spring-batch UnopenedElementClosingEventWriter 源码
spring-batch UnopenedElementClosingEventWriter 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/xml/stax/UnopenedElementClosingEventWriter.java
/*
* Copyright 2014-2022 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.xml.stax;
import java.io.IOException;
import java.io.Writer;
import java.util.LinkedList;
import java.util.List;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLEventWriter;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.XMLEvent;
import org.springframework.util.StringUtils;
/**
* Delegating XMLEventWriter, which writes EndElement events that match a given collection
* of QNames directly to the underlying java.io.Writer instead of to the delegate
* XMLEventWriter.
*
* @author Jimmy Praet
* @since 3.0
*/
public class UnopenedElementClosingEventWriter extends AbstractEventWriterWrapper {
private LinkedList<QName> unopenedElements;
private Writer ioWriter;
public UnopenedElementClosingEventWriter(XMLEventWriter wrappedEventWriter, Writer ioWriter,
List<QName> unopenedElements) {
super(wrappedEventWriter);
this.unopenedElements = new LinkedList<>(unopenedElements);
this.ioWriter = ioWriter;
}
/*
* (non-Javadoc)
*
* @see
* org.springframework.batch.item.xml.stax.AbstractEventWriterWrapper#add(javax.xml.
* stream.events.XMLEvent)
*/
@Override
public void add(XMLEvent event) throws XMLStreamException {
if (isUnopenedElementCloseEvent(event)) {
QName element = unopenedElements.removeLast();
String nsPrefix = !StringUtils.hasText(element.getPrefix()) ? "" : element.getPrefix() + ":";
try {
super.flush();
ioWriter.write("</" + nsPrefix + element.getLocalPart() + ">");
ioWriter.flush();
}
catch (IOException ioe) {
throw new XMLStreamException("Unable to close tag: " + element, ioe);
}
}
else {
super.add(event);
}
}
private boolean isUnopenedElementCloseEvent(XMLEvent event) {
if (unopenedElements.isEmpty()) {
return false;
}
else if (!event.isEndElement()) {
return false;
}
else {
return unopenedElements.getLast().equals(event.asEndElement().getName());
}
}
}
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