spring SpringWebConstraintValidatorFactory 源码
spring SpringWebConstraintValidatorFactory 代码
文件路径：/spring-web/src/main/java/org/springframework/web/bind/support/SpringWebConstraintValidatorFactory.java
/*
* Copyright 2002-2015 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.web.bind.support;
import jakarta.validation.ConstraintValidator;
import jakarta.validation.ConstraintValidatorFactory;
import org.springframework.web.context.ContextLoader;
import org.springframework.web.context.WebApplicationContext;
/**
* JSR-303 {@link ConstraintValidatorFactory} implementation that delegates to
* the current Spring {@link WebApplicationContext} for creating autowired
* {@link ConstraintValidator} instances.
*
* <p>In contrast to
* {@link org.springframework.validation.beanvalidation.SpringConstraintValidatorFactory},
* this variant is meant for declarative use in a standard {@code validation.xml} file,
* e.g. in combination with JAX-RS or JAX-WS.
*
* @author Juergen Hoeller
* @since 4.2.1
* @see ContextLoader#getCurrentWebApplicationContext()
* @see org.springframework.validation.beanvalidation.SpringConstraintValidatorFactory
*/
public class SpringWebConstraintValidatorFactory implements ConstraintValidatorFactory {
@Override
public <T extends ConstraintValidator<?, ?>> T getInstance(Class<T> key) {
return getWebApplicationContext().getAutowireCapableBeanFactory().createBean(key);
}
// Bean Validation 1.1 releaseInstance method
@Override
public void releaseInstance(ConstraintValidator<?, ?> instance) {
getWebApplicationContext().getAutowireCapableBeanFactory().destroyBean(instance);
}
/**
* Retrieve the Spring {@link WebApplicationContext} to use.
* The default implementation returns the current {@link WebApplicationContext}
* as registered for the thread context class loader.
* @return the current WebApplicationContext (never {@code null})
* @see ContextLoader#getCurrentWebApplicationContext()
*/
protected WebApplicationContext getWebApplicationContext() {
WebApplicationContext wac = ContextLoader.getCurrentWebApplicationContext();
if (wac == null) {
throw new IllegalStateException("No WebApplicationContext registered for current thread - " +
"consider overriding SpringWebConstraintValidatorFactory.getWebApplicationContext()");
}
return wac;
}
}
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