org.talika.tarsis.filters.duplicate
Class DuplicateRequestFilter

java.lang.Object
  org.talika.tarsis.filters.AbstractFilter
      org.talika.tarsis.filters.CommandFilter
          org.talika.tarsis.filters.duplicate.DuplicateRequestFilter

All Implemented Interfaces:

javax.servlet.Filter

public final class DuplicateRequestFilter
extends CommandFilter

DuplicateRequestFilter checks if command is dulicable and then checks if command request is duplicated.

Version:

$Revision: 269 $

Author:

Jose M. Palomar

Constructor Summary

DuplicateRequestFilter()

Method Summary

void	doFilter(javax.servlet.ServletRequest servletRequest, javax.servlet.ServletResponse servletResponse, javax.servlet.FilterChain filterChain) Checks if command is dulicable and then cheks if command request is duplicated.
protected java.lang.String	generateToken(javax.servlet.http.HttpServletRequest request) Generates a token for given request.
protected boolean	isTokenValid(javax.servlet.http.HttpServletRequest request) Checks if token is valid.
protected void	resetToken(javax.servlet.http.HttpServletRequest request) Resets token saved in client's HttpSession.
protected void	saveToken(javax.servlet.http.HttpServletRequest request) Saves tokan in client's HttpSession.

Methods inherited from class org.talika.tarsis.filters.CommandFilter

destroy, findCommand, getCommandFactory, init

Methods inherited from class org.talika.tarsis.filters.AbstractFilter

getContext, getFilterConfig, getLogger

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DuplicateRequestFilter

public DuplicateRequestFilter()

Method Detail

doFilter

public void doFilter(javax.servlet.ServletRequest servletRequest,
                     javax.servlet.ServletResponse servletResponse,
                     javax.servlet.FilterChain filterChain)
              throws java.io.IOException,
                     javax.servlet.ServletException

Checks if command is dulicable and then cheks if command request is duplicated.

Specified by:

doFilter in interface javax.servlet.Filter

Specified by:

doFilter in class AbstractFilter

Parameters:

servletRequest - ServletRequest the ServletRequest object that contains the client's request.

servletResponse - ServletResponse the ServletResponse object that contains the servlet's response.

filterChain - FilterChain invocation chain of filtered request.

Throws:

java.io.IOException - if an input or output exception occurs

javax.servlet.ServletException - if an exception has occurred that interferes with the filter's normal operation

See Also:

Filter.doFilter(ServletRequest, ServletResponse, FilterChain)

generateToken

protected java.lang.String generateToken(javax.servlet.http.HttpServletRequest request)

Generates a token for given request.

Borrowed from Action.java (Jakarta Struts).

Parameters:

request - HttpServletRequest the HttpServletRequest object that contains the client's request.

Returns:

String token generated from request.

isTokenValid

protected boolean isTokenValid(javax.servlet.http.HttpServletRequest request)

Checks if token is valid.

1. First tries to obtain saved token from HttpSession.
2. Then tries to obtain token from HttpServletRequest.
3. Last compare session token with request token.

Parameters:

request - HttpServletRequest the HttpServletRequest object that contains the client's request.

Returns:

boolean

resetToken

protected void resetToken(javax.servlet.http.HttpServletRequest request)

Resets token saved in client's HttpSession.

Parameters:

request - HttpServletRequest the HttpServletRequest object that contains the client's request.

saveToken

protected void saveToken(javax.servlet.http.HttpServletRequest request)

Saves tokan in client's HttpSession.

Parameters:

request - HttpServletRequest the HttpServletRequest object that contains the client's request.