spring ConfigurationPropertiesScanRegistrar 源码
springboot ConfigurationPropertiesScanRegistrar 代码
文件路径:/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/ConfigurationPropertiesScanRegistrar.java
/*
* Copyright 2012-2020 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.context.properties;
import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.Set;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.boot.context.TypeExcludeFilter;
import org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.annotation.MergedAnnotations;
import org.springframework.core.annotation.MergedAnnotations.SearchStrategy;
import org.springframework.core.env.Environment;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.core.type.filter.AnnotationTypeFilter;
import org.springframework.stereotype.Component;
import org.springframework.util.ClassUtils;
import org.springframework.util.StringUtils;
/**
* {@link ImportBeanDefinitionRegistrar} for registering
* {@link ConfigurationProperties @ConfigurationProperties} bean definitions via scanning.
*
* @author Madhura Bhave
* @author Phillip Webb
*/
class ConfigurationPropertiesScanRegistrar implements ImportBeanDefinitionRegistrar {
private final Environment environment;
private final ResourceLoader resourceLoader;
ConfigurationPropertiesScanRegistrar(Environment environment, ResourceLoader resourceLoader) {
this.environment = environment;
this.resourceLoader = resourceLoader;
}
@Override
public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
Set<String> packagesToScan = getPackagesToScan(importingClassMetadata);
scan(registry, packagesToScan);
}
private Set<String> getPackagesToScan(AnnotationMetadata metadata) {
AnnotationAttributes attributes = AnnotationAttributes
.fromMap(metadata.getAnnotationAttributes(ConfigurationPropertiesScan.class.getName()));
String[] basePackages = attributes.getStringArray("basePackages");
Class<?>[] basePackageClasses = attributes.getClassArray("basePackageClasses");
Set<String> packagesToScan = new LinkedHashSet<>(Arrays.asList(basePackages));
for (Class<?> basePackageClass : basePackageClasses) {
packagesToScan.add(ClassUtils.getPackageName(basePackageClass));
}
if (packagesToScan.isEmpty()) {
packagesToScan.add(ClassUtils.getPackageName(metadata.getClassName()));
}
packagesToScan.removeIf((candidate) -> !StringUtils.hasText(candidate));
return packagesToScan;
}
private void scan(BeanDefinitionRegistry registry, Set<String> packages) {
ConfigurationPropertiesBeanRegistrar registrar = new ConfigurationPropertiesBeanRegistrar(registry);
ClassPathScanningCandidateComponentProvider scanner = getScanner(registry);
for (String basePackage : packages) {
for (BeanDefinition candidate : scanner.findCandidateComponents(basePackage)) {
register(registrar, candidate.getBeanClassName());
}
}
}
private ClassPathScanningCandidateComponentProvider getScanner(BeanDefinitionRegistry registry) {
ClassPathScanningCandidateComponentProvider scanner = new ClassPathScanningCandidateComponentProvider(false);
scanner.setEnvironment(this.environment);
scanner.setResourceLoader(this.resourceLoader);
scanner.addIncludeFilter(new AnnotationTypeFilter(ConfigurationProperties.class));
TypeExcludeFilter typeExcludeFilter = new TypeExcludeFilter();
typeExcludeFilter.setBeanFactory((BeanFactory) registry);
scanner.addExcludeFilter(typeExcludeFilter);
return scanner;
}
private void register(ConfigurationPropertiesBeanRegistrar registrar, String className) throws LinkageError {
try {
register(registrar, ClassUtils.forName(className, null));
}
catch (ClassNotFoundException ex) {
// Ignore
}
}
private void register(ConfigurationPropertiesBeanRegistrar registrar, Class<?> type) {
if (!isComponent(type)) {
registrar.register(type);
}
}
private boolean isComponent(Class<?> type) {
return MergedAnnotations.from(type, SearchStrategy.TYPE_HIERARCHY).isPresent(Component.class);
}
}
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