spring-batch ValidatingItemProcessor 源码
spring-batch ValidatingItemProcessor 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/validator/ValidatingItemProcessor.java
/*
* Copyright 2006-2019 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.batch.item.validator;
import org.springframework.batch.item.ItemProcessor;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* Simple implementation of {@link ItemProcessor} that validates input and returns it
* without modifications. Should the given {@link Validator} throw a
* {@link ValidationException} this processor will re-throw it to indicate the item should
* be skipped, unless {@link #setFilter(boolean)} is set to <code>true</code>, in which
* case <code>null</code> will be returned to indicate the item should be filtered.
*
* @author Robert Kasanicky
*/
public class ValidatingItemProcessor<T> implements ItemProcessor<T, T>, InitializingBean {
private Validator<? super T> validator;
private boolean filter = false;
/**
* Default constructor
*/
public ValidatingItemProcessor() {
}
/**
* Creates a ValidatingItemProcessor based on the given Validator.
* @param validator the {@link Validator} instance to be used.
*/
public ValidatingItemProcessor(Validator<? super T> validator) {
this.validator = validator;
}
/**
* Set the validator used to validate each item.
* @param validator the {@link Validator} instance to be used.
*/
public void setValidator(Validator<? super T> validator) {
this.validator = validator;
}
/**
* Should the processor filter invalid records instead of skipping them?
* @param filter if set to {@code true}, items that fail validation are filtered
* ({@code null} is returned). Otherwise, a {@link ValidationException} will be
* thrown.
*/
public void setFilter(boolean filter) {
this.filter = filter;
}
/**
* Validate the item and return it unmodified
* @return the input item
* @throws ValidationException if validation fails
*/
@Nullable
@Override
public T process(T item) throws ValidationException {
try {
validator.validate(item);
}
catch (ValidationException e) {
if (filter) {
return null; // filter the item
}
else {
throw e; // skip the item
}
}
return item;
}
@Override
public void afterPropertiesSet() throws Exception {
Assert.notNull(validator, "Validator must not be null.");
}
}
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