org.apache.catalina.filters
Class FailedRequestFilter

java.lang.Object
  org.apache.catalina.filters.FilterBase
      org.apache.catalina.filters.FailedRequestFilter

All Implemented Interfaces:

javax.servlet.Filter, CometFilter

public class FailedRequestFilter
extends FilterBase
implements CometFilter

Filter that will reject requests if there was a failure during parameter parsing. This filter can be used to ensure that none parameter values submitted by client are lost.

Note that it has side effect that it triggers parameter parsing and thus consumes the body for POST requests. Parameter parsing does check content type of the request, so there should not be problems with addresses that use request.getInputStream() and request.getReader(), if requests parsed by them do not use standard value for content mime-type.

FailedRequestFilter

public FailedRequestFilter()

getLogger

protected Log getLogger()

Specified by:

getLogger in class FilterBase

doFilter

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

Description copied from interface: javax.servlet.Filter

The doFilter method of the Filter is called by the container each time a request/response pair is passed through the chain due to a client request for a resource at the end of the chain. The FilterChain passed in to this method allows the Filter to pass on the request and response to the next entity in the chain.

A typical implementation of this method would follow the following pattern:-
1. Examine the request
2. Optionally wrap the request object with a custom implementation to filter content or headers for input filtering
3. Optionally wrap the response object with a custom implementation to filter content or headers for output filtering
4. a) Either invoke the next entity in the chain using the FilterChain object (chain.doFilter()),
4. b) or not pass on the request/response pair to the next entity in the filter chain to block the request processing
5. Directly set headers on the response after invocation of the next entity in the filter chain.

Specified by:

doFilter in interface javax.servlet.Filter

Throws:

java.io.IOException

javax.servlet.ServletException

doFilterEvent

public void doFilterEvent(CometEvent event,
                          CometFilterChain chain)
                   throws java.io.IOException,
                          javax.servlet.ServletException

Description copied from interface: CometFilter

The doFilterEvent method of the CometFilter is called by the container each time a request/response pair is passed through the chain due to a client event for a resource at the end of the chain. The CometFilterChain passed in to this method allows the Filter to pass on the event to the next entity in the chain.

A typical implementation of this method would follow the following pattern:-
1. Examine the request
2. Optionally wrap the request object contained in the event with a custom implementation to filter content or headers for input filtering and pass a CometEvent instance containing the wrapped request to the next filter
3. Optionally wrap the response object contained in the event with a custom implementation to filter content or headers for output filtering and pass a CometEvent instance containing the wrapped request to the next filter
4. a) Either invoke the next entity in the chain using the CometFilterChain object (chain.doFilterEvent()),
4. b) or not pass on the request/response pair to the next entity in the filter chain to block the event processing
5. Directly set fields on the response after invocation of the next entity in the filter chain.

Specified by:

doFilterEvent in interface CometFilter

Parameters:

event - the event that is being processed. Another event may be passed along the chain.

Throws:

java.io.IOException

javax.servlet.ServletException

isConfigProblemFatal

protected boolean isConfigProblemFatal()

Description copied from class: FilterBase

Determines if an exception when calling a setter or an unknown configuration attribute triggers the failure of the this filter which in turn will prevent the web application from starting.

Overrides:

isConfigProblemFatal in class FilterBase

Returns:

true if a problem should trigger the failure of this filter, else false