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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;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.namespace.QName;
import javax.xml.stream.Location;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import org.apache.tuscany.sca.contribution.resolver.ModelResolver;
import org.apache.tuscany.sca.contribution.service.ContributionReadException;
import org.apache.tuscany.sca.contribution.service.ContributionResolveException;
import org.apache.tuscany.sca.contribution.service.ContributionWriteException;
import org.apache.tuscany.sca.contribution.service.UnrecognizedElementException;
/**
* Implementation of an extensible StAX artifact processor.
*
* Takes a StAXArtifactProcessorExtensionPoint and delegates to the proper
* StAXArtifactProcessor by element QName
*
* @version $Rev: 639257 $ $Date: 2008-03-20 05:12:00 -0700 (Thu, 20 Mar 2008) $
*/
public class ExtensibleStAXArtifactProcessor
implements StAXArtifactProcessor<Object> {
private static final Logger logger = Logger.getLogger(ExtensibleStAXArtifactProcessor.class.getName());
private XMLInputFactory inputFactory;
private XMLOutputFactory outputFactory;
private StAXArtifactProcessorExtensionPoint processors;
/**
* Constructs a new ExtensibleStAXArtifactProcessor.
* @param processors
* @param inputFactory
* @param outputFactory
*/
public ExtensibleStAXArtifactProcessor(StAXArtifactProcessorExtensionPoint processors, XMLInputFactory inputFactory, XMLOutputFactory outputFactory) {
super();
this.processors = processors;
this.inputFactory = inputFactory;
this.outputFactory = outputFactory;
//this.outputFactory.setProperty("javax.xml.stream.isRepairingNamespaces", Boolean.TRUE);
}
public Object read(XMLStreamReader source) throws ContributionReadException, XMLStreamException {
// Delegate to the processor associated with the element QName
QName name = source.getName();
StAXArtifactProcessor<?> processor = (StAXArtifactProcessor<?>)processors.getProcessor(name);
if (processor == null) {
if (logger.isLoggable(Level.WARNING)) {
Location location = source.getLocation();
logger.warning("Element " + name + " cannot be processed. (" + location + ")");
}
return null;
}
return processor.read(source);
}
@SuppressWarnings("unchecked")
public void write(Object model, XMLStreamWriter outputSource) throws ContributionWriteException, XMLStreamException {
// Delegate to the processor associated with the model type
if (model != null) {
StAXArtifactProcessor processor = processors.getProcessor(model.getClass());
if (processor != null) {
processor.write(model, outputSource);
} else {
if (logger.isLoggable(Level.WARNING)) {
logger.warning("No StAX processor is configured to handle " + model.getClass());
}
}
}
}
@SuppressWarnings("unchecked")
public void resolve(Object model, ModelResolver resolver) throws ContributionResolveException {
// Delegate to the processor associated with the model type
if (model != null) {
StAXArtifactProcessor processor = processors.getProcessor(model.getClass());
if (processor != null) {
processor.resolve(model, resolver);
}
}
}
/**
* Read a model from an InputStream.
* @param is The artifact InputStream
* @param type Model type
* @return The model
* @throws ContributionReadException
*/
public <M> M read(InputStream is, Class<M> type) throws ContributionReadException {
try {
XMLStreamReader reader;
try {
reader = inputFactory.createXMLStreamReader(is);
try {
reader.nextTag();
QName name = reader.getName();
Object mo = read(reader);
if (type.isInstance(mo)) {
return type.cast(mo);
} else {
UnrecognizedElementException e = new UnrecognizedElementException(name);
throw e;
}
} catch (ContributionReadException e) {
Location location = reader.getLocation();
e.setLine(location.getLineNumber());
e.setColumn(location.getColumnNumber());
throw e;
} finally {
try {
reader.close();
} catch (XMLStreamException e) {
// ignore
}
}
} finally {
try {
is.close();
} catch (IOException e) {
// ignore
}
}
} catch (XMLStreamException e) {
ContributionReadException ce = new ContributionReadException(e);
throw ce;
}
}
/**
* Write a model to an OutputStream.
* @param model
* @param os
* @throws ContributionWriteException
*/
public void write(Object model, OutputStream os) throws ContributionWriteException {
try {
XMLStreamWriter writer = outputFactory.createXMLStreamWriter(os);
write(model, writer);
writer.flush();
writer.close();
} catch (XMLStreamException e) {
throw new ContributionWriteException(e);
}
}
public QName getArtifactType() {
return null;
}
public Class<Object> getModelType() {
return null;
}
}
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