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org.springframework.util.xml.XMLEventStreamWriter Maven / Gradle / Ivy
/*
* Copyright 2002-2018 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.util.xml;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLEventFactory;
import javax.xml.stream.XMLEventWriter;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.stream.events.EndElement;
import javax.xml.stream.events.Namespace;
import javax.xml.stream.events.StartElement;
/**
* Implementation of the {@link javax.xml.stream.XMLStreamWriter} interface
* that wraps an {@link XMLEventWriter}.
*
* @author Arjen Poutsma
* @since 3.0.5
* @see StaxUtils#createEventStreamWriter(javax.xml.stream.XMLEventWriter, javax.xml.stream.XMLEventFactory)
*/
class XMLEventStreamWriter implements XMLStreamWriter {
private static final String DEFAULT_ENCODING = "UTF-8";
private final XMLEventWriter eventWriter;
private final XMLEventFactory eventFactory;
private final List endElements = new ArrayList<>();
private boolean emptyElement = false;
public XMLEventStreamWriter(XMLEventWriter eventWriter, XMLEventFactory eventFactory) {
this.eventWriter = eventWriter;
this.eventFactory = eventFactory;
}
@Override
public void setNamespaceContext(NamespaceContext context) throws XMLStreamException {
this.eventWriter.setNamespaceContext(context);
}
@Override
public NamespaceContext getNamespaceContext() {
return this.eventWriter.getNamespaceContext();
}
@Override
public void setPrefix(String prefix, String uri) throws XMLStreamException {
this.eventWriter.setPrefix(prefix, uri);
}
@Override
public String getPrefix(String uri) throws XMLStreamException {
return this.eventWriter.getPrefix(uri);
}
@Override
public void setDefaultNamespace(String uri) throws XMLStreamException {
this.eventWriter.setDefaultNamespace(uri);
}
@Override
public Object getProperty(String name) throws IllegalArgumentException {
throw new IllegalArgumentException();
}
@Override
public void writeStartDocument() throws XMLStreamException {
closeEmptyElementIfNecessary();
this.eventWriter.add(this.eventFactory.createStartDocument());
}
@Override
public void writeStartDocument(String version) throws XMLStreamException {
closeEmptyElementIfNecessary();
this.eventWriter.add(this.eventFactory.createStartDocument(DEFAULT_ENCODING, version));
}
@Override
public void writeStartDocument(String encoding, String version) throws XMLStreamException {
closeEmptyElementIfNecessary();
this.eventWriter.add(this.eventFactory.createStartDocument(encoding, version));
}
@Override
public void writeStartElement(String localName) throws XMLStreamException {
closeEmptyElementIfNecessary();
doWriteStartElement(this.eventFactory.createStartElement(new QName(localName), null, null));
}
@Override
public void writeStartElement(String namespaceURI, String localName) throws XMLStreamException {
closeEmptyElementIfNecessary();
doWriteStartElement(this.eventFactory.createStartElement(new QName(namespaceURI, localName), null, null));
}
@Override
public void writeStartElement(String prefix, String localName, String namespaceURI) throws XMLStreamException {
closeEmptyElementIfNecessary();
doWriteStartElement(this.eventFactory.createStartElement(new QName(namespaceURI, localName, prefix), null, null));
}
private void doWriteStartElement(StartElement startElement) throws XMLStreamException {
this.eventWriter.add(startElement);
this.endElements.add(this.eventFactory.createEndElement(startElement.getName(), startElement.getNamespaces()));
}
@Override
public void writeEmptyElement(String localName) throws XMLStreamException {
closeEmptyElementIfNecessary();
writeStartElement(localName);
this.emptyElement = true;
}
@Override
public void writeEmptyElement(String namespaceURI, String localName) throws XMLStreamException {
closeEmptyElementIfNecessary();
writeStartElement(namespaceURI, localName);
this.emptyElement = true;
}
@Override
public void writeEmptyElement(String prefix, String localName, String namespaceURI) throws XMLStreamException {
closeEmptyElementIfNecessary();
writeStartElement(prefix, localName, namespaceURI);
this.emptyElement = true;
}
private void closeEmptyElementIfNecessary() throws XMLStreamException {
if (this.emptyElement) {
this.emptyElement = false;
writeEndElement();
}
}
@Override
public void writeEndElement() throws XMLStreamException {
closeEmptyElementIfNecessary();
int last = this.endElements.size() - 1;
EndElement lastEndElement = this.endElements.remove(last);
this.eventWriter.add(lastEndElement);
}
@Override
public void writeAttribute(String localName, String value) throws XMLStreamException {
this.eventWriter.add(this.eventFactory.createAttribute(localName, value));
}
@Override
public void writeAttribute(String namespaceURI, String localName, String value) throws XMLStreamException {
this.eventWriter.add(this.eventFactory.createAttribute(new QName(namespaceURI, localName), value));
}
@Override
public void writeAttribute(String prefix, String namespaceURI, String localName, String value)
throws XMLStreamException {
this.eventWriter.add(this.eventFactory.createAttribute(prefix, namespaceURI, localName, value));
}
@Override
public void writeNamespace(String prefix, String namespaceURI) throws XMLStreamException {
doWriteNamespace(this.eventFactory.createNamespace(prefix, namespaceURI));
}
@Override
public void writeDefaultNamespace(String namespaceURI) throws XMLStreamException {
doWriteNamespace(this.eventFactory.createNamespace(namespaceURI));
}
@SuppressWarnings("rawtypes")
private void doWriteNamespace(Namespace namespace) throws XMLStreamException {
int last = this.endElements.size() - 1;
EndElement oldEndElement = this.endElements.get(last);
Iterator oldNamespaces = oldEndElement.getNamespaces();
List newNamespaces = new ArrayList<>();
while (oldNamespaces.hasNext()) {
Namespace oldNamespace = (Namespace) oldNamespaces.next();
newNamespaces.add(oldNamespace);
}
newNamespaces.add(namespace);
EndElement newEndElement = this.eventFactory.createEndElement(oldEndElement.getName(), newNamespaces.iterator());
this.eventWriter.add(namespace);
this.endElements.set(last, newEndElement);
}
@Override
public void writeCharacters(String text) throws XMLStreamException {
closeEmptyElementIfNecessary();
this.eventWriter.add(this.eventFactory.createCharacters(text));
}
@Override
public void writeCharacters(char[] text, int start, int len) throws XMLStreamException {
closeEmptyElementIfNecessary();
this.eventWriter.add(this.eventFactory.createCharacters(new String(text, start, len)));
}
@Override
public void writeCData(String data) throws XMLStreamException {
closeEmptyElementIfNecessary();
this.eventWriter.add(this.eventFactory.createCData(data));
}
@Override
public void writeComment(String data) throws XMLStreamException {
closeEmptyElementIfNecessary();
this.eventWriter.add(this.eventFactory.createComment(data));
}
@Override
public void writeProcessingInstruction(String target) throws XMLStreamException {
closeEmptyElementIfNecessary();
this.eventWriter.add(this.eventFactory.createProcessingInstruction(target, ""));
}
@Override
public void writeProcessingInstruction(String target, String data) throws XMLStreamException {
closeEmptyElementIfNecessary();
this.eventWriter.add(this.eventFactory.createProcessingInstruction(target, data));
}
@Override
public void writeDTD(String dtd) throws XMLStreamException {
closeEmptyElementIfNecessary();
this.eventWriter.add(this.eventFactory.createDTD(dtd));
}
@Override
public void writeEntityRef(String name) throws XMLStreamException {
closeEmptyElementIfNecessary();
this.eventWriter.add(this.eventFactory.createEntityReference(name, null));
}
@Override
public void writeEndDocument() throws XMLStreamException {
closeEmptyElementIfNecessary();
this.eventWriter.add(this.eventFactory.createEndDocument());
}
@Override
public void flush() throws XMLStreamException {
this.eventWriter.flush();
}
@Override
public void close() throws XMLStreamException {
closeEmptyElementIfNecessary();
this.eventWriter.close();
}
}
