/*

  * Copyright 2001-2004 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.ws.scout.transport;

 import java.lang.reflect.Method;

 import java.net.URI;

 import java.util.Properties;

 import javax.naming.InitialContext;

 import javax.xml.parsers.DocumentBuilder;

 import javax.xml.parsers.DocumentBuilderFactory;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import org.apache.ws.scout.util.XMLUtils;

 import org.w3c.dom.Document;

 import org.w3c.dom.Element;

 import org.w3c.dom.Node;

 /**

  * RMI Message transport class.

  * 

  * <p>This transport calls jUDDI using RMI.</p>

  * 

  * @author Kurt Stam (kurt.stam@redhat.com)

  */

 public class RMITransport implements Transport

 {

   // private reference to the jUDDI logger

   private static Log log = LogFactory.getLog(RMITransport.class);

   /** 

    * Sends an element and returns an element.

    */

   public Element send(Element request,URI endpointURI)

     throws TransportException

   {    

     Element response = null;

     if (log.isDebugEnabled()) {

             log.debug("\nRequest message:\n" + XMLUtils.convertNodeToXMLString(request));

             log.debug("Calling " + endpointURI + " using rmi");

     }

     try {

                 String host       = endpointURI.getHost();

                 int port          = endpointURI.getPort();

                 String scheme     = endpointURI.getScheme();

             String service    = endpointURI.getPath();

             String className  = endpointURI.getQuery();

             String methodName = endpointURI.getFragment();

             Properties env    = new Properties();

             //It be a lot nicer if this is configured through properties, but for now

             //I'd like to keep the changes localized, so this seems pretty reasonable.

             String factoryInitial = SecurityActions.getProperty("java.naming.factory.initial");

         if (factoryInitial==null) factoryInitial = "org.jnp.interfaces.NamingContextFactory";

         String factoryURLPkgs = SecurityActions.getProperty("java.naming.factory.url.pkgs");

         if (factoryURLPkgs==null) factoryURLPkgs = "org.jboss.naming";

         env.setProperty("java.naming.factory.initial", factoryInitial);

         env.setProperty("java.naming.factory.url.pkgs", factoryURLPkgs);

             env.setProperty("java.naming.provider.url", scheme + "://" + host + ":" + port);

             log.debug("Initial Context using env=" + env.toString());

             InitialContext context = new InitialContext(env);

             log.debug("Calling service=" + service + ", Class = " + className + ", Method=" + methodName);

             //Looking up the object (i.e. Publish)

             Object requestHandler = context.lookup(service);

             //Loading up the stub

             Class<?> c = Class.forName(className);

             //Getting a handle to method we want to call (i.e. publish.publish(Element element))

             Method method = c.getMethod(methodName, Element.class);

             //Calling that method

             Node node = (Node) method.invoke(requestHandler, request);

             //The result is in the first element

             if (node.getFirstChild()!=null) {

                     response = (Element) node.getFirstChild();

             }

     }

     catch (Exception ex) {

       throw new TransportException(ex);

     }

     if (log.isDebugEnabled()) {

             log.debug("\nResponse message:\n" + XMLUtils.convertNodeToXMLString(response));

     }

     return response;

   }

   /**

    * Sends an XML, responds with an XML.

    */

   public String send(String request,URI endpointURI)

     throws TransportException

   {    

     String response = null;

     log.debug("\nRequest message:\n" + request);

     try {

             DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

         DocumentBuilder parser = factory.newDocumentBuilder();

         Document document = parser.parse(request);

         Element element = document.getDocumentElement();

         response= XMLUtils.convertNodeToXMLString(send(element, endpointURI));

     } catch (Exception ex) { 

             throw new TransportException(ex);

     }

     log.debug("\nResponse message:\n" + response);

     return response;

   }

 }