParameterCount() == 0); } /** * Determine whether the given method is a "toString" method. * @see java.lang.Object#toString() */ public static boolean isToStringMethod(@Nullable Method method) { return (method != null && method.getName().equals("toString") && method.getParameterCount() == 0); } /** * Determine whether the given method is originally declared by {@link java.lang.Object}. */ public static boolean isObjectMethod(@Nullable Method method) { return (method != null && (method.getDeclaringClass() == Object.class || isEqualsMethod(method) || isHashCodeMethod(method) || isToStringMethod(method))); } /** * Determine whether the given method is a CGLIB 'renamed' method, * following the pattern "CGLIB$methodName$0". * @param renamedMethod the method to check */ public static boolean isCglibRenamedMethod(Method renamedMethod) { String name = renamedMethod.getName(); if (name.startsWith(CGLIB_RENAMED_METHOD_PREFIX)) { int i = name.length() - 1; while (i >= 0 && Character.isDigit(name.charAt(i))) { i--; } return (i > CGLIB_RENAMED_METHOD_PREFIX.length() && (i < name.length() - 1) && name.charAt(i) == '$'); } return false; } /** * Make the given method accessible, explicitly setting it accessible if * necessary. The {@code setAccessible(true)} method is only called * when actually necessary, to avoid unnecessary conflicts with a JVM * SecurityManager (if active). * @param method the method to make accessible * @see java.lang.reflect.Method#setAccessible */ @SuppressWarnings("deprecation") // on JDK 9 public static void makeAccessible(Method method) { if ((!Modifier.isPublic(method.getModifiers()) || !Modifier.isPublic(method.getDeclaringClass().getModifiers())) && !method.isAccessible()) { method.setAccessible(true); } } // Field handling /** * Attempt to find a {@link Field field} on the supplied {@link Class} with the * supplied {@code name}. Searches all superclasses up to {@link Object}. * @param clazz the class to introspect * @param name the name of the field * @return the corresponding Field object, or {@code null} if not found */ @Nullable public static Field findField(Class clazz, String name) { return findField(clazz, name, null); } /** * Attempt to find a {@link Field field} on the supplied {@link Class} with the * supplied {@code name} and/or {@link Class type}. Searches all superclasses * up to {@link Object}. * @param clazz the class to introspect * @param name the name of the field (may be {@code null} if type is specified) * @param type the type of the field (may be {@code null} if name is specified) * @return the corresponding Field object, or {@code null} if not found */ @Nullable public static Field findField(Class clazz, @Nullable String name, @Nullable Class type) { Assert.notNull(clazz, "Class must not be null"); Assert.isTrue(name != null || type != null, "Either name or type of the field must be specified"); Class searchType = clazz; while (Object.class != searchType && searchType != null) { Field[] fields = getDeclaredFields(searchType); for (Field field : fields) { if ((name == null || name.equals(field.getName())) && (type == null || type.equals(field.getType()))) { return field; } } searchType = searchType.getSuperclass(); } return null; } /** * Set the field represented by the supplied {@linkplain Field field object} on * the specified {@linkplain Object target object} to the specified {@code value}. *

In accordance with {@link Field#set(Object, Object)} semantics, the new value * is automatically unwrapped if the underlying field has a primitive type. *

This method does not support setting {@code static final} fields. *

Thrown exceptions are handled via a call to {@link #handleReflectionException(Exception)}. * @param field the field to set * @param target the target object on which to set the field * @param value the value to set (may be {@code null}) */ public static void setField(Field field, @Nullable Object target, @Nullable Object value) { try { field.set(target, value); } catch (IllegalAccessException ex) { handleReflectionException(ex); } } /** * Get the field represented by the supplied {@link Field field object} on the * specified {@link Object target object}. In accordance with {@link Field#get(Object)} * semantics, the returned value is automatically wrapped if the underlying field * has a primitive type. *

Thrown exceptions are handled via a call to {@link #handleReflectionException(Exception)}. * @param field the field to get * @param target the target object from which to get the field * @return the field's current value */ @Nullable public static Object getField(Field field, @Nullable Object target) { try { return field.get(target); } catch (IllegalAccessException ex) { handleReflectionException(ex); } throw new IllegalStateException("Should never get here"); } /** * Invoke the given callback on all locally declared fields in the given class. * @param clazz the target class to analyze * @param fc the callback to invoke for each field * @throws IllegalStateException if introspection fails * @since 4.2 * @see #doWithFields */ public static void doWithLocalFields(Class clazz, FieldCallback fc) { for (Field field : getDeclaredFields(clazz)) { try { fc.doWith(field); } catch (IllegalAccessException ex) { throw new IllegalStateException("Not allowed to access field '" + field.getName() + "': " + ex); } } } /** * Invoke the given callback on all fields in the target class, going up the * class hierarchy to get all declared fields. * @param clazz the target class to analyze * @param fc the callback to invoke for each field * @throws IllegalStateException if introspection fails */ public static void doWithFields(Class clazz, FieldCallback fc) { doWithFields(clazz, fc, null); } /** * Invoke the given callback on all fields in the target class, going up the * class hierarchy to get all declared fields. * @param clazz the target class to analyze * @param fc the callback to invoke for each field * @param ff the filter that determines the fields to apply the callback to * @throws IllegalStateException if introspection fails */ public static void doWithFields(Class clazz, FieldCallback fc, @Nullable FieldFilter ff) { // Keep backing up the inheritance hierarchy. Class targetClass = clazz; do { Field[] fields = getDeclaredFields(targetClass); for (Field field : fields) { if (ff != null && !ff.matches(field)) { continue; } try { fc.doWith(field); } catch (IllegalAccessException ex) { throw new IllegalStateException("Not allowed to access field '" + field.getName() + "': " + ex); } } targetClass = targetClass.getSuperclass(); } while (targetClass != null && targetClass != Object.class); } /** * This variant retrieves {@link Class#getDeclaredFields()} from a local cache * in order to avoid the JVM's SecurityManager check and defensive array copying. * @param clazz the class to introspect * @return the cached array of fields * @throws IllegalStateException if introspection fails * @see Class#getDeclaredFields() */ private static Field[] getDeclaredFields(Class clazz) { Assert.notNull(clazz, "Class must not be null"); Field[] result = declaredFieldsCache.get(clazz); if (result == null) { try { result = clazz.getDeclaredFields(); declaredFieldsCache.put(clazz, (result.length == 0 ? EMPTY_FIELD_ARRAY : result)); } catch (Throwable ex) { throw new IllegalStateException("Failed to introspect Class [" + clazz.getName() + "] from ClassLoader [" + clazz.getClassLoader() + "]", ex); } } return result; } /** * Given the source object and the destination, which must be the same class * or a subclass, copy all fields, including inherited fields. Designed to * work on objects with public no-arg constructors. * @throws IllegalStateException if introspection fails */ public static void shallowCopyFieldState(final Object src, final Object dest) { Assert.notNull(src, "Source for field copy cannot be null"); Assert.notNull(dest, "Destination for field copy cannot be null"); if (!src.getClass().isAssignableFrom(dest.getClass())) { throw new IllegalArgumentException("Destination class [" + dest.getClass().getName() + "] must be same or subclass as source class [" + src.getClass().getName() + "]"); } doWithFields(src.getClass(), field -> { makeAccessible(field); Object srcValue = field.get(src); field.set(dest, srcValue); }, COPYABLE_FIELDS); } /** * Determine whether the given field is a "public static final" constant. * @param field the field to check */ public static boolean isPublicStaticFinal(Field field) { int modifiers = field.getModifiers(); return (Modifier.isPublic(modifiers) && Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)); } /** * Make the given field accessible, explicitly setting it accessible if * necessary. The {@code setAccessible(true)} method is only called * when actually necessary, to avoid unnecessary conflicts with a JVM * SecurityManager (if active). * @param field the field to make accessible * @see java.lang.reflect.Field#setAccessible */ @SuppressWarnings("deprecation") // on JDK 9 public static void makeAccessible(Field field) { if ((!Modifier.isPublic(field.getModifiers()) || !Modifier.isPublic(field.getDeclaringClass().getModifiers()) || Modifier.isFinal(field.getModifiers())) && !field.isAccessible()) { field.setAccessible(true); } } // Cache handling /** * Clear the internal method/field cache. * @since 4.2.4 */ public static void clearCache() { declaredMethodsCache.clear(); declaredFieldsCache.clear(); } /** * Action to take on each method. */ @FunctionalInterface public interface MethodCallback { /** * Perform an operation using the given method. * @param method the method to operate on */ void doWith(Method method) throws IllegalArgumentException, IllegalAccessException; } /** * Callback optionally used to filter methods to be operated on by a method callback. */ @FunctionalInterface public interface MethodFilter { /** * Determine whether the given method matches. * @param method the method to check */ boolean matches(Method method); } /** * Callback interface invoked on each field in the hierarchy. */ @FunctionalInterface public interface FieldCallback { /** * Perform an operation using the given field. * @param field the field to operate on */ void doWith(Field field) throws IllegalArgumentException, IllegalAccessException; } /** * Callback optionally used to filter fields to be operated on by a field callback. */ @FunctionalInterface public interface FieldFilter { /** * Determine whether the given field matches. * @param field the field to check */ boolean matches(Field field); } }





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