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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* http://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.apache.tuscany.sca.contribution.processor.xml;
import static javax.xml.stream.XMLStreamConstants.CDATA;
import static javax.xml.stream.XMLStreamConstants.CHARACTERS;
import static javax.xml.stream.XMLStreamConstants.END_ELEMENT;
import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.stream.events.XMLEvent;
import org.apache.tuscany.sca.contribution.Constants;
import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
import org.apache.tuscany.sca.contribution.processor.ContributionResolveException;
import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
import org.apache.tuscany.sca.core.FactoryExtensionPoint;
import org.apache.tuscany.sca.monitor.Monitor;
public class AnyElementProcessor implements StAXArtifactProcessor<Object> {
private static final QName ANY_ELEMENT = new QName(Constants.XMLSCHEMA_NS, "anyElement");
private XMLInputFactory xmlInputFactory;
@SuppressWarnings("unused")
private Monitor monitor;
public AnyElementProcessor(FactoryExtensionPoint modelFactories, Monitor monitor) {
xmlInputFactory = modelFactories.getFactory(XMLInputFactory.class);
this.monitor = monitor;
}
public QName getArtifactType() {
return ANY_ELEMENT;
}
public Class<Object> getModelType() {
return Object.class;
}
/**
* Reads the contetns of the unknown elements and generates a custom
* implementation of XMLStreamReader i.e. XMLEventsStreamReader
*
* @param reader
* @return
* @throws XMLStreamException
*/
@SuppressWarnings("unchecked")
public Object read(XMLStreamReader reader) throws ContributionReadException, XMLStreamException {
// Custom variables
String currentElement = null;
List eventsList = new ArrayList();
Map<String, NamespaceContext> eventContext = new HashMap<String, NamespaceContext>();
try {
// Cast the block of unknown elements into document
XMLDocumentStreamReader docReader = new XMLDocumentStreamReader(reader);
XMLEventReader xmlEventReader = xmlInputFactory.createXMLEventReader(docReader);
while (xmlEventReader.hasNext()) {
XMLEvent event = xmlEventReader.nextEvent();
// Populate the eventContext map with the current element's name
// and corresponding NamesapceContext
if (currentElement != null && !(eventContext.containsKey(currentElement))) {
eventContext.put(currentElement, reader.getNamespaceContext());
}
// Populate the list with the XMLEvents
eventsList.add(event);
if (event.isStartElement()) {
currentElement = reader.getName().getLocalPart();
}
if (event.isEndDocument()) {
return new XMLEventsStreamReader(eventsList, eventContext);
}
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* Writes unknown portions back to the writer
*
* @param model
* @param writer
*/
public void write(Object model, XMLStreamWriter writer) throws XMLStreamException {
if (!(model instanceof XMLStreamReader)) {
return;
}
XMLStreamReader reader = (XMLStreamReader)model;
int event = reader.getEventType();
while (reader.hasNext()) {
switch (event) {
case START_ELEMENT:
writer.writeStartElement(reader.getPrefix(), reader.getLocalName(), reader.getNamespaceURI());
for (int i = 1; i <= reader.getAttributeCount(); i++) {
writer.writeAttribute(reader.getAttributePrefix(i), reader.getAttributeNamespace(i), reader
.getAttributeLocalName(i), reader.getAttributeValue(i));
}
break;
case CHARACTERS:
writer.writeCharacters(reader.getText());
break;
case CDATA:
writer.writeCData(reader.getText());
break;
case END_ELEMENT:
writer.writeEndElement();
break;
}
if (reader.hasNext()) {
event = reader.next();
}
}
}
public void resolve(Object model, ModelResolver resolver) throws ContributionResolveException {
}
}
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