modules/databinding-sdo-axiom/src/main/java/org/apache/tuscany/sca/databinding/sdo2om/SDODataSource.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.sdo2om;

import static org.apache.tuscany.sca.databinding.sdo.SDODataBinding.ROOT_ELEMENT;

import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;

import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;

import org.apache.axiom.om.OMDataSource;
import org.apache.axiom.om.OMOutputFormat;
import org.apache.axiom.om.impl.serialize.StreamingOMSerializer;
import org.apache.tuscany.sdo.api.SDOUtil;
import org.apache.tuscany.sdo.api.XMLStreamHelper;

import commonj.sdo.DataObject;
import commonj.sdo.helper.HelperContext;
import commonj.sdo.helper.XMLDocument;

/**
 *
 * @version $Rev$ $Date$
 */
public class SDODataSource implements OMDataSource {
    private HelperContext helperContext;
    private XMLDocument sourceDocument;

    public SDODataSource(XMLDocument source, HelperContext helperContext) {
        this.sourceDocument = source;
        this.helperContext = helperContext;
    }

    public SDODataSource(DataObject obj, HelperContext helperContext) {
        this.helperContext = helperContext;
        this.sourceDocument =
            helperContext.getXMLHelper().createDocument(obj,
                                                        ROOT_ELEMENT.getNamespaceURI(),
                                                        ROOT_ELEMENT.getLocalPart());
    }

    public XMLStreamReader getReader() throws XMLStreamException {
        XMLStreamHelper streamHelper = SDOUtil.createXMLStreamHelper(helperContext);
        return streamHelper.createXMLStreamReader(sourceDocument);
    }

    public void serialize(XMLStreamWriter xmlWriter) throws XMLStreamException {
        StreamingOMSerializer serializer = new StreamingOMSerializer();
        serializer.serialize(getReader(), xmlWriter);
    }

    public void serialize(OutputStream output, OMOutputFormat format) throws XMLStreamException {
        try {
            helperContext.getXMLHelper().save(sourceDocument, output, null);
        } catch (Exception e) {
            throw new XMLStreamException(e);
        }
    }

    public void serialize(Writer writer, OMOutputFormat format) throws XMLStreamException {
        try {
            helperContext.getXMLHelper().save(sourceDocument, writer, null);
        } catch (IOException e) {
            throw new XMLStreamException(e);
        }
    }

}