Examples of java.util.zip.GZIPOutputStream

java.util.zip.GZIPOutputStream
This class implements a stream filter for writing compressed data in the GZIP file format. @version 1.23, 11/17/05 @author David Connelly

         return buffer;
      }
      ByteArrayOutputStream baos = new ByteArrayOutputStream();
      byte[] ret = null;
      try {
          GZIPOutputStream zippedStream = new GZIPOutputStream(baos);
          zippedStream.write(buffer);
          zippedStream.finish();
          ret = baos.toByteArray();
          if (ret.length >= uncompressedLength) {
             log.fine("The compressed size is bigger than the original. Will not compress since it does not make sense");
             return buffer;
          }

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    }


    private void setupCompressionOutputStream(StreamMessageContext ctx) { 
        
        try { 
            ctx.setOutputStream(new GZIPOutputStream(ctx.getOutputStream()));
        } catch (IOException ex) {
            throw new ProtocolException(ex);
        }
    }

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    // String url = "http://motherlode.ucar.edu:8080/thredds/dodsC/fmrc/NCEP/NDFD/CONUS_5km/NDFD-CONUS_5km_best.ncd";


    StationObsDataset ncd = (StationObsDataset) TypedDatasetFactory.open(FeatureType.STATION, url, null, new StringBuilder());
    StationObsDatasetInfo info = new StationObsDatasetInfo(ncd, null);
    FileOutputStream fos2 = new FileOutputStream("C:/TEMP/stationCollection.xml");
    GZIPOutputStream zout =  new GZIPOutputStream( fos2);
    //info.writeXML(fos2);
    //fos2.close();


    info.writeStationObsDatasetXML(System.out);
    info.writeStationCollectionXML(zout);


    zout.close();
    File f = new File("C:/TEMP/stationCollection.xml");
    System.out.println(" size="+f.length());
  }

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  void read2xml() throws IOException, XMLStreamException {
    XMLOutputFactory fac = XMLOutputFactory.newInstance();


    String fileout = "D:/bufr/out/test5.xml.gzip";
    FileOutputStream fos = new FileOutputStream(fileout);
    GZIPOutputStream zos = new GZIPOutputStream(fos);


    //staxWriter = fac.createXMLStreamWriter(System.out, "UTF-8");
    //staxWriter = fac.createXMLStreamWriter(fos, "UTF-8");
    staxWriter = fac.createXMLStreamWriter(zos, "UTF-8");


    staxWriter.writeStartDocument("UTF-8", "1.0");
    staxWriter.writeCharacters("\n");
    staxWriter.writeStartElement("bufrMessages");


    String filename = "D:/bufr/mlodeSorted/IUSUV1KWBC.bufr";
    //String filename = "D:/bufr/out/IUACRJTD-1.bufr";
    //String filename = "D:/bufr/mlodeSorted/ISXAB40KWNO.bufr";
    test(filename, new MClosure() {
      public void run(String filename) throws IOException {
        scan(filename);
      }
    });


    staxWriter.writeCharacters("\n");
    staxWriter.writeEndDocument();
    staxWriter.flush();
    zos.close();


    out.flush();
  }

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      // Write header
      out.write(MAGIC_NUMBER);
      out.write(BMSF_VERSION);


      // The rest of the data is GZIP-compressed
      DataOutputStream dataOut = new DataOutputStream(new GZIPOutputStream(out));
      out = dataOut;


      writeNamespaces(dataOut);


      writeStatements(dataOut);

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     * @return the compressed byte array
     * @throws IOException if an excption occurs
     */
  public static byte[] compress(byte[] data) throws IOException {
      ByteArrayOutputStream bos = new ByteArrayOutputStream(data.length);
      GZIPOutputStream out = new GZIPOutputStream(bos);
      
        out.write(data);
        out.close();
        return bos.toByteArray();
    }

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    FileInputStream fin = new FileInputStream(filenameIn);
    InputStream in = new BufferedInputStream(fin, 1000);


    FileOutputStream fout = new FileOutputStream(filenameOut);
    OutputStream out = (inflate) ? new DeflaterOutputStream(fout) : new GZIPOutputStream(fout);
    out = new BufferedOutputStream(out, 1000);


    long start = System.currentTimeMillis();
    IO.copyB( in, out, 10000);
    out.flush();

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  }


  // test GZIPOutputStream - write 1M random floats
  static public void gzipRandom(String filenameOut, boolean buffer) throws IOException {
    FileOutputStream fout = new FileOutputStream(filenameOut);
    OutputStream out = new GZIPOutputStream(fout);
    if (buffer)
      out = new BufferedOutputStream(out, 1000); // 3X performance by having this !!
    DataOutputStream dout = new DataOutputStream(out);


    Random r = new Random();

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    } 


    private void setupCompressionOutputStream(StreamMessageContext ctx) { 


        try { 
            GZIPOutputStream zipOut = new GZIPOutputStream(ctx.getOutputStream());
            ctx.setOutputStream(zipOut); 
        } catch (IOException ex) { 
            throw new ProtocolException(ex);
        }
    }

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    }


    protected OutputStream doGetOutputStream(boolean bAppend) throws Exception
    {
        OutputStream os = getContainer().getContent().getOutputStream(false);
        return new GZIPOutputStream(os);
    }

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