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/*
* 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.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Method;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;
import org.springframework.aop.support.AopUtils;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.boot.context.properties.bind.Bindable;
import org.springframework.boot.context.properties.bind.Binder;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.core.ResolvableType;
import org.springframework.core.annotation.MergedAnnotation;
import org.springframework.core.annotation.MergedAnnotations;
import org.springframework.core.annotation.MergedAnnotations.SearchStrategy;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.ReflectionUtils;
import org.springframework.validation.annotation.Validated;
/**
* Provides access to {@link ConfigurationProperties @ConfigurationProperties} bean
* details, regardless of if the annotation was used directly or on a {@link Bean @Bean}
* factory method. This class can be used to access {@link #getAll(ApplicationContext)
* all} configuration properties beans in an ApplicationContext, or
* {@link #get(ApplicationContext, Object, String) individual beans} on a case-by-case
* basis (for example, in a {@link BeanPostProcessor}).
*
* @author Phillip Webb
* @since 2.2.0
* @see #getAll(ApplicationContext)
* @see #get(ApplicationContext, Object, String)
*/
public final class ConfigurationPropertiesBean {
private final String name;
private final Object instance;
private final ConfigurationProperties annotation;
private final Bindable bindTarget;
private final BindMethod bindMethod;
private ConfigurationPropertiesBean(String name, Object instance, ConfigurationProperties annotation,
Bindable bindTarget) {
this.name = name;
this.instance = instance;
this.annotation = annotation;
this.bindTarget = bindTarget;
this.bindMethod = BindMethod.forType(bindTarget.getType().resolve());
}
/**
* Return the name of the Spring bean.
* @return the bean name
*/
public String getName() {
return this.name;
}
/**
* Return the actual Spring bean instance.
* @return the bean instance
*/
public Object getInstance() {
return this.instance;
}
/**
* Return the bean type.
* @return the bean type
*/
Class getType() {
return this.bindTarget.getType().resolve();
}
/**
* Return the property binding method that was used for the bean.
* @return the bind type
*/
public BindMethod getBindMethod() {
return this.bindMethod;
}
/**
* Return the {@link ConfigurationProperties} annotation for the bean. The annotation
* may be defined on the bean itself or from the factory method that create the bean
* (usually a {@link Bean @Bean} method).
* @return the configuration properties annotation
*/
public ConfigurationProperties getAnnotation() {
return this.annotation;
}
/**
* Return a {@link Bindable} instance suitable that can be used as a target for the
* {@link Binder}.
* @return a bind target for use with the {@link Binder}
*/
public Bindable asBindTarget() {
return this.bindTarget;
}
/**
* Return all {@link ConfigurationProperties @ConfigurationProperties} beans contained
* in the given application context. Both directly annotated beans, as well as beans
* that have {@link ConfigurationProperties @ConfigurationProperties} annotated
* factory methods are included.
* @param applicationContext the source application context
* @return a map of all configuration properties beans keyed by the bean name
*/
public static Map getAll(ApplicationContext applicationContext) {
Assert.notNull(applicationContext, "ApplicationContext must not be null");
if (applicationContext instanceof ConfigurableApplicationContext) {
return getAll((ConfigurableApplicationContext) applicationContext);
}
Map propertiesBeans = new LinkedHashMap<>();
applicationContext.getBeansWithAnnotation(ConfigurationProperties.class)
.forEach((beanName, bean) -> propertiesBeans.put(beanName, get(applicationContext, bean, beanName)));
return propertiesBeans;
}
private static Map getAll(ConfigurableApplicationContext applicationContext) {
Map propertiesBeans = new LinkedHashMap<>();
ConfigurableListableBeanFactory beanFactory = applicationContext.getBeanFactory();
Iterator beanNames = beanFactory.getBeanNamesIterator();
while (beanNames.hasNext()) {
String beanName = beanNames.next();
if (isConfigurationPropertiesBean(beanFactory, beanName)) {
try {
Object bean = beanFactory.getBean(beanName);
ConfigurationPropertiesBean propertiesBean = get(applicationContext, bean, beanName);
propertiesBeans.put(beanName, propertiesBean);
}
catch (Exception ex) {
}
}
}
return propertiesBeans;
}
private static boolean isConfigurationPropertiesBean(ConfigurableListableBeanFactory beanFactory, String beanName) {
try {
if (beanFactory.getBeanDefinition(beanName).isAbstract()) {
return false;
}
if (beanFactory.findAnnotationOnBean(beanName, ConfigurationProperties.class) != null) {
return true;
}
Method factoryMethod = findFactoryMethod(beanFactory, beanName);
return findMergedAnnotation(factoryMethod, ConfigurationProperties.class).isPresent();
}
catch (NoSuchBeanDefinitionException ex) {
return false;
}
}
/**
* Return a {@link ConfigurationPropertiesBean @ConfigurationPropertiesBean} instance
* for the given bean details or {@code null} if the bean is not a
* {@link ConfigurationProperties @ConfigurationProperties} object. Annotations are
* considered both on the bean itself, as well as any factory method (for example a
* {@link Bean @Bean} method).
* @param applicationContext the source application context
* @param bean the bean to consider
* @param beanName the bean name
* @return a configuration properties bean or {@code null} if the neither the bean or
* factory method are annotated with
* {@link ConfigurationProperties @ConfigurationProperties}
*/
public static ConfigurationPropertiesBean get(ApplicationContext applicationContext, Object bean, String beanName) {
Method factoryMethod = findFactoryMethod(applicationContext, beanName);
return create(beanName, bean, bean.getClass(), factoryMethod);
}
private static Method findFactoryMethod(ApplicationContext applicationContext, String beanName) {
if (applicationContext instanceof ConfigurableApplicationContext) {
return findFactoryMethod((ConfigurableApplicationContext) applicationContext, beanName);
}
return null;
}
private static Method findFactoryMethod(ConfigurableApplicationContext applicationContext, String beanName) {
return findFactoryMethod(applicationContext.getBeanFactory(), beanName);
}
private static Method findFactoryMethod(ConfigurableListableBeanFactory beanFactory, String beanName) {
if (beanFactory.containsBeanDefinition(beanName)) {
BeanDefinition beanDefinition = beanFactory.getMergedBeanDefinition(beanName);
if (beanDefinition instanceof RootBeanDefinition) {
Method resolvedFactoryMethod = ((RootBeanDefinition) beanDefinition).getResolvedFactoryMethod();
if (resolvedFactoryMethod != null) {
return resolvedFactoryMethod;
}
}
return findFactoryMethodUsingReflection(beanFactory, beanDefinition);
}
return null;
}
private static Method findFactoryMethodUsingReflection(ConfigurableListableBeanFactory beanFactory,
BeanDefinition beanDefinition) {
String factoryMethodName = beanDefinition.getFactoryMethodName();
String factoryBeanName = beanDefinition.getFactoryBeanName();
if (factoryMethodName == null || factoryBeanName == null) {
return null;
}
Class factoryType = beanFactory.getType(factoryBeanName);
if (factoryType.getName().contains(ClassUtils.CGLIB_CLASS_SEPARATOR)) {
factoryType = factoryType.getSuperclass();
}
AtomicReference factoryMethod = new AtomicReference<>();
ReflectionUtils.doWithMethods(factoryType, (method) -> {
if (method.getName().equals(factoryMethodName)) {
factoryMethod.set(method);
}
});
return factoryMethod.get();
}
static ConfigurationPropertiesBean forValueObject(Class beanClass, String beanName) {
ConfigurationPropertiesBean propertiesBean = create(beanName, null, beanClass, null);
Assert.state(propertiesBean != null && propertiesBean.getBindMethod() == BindMethod.VALUE_OBJECT,
"Bean '" + beanName + "' is not a @ConfigurationProperties value object");
return propertiesBean;
}
private static ConfigurationPropertiesBean create(String name, Object instance, Class type, Method factory) {
ConfigurationProperties annotation = findAnnotation(instance, type, factory, ConfigurationProperties.class);
if (annotation == null) {
return null;
}
Validated validated = findAnnotation(instance, type, factory, Validated.class);
Annotation[] annotations = (validated != null) ? new Annotation[] { annotation, validated }
: new Annotation[] { annotation };
ResolvableType bindType = (factory != null) ? ResolvableType.forMethodReturnType(factory)
: ResolvableType.forClass(type);
Bindable
