org.springframework.boot.context.properties.ConversionServiceDeducer Maven / Gradle / Ivy
/*
* Copyright 2012-2019 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.BeanFactory;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.annotation.BeanFactoryAnnotationUtils;
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;
/**
* 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;
}
ConversionService getConversionService() {
try {
return this.applicationContext.getBean(ConfigurableApplicationContext.CONVERSION_SERVICE_BEAN_NAME,
ConversionService.class);
}
catch (NoSuchBeanDefinitionException ex) {
return new Factory(this.applicationContext.getAutowireCapableBeanFactory()).create();
}
}
private static class Factory {
@SuppressWarnings("rawtypes")
private final List converters;
private final List genericConverters;
Factory(BeanFactory beanFactory) {
this.converters = beans(beanFactory, Converter.class, ConfigurationPropertiesBinding.VALUE);
this.genericConverters = beans(beanFactory, GenericConverter.class, ConfigurationPropertiesBinding.VALUE);
}
private List beans(BeanFactory beanFactory, Class type, String qualifier) {
if (beanFactory instanceof ListableBeanFactory) {
return beans(type, qualifier, (ListableBeanFactory) beanFactory);
}
return Collections.emptyList();
}
private List beans(Class type, String qualifier, ListableBeanFactory beanFactory) {
return new ArrayList<>(
BeanFactoryAnnotationUtils.qualifiedBeansOfType(beanFactory, type, qualifier).values());
}
ConversionService create() {
if (this.converters.isEmpty() && this.genericConverters.isEmpty()) {
return ApplicationConversionService.getSharedInstance();
}
ApplicationConversionService conversionService = new ApplicationConversionService();
for (Converter converter : this.converters) {
conversionService.addConverter(converter);
}
for (GenericConverter genericConverter : this.genericConverters) {
conversionService.addConverter(genericConverter);
}
return conversionService;
}
}
}