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org.roller.presentation.filters
Class CompressionFilter  

java.lang.Object
  org.roller.presentation.filters.CompressionFilter

All Implemented Interfaces:

javax.servlet.Filter

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public class CompressionFilter

extends java.lang.Object

implements javax.servlet.Filter

Filter that compresses output with gzip (assuming that browser supports gzip).

Taken from More Servlets and JavaServer Pages from Prentice Hall and Sun Microsystems Press, http://www.moreservlets.com/. © 2002 Marty Hall; may be freely used or adapted.

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Field Summary
private  javax.servlet.FilterConfig	config
private static org.apache.commons.logging.Log	mLogger

 

Constructor Summary

CompressionFilter()

 

Method Summary
void	destroy()           Called by the web container to indicate to a filter that it is being taken out of service.
void	doFilter(javax.servlet.ServletRequest request, javax.servlet.ServletResponse response, javax.servlet.FilterChain chain)           If browser does not support gzip, invoke resource normally.
protected  javax.servlet.FilterConfig	getFilterConfig()
void	init(javax.servlet.FilterConfig config)           Store the FilterConfig object in case subclasses want it.
private  boolean	isGzipSupported(javax.servlet.http.HttpServletRequest req)

 

Methods inherited from class java.lang.Object

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

 

Field Detail

mLogger

private static org.apache.commons.logging.Log mLogger

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config

private javax.servlet.FilterConfig config

Constructor Detail

CompressionFilter

public CompressionFilter()

Method Detail

doFilter

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

If browser does not support gzip, invoke resource normally. If browser does support gzip, set the Content-Encoding response header and invoke resource with a wrapped response that collects all the output. Extract the output and write it into a gzipped byte array. Finally, write that array to the client's output stream.

Specified by:

doFilter in interface javax.servlet.Filter

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init

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

Store the FilterConfig object in case subclasses want it.

Specified by:

init in interface javax.servlet.Filter

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getFilterConfig

protected javax.servlet.FilterConfig getFilterConfig()

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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 javax.servlet.Filter

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isGzipSupported

private boolean isGzipSupported(javax.servlet.http.HttpServletRequest req)

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Overview  Package   Class  Use  Deprecated  Index
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