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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.xstream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import javax.xml.namespace.QName;
import org.apache.axiom.om.OMAbstractFactory;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMFactory;
import org.apache.axiom.om.OMNamespace;
import org.apache.axiom.om.impl.builder.StAXOMBuilder;
import org.apache.tuscany.sca.databinding.PullTransformer;
import org.apache.tuscany.sca.databinding.TransformationContext;
import org.apache.tuscany.sca.databinding.TransformationException;
import org.apache.tuscany.sca.databinding.impl.BaseTransformer;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.util.XMLType;
import com.thoughtworks.xstream.XStream;
/**
* XObject --> AXIOM OMElement transformer
*
* @version $Rev$ $Date$
*/
public class XObject2OMElement extends BaseTransformer<XObject, OMElement> implements
PullTransformer<XObject, OMElement> {
public OMElement transform(XObject source, TransformationContext context) {
MetaObject mj = new MetaObjectImpl(source);
OMElement element = null;
ByteArrayOutputStream out = new ByteArrayOutputStream();
XStream xs = new XStream();
xs.alias("xobject", mj.getClass());
xs.toXML(mj, out);
/* TODO: Maybe a base64 conversion...? or not?
* ie. new ByteArrayInputStream(Utils.toBase64(out.toByteArray()).getBytes())
*/
try {
// what's better this one:
StAXOMBuilder builder = new StAXOMBuilder(new ByteArrayInputStream(out.toByteArray()));
// or this one:
// StaAXOMBuilder builder = new StAXOMBuilder(new ByteArrayInputStream(Utils.toBase64(out.toByteArray()).getBytes()))
element = builder.getDocumentElement();
adjustElementName(context, element);
} catch (Exception e) {
throw new TransformationException(e);
}
return element;
}
private static void adjustElementName(TransformationContext context, OMElement element) {
if (context != null) {
DataType dataType = context.getTargetDataType();
Object logical = dataType == null ? null : dataType.getLogical();
if (!(logical instanceof XMLType)) {
return;
}
XMLType xmlType = (XMLType)logical;
if (xmlType.isElement() && !xmlType.getElementName().equals(element.getQName())) {
// FIXME:: Throw exception or switch to the new Element?
OMFactory factory = OMAbstractFactory.getOMFactory();
QName name = xmlType.getElementName();
OMNamespace namespace = factory.createOMNamespace(name.getNamespaceURI(), name.getPrefix());
element.setNamespace(namespace);
element.setLocalName(name.getLocalPart());
}
}
}
@Override
public Class<XObject> getSourceType() {
return XObject.class;
}
@Override
public Class<OMElement> getTargetType() {
return OMElement.class;
}
@Override
public int getWeight() {
return 10;
}
}
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