spring-batch FlatFileItemWriter 源码
spring-batch FlatFileItemWriter 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/file/FlatFileItemWriter.java
/*
* Copyright 2006-2018 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.file;
import java.util.List;
import org.springframework.batch.item.file.transform.LineAggregator;
import org.springframework.batch.item.support.AbstractFileItemWriter;
import org.springframework.core.io.Resource;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
/**
* This class is an item writer that writes data to a file or stream. The writer also
* provides restart. The location of the output file is defined by a {@link Resource} and
* must represent a writable file.<br>
*
* Uses buffered writer to improve performance.<br>
*
* The implementation is <b>not</b> thread-safe.
*
* @author Waseem Malik
* @author Tomas Slanina
* @author Robert Kasanicky
* @author Dave Syer
* @author Michael Minella
* @author Mahmoud Ben Hassine
*/
public class FlatFileItemWriter<T> extends AbstractFileItemWriter<T> {
protected LineAggregator<T> lineAggregator;
public FlatFileItemWriter() {
this.setExecutionContextName(ClassUtils.getShortName(FlatFileItemWriter.class));
}
/**
* Assert that mandatory properties (lineAggregator) are set.
*
* @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
*/
@Override
public void afterPropertiesSet() throws Exception {
Assert.notNull(lineAggregator, "A LineAggregator must be provided.");
if (append) {
shouldDeleteIfExists = false;
}
}
/**
* Public setter for the {@link LineAggregator}. This will be used to translate the
* item into a line for output.
* @param lineAggregator the {@link LineAggregator} to set
*/
public void setLineAggregator(LineAggregator<T> lineAggregator) {
this.lineAggregator = lineAggregator;
}
@Override
public String doWrite(List<? extends T> items) {
StringBuilder lines = new StringBuilder();
for (T item : items) {
lines.append(this.lineAggregator.aggregate(item)).append(this.lineSeparator);
}
return lines.toString();
}
}
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