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compressionFilters
Class CompressionFilter  

java.lang.Object
  compressionFilters.CompressionFilter

All Implemented Interfaces:

javax.servlet.Filter

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public class CompressionFilter

extends java.lang.Object

implements javax.servlet.Filter

Implementation of javax.servlet.Filter used to compress the ServletResponse if it is bigger than a threshold.

Version:

$Revision: 267129 $, $Date: 2004-03-18 11:40:35 -0500 (Thu, 18 Mar 2004) $

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Field Summary
protected  int	compressionThreshold           The threshold number to compress
private  javax.servlet.FilterConfig	config           The filter configuration object we are associated with.
private  int	debug           Debug level for this filter
private  int	minThreshold           Minimal reasonable threshold

 

Constructor Summary

CompressionFilter()

 

Method Summary
void	destroy()           Take this filter out of service.
void	doFilter(javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, javax.servlet.FilterChain chain)           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.
javax.servlet.FilterConfig	getFilterConfig()           Return filter config Required by Weblogic 6.1
void	init(javax.servlet.FilterConfig filterConfig)           Place this filter into service.
void	setFilterConfig(javax.servlet.FilterConfig filterConfig)           Set filter config This function is equivalent to init.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

config

private javax.servlet.FilterConfig config

The filter configuration object we are associated with. If this value is null, this filter instance is not currently configured.

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minThreshold

private int minThreshold

Minimal reasonable threshold

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compressionThreshold

protected int compressionThreshold

The threshold number to compress

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debug

private int debug

Debug level for this filter

Constructor Detail

CompressionFilter

public CompressionFilter()

Method Detail

init

public void init(javax.servlet.FilterConfig filterConfig)

Place this filter into service.

Specified by:

init in interface javax.servlet.Filter

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destroy

public void destroy()

Take this filter out of service.

Specified by:

destroy in interface javax.servlet.Filter

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doFilter

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

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 into this method allows the Filter to pass on the request and response to the next entity in the chain.

This method first examines the request to check whether the client support compression.
It simply just pass the request and response if there is no support for compression.
If the compression support is available, it creates a CompressionServletResponseWrapper object which compresses the content and modifies the header if the content length is big enough. It then invokes the next entity in the chain using the FilterChain object (chain.doFilter()),

Specified by:

doFilter in interface javax.servlet.Filter

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setFilterConfig

public void setFilterConfig(javax.servlet.FilterConfig filterConfig)

Set filter config This function is equivalent to init. Required by Weblogic 6.1

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getFilterConfig

public javax.servlet.FilterConfig getFilterConfig()

Return filter config Required by Weblogic 6.1

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