com.jfw.web.filter
Class CompressionResponseStream

java.lang.Object
  java.io.OutputStream
      javax.servlet.ServletOutputStream
          com.jfw.web.filter.CompressionResponseStream

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable

public class CompressionResponseStream
extends javax.servlet.ServletOutputStream

Implementation of ServletOutputStream that works with the CompressionServletResponseWrapper implementation.

Field Summary

protected byte[]	buffer The buffer through which all of our output bytes are passed.
protected int	bufferCount The number of data bytes currently in the buffer.
protected java.lang.String	className
protected boolean	closed Has this stream been closed?
protected int	compressionThreshold The threshold number which decides to compress or not.
protected java.util.zip.GZIPOutputStream	gzipstream The underlying gzip output stream to which we should write data.
protected int	length The content length past which we will not write, or -1 if there is no defined content length.
protected static JFWLogger	logger
protected javax.servlet.ServletOutputStream	output The underlying servket output stream to which we should write data.
protected javax.servlet.http.HttpServletResponse	response The response with which this servlet output stream is associated.

Constructor Summary

CompressionResponseStream(javax.servlet.http.HttpServletResponse response)
Construct a servlet output stream associated with the specified Response.

Method Summary

void	close() Close this output stream, causing any buffered data to be flushed and any further output data to throw an IOException.
boolean	closed() Has this response stream been closed?
void	flush() Flush any buffered data for this output stream, which also causes the response to be committed.
void	flushToGZip()
protected void	setBuffer(int threshold) Set the compressionThreshold number and create buffer for this size
void	write(byte[] b) Write b.length bytes from the specified byte array to our output stream.
void	write(byte[] b, int off, int len) Write len bytes from the specified byte array, starting at the specified offset, to our output stream.
void	write(int b) Write the specified byte to our output stream.
void	writeToGZip(byte[] b, int off, int len)

Methods inherited from class javax.servlet.ServletOutputStream

print, print, print, print, print, print, print, println, println, println, println, println, println, println, println

Methods inherited from class java.lang.Object

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

Field Detail

compressionThreshold

protected int compressionThreshold

The threshold number which decides to compress or not. Users can configure in web.xml to set it to fit their needs.

buffer

protected byte[] buffer

The buffer through which all of our output bytes are passed.

bufferCount

protected int bufferCount

The number of data bytes currently in the buffer.

gzipstream

protected java.util.zip.GZIPOutputStream gzipstream

The underlying gzip output stream to which we should write data.

closed

protected boolean closed

Has this stream been closed?

length

protected int length

The content length past which we will not write, or -1 if there is no defined content length.

response

protected javax.servlet.http.HttpServletResponse response

The response with which this servlet output stream is associated.

output

protected javax.servlet.ServletOutputStream output

The underlying servket output stream to which we should write data.

className

protected final java.lang.String className

logger

protected static final JFWLogger logger

Constructor Detail

CompressionResponseStream

public CompressionResponseStream(javax.servlet.http.HttpServletResponse response)
                          throws java.io.IOException

Construct a servlet output stream associated with the specified Response.

Parameters:

response - The associated response

Throws:

java.io.IOException

Method Detail

setBuffer

protected void setBuffer(int threshold)

Set the compressionThreshold number and create buffer for this size

close

public void close()
           throws java.io.IOException

Close this output stream, causing any buffered data to be flushed and any further output data to throw an IOException.

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.OutputStream

Throws:

java.io.IOException

flush

public void flush()
           throws java.io.IOException

Flush any buffered data for this output stream, which also causes the response to be committed.

Specified by:

flush in interface java.io.Flushable

Overrides:

flush in class java.io.OutputStream

Throws:

java.io.IOException

flushToGZip

public void flushToGZip()
                 throws java.io.IOException

Throws:

java.io.IOException

write

public void write(int b)
           throws java.io.IOException

Write the specified byte to our output stream.

Specified by:

write in class java.io.OutputStream

Parameters:

b - The byte to be written

Throws:

java.io.IOException - if an input/output error occurs

write

public void write(byte[] b)
           throws java.io.IOException

Write b.length bytes from the specified byte array to our output stream.

Overrides:

write in class java.io.OutputStream

Parameters:

b - The byte array to be written

Throws:

java.io.IOException - if an input/output error occurs

write

public void write(byte[] b,
                  int off,
                  int len)
           throws java.io.IOException

Write len bytes from the specified byte array, starting at the specified offset, to our output stream.

Overrides:

write in class java.io.OutputStream

Parameters:

b - The byte array containing the bytes to be written

off - Zero-relative starting offset of the bytes to be written

len - The number of bytes to be written

Throws:

java.io.IOException - if an input/output error occurs

writeToGZip

public void writeToGZip(byte[] b,
                        int off,
                        int len)
                 throws java.io.IOException

Throws:

java.io.IOException

closed

public boolean closed()

Has this response stream been closed?