com.jcorporate.expresso.core.servlet.viewhandler
Class ViewHandler

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          com.jcorporate.expresso.core.servlet.StdServlet
              com.jcorporate.expresso.core.servlet.DBServlet
                  com.jcorporate.expresso.core.servlet.viewhandler.ViewHandler

All Implemented Interfaces:

Serializable, Servlet, ServletConfig

Direct Known Subclasses:

DefaultViewHandler, JSPViewHandler, XMLViewHandler

public abstract class ViewHandler

extends DBServlet

See Also:

Serialized Form

Field Summary

Fields inherited from class com.jcorporate.expresso.core.servlet.DBServlet

thisClass

Fields inherited from class com.jcorporate.expresso.core.servlet.StdServlet

mySchema

Constructor Summary

ViewHandler()

Method Summary

void	doGet(HttpServletRequest request, HttpServletResponse response) Both GET and POST for the ViewHandler simply pass the information from parameters and form fields on to the named controller object.
void	doPost(HttpServletRequest req, HttpServletResponse res) Handle POST method, typically from a form.
String	getTitle() Ancestors of this class override this method to return a specific title that is used by the security administration Controllers to describe the servlet
abstract void	handleView(ControllerResponse con, HttpServletRequest req, HttpServletResponse res) The ViewHandler implementation must implement only this method
void	process(HttpServletRequest request, HttpServletResponse response) This is a master method that is does the processing for both GET and POST.

Methods inherited from class com.jcorporate.expresso.core.servlet.DBServlet

destroy, getDBName, init, requireLogin, setDBName, setSkipLogin, setupChannels

Methods inherited from class com.jcorporate.expresso.core.servlet.StdServlet

getSchema, getServerName, getServerPort, getServletPrefix, getServletPrefix, getString, getString, handleParam, setSchema, showError, showError

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

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

ViewHandler

public ViewHandler()

Method Detail

handleView

public abstract void handleView(ControllerResponse con,
                                HttpServletRequest req,
                                HttpServletResponse res)
                         throws ServletException,
                                IOException,
                                ControllerException,
                                NonHandleableException

The ViewHandler implementation must implement only this method

Throws:

ServletException

IOException

ControllerException

NonHandleableException

doGet

public void doGet(HttpServletRequest request,
                  HttpServletResponse response)
           throws ServletException,
                  IOException

Both GET and POST for the ViewHandler simply pass the information from parameters and form fields on to the named controller object. The Controller object passes back a series of Inputs, Outputs and Actions that are a result of the requested Controller

Overrides:

doGet in class DBServlet

Parameters:

request - Standard request object

response - Standard response object

Throws:

ServletException - If an uncaught exception occurs

IOException - If an I/O error occurs while communicating with the client

doPost

public void doPost(HttpServletRequest req,
                   HttpServletResponse res)
            throws ServletException,
                   IOException

Handle POST method, typically from a form. The only difference between get and post in this servlet is that when processing post, we look for a parameter with a name of the form "button_xxx", where xxx is the next state, as the state to controller into might vary depending on what button the user presses.

Overrides:

doPost in class DBServlet

Parameters:

req - Standard request object

res - Standard response object

Throws:

ServletException - If an uncaught exception occurs

IOException - If an I/O error occurs while communicating with the client

getTitle

public String getTitle()

Description copied from class: StdServlet

Ancestors of this class override this method to return a specific title that is used by the security administration Controllers to describe the servlet

Overrides:

getTitle in class StdServlet

Returns:

process

public void process(HttpServletRequest request,
                    HttpServletResponse response)
             throws ServletException,
                    IOException

This is a master method that is does the processing for both GET and POST.

Creation date: (1/10/01 8:38:52 AM) author Adam Rossi, PlatinumSolutions

Parameters:

request - javax.servlet.http.HttpServletRequest

response - javax.servlet.http.HttpServletResponse

Throws:

ServletException

IOException