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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;
import java.io.OutputStream;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import org.apache.axiom.om.OMDataSourceExt;
import org.apache.axiom.om.OMOutputFormat;
import org.apache.axiom.om.ds.OMDataSourceExtBase;
import org.apache.axiom.om.impl.MTOMXMLStreamWriter;
import org.apache.axiom.om.util.StAXUtils;
import org.apache.tuscany.sca.databinding.jaxb.JAXBContextHelper;
/**
*
* @version $Rev$ $Date$
*/
public class JAXBDataSource extends OMDataSourceExtBase {
private JAXBContext context;
private Object element;
public JAXBDataSource(Object element, JAXBContext context) {
this.element = element;
this.context = context;
}
private Marshaller getMarshaller() throws JAXBException {
return JAXBContextHelper.getMarshaller(context);
}
private void releaseMarshaller(Marshaller marshaller) {
JAXBContextHelper.releaseJAXBMarshaller(context, marshaller);
}
public XMLStreamReader getReader() throws XMLStreamException {
// FIXME: [rfeng] This is a quick and dirty implementation
// We could use the fastinfoset to optimize the roundtrip
StringWriter writer = new StringWriter();
serialize(writer, new OMOutputFormat());
StringReader reader = new StringReader(writer.toString());
return StAXUtils.createXMLStreamReader(reader);
}
/**
* 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();
}
try {
Method method = writer.getClass().getMethod("getOutputStream");
return (OutputStream)method.invoke(writer);
} catch (NoSuchMethodException e) {
return null;
} catch (Exception e) {
return null;
}
}
public void serialize(final XMLStreamWriter xmlWriter) throws XMLStreamException {
try {
// marshaller.setProperty(Marshaller.JAXB_ENCODING, format.getCharSetEncoding());
AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() {
public Object run() throws Exception {
Marshaller marshaller = null;
try {
marshaller = getMarshaller();
// Marshalling directly to the output stream is faster than marshalling through the
// XMLStreamWriter. Take advantage of this optimization if there is an output stream.
OutputStream os = getOutputStream(xmlWriter);
if (os != null) {
marshaller.marshal(element, os);
} else {
marshaller.marshal(element, xmlWriter);
}
} finally {
releaseMarshaller(marshaller);
}
return null;
}
});
} catch (PrivilegedActionException e) {
throw new XMLStreamException(e.getException());
}
}
public void serialize(final OutputStream output, OMOutputFormat format) throws XMLStreamException {
try {
// marshaller.setProperty(Marshaller.JAXB_ENCODING, format.getCharSetEncoding());
AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() {
public Object run() throws Exception {
Marshaller marshaller = null;
try {
marshaller = getMarshaller();
marshaller.marshal(element, output);
} finally {
releaseMarshaller(marshaller);
}
return null;
}
});
} catch (PrivilegedActionException e) {
throw new XMLStreamException(e.getException());
}
}
public void serialize(final Writer writer, OMOutputFormat format) throws XMLStreamException {
try {
AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() {
public Object run() throws Exception {
Marshaller marshaller = null;
try {
marshaller = getMarshaller();
marshaller.marshal(element, writer);
} finally {
releaseMarshaller(marshaller);
}
return null;
}
});
} catch (PrivilegedActionException e) {
throw new XMLStreamException(e.getException());
}
}
public Object getObject() {
return element;
}
public void close() {
}
public OMDataSourceExt copy() {
return new JAXBDataSource(element, context);
}
public byte[] getXMLBytes(final String encoding) throws UnsupportedEncodingException {
try {
return AccessController.doPrivileged(new PrivilegedExceptionAction<byte[]>() {
public byte[] run() throws JAXBException, XMLStreamException, UnsupportedEncodingException {
Marshaller marshaller = null;
try {
StringWriter sw = new StringWriter();
marshaller = getMarshaller();
marshaller.marshal(element, sw);
return sw.toString().getBytes(encoding);
} finally {
releaseMarshaller(marshaller);
}
}
});
} catch (PrivilegedActionException e) {
Throwable t = e.getCause();
if (t instanceof UnsupportedEncodingException) {
throw (UnsupportedEncodingException)t;
} else {
throw new RuntimeException(t);
}
}
}
public boolean isDestructiveRead() {
return false;
}
public boolean isDestructiveWrite() {
return false;
}
}
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