Start line:  
End line:  

Snippet Preview

Snippet HTML Code

Stack Overflow Questions
  /*
  * JBoss, Home of Professional Open Source
  * Copyright 2005, JBoss Inc., and individual contributors as indicated
  * by the @authors tag. See the copyright.txt in the distribution for a
  * full listing of individual contributors.
  *
  * This is free software; you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as
  * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
 
 package org.jboss.remoting.marshal.compress;
 
 
CompressingMarshaller and CompressingUnMarshaller are a general purpose compressing marshaller / decompressing unmarshaller pair based on Java's GZIP facilities.

CompressingMarshaller is subclassed from SerializableMarshaller, and by default it uses super.write() to marshall an object, which is then compressed. Optionally, it can wrap any other marshaller and use that instead of SerializableMarshaller to marshall an object before it is compressed. For example,

new CompressingMarshaller(new HTTPMarshaller())

will create a marshaller that compresses the output of an HTTPMarshaller.

Author(s):
Ron Sigal
Version:
$Revision: 5337 $

Copyright (c) 2005

 
 
 {
    public final static String DATATYPE = "compressible";
 
    private Marshaller wrappedMarshaller;
    private static final long serialVersionUID = 8731343309128430753L;

   
Create a new CompressingMarshaller.
 
    public CompressingMarshaller()
    {
    }


   
Create a new CompressingMarshaller.

Parameters:
marshaller A Marshaller which is used to turn objects into byte streams.
 
    public CompressingMarshaller(Marshaller marshaller)
    {
        = marshaller;
    }
 
    public OutputStream getMarshallingStream(OutputStream outputStreamthrows IOException
    {
       GZIPOutputStream gzos = new SelfCleaningGZipOutputStream(outputStream);
       return bos;
    }
   

   
Writes compressed, marshalled form of dataObject to output.

Parameters:
dataObject arbitrary object to be marshalled
output OutputStream to which output is to be marshalled
version wire format version
 
    public void write(Object dataObjectOutputStream outputint versionthrows IOException
    {
      SelfCleaningGZipOutputStream gzos = null;
      DecomposableBufferedOutputStream bos = null;
      if (output instanceof DecomposableBufferedOutputStream)
      {
         bos = (DecomposableBufferedOutputStreamoutput;
         gzos = (SelfCleaningGZipOutputStreambos.getWrappedStream();
         gzos.refreshDeflater();
      }
      else
      {
         gzos = new SelfCleaningGZipOutputStream(output);
         bos = new DecomposableBufferedOutputStream(gzos);
      }
      ObjectOutputStream oos = SerializationStreamFactory.getManagerInstance(getSerializationType()).createOutput(bos);
      if( != null)
      {
         if ( instanceof VersionedMarshaller)
            ((VersionedMarshaller).write(dataObjectoosversion);
         else
            .write(dataObjectoos);
      }
      else
      {
         super.write(dataObjectoosversion);
      }
      oos.flush();
      bos.flush();
      gzos.finish();
      gzos.flush();
   }

   
Returns a CompressingMarshaller.

Returns:
a CompressingMarshaller.
Throws:
java.lang.CloneNotSupportedException In practice no exceptions are thrown
   {
      return new CompressingMarshaller();
   }
   
   
   

Author(s):
Doychin Bondzhev
   static class SelfCleaningGZipOutputStream extends GZIPOutputStream
   {
      boolean used;
      
      public SelfCleaningGZipOutputStream(OutputStream outthrows IOException
      {
         super(out);
      }
      
      void refreshDeflater()
      {
         if ()
         {
             = new Deflater(.true);
            .reset();
         }
         else
         {
             = true;
         }
      }

      
Writes remaining compressed data to the output stream and closes the underlying stream.

Throws:
java.io.IOException if an I/O error has occurred
      public void finish() throws IOException
      {
         super.finish();
         .end(); // This will release all resources used by zlib native code
      }
   }
   
   {
      {
         super(outsize);
      }
      {
         super(out);
      }
      
      {
         return ;
      }
   }
New to GrepCode? Check out our FAQ X