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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.sdo.helper;
import java.util.Map;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import org.apache.tuscany.sdo.util.resource.DataObjectXMLStreamReader;
import org.apache.tuscany.sdo.util.resource.XMLDocumentStreamReader;
import org.apache.tuscany.sdo.util.resource.XMLStreamSerializer;
import org.eclipse.emf.ecore.resource.Resource;
import commonj.sdo.DataObject;
import commonj.sdo.Property;
import commonj.sdo.helper.HelperContext;
import commonj.sdo.helper.XMLDocument;
/**
* @version $Rev$ $Date$
*/
public class XMLStreamHelperImpl implements XMLStreamHelper {
protected HelperContext helperContext;
public XMLStreamHelperImpl(HelperContext hc) {
this.helperContext = hc;
}
private Map checkSetOptions(Map options) {
if (helperContext != null) {
return ((HelperContextImpl)helperContext).getMergedOption(options);
} else {// null is acceptable as it will be ignored
return options;
}
}
public XMLDocument load(XMLStreamReader reader) throws XMLStreamException, IllegalStateException {
if (reader.getEventType() != XMLStreamConstants.START_DOCUMENT)
throw new IllegalStateException();
return loadDocument(reader, null);
}
public void save(XMLDocument document, XMLStreamWriter writer) throws XMLStreamException {
XMLStreamReader reader = createXMLStreamReader(document);
new XMLStreamSerializer().serialize(reader, writer);
}
public void save(XMLDocument document, XMLStreamWriter writer, Map options) throws XMLStreamException {
XMLStreamReader reader = createXMLStreamReader(document);
options = checkSetOptions(options);
new XMLStreamSerializer().serialize(reader, writer, options);
}
public XMLStreamReader createXMLStreamReader(XMLDocument document) throws XMLStreamException {
XMLStreamReader reader =
new DataObjectXMLStreamReader(document.getRootObject(), document.getRootElementURI(), document
.getRootElementName(), helperContext.getTypeHelper());
// Wrap the reader so that its position will be START_ELEMENT
return new XMLDocumentStreamReader(reader);
}
public final DataObject loadObject(XMLStreamReader reader, Map options) throws XMLStreamException,
IllegalStateException {
if (reader.getEventType() != XMLStreamConstants.START_ELEMENT)
throw new IllegalStateException();
// StAX2SAXAdapter won't produce START_DOCUMENT if the reader is
// posisitioned at START_ELEMENT and the EMF loader will fail
// Wrap the reader so it represents a document
reader = new XMLDocumentStreamReader(reader);
return loadDocument(reader, options).getRootObject();
}
public DataObject loadObject(XMLStreamReader reader) throws XMLStreamException, IllegalStateException {
return loadObject(reader, null);
}
public void saveObject(DataObject sdo, XMLStreamWriter writer) throws XMLStreamException {
XMLStreamReader reader = createXMLStreamReader(sdo);
new XMLStreamSerializer().serialize(new XMLDocumentStreamReader(reader), writer);
}
public void saveObject(DataObject sdo, XMLStreamWriter writer, Map options) throws XMLStreamException {
XMLStreamReader reader = createXMLStreamReader(sdo);
options = checkSetOptions(options);
new XMLStreamSerializer().serialize(new XMLDocumentStreamReader(reader), writer, options);
}
public XMLStreamReader createXMLStreamReader(DataObject dataObject) {
if (dataObject == null) {
return null;
}
String rootElementURI;
String rootElementName;
Property property = dataObject.getContainmentProperty();
if (property != null) {
rootElementName = property.getName();
rootElementURI = property.getType().getURI();
} else {
rootElementName = dataObject.getType().getName();
rootElementURI = dataObject.getType().getURI();
}
return new DataObjectXMLStreamReader(dataObject, rootElementURI, rootElementName, helperContext.getTypeHelper());
}
protected XMLDocument loadDocument(XMLStreamReader reader, Map options) throws XMLStreamException {
try {
XMLDocumentImpl document = new XMLDocumentImpl(((HelperContextImpl)helperContext).extendedMetaData, null);
options = checkSetOptions(options);
document.load(reader, options);
return document;
} catch (Exception e) {
if (e instanceof Resource.IOWrappedException) {
Resource.IOWrappedException ioe = (Resource.IOWrappedException)e;
if (ioe.getWrappedException() instanceof XMLStreamException) {
throw (XMLStreamException)ioe.getWrappedException();
}
}
throw new RuntimeException(e); // ????
}
}
public HelperContext getHelperContext() {
return helperContext;
}
}
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