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package com.ericsson.ssa.config;
import com.ericsson.ssa.sip.ServiceHandler;
import com.ericsson.ssa.sip.SipApplicationSessionImpl;
import com.ericsson.ssa.sip.SipServletRequestImpl;
import com.ericsson.ssa.sip.SipServletResponseImpl;
import com.ericsson.ssa.sip.SipSessionDialogImpl;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.sip.SipServletRequest;
import javax.servlet.sip.SipServletResponse;
/**
* This dispatcher handles forwarding of SIP requests/responses according to SSA
* 1.0 section 10.2.5. According to that specification the
* {@link #include(ServletRequest, ServletResponse)} have no meaning in the SIP
* context.
*/
public class SipRequestDispatcher implements RequestDispatcher {
private String servletName;
private ServiceHandler serviceHandler;
/**
* Create a dispatcher for the SIP servlet with the specified name.
*
* @param servletName
* name of servlet
* @param serviceHandler
* the service handler via which servlets can be invoked
*/
public SipRequestDispatcher(String servletName,
ServiceHandler serviceHandler) {
this.servletName = servletName;
this.serviceHandler = serviceHandler;
}
/**
* {@inheritDoc}
*/
public void forward(ServletRequest request, ServletResponse response)
throws ServletException, IOException {
SipApplicationSessionImpl session = null;
if (request != null) {
if (request instanceof SipServletRequestImpl) {
session = (SipApplicationSessionImpl) ((SipServletRequestImpl) request).getApplicationSession();
} else {
throw new IllegalArgumentException(
"Only SIP requests are allowed.");
}
}
if (response != null) {
if (response instanceof SipServletResponseImpl) {
if (session == null) {
session = (SipApplicationSessionImpl) ((SipServletResponseImpl) response).getApplicationSession();
}
} else {
throw new IllegalArgumentException(
"Only SIP responses are allowed.");
}
}
if (session == null) {
throw new IllegalArgumentException(
"A SIP request or a SIP response must be supplied.");
}
Servlet servlet = serviceHandler.getHandler(session.getName(),
servletName);
if (servlet == null) {
throw new IllegalStateException("SIP servlet " + servletName +
" not found.");
}
// Set the new servlet as handler in the Dialog for Application Path, UAS/Proxy
SipSessionDialogImpl dialog = (SipSessionDialogImpl) ((SipServletRequest) request).getSession();
dialog.setHandler(servletName);
// Set servlet as currentServlet in the ApplicationSesson, used for UAC case
session.setCurrentServlet(servletName);
servlet.service(request, response);
}
/**
* This method has no meaning in the SIP context according to SSA 1.0 section
* 10.2.5
*/
public void include(ServletRequest request, ServletResponse response)
throws ServletException, IOException {
throw new UnsupportedOperationException(
"This method have no meaning for SIP servlets");
}
}