spring ImportAwareAotBeanPostProcessor 源码
spring ImportAwareAotBeanPostProcessor 代码
文件路径：/spring-context/src/main/java/org/springframework/context/annotation/ImportAwareAotBeanPostProcessor.java
/*
* 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.context.annotation;
import java.io.IOException;
import java.util.Map;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.core.Ordered;
import org.springframework.core.PriorityOrdered;
import org.springframework.core.type.classreading.CachingMetadataReaderFactory;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.lang.Nullable;
import org.springframework.util.ClassUtils;
/**
* A {@link BeanPostProcessor} that honours {@link ImportAware} callback using
* a mapping computed at build time.
*
* @author Stephane Nicoll
* @since 6.0
*/
public final class ImportAwareAotBeanPostProcessor implements BeanPostProcessor, PriorityOrdered {
private final MetadataReaderFactory metadataReaderFactory;
private final Map<String, String> importsMapping;
public ImportAwareAotBeanPostProcessor(Map<String, String> importsMapping) {
this.metadataReaderFactory = new CachingMetadataReaderFactory();
this.importsMapping = Map.copyOf(importsMapping);
}
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName) {
if (bean instanceof ImportAware) {
setAnnotationMetadata((ImportAware) bean);
}
return bean;
}
@Override
public int getOrder() {
return Ordered.LOWEST_PRECEDENCE; // match priority of original post processor
}
private void setAnnotationMetadata(ImportAware instance) {
String importingClass = getImportingClassFor(instance);
if (importingClass == null) {
return; // import aware configuration class not imported
}
try {
MetadataReader metadataReader = this.metadataReaderFactory.getMetadataReader(importingClass);
instance.setImportMetadata(metadataReader.getAnnotationMetadata());
}
catch (IOException ex) {
throw new IllegalStateException(String.format("Failed to read metadata for '%s'", importingClass), ex);
}
}
@Nullable
private String getImportingClassFor(ImportAware instance) {
String target = ClassUtils.getUserClass(instance).getName();
return this.importsMapping.get(target);
}
}
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