/*
* Copyright 2013 Red Hat Inc. and/or its affiliates and other contributors.
*
* 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.switchyard.component.sca;
import java.io.StringReader;
import java.io.StringWriter;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.soap.MessageFactory;
import javax.xml.soap.Name;
import javax.xml.soap.SOAPEnvelope;
import javax.xml.soap.SOAPHeader;
import javax.xml.soap.SOAPHeaderElement;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.oasis_open.docs.ws_tx.wscoor._2006._06.CoordinationContextType;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import com.arjuna.mw.wst11.common.CoordinationContextHelper;
import com.arjuna.webservices11.wscoor.CoordinationConstants;
/**
* Serialize/Deserialize the transaction context to be propagated via remote invocation.
*/
public class TransactionContextSerializer {
/**
* HTTP header used to communicate the transaction context to be propagated.
*/
public static final String HEADER_TXCONTEXT = "switchyard-transaction-context";
/**
* Serialize the transaction context as a XML String.
* @param cc CoordinationContextType
* @return String representation of XML transaction context
* @throws Exception if it fails to serialise
*/
public String serialise(CoordinationContextType cc) throws Exception {
SOAPEnvelope soapenv = MessageFactory.newInstance().createMessage().getSOAPPart().getEnvelope();
SOAPHeader header = soapenv.getHeader();
if (header == null) {
header = soapenv.addHeader();
}
final Name name = soapenv.createName(CoordinationConstants.WSCOOR_ELEMENT_COORDINATION_CONTEXT, CoordinationConstants.WSCOOR_PREFIX, CoordinationConstants.WSCOOR_NAMESPACE);
final SOAPHeaderElement root = header.addHeaderElement(name);
root.addNamespaceDeclaration(CoordinationConstants.WSCOOR_PREFIX, CoordinationConstants.WSCOOR_NAMESPACE);
/*
* TODO Is it possible to craft plain DOM element but not to create whole SOAPMessage?
* following code hits an NPE in the CoordinationContextHelper.serialise() when it invokes
* getPrefix().equals("xmlns") against the attribute generated by JAXB marshaller.
*
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
Document doc = factory.newDocumentBuilder().newDocument();
Element root = doc.createElement(CoordinationConstants.WSCOOR_PREFIX + ":" + CoordinationConstants.WSCOOR_ELEMENT_COORDINATION_CONTEXT);
root.setAttribute("xmlns:" + CoordinationConstants.WSCOOR_PREFIX, CoordinationConstants.WSCOOR_NAMESPACE);
*/
CoordinationContextHelper.serialise(cc, root);
StringWriter sw = new StringWriter();
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.transform(new DOMSource(root), new StreamResult(sw));
return sw.toString();
}
/**
* Deserialize the transaction context from a XML String.
* @param header XML String to be parsed
* @return CoordinationContextType
* @throws Exception if it fails to deserialise
*/
public CoordinationContextType deserialise(String header) throws Exception {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
Document doc = factory.newDocumentBuilder().parse(new InputSource(new StringReader(header)));
return CoordinationContextHelper.deserialise(doc.getDocumentElement());
}
}