org.springframework.web.filter

Class CompositeFilter

java.lang.Object

org.springframework.web.filter.CompositeFilter

public class CompositeFilter
extends java.lang.Object

A generic composite servlet Filter that just delegates its behaviour to a chain (list) of user supplied filters, achieving the functionality of a FilterChain, but conveniently using only Filter instances. This is useful for filters that require dependency injection, and can therefore be set up in a Spring application context. Typically this composite would be used in conjunction with DelegatingFilterProxy, so that it can be declared in Spring but applied to a servlet context.

Since:

3.1

Author:

Dave Syer

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	CompositeFilter.VirtualFilterChain

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.List<? extends Filter>	filters

Constructor Summary

Constructors

Constructor and Description
CompositeFilter()

Method Summary

Methods

Modifier and Type	Method and Description
void	destroy() Clean up all the filters supplied, calling each one's destroy method in turn, but in reverse order.
void	doFilter(ServletRequest request, ServletResponse response, FilterChain chain) Forms a temporary chain from the list of delegate filters supplied (setFilters(List)) and executes them in order.
void	init(FilterConfig config) Initialize all the filters, calling each one's init method in turn in the order supplied.
void	setFilters(java.util.List<? extends Filter> filters)

Methods inherited from class java.lang.Object

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

Field Detail

filters

private java.util.List<? extends Filter> filters

Constructor Detail

CompositeFilter

public CompositeFilter()

Method Detail

setFilters

public void setFilters(java.util.List<? extends Filter> filters)

destroy

public void destroy()

Clean up all the filters supplied, calling each one's destroy method in turn, but in reverse order.

See Also:

Filter#init(FilterConfig)

init

public void init(FilterConfig config)
          throws ServletException

Initialize all the filters, calling each one's init method in turn in the order supplied.

Throws:

ServletException

See Also:

Filter#init(FilterConfig)

doFilter

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

Forms a temporary chain from the list of delegate filters supplied (setFilters(List)) and executes them in order. Each filter delegates to the next one in the list, achieving the normal behaviour of a FilterChain, despite the fact that this is a Filter.

Throws:

java.io.IOException

ServletException

See Also:

Filter#doFilter(ServletRequest, ServletResponse, FilterChain)