Package org.apache.catalina.filters

Class FilterBase

java.lang.Object

org.apache.catalina.filters.FilterBase

All Implemented Interfaces:

Filter

Direct Known Subclasses:

AddDefaultCharsetFilter, CsrfPreventionFilterBase, ExpiresFilter, FailedRequestFilter, HttpHeaderSecurityFilter, RemoteCIDRFilter, RequestFilter, SetCharacterEncodingFilter

public abstract class FilterBase
extends java.lang.Object
implements Filter

Base class for filters that provides generic initialisation and a simple no-op destruction.

Field Summary

Fields

Modifier and Type	Field	Description
protected static StringManager	sm

Constructor Summary

Constructors

Constructor	Description
FilterBase()

Method Summary

Modifier and Type	Method	Description
void	destroy()	Called by the web container to indicate to a filter that it is being taken out of service.
protected abstract Log	getLogger()
void	init(FilterConfig filterConfig)	Iterates over the configuration parameters and either logs a warning, or throws an exception for any parameter that does not have a matching setter in this filter.
protected boolean	isConfigProblemFatal()	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.

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.servlet.Filter

doFilter

Field Detail

sm

protected static final StringManager sm

Constructor Detail

FilterBase

public FilterBase()

Method Detail

getLogger

protected abstract Log getLogger()

init

public void init(FilterConfig filterConfig)
          throws ServletException

Iterates over the configuration parameters and either logs a warning, or throws an exception for any parameter that does not have a matching setter in this filter.

Specified by:

init in interface Filter

Parameters:

filterConfig - The configuration information associated with the filter instance being initialised

Throws:

ServletException - if isConfigProblemFatal() returns true and a configured parameter does not have a matching setter

destroy

public void destroy()

Description copied from interface: javax.servlet.Filter

Called by the web container to indicate to a filter that it is being taken out of service. This method is only called once all threads within the filter's doFilter method have exited or after a timeout period has passed. After the web container calls this method, it will not call the doFilter method again on this instance of the filter.

This method gives the filter an opportunity to clean up any resources that are being held (for example, memory, file handles, threads) and make sure that any persistent state is synchronized with the filter's current state in memory.

Specified by:

destroy in interface Filter

isConfigProblemFatal

protected boolean isConfigProblemFatal()

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.

Returns:

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