com.bea.p13n.servlets
Class NullFilter

java.lang.Object
  com.bea.p13n.servlets.NullFilter

All Implemented Interfaces

javax.servlet.Filter

public class NullFilter
extends Object
implements javax.servlet.Filter

This filter does nothing. The only reason you might need such a thing is to override a filter that has been deployed in a Library Module. Due to the way descriptor merging works for web.xml, you can not "turn off" a filter which is deployed in a library's web.xml. There is not anything available in your web app's web.xml to turn such a filter off. Therefore, the only thing you can do is override the filter with one that does nothing (that is why this filter exists).

For example, maybe a library module contains a filter such as:

    <filter>
      <filter-name>SomeFilter</filter-name>
      <filter-class>org.foo.TheFilter</filter-class>
    </filter>
 

You can override this in your application's web.xml using the same filter-name, like this:

    <filter>
      <filter-name>SomeFilter</filter-name>
      <filter-class>com.bea.p13n.servlets.NullFilter</filter-class>
    </filter>
 

Constructor Summary

NullFilter()

Method Summary

void	destroy() does nothing
void	doFilter(javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, javax.servlet.FilterChain chain) Simply calls chain.doFilter(request,response).
void	init(javax.servlet.FilterConfig config) does nothing

Methods inherited from class java.lang.Object

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

Constructor Detail

NullFilter

public NullFilter()

Method Detail

doFilter

public void doFilter(javax.servlet.ServletRequest request,
                     javax.servlet.ServletResponse response,
                     javax.servlet.FilterChain chain)
              throws IOException,
                     javax.servlet.ServletException

Simply calls chain.doFilter(request,response).

Specified by:

doFilter in interface javax.servlet.Filter

Throws

IOException

javax.servlet.ServletException

init

public void init(javax.servlet.FilterConfig config)
          throws javax.servlet.ServletException

does nothing

Specified by:

init in interface javax.servlet.Filter

Throws

javax.servlet.ServletException

destroy

public void destroy()

does nothing

Specified by:

destroy in interface javax.servlet.Filter