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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.saxon;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.stream.StreamSource;
import net.sf.saxon.om.NodeInfo;
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 commonj.sdo.DataObject;
import commonj.sdo.helper.XMLHelper;
import commonj.sdo.impl.HelperProvider;
/**
* Transforms SDO DataObject-s to NodeInfo objects needed by Saxon parser
* @version $Rev$ $Date$
* For root element when serializing the DataObject the name of its
* implemented interface is used with its first letter made lowercase.
* Also any namespaces that are defined are deleted, because otherwise
* the SaxonB parser does not work
*/
public class DataObject2NodeInfoTransformer extends
BaseTransformer<DataObject, NodeInfo> implements
PullTransformer<DataObject, NodeInfo> {
private Node2NodeInfoTransformer node2NodeInfoTransformer;
public DataObject2NodeInfoTransformer(Node2NodeInfoTransformer node2NodeInfoTransformer) {
this.node2NodeInfoTransformer = node2NodeInfoTransformer;
}
public NodeInfo transform(DataObject source, TransformationContext context) {
XMLHelper helper = HelperProvider.INSTANCE.xmlHelper();
String name = null;
if(source.getClass().getInterfaces().length > 0) {
name = source.getClass().getInterfaces()[0].getSimpleName();
} else {
name = source.getClass().getName();
}
if(name.length() > 0) {
name = Character.toLowerCase(name.charAt(0)) + name.substring(1, name.length());
}
DOMResult domResult = new DOMResult();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
helper.save(source, null, name, baos);
baos.flush();
baos.close();
} catch (IOException e) {
throw new TransformationException(e);
}
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
Source src = new StreamSource(bais);
try {
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.transform(src, domResult);
} catch (TransformerConfigurationException e) {
throw new TransformationException(e);
} catch (TransformerFactoryConfigurationError e) {
throw new TransformationException(e);
} catch (TransformerException e) {
throw new TransformationException(e);
}
return node2NodeInfoTransformer.transform(domResult.getNode(), context);
}
@Override
protected Class getSourceType() {
return DataObject.class;
}
@Override
protected Class getTargetType() {
return NodeInfo.class;
}
@Override
public int getWeight() {
return 10;
}
}
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