org.springframework.boot.validation.MessageInterpolatorFactory Maven / Gradle / Ivy
/*
* Copyright 2012-2017 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.validation;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
import javax.validation.MessageInterpolator;
import javax.validation.Validation;
import javax.validation.ValidationException;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.util.ClassUtils;
/**
* {@link ObjectFactory} that can be used to create a {@link MessageInterpolator}.
* Attempts to pick the most appropriate {@link MessageInterpolator} based on the
* classpath.
*
* @author Phillip Webb
*/
public class MessageInterpolatorFactory implements ObjectFactory {
private static final Set FALLBACKS;
static {
Set fallbacks = new LinkedHashSet<>();
fallbacks.add("org.hibernate.validator.messageinterpolation"
+ ".ParameterMessageInterpolator");
FALLBACKS = Collections.unmodifiableSet(fallbacks);
}
@Override
public MessageInterpolator getObject() throws BeansException {
try {
return Validation.byDefaultProvider().configure()
.getDefaultMessageInterpolator();
}
catch (ValidationException ex) {
MessageInterpolator fallback = getFallback();
if (fallback != null) {
return fallback;
}
throw ex;
}
}
private MessageInterpolator getFallback() {
for (String fallback : FALLBACKS) {
try {
return getFallback(fallback);
}
catch (Exception ex) {
// Swallow an continue
}
}
return null;
}
private MessageInterpolator getFallback(String fallback) {
Class interpolatorClass = ClassUtils.resolveClassName(fallback, null);
Object interpolator = BeanUtils.instantiateClass(interpolatorClass);
return (MessageInterpolator) interpolator;
}
}