spring-batch ItemProcessor 源码
spring-batch ItemProcessor 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/ItemProcessor.java
/*
* Copyright 2006-2022 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;
import org.springframework.lang.NonNull;
import org.springframework.lang.Nullable;
/**
* Interface for item transformation. Given an item as input, this interface provides an
* extension point which allows for the application of business logic in an item oriented
* processing scenario. It should be noted that while it's possible to return a different
* type than the one provided, it's not strictly necessary. Furthermore, returning
* {@code null} indicates that the item should not be continued to be processed.
*
* @author Robert Kasanicky
* @author Dave Syer
* @author Mahmoud Ben Hassine
* @author Taeik Lim
* @param <I> type of input item
* @param <O> type of output item
*/
@FunctionalInterface
public interface ItemProcessor<I, O> {
/**
* Process the provided item, returning a potentially modified or new item for
* continued processing. If the returned result is {@code null}, it is assumed that
* processing of the item should not continue.
*
* A {@code null} item will never reach this method because the only possible sources
* are:
* <ul>
* <li>an {@link ItemReader} (which indicates no more items)</li>
* <li>a previous {@link ItemProcessor} in a composite processor (which indicates a
* filtered item)</li>
* </ul>
* @param item to be processed, never {@code null}.
* @return potentially modified or new item for continued processing, {@code null} if
* processing of the provided item should not continue.
* @throws Exception thrown if exception occurs during processing.
*/
@Nullable
O process(@NonNull I item) throws Exception;
}
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