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ClassHintUtils.java
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ClassHintUtils.java
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/*
* Copyright 2002-2022 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.aot.hint.support;
import java.lang.reflect.Proxy;
import java.util.function.Consumer;
import org.springframework.aot.hint.MemberCategory;
import org.springframework.aot.hint.RuntimeHints;
import org.springframework.aot.hint.TypeHint;
import org.springframework.util.ClassUtils;
/**
* Utilities for core hint inference on Spring-managed classes,
* specifically for proxy types such as interface-based JDK proxies
* and CGLIB-generated subclasses which need proxy/reflection hints.
*
* <p>Note that this class does not take specifics of Spring AOP or
* any other framework arrangement into account. It just operates
* on the JDK and CGLIB proxy facilities and their core conventions.
*
* @author Juergen Hoeller
* @since 6.0.3
* @see org.springframework.aot.hint.ProxyHints
* @see org.springframework.aot.hint.ReflectionHints
*/
public abstract class ClassHintUtils {
private static final Consumer<TypeHint.Builder> asClassBasedProxy = hint ->
hint.withMembers(MemberCategory.INVOKE_DECLARED_CONSTRUCTORS,
MemberCategory.INVOKE_DECLARED_METHODS,
MemberCategory.DECLARED_FIELDS);
private static final Consumer<TypeHint.Builder> asProxiedUserClass = hint ->
hint.withMembers(MemberCategory.INVOKE_PUBLIC_METHODS);
/**
* Register a proxy hint for a JDK proxy or corresponding reflection hints
* for a CGLIB-generated subclass, if necessary.
* @param candidateClass the class to introspect
* @param runtimeHints the RuntimeHints instance to register the hints on
* @see Proxy#isProxyClass(Class)
* @see ClassUtils#getUserClass(Class)
*/
public static void registerProxyIfNecessary(Class<?> candidateClass, RuntimeHints runtimeHints) {
if (Proxy.isProxyClass(candidateClass)) {
// A JDK proxy class needs an explicit hint
runtimeHints.proxies().registerJdkProxy(candidateClass.getInterfaces());
}
else {
// Potentially a CGLIB-generated subclass with reflection hints
Class<?> userClass = ClassUtils.getUserClass(candidateClass);
if (userClass != candidateClass) {
runtimeHints.reflection()
.registerType(candidateClass, asClassBasedProxy)
.registerType(userClass, asProxiedUserClass);
}
}
}
}