/*******************************************************************************
* Copyright (c) 1998, 2008 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.internal.jaxb;
import org.eclipse.persistence.sessions.Session;
import org.eclipse.persistence.mappings.DatabaseMapping;
import javax.xml.bind.annotation.DomHandler;
import org.eclipse.persistence.platform.xml.XMLPlatformFactory;
import org.eclipse.persistence.platform.xml.XMLTransformer;
import org.eclipse.persistence.oxm.mappings.converters.XMLConverter;
import org.eclipse.persistence.oxm.XMLUnmarshaller;
import org.eclipse.persistence.oxm.XMLMarshaller;
import org.eclipse.persistence.jaxb.JAXBErrorHandler;
import javax.xml.transform.Source;
import javax.xml.transform.Result;
import javax.xml.transform.dom.DOMResult;
import org.xml.sax.ErrorHandler;
import javax.xml.bind.ValidationEventHandler;
/**
* INTERNAL:
* <p><b>Purpose:</b>Provide support for the JAXB DomHandler API through the use of an EclipseLink
* Converter.
* <p><b>Responsibilities:</b><ul>
* <li>Wrap a provided instance of a DomHandler implementation.</li>
* <li>Invoke the createUnmarshaller method on DomHandler and to a transform on unmarshal</li>
* <li>Invoke the marshal method on the DomHandler on a marshal</li>
* </ul>
*
* @author mmacivor
*
*/
public class DomHandlerConverter implements XMLConverter {
private DomHandler domHandler;
private XMLTransformer xmlTransformer;
private Class<? extends DomHandler> domHandlerClass;
private Class elementClass;
private Class resultType;
public DomHandlerConverter(Class<? extends DomHandler> domHandlerClass) {
this.domHandlerClass = domHandlerClass;
}
public void initialize(DatabaseMapping mapping, Session session) {
try {
this.domHandler = domHandlerClass.newInstance();
java.lang.reflect.Method createUnmarshallerMethod = domHandlerClass.getDeclaredMethod("createUnmarshaller", new Class[]{ValidationEventHandler.class});
resultType = createUnmarshallerMethod.getReturnType();
java.lang.reflect.Method getElementMethod = domHandlerClass.getDeclaredMethod("getElement", new Class[]{resultType});
elementClass = getElementMethod.getReturnType();
xmlTransformer = XMLPlatformFactory.getInstance().getXMLPlatform().newXMLTransformer();
xmlTransformer.setFormattedOutput(true);
} catch(Exception ex) {
//TODO Throw Appropriate Exception
ex.printStackTrace();
}
}
public Object convertDataValueToObjectValue(Object dataValue, Session session, XMLUnmarshaller unmarshaller) {
if(dataValue instanceof org.w3c.dom.Element) {
ErrorHandler handler = unmarshaller.getErrorHandler();
Result result = null;
if(handler != null && handler instanceof JAXBErrorHandler) {
result = domHandler.createUnmarshaller(((JAXBErrorHandler)handler).getValidationEventHandler());
} else {
result = domHandler.createUnmarshaller(null);
}
xmlTransformer.transform((org.w3c.dom.Element)dataValue, result);
Object value = domHandler.getElement(result);
return value;
}
return dataValue;
}
public Object convertObjectValueToDataValue(Object objectValue, Session session, XMLMarshaller marshaller) {
if(elementClass.isAssignableFrom(objectValue.getClass())) {
Source source = domHandler.marshal(objectValue, null);
DOMResult result = new DOMResult();
xmlTransformer.transform(source, result);
return result.getNode();
}
return objectValue;
}
public boolean isMutable() {
return true;
}
public Object convertDataValueToObjectValue(Object dataValue, Session session) {
return null;
}
public Object convertObjectValueToDataValue(Object objectValue, Session session) {
return null;
}
}