com.reger.dubbo.config.ConfigurationPropertiesBinder Maven / Gradle / Ivy
/*
* Copyright 2012-2018 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
*
* http://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 com.reger.dubbo.config;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;
import org.springframework.beans.PropertyEditorRegistry;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor;
import org.springframework.boot.context.properties.bind.BindHandler;
import org.springframework.boot.context.properties.bind.Bindable;
import org.springframework.boot.context.properties.bind.Binder;
import org.springframework.boot.context.properties.bind.PropertySourcesPlaceholdersResolver;
import org.springframework.boot.context.properties.bind.handler.IgnoreErrorsBindHandler;
import org.springframework.boot.context.properties.bind.handler.NoUnboundElementsBindHandler;
import org.springframework.boot.context.properties.bind.validation.ValidationBindHandler;
import org.springframework.boot.context.properties.source.ConfigurationPropertySource;
import org.springframework.boot.context.properties.source.ConfigurationPropertySources;
import org.springframework.boot.context.properties.source.UnboundElementsSourceFilter;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.env.PropertySources;
import org.springframework.util.Assert;
import org.springframework.validation.Validator;
import org.springframework.validation.annotation.Validated;
/**
* Internal class by the {@link ConfigurationPropertiesBindingPostProcessor} to handle the
* actual {@link ConfigurationProperties} binding.
*
* @author Stephane Nicoll
* @author Phillip Webb
*/
class ConfigurationPropertiesBinder {
private final ApplicationContext applicationContext;
private final PropertySources propertySources;
private final Validator configurationPropertiesValidator;
private final Validator jsr303Validator;
private volatile Binder binder;
ConfigurationPropertiesBinder(ApplicationContext applicationContext,
String validatorBeanName) {
this.applicationContext = applicationContext;
this.propertySources = new PropertySourcesDeducer(applicationContext)
.getPropertySources();
this.configurationPropertiesValidator = getConfigurationPropertiesValidator(
applicationContext, validatorBeanName);
this.jsr303Validator = ConfigurationPropertiesJsr303Validator
.getIfJsr303Present(applicationContext);
}
public void bind(Bindable target) {
ConfigurationProperties annotation = target
.getAnnotation(ConfigurationProperties.class);
Assert.state(annotation != null, "Missing @ConfigurationProperties on " + target);
List validators = getValidators(target);
BindHandler bindHandler = getBindHandler(annotation, validators);
getBinder().bind(annotation.prefix(), target, bindHandler);
}
private Validator getConfigurationPropertiesValidator(
ApplicationContext applicationContext, String validatorBeanName) {
if (applicationContext.containsBean(validatorBeanName)) {
return applicationContext.getBean(validatorBeanName, Validator.class);
}
return null;
}
private List getValidators(Bindable target) {
List validators = new ArrayList<>(3);
if (this.configurationPropertiesValidator != null) {
validators.add(this.configurationPropertiesValidator);
}
if (this.jsr303Validator != null
&& target.getAnnotation(Validated.class) != null) {
validators.add(this.jsr303Validator);
}
if (target.getValue() != null && target.getValue().get() instanceof Validator) {
validators.add((Validator) target.getValue().get());
}
return validators;
}
private BindHandler getBindHandler(ConfigurationProperties annotation,
List validators) {
BindHandler handler = BindHandler.DEFAULT;
if (annotation.ignoreInvalidFields()) {
handler = new IgnoreErrorsBindHandler(handler);
}
if (!annotation.ignoreUnknownFields()) {
UnboundElementsSourceFilter filter = new UnboundElementsSourceFilter();
handler = new NoUnboundElementsBindHandler(handler, filter);
}
if (!validators.isEmpty()) {
handler = new ValidationBindHandler(handler,
validators.toArray(new Validator[0]));
}
return handler;
}
private Binder getBinder() {
if (this.binder == null) {
this.binder = new Binder(getConfigurationPropertySources(),
getPropertySourcesPlaceholdersResolver(), getConversionService(),
getPropertyEditorInitializer());
}
return this.binder;
}
private Iterable getConfigurationPropertySources() {
return ConfigurationPropertySources.from(this.propertySources);
}
private PropertySourcesPlaceholdersResolver getPropertySourcesPlaceholdersResolver() {
return new PropertySourcesPlaceholdersResolver(this.propertySources);
}
private ConversionService getConversionService() {
return new ConversionServiceDeducer(this.applicationContext)
.getConversionService();
}
private Consumer getPropertyEditorInitializer() {
if (this.applicationContext instanceof ConfigurableApplicationContext) {
return ((ConfigurableApplicationContext) this.applicationContext)
.getBeanFactory()::copyRegisteredEditorsTo;
}
return null;
}
}