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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.databinding.jaxb.axiom.ext;
import java.io.OutputStream;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.attachment.AttachmentMarshaller;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import org.apache.axiom.om.OMException;
import org.apache.axiom.om.impl.MTOMXMLStreamWriter;
import org.apache.tuscany.sca.databinding.jaxb.JAXBContextHelper;
/*
* To marshal or unmarshal a JAXB object, the JAXBContext is necessary.
* In addition, access to the MessageContext and other context objects may be necessary
* to get classloader information, store attachments etc.
*
* The JAXBDSContext bundles all of this information together.
*/
public class JAXBDSContext {
private static final Logger log = Logger.getLogger(JAXBDSContext.class.getName());
private static final boolean DEBUG_ENABLED = log.isLoggable(Level.FINER);
private JAXBContext jaxbContext = null; // JAXBContext
private JAXBContextHelper contextHelper;
/**
* "Dispatch" Constructor Use this full constructor when the JAXBContent is provided by the
* customer.
*
* @param jaxbContext
*/
public JAXBDSContext(JAXBContext jaxbContext, JAXBContextHelper contextHelper) {
this.jaxbContext = jaxbContext;
this.contextHelper = contextHelper;
}
public JAXBContext getJAXBContext() {
return jaxbContext;
}
/**
* Unmarshal the xml into a JAXB object
* @param reader
* @return
* @throws JAXBException
*/
public Object unmarshal(XMLStreamReader reader) throws JAXBException {
Unmarshaller u = contextHelper.getUnmarshaller(getJAXBContext());
Object jaxb = null;
// Unmarshal into the business object.
jaxb = unmarshalElement(u, reader); // preferred and always used for
// style=document
// Successfully unmarshalled the object
// JAXBUtils.releaseJAXBUnmarshaller(getJAXBContext(cl), u);
// Don't close the reader. The reader is owned by the caller, and it
// may contain other xml instance data (other than this JAXB object)
// reader.close();
return jaxb;
}
/**
* Marshal the jaxb object
* @param obj
* @param writer
* @param am AttachmentMarshaller, optional Attachment
*/
public void marshal(Object obj, XMLStreamWriter writer) throws JAXBException {
// Very easy, use the Context to get the Marshaller.
// Use the marshaller to write the object.
Marshaller m = contextHelper.getMarshaller(getJAXBContext());
AttachmentMarshaller am = m.getAttachmentMarshaller();
boolean xop = am != null ? am.isXOPPackage() : false;
// Marshal the object
marshalElement(obj, m, writer, !xop);
}
/**
* Preferred way to marshal objects.
*
* @param b Object that can be rendered as an element and the element name is known by the
* Marshaller
* @param m Marshaller
* @param writer XMLStreamWriter
*/
private static void marshalElement(final Object b,
final Marshaller m,
final XMLStreamWriter writer,
final boolean optimize) {
AccessController.doPrivileged(new PrivilegedAction<Object>() {
public Object run() {
// Marshalling directly to the output stream is faster than marshalling through the
// XMLStreamWriter.
// Take advantage of this optimization if there is an output stream.
try {
OutputStream os = (optimize) ? getOutputStream(writer) : null;
if (os != null) {
writer.flush();
m.marshal(b, os);
} else {
m.marshal(b, writer);
}
} catch (OMException e) {
throw e;
} catch (Throwable t) {
throw new OMException(t);
}
return null;
}
});
}
/**
* If the writer is backed by an OutputStream, then return the OutputStream
* @param writer
* @return OutputStream or null
*/
private static OutputStream getOutputStream(XMLStreamWriter writer) throws XMLStreamException {
if (writer.getClass() == MTOMXMLStreamWriter.class) {
return ((MTOMXMLStreamWriter)writer).getOutputStream();
}
if (writer.getClass() == XMLStreamWriterWithOS.class) {
return ((XMLStreamWriterWithOS)writer).getOutputStream();
}
return null;
}
/**
* Preferred way to unmarshal objects
*
* @param u Unmarshaller
* @param reader XMLStreamReader
* @return Object that represents an element
*/
private static Object unmarshalElement(final Unmarshaller u, final XMLStreamReader reader) {
try {
return AccessController.doPrivileged(new PrivilegedAction<Object>() {
public Object run() {
try {
return u.unmarshal(reader);
} catch (OMException e) {
throw e;
} catch (Throwable t) {
throw new OMException(t);
}
}
});
} catch (OMException e) {
throw e;
} catch (Throwable t) {
throw new OMException(t);
}
}
}
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