spring-batch ListItemReader 源码
spring-batch ListItemReader 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/support/ListItemReader.java
/*
* Copyright 2006-2021 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.support;
import java.util.LinkedList;
import java.util.List;
import org.springframework.aop.support.AopUtils;
import org.springframework.batch.item.ItemReader;
import org.springframework.lang.Nullable;
/**
* An {@link ItemReader} that pulls data from a list. Useful for testing.
*
* @author Dave Syer
* @author jojoldu
*
*/
public class ListItemReader<T> implements ItemReader<T> {
private List<T> list;
public ListItemReader(List<T> list) {
// If it is a proxy we assume it knows how to deal with its own state.
// (It's probably transaction aware.)
if (AopUtils.isAopProxy(list)) {
this.list = list;
}
else {
this.list = new LinkedList<>(list);
}
}
@Nullable
@Override
public T read() {
if (!list.isEmpty()) {
return list.remove(0);
}
return null;
}
}
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