org.springframework.boot.web.servlet.ServletComponentScanRegistrar Maven / Gradle / Ivy
/*
* Copyright 2012-2023 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.boot.web.servlet;
import java.util.Arrays;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.function.Supplier;
import org.springframework.beans.factory.aot.BeanRegistrationExcludeFilter;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.GenericBeanDefinition;
import org.springframework.beans.factory.support.RegisteredBean;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.util.ClassUtils;
/**
* {@link ImportBeanDefinitionRegistrar} used by
* {@link ServletComponentScan @ServletComponentScan}.
*
* @author Andy Wilkinson
* @author Stephane Nicoll
*/
class ServletComponentScanRegistrar implements ImportBeanDefinitionRegistrar {
private static final String BEAN_NAME = "servletComponentRegisteringPostProcessor";
@Override
public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
Set packagesToScan = getPackagesToScan(importingClassMetadata);
if (registry.containsBeanDefinition(BEAN_NAME)) {
updatePostProcessor(registry, packagesToScan);
}
else {
addPostProcessor(registry, packagesToScan);
}
}
private void updatePostProcessor(BeanDefinitionRegistry registry, Set packagesToScan) {
ServletComponentRegisteringPostProcessorBeanDefinition definition = (ServletComponentRegisteringPostProcessorBeanDefinition) registry
.getBeanDefinition(BEAN_NAME);
definition.addPackageNames(packagesToScan);
}
private void addPostProcessor(BeanDefinitionRegistry registry, Set packagesToScan) {
ServletComponentRegisteringPostProcessorBeanDefinition definition = new ServletComponentRegisteringPostProcessorBeanDefinition(
packagesToScan);
registry.registerBeanDefinition(BEAN_NAME, definition);
}
private Set getPackagesToScan(AnnotationMetadata metadata) {
AnnotationAttributes attributes = AnnotationAttributes
.fromMap(metadata.getAnnotationAttributes(ServletComponentScan.class.getName()));
String[] basePackages = attributes.getStringArray("basePackages");
Class[] basePackageClasses = attributes.getClassArray("basePackageClasses");
Set packagesToScan = new LinkedHashSet<>(Arrays.asList(basePackages));
for (Class basePackageClass : basePackageClasses) {
packagesToScan.add(ClassUtils.getPackageName(basePackageClass));
}
if (packagesToScan.isEmpty()) {
packagesToScan.add(ClassUtils.getPackageName(metadata.getClassName()));
}
return packagesToScan;
}
static final class ServletComponentRegisteringPostProcessorBeanDefinition extends GenericBeanDefinition {
private final Set packageNames = new LinkedHashSet<>();
ServletComponentRegisteringPostProcessorBeanDefinition(Collection packageNames) {
setBeanClass(ServletComponentRegisteringPostProcessor.class);
setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
addPackageNames(packageNames);
}
@Override
public Supplier getInstanceSupplier() {
return () -> new ServletComponentRegisteringPostProcessor(this.packageNames);
}
private void addPackageNames(Collection additionalPackageNames) {
this.packageNames.addAll(additionalPackageNames);
}
}
static class ServletComponentScanBeanRegistrationExcludeFilter implements BeanRegistrationExcludeFilter {
@Override
public boolean isExcludedFromAotProcessing(RegisteredBean registeredBean) {
return BEAN_NAME.equals(registeredBean.getBeanName());
}
}
}