spring ConversionServiceDeducer 源码
springboot ConversionServiceDeducer 代码
文件路径:/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/ConversionServiceDeducer.java
/*
* Copyright 2012-2022 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.boot.context.properties;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.beans.factory.annotation.BeanFactoryAnnotationUtils;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.boot.convert.ApplicationConversionService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.converter.Converter;
import org.springframework.core.convert.converter.GenericConverter;
import org.springframework.format.Formatter;
import org.springframework.format.FormatterRegistry;
/**
* Utility to deduce the {@link ConversionService} to use for configuration properties
* binding.
*
* @author Phillip Webb
*/
class ConversionServiceDeducer {
private final ApplicationContext applicationContext;
ConversionServiceDeducer(ApplicationContext applicationContext) {
this.applicationContext = applicationContext;
}
List<ConversionService> getConversionServices() {
if (hasUserDefinedConfigurationServiceBean()) {
return Collections.singletonList(this.applicationContext
.getBean(ConfigurableApplicationContext.CONVERSION_SERVICE_BEAN_NAME, ConversionService.class));
}
if (this.applicationContext instanceof ConfigurableApplicationContext configurableContext) {
return getConversionServices(configurableContext);
}
return null;
}
private List<ConversionService> getConversionServices(ConfigurableApplicationContext applicationContext) {
List<ConversionService> conversionServices = new ArrayList<>();
if (applicationContext.getBeanFactory().getConversionService() != null) {
conversionServices.add(applicationContext.getBeanFactory().getConversionService());
}
ConverterBeans converterBeans = new ConverterBeans(applicationContext);
if (!converterBeans.isEmpty()) {
ApplicationConversionService beansConverterService = new ApplicationConversionService();
converterBeans.addTo(beansConverterService);
conversionServices.add(beansConverterService);
}
return conversionServices;
}
private boolean hasUserDefinedConfigurationServiceBean() {
String beanName = ConfigurableApplicationContext.CONVERSION_SERVICE_BEAN_NAME;
return this.applicationContext.containsBean(beanName) && this.applicationContext.getAutowireCapableBeanFactory()
.isTypeMatch(beanName, ConversionService.class);
}
private static class ConverterBeans {
@SuppressWarnings("rawtypes")
private final List<Converter> converters;
private final List<GenericConverter> genericConverters;
@SuppressWarnings("rawtypes")
private final List<Formatter> formatters;
ConverterBeans(ConfigurableApplicationContext applicationContext) {
ConfigurableListableBeanFactory beanFactory = applicationContext.getBeanFactory();
this.converters = beans(Converter.class, ConfigurationPropertiesBinding.VALUE, beanFactory);
this.genericConverters = beans(GenericConverter.class, ConfigurationPropertiesBinding.VALUE, beanFactory);
this.formatters = beans(Formatter.class, ConfigurationPropertiesBinding.VALUE, beanFactory);
}
private <T> List<T> beans(Class<T> type, String qualifier, ListableBeanFactory beanFactory) {
return new ArrayList<>(
BeanFactoryAnnotationUtils.qualifiedBeansOfType(beanFactory, type, qualifier).values());
}
boolean isEmpty() {
return this.converters.isEmpty() && this.genericConverters.isEmpty() && this.formatters.isEmpty();
}
void addTo(FormatterRegistry registry) {
for (Converter<?, ?> converter : this.converters) {
registry.addConverter(converter);
}
for (GenericConverter genericConverter : this.genericConverters) {
registry.addConverter(genericConverter);
}
for (Formatter<?> formatter : this.formatters) {
registry.addFormatter(formatter);
}
}
}
}
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