spring-batch SpringValidator 源码
spring-batch SpringValidator 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/validator/SpringValidator.java
/*
* Copyright 2006-2007 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.batch.item.validator;
import java.util.Collection;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;
import org.springframework.validation.BeanPropertyBindingResult;
import org.springframework.validation.BindException;
import org.springframework.validation.Errors;
/**
* Adapts the {@link org.springframework.validation.Validator} interface to
* {@link org.springframework.batch.item.validator.Validator}.
*
* @author Tomas Slanina
* @author Robert Kasanicky
*/
public class SpringValidator<T> implements Validator<T>, InitializingBean {
private org.springframework.validation.Validator validator;
/**
* @see Validator#validate(Object)
*/
@Override
public void validate(T item) throws ValidationException {
if (!validator.supports(item.getClass())) {
throw new ValidationException("Validation failed for " + item + ": " + item.getClass().getName()
+ " class is not supported by validator.");
}
BeanPropertyBindingResult errors = new BeanPropertyBindingResult(item, "item");
validator.validate(item, errors);
if (errors.hasErrors()) {
throw new ValidationException("Validation failed for " + item + ": " + errorsToString(errors),
new BindException(errors));
}
}
/**
* @return string of field errors followed by global errors.
*/
private String errorsToString(Errors errors) {
StringBuilder builder = new StringBuilder();
appendCollection(errors.getFieldErrors(), builder);
appendCollection(errors.getGlobalErrors(), builder);
return builder.toString();
}
/**
* Append the string representation of elements of the collection (separated by new
* lines) to the given StringBuilder.
*/
private void appendCollection(Collection<?> collection, StringBuilder builder) {
for (Object value : collection) {
builder.append("\n");
builder.append(value.toString());
}
}
public void setValidator(org.springframework.validation.Validator validator) {
this.validator = validator;
}
@Override
public void afterPropertiesSet() throws Exception {
Assert.notNull(validator, "validator must be set");
}
}
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