/*
    * EL4J, the Extension Library for the J2EE, adds incremental enhancements to
    * the spring framework, http://el4j.sf.net
    * Copyright (C) 2006 by ELCA Informatique SA, Av. de la Harpe 22-24,
    * 1000 Lausanne, Switzerland, http://www.elca.ch
    *
    * EL4J is published under the GNU Lesser General Public License (LGPL)
    * Version 2.1. See http://www.gnu.org/licenses/
    *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   * GNU Lesser General Public License for more details.
   *
   * For alternative licensing, please contact info@elca.ch
   */
  package ch.elca.el4j.services.remoting.servlet;
  
  import java.util.LinkedHashSet;
  import java.util.Map;
  import java.util.Set;
  
  import javax.servlet.ServletConfig;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.springframework.web.context.WebApplicationContext;
  import org.springframework.web.context.support.WebApplicationContextUtils;
  
  import com.sun.xml.ws.transport.http.servlet.ServletAdapterList;
  import com.sun.xml.ws.transport.http.servlet.SpringBinding;
  import com.sun.xml.ws.transport.http.servlet.WSServletDelegate;
  
  import ch.elca.el4j.services.remoting.RemotingServiceExporter;
  import ch.elca.el4j.services.remoting.protocol.Jaxws;
  
  /**
   * This class represents a customized JAX-WS {@link HttpServlet}. Instead of
   * using the {@link SpringBinding}s specified in special Spring XML format,
   * this class searches for JAX-WS bindings in el4j-remoting-protocol form.
   *
   * Remark: This class cannot extend ModuleContextLoaderServlet because
   * doPost, doGet, doPut and doDelete are final.
   *
   * @svnLink $Revision: 3884 $;$Date: 2009-08-04 15:48:31 +0200 (Di, 04. Aug 2009) $;$Author: swismer $;$URL: https://el4j.svn.sourceforge.net/svnroot/el4j/branches/el4j_3_1/el4j/framework/modules/remoting_jaxws/src/main/java/ch/elca/el4j/services/remoting/servlet/WSSpringServlet.java $
   *
   * @author Stefan Wismer (SWI)
   */
  public class WSSpringServlet extends HttpServlet {
  
  	/**
  	 * The servlet delegate.
  	 */
  	private WSServletDelegate m_delegate;
  
  	
  	/** {@inheritDoc} */
  	public void init(ServletConfig servletConfig) throws ServletException {
  		super.init(servletConfig);
  
  		// get the configured adapters from Spring
  		WebApplicationContext wac = WebApplicationContextUtils
  			.getRequiredWebApplicationContext(getServletContext());
  
  		Set<SpringBinding> bindings = new LinkedHashSet<SpringBinding>();
  
  		// search for Jaxws RemotingServiceExporter objects
  		Map<?, ?> map = wac.getBeansOfType(RemotingServiceExporter.class);
  		for (Object beanName : map.keySet()) {
  			RemotingServiceExporter exporter
  				= (RemotingServiceExporter) map.get(beanName);
  			
  			if (exporter.getRemoteProtocol() instanceof Jaxws) {
  				try {
  					SpringBinding binding = (SpringBinding) exporter.getObject();
  					if (binding != null) {
  						bindings.add(binding);
  					}
  				} catch (Exception e) {
  					// ignore invalid binding
  					log("Could not create JAX-WS Spring binding for bean '"
  						+ ((String) beanName).substring(1) + "'");
  				}
  			}
  		}
  		
  		// bindings declared in the jaxws-spring manner
  		bindings.addAll(wac.getBeansOfType(SpringBinding.class).values());
  
  		// create adapters
  		ServletAdapterList l = new ServletAdapterList();
  		for (SpringBinding binding : bindings) {
  			binding.create(l);
  		}
  
  		m_delegate = new WSServletDelegate(l, getServletContext());
  	}
 
 	/** {@inheritDoc} */
 	protected void doPost(HttpServletRequest request,
 		HttpServletResponse response) throws ServletException {
 		m_delegate.doPost(request, response, getServletContext());
 	}
 
 	/** {@inheritDoc} */
 	protected void doGet(HttpServletRequest request,
 		HttpServletResponse response) throws ServletException {
 		m_delegate.doGet(request, response, getServletContext());
 	}
 
 	/** {@inheritDoc} */
 	protected void doPut(HttpServletRequest request,
 		HttpServletResponse response) throws ServletException {
 		m_delegate.doPut(request, response, getServletContext());
 	}
 
 	/** {@inheritDoc} */
 	protected void doDelete(HttpServletRequest request,
 		HttpServletResponse response) throws ServletException {
 		m_delegate.doDelete(request, response, getServletContext());
 	}
 }