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/**
*
* Copyright 2006 The Apache Software Foundation
*
* Licensed 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.sdo;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import commonj.sdo.DataObject;
import commonj.sdo.helper.XMLDocument;
/**
* Helper interface for reading and writing SDO DataObjects from XML streams.
*
* @version $Rev$ $Date$
*/
public interface XMLStreamHelper {
/**
* Creates and returns an XMLDocument from an XML input stream.
* The reader must be positioned on a START_DOCUMENT event.
*
* @param reader the stream to read
* @return an XMLDocument created from the stream
* @throws XMLStreamException if there was a problem reading the stream
* @throws IllegalStateException if the reader is not positioned on a START_DOCUMENT event
*/
XMLDocument load(XMLStreamReader reader) throws XMLStreamException, IllegalStateException;
/**
* Save a XMLDocument to an XML stream.
*
* @param document the document to be written
* @param writer the stream to write to
* @throws XMLStreamException if there was a problem writing to the stream
*/
void save(XMLDocument document, XMLStreamWriter writer) throws XMLStreamException;
/**
* Creates and returns a XMLStreamReader that can be used to read an XMLDocument as a XML event stream.
* The reader will be positioned on a START_DOCUMENT event.
*
* @param document the XMLDocument to be read
* @return an XMLStreamReader that can be used to read the document
*/
XMLStreamReader createXMLStreamReader(XMLDocument document) throws XMLStreamException;
/**
* Create a DataObject from an element in a XML stream.
* The reader must be positioned on a START_ELEMENT event.
*
* @param reader the stream to read
* @return a DataObject created from the element in the stream
* @throws XMLStreamException if there was a problem reading the stream
* @throws IllegalStateException if the reader is not positioned on a START_ELEMENT event
*/
DataObject loadObject(XMLStreamReader reader) throws XMLStreamException, IllegalStateException;
/**
* Save a DataObject to an XML stream.
*
* @param sdo the DataObject to be written
* @param writer the stream to write to
* @throws XMLStreamException if there was a problem writing to the stream
*/
void saveObject(DataObject sdo, XMLStreamWriter writer) throws XMLStreamException;
/**
* Creates and returns a XMLStreamReader that can be used to read a DataObject as a XML event stream.
* The reader will be positioned on a START_ELEMENT event.
*
* @param sdo the DataObject to be read
* @return an XMLStreamReader that can be used to read the DataObject
*/
XMLStreamReader createXMLStreamReader(DataObject sdo);
}
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