title: copy .tar.gz files to folder
body: <p>I want to copy contents of a .tar.gz files to 2 folder , It has around 20 files and total unzipped size will be >20 GB.<br>
            I used Truezip for this .</p>
  
  <pre><code> TFile archive = new TFile(absoluteZipName); // archive with .tar.gz
      TFile[] archFiles = archive.listFiles(); // takes too much time 
      for (TFile t : archFiles) {
           String fileName = t.getName();
            if(fileName.endsWith(".dat"))
                t.cp(new File(destination1+ t.getName()));
            else if(fileName.endsWith(".txt")){
                 t.cp(new File(destination2+ t.getName()));
            }
      }
   It takes 3 times above tar xzf command (untar linux) . Have any way to optimize this code for fast copying, memory not an issue.  
  
      The following code allows fast copying Thanks npe for the good advice.
      (NB: I have no previledge to post the answe now that's why editing question itself)
  
  InputStream is = new FileInputStream(absoluteZipName);
              ArchiveInputStream input = new ArchiveStreamFactory()
                 .createArchiveInputStream(ArchiveStreamFactory.TAR, new GZIPInputStream(is));
  
              ArchiveEntry entry;
              while ((entry = input.getNextEntry()) != null) {
                  OutputStream outputFileStream=null;
                  if(entry.getName().endsWith(".dat")){
                   File outFile1= new File(destination1, entry.getName());
                       outputFileStream = new FileOutputStream(outFile1); 
                  }
                  else if(entry.getName().endsWith(".txt")){
                  File outFile2= new File(destination2, entry.getName());
                       outputFileStream = new FileOutputStream(outFile2);   
                  }
                  // use ArchiveEntry#getName() to do the conditional stuff...
                  IOUtils.copy(input, outputFileStream,10485760);
              }
  
  
      Is threading In file copy will reduce time..? In TZip didn't reduced as they already threading it. anyway I will try tomorrow and will let you Know.
  </code></pre>