modules/databinding-jaxb/src/main/java/org/apache/tuscany/sca/databinding/jaxb/JAXB2OutputStream.java

/*
 * 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;

import java.io.OutputStream;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;

import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.databinding.BaseTransformer;
import org.apache.tuscany.sca.databinding.PushTransformer;
import org.apache.tuscany.sca.databinding.TransformationContext;
import org.apache.tuscany.sca.databinding.TransformationException;

/**
 * @version $Rev$ $Date$
 */
public class JAXB2OutputStream extends BaseTransformer<Object, OutputStream> implements
    PushTransformer<Object, OutputStream> {

    private JAXBContextHelper contextHelper;
    
    public JAXB2OutputStream(ExtensionPointRegistry registry) {
        contextHelper = JAXBContextHelper.getInstance(registry);
    }
    
    @Override
    protected Class<Object> getSourceType() {
        return Object.class;
    }

    @Override
    protected Class<OutputStream> getTargetType() {
        return OutputStream.class;
    }

    /**
     * @see org.apache.tuscany.sca.databinding.PushTransformer#transform(java.lang.Object, java.lang.Object, org.apache.tuscany.sca.databinding.TransformationContext)
     */
    public void transform(Object source, OutputStream target, TransformationContext tContext) {
        try {
            JAXBContext context = contextHelper.createJAXBContext(tContext, true);
            Object jaxbElement = JAXBContextHelper.createJAXBElement(context, tContext.getSourceDataType(), source);
            Marshaller marshaller = contextHelper.getMarshaller(context);
            marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.FALSE);
            try {
                marshaller.marshal(jaxbElement, target);
            } finally {
                contextHelper.releaseJAXBMarshaller(context, marshaller);
            }
        } catch (Exception e) {
            throw new TransformationException(e);
        }
    }

    @Override
    public int getWeight() {
        return 20;
    }

    @Override
    public String getSourceDataBinding() {
        return JAXBDataBinding.NAME;
    }
}