gov.nasa.pds.dsview.servlets
Class SwitchingQueryServlet

java.lang.Object
  extended by javax.servlet.GenericServlet
      extended by javax.servlet.http.HttpServlet
          extended by gov.nasa.pds.dsview.servlets.SwitchingQueryServlet
All Implemented Interfaces:
Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public class SwitchingQueryServlet
extends javax.servlet.http.HttpServlet

The switching servlet dispatches an incoming request to a specific web resource depending on the reslcass parameter. At initialization time, the servlet reads each initialization parameter and treats it as a resclass-to-web resource (by path) mapping. It saves each mapping. Then, for any GET or POST request, it looks for the resclass parameter and finds the corresponding web resource path. It then fowards the request to that resource, but without the resclass parameter.

If the resclass parameter is missing or is empty, the result is a 400 (bad request). If the web resource is missing from the web server, the result is a 404 (not found).

Version:
$Revision: 11907 $
Author:
Kelly
See Also:
Serialized Form

Constructor Summary
SwitchingQueryServlet()
           
 
Method Summary
 void doGet(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res)
           
 void doIt(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res)
          Examine the resclass parameter and forward to the mapped web context resource.
 void doPost(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res)
           
 void init(javax.servlet.ServletConfig config)
          Initialize the resource mappings.
 
Methods inherited from class javax.servlet.http.HttpServlet
doDelete, doHead, doOptions, doPut, doTrace, getLastModified, service, service
 
Methods inherited from class javax.servlet.GenericServlet
destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SwitchingQueryServlet

public SwitchingQueryServlet()
Method Detail

init

public void init(javax.servlet.ServletConfig config)
          throws javax.servlet.ServletException
Initialize the resource mappings. Each init parameter maps a resclass to a web context resource.

Specified by:
init in interface javax.servlet.Servlet
Overrides:
init in class javax.servlet.GenericServlet
Parameters:
config - a ServletConfig value.
Throws:
javax.servlet.ServletException - if an error occurs.

doGet

public void doGet(javax.servlet.http.HttpServletRequest req,
                  javax.servlet.http.HttpServletResponse res)
           throws javax.servlet.ServletException,
                  IOException
Overrides:
doGet in class javax.servlet.http.HttpServlet
Throws:
javax.servlet.ServletException
IOException

doPost

public void doPost(javax.servlet.http.HttpServletRequest req,
                   javax.servlet.http.HttpServletResponse res)
            throws javax.servlet.ServletException,
                   IOException
Overrides:
doPost in class javax.servlet.http.HttpServlet
Throws:
javax.servlet.ServletException
IOException

doIt

public void doIt(javax.servlet.http.HttpServletRequest req,
                 javax.servlet.http.HttpServletResponse res)
          throws javax.servlet.ServletException,
                 IOException
Examine the resclass parameter and forward to the mapped web context resource.

Parameters:
req - a HttpServletRequest value.
res - a HttpServletResponse value.
Throws:
javax.servlet.ServletException - if an error occurs.
IOException - if an error occurs.


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