org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor Maven / Gradle / Ivy
/*
* 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 org.springframework.beans.BeansException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.GenericBeanDefinition;
import org.springframework.boot.context.properties.ConfigurationPropertiesBean.BindMethod;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.core.Ordered;
import org.springframework.core.PriorityOrdered;
import org.springframework.core.env.PropertySources;
import org.springframework.util.Assert;
/**
* {@link BeanPostProcessor} to bind {@link PropertySources} to beans annotated with
* {@link ConfigurationProperties @ConfigurationProperties}.
*
* @author Dave Syer
* @author Phillip Webb
* @author Christian Dupuis
* @author Stephane Nicoll
* @author Madhura Bhave
* @since 1.0.0
*/
public class ConfigurationPropertiesBindingPostProcessor
implements BeanPostProcessor, PriorityOrdered, ApplicationContextAware, InitializingBean {
/**
* The bean name that this post-processor is registered with.
*/
public static final String BEAN_NAME = ConfigurationPropertiesBindingPostProcessor.class.getName();
private ApplicationContext applicationContext;
private BeanDefinitionRegistry registry;
private ConfigurationPropertiesBinder binder;
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.applicationContext = applicationContext;
}
@Override
public void afterPropertiesSet() throws Exception {
// We can't use constructor injection of the application context because
// it causes eager factory bean initialization
this.registry = (BeanDefinitionRegistry) this.applicationContext.getAutowireCapableBeanFactory();
this.binder = ConfigurationPropertiesBinder.get(this.applicationContext);
}
@Override
public int getOrder() {
return Ordered.HIGHEST_PRECEDENCE + 1;
}
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
bind(ConfigurationPropertiesBean.get(this.applicationContext, bean, beanName));
return bean;
}
private void bind(ConfigurationPropertiesBean bean) {
if (bean == null || hasBoundValueObject(bean.getName())) {
return;
}
Assert.state(bean.getBindMethod() == BindMethod.JAVA_BEAN, "Cannot bind @ConfigurationProperties for bean '"
+ bean.getName() + "'. Ensure that @ConstructorBinding has not been applied to regular bean");
try {
this.binder.bind(bean);
}
catch (Exception ex) {
throw new ConfigurationPropertiesBindException(bean, ex);
}
}
private boolean hasBoundValueObject(String beanName) {
return this.registry.containsBeanDefinition(beanName) && this.registry
.getBeanDefinition(beanName) instanceof ConfigurationPropertiesValueObjectBeanDefinition;
}
/**
* Register a {@link ConfigurationPropertiesBindingPostProcessor} bean if one is not
* already registered.
* @param registry the bean definition registry
* @since 2.2.0
*/
public static void register(BeanDefinitionRegistry registry) {
Assert.notNull(registry, "Registry must not be null");
if (!registry.containsBeanDefinition(BEAN_NAME)) {
GenericBeanDefinition definition = new GenericBeanDefinition();
definition.setBeanClass(ConfigurationPropertiesBindingPostProcessor.class);
definition.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
registry.registerBeanDefinition(BEAN_NAME, definition);
}
ConfigurationPropertiesBinder.register(registry);
}
}