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Ehcache is an open source, standards-based cache used to boost performance,
offload the database and simplify scalability. Ehcache is robust, proven and full-featured and
this has made it the most widely-used Java-based cache.
//
// ========================================================================
// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.http.gzip;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.Set;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import org.eclipse.jetty.util.StringUtil;
/*------------------------------------------------------------ */
/**
*/
public abstract class CompressedResponseWrapper extends HttpServletResponseWrapper
{
public static final int DEFAULT_BUFFER_SIZE = 8192;
public static final int DEFAULT_MIN_COMPRESS_SIZE = 256;
private Set _mimeTypes;
private int _bufferSize=DEFAULT_BUFFER_SIZE;
private int _minCompressSize=DEFAULT_MIN_COMPRESS_SIZE;
protected HttpServletRequest _request;
private PrintWriter _writer;
private AbstractCompressedStream _compressedStream;
private String _etag;
private long _contentLength=-1;
private boolean _noCompression;
/* ------------------------------------------------------------ */
public CompressedResponseWrapper(HttpServletRequest request, HttpServletResponse response)
{
super(response);
_request = request;
}
/* ------------------------------------------------------------ */
public long getContentLength()
{
return _contentLength;
}
/* ------------------------------------------------------------ */
public int getBufferSize()
{
return _bufferSize;
}
/* ------------------------------------------------------------ */
public int getMinCompressSize()
{
return _minCompressSize;
}
/* ------------------------------------------------------------ */
public String getETag()
{
return _etag;
}
/* ------------------------------------------------------------ */
public HttpServletRequest getRequest()
{
return _request;
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setMimeTypes(java.util.Set)
*/
public void setMimeTypes(Set mimeTypes)
{
_mimeTypes = mimeTypes;
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setBufferSize(int)
*/
@Override
public void setBufferSize(int bufferSize)
{
_bufferSize = bufferSize;
if (_compressedStream!=null)
_compressedStream.setBufferSize(bufferSize);
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setMinCompressSize(int)
*/
public void setMinCompressSize(int minCompressSize)
{
_minCompressSize = minCompressSize;
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setContentType(java.lang.String)
*/
@Override
public void setContentType(String ct)
{
super.setContentType(ct);
if (!_noCompression)
{
if (ct!=null)
{
int colon=ct.indexOf(";");
if (colon>0)
ct=ct.substring(0,colon);
}
if ((_compressedStream==null || _compressedStream.getOutputStream()==null) &&
(_mimeTypes==null && ct!=null && ct.contains("gzip") ||
_mimeTypes!=null && (ct==null||!_mimeTypes.contains(StringUtil.asciiToLowerCase(ct)))))
{
noCompression();
}
}
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setStatus(int, java.lang.String)
*/
@Override
public void setStatus(int sc, String sm)
{
super.setStatus(sc,sm);
if (sc<200 || sc==204 || sc==205 || sc>=300)
noCompression();
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setStatus(int)
*/
@Override
public void setStatus(int sc)
{
super.setStatus(sc);
if (sc<200 || sc==204 || sc==205 || sc>=300)
noCompression();
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setContentLength(int)
*/
@Override
public void setContentLength(int length)
{
if (_noCompression)
super.setContentLength(length);
else
setContentLength((long)length);
}
/* ------------------------------------------------------------ */
protected void setContentLength(long length)
{
_contentLength=length;
if (_compressedStream!=null)
_compressedStream.setContentLength();
else if (_noCompression && _contentLength>=0)
{
HttpServletResponse response = (HttpServletResponse)getResponse();
if(_contentLength=0)
{
if (_contentLength < Integer.MAX_VALUE)
super.setContentLength((int)_contentLength);
else
super.setHeader("Content-Length",Long.toString(_contentLength));
}
if(_etag!=null)
super.setHeader("ETag",_etag);
}
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setHeader(java.lang.String, java.lang.String)
*/
@Override
public void setHeader(String name, String value)
{
if (_noCompression)
super.setHeader(name,value);
else if ("content-length".equalsIgnoreCase(name))
{
setContentLength(Long.parseLong(value));
}
else if ("content-type".equalsIgnoreCase(name))
{
setContentType(value);
}
else if ("content-encoding".equalsIgnoreCase(name))
{
super.setHeader(name,value);
if (!isCommitted())
{
noCompression();
}
}
else if ("etag".equalsIgnoreCase(name))
_etag=value;
else
super.setHeader(name,value);
}
/* ------------------------------------------------------------ */
@Override
public boolean containsHeader(String name)
{
if (!_noCompression && "etag".equalsIgnoreCase(name) && _etag!=null)
return true;
return super.containsHeader(name);
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#getOutputStream()
*/
@Override
public ServletOutputStream getOutputStream() throws IOException
{
if (_compressedStream==null)
{
if (getResponse().isCommitted() || _noCompression)
return getResponse().getOutputStream();
_compressedStream=newCompressedStream(_request,(HttpServletResponse)getResponse());
}
else if (_writer!=null)
throw new IllegalStateException("getWriter() called");
return _compressedStream;
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#getWriter()
*/
@Override
public PrintWriter getWriter() throws IOException
{
if (_writer==null)
{
if (_compressedStream!=null)
throw new IllegalStateException("getOutputStream() called");
if (getResponse().isCommitted() || _noCompression)
return getResponse().getWriter();
_compressedStream=newCompressedStream(_request,(HttpServletResponse)getResponse());
_writer=newWriter(_compressedStream,getCharacterEncoding());
}
return _writer;
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setIntHeader(java.lang.String, int)
*/
@Override
public void setIntHeader(String name, int value)
{
if ("content-length".equalsIgnoreCase(name))
{
_contentLength=value;
if (_compressedStream!=null)
_compressedStream.setContentLength();
}
else
super.setIntHeader(name,value);
}
/* ------------------------------------------------------------ */
/**
* Allows derived implementations to replace PrintWriter implementation.
*
* @param out the out
* @param encoding the encoding
* @return the prints the writer
* @throws UnsupportedEncodingException the unsupported encoding exception
*/
protected PrintWriter newWriter(OutputStream out,String encoding) throws UnsupportedEncodingException
{
return encoding==null?new PrintWriter(out):new PrintWriter(new OutputStreamWriter(out,encoding));
}
/* ------------------------------------------------------------ */
/**
*@return the underlying CompressedStream implementation
*/
protected abstract AbstractCompressedStream newCompressedStream(HttpServletRequest _request, HttpServletResponse response) throws IOException;
}