🚀 go-pugleaf

 "Owen Green" <owen@norobots.unique.com> wrote:


> > Thanks for taking an interest. I would be grateful if you could figure
> > it out, it's been killing me for a while now.


> That was why in the first place
> the first string got pushed to the bottom. The, fairly inelegant, way I've
> got around  this is to test after the while loop for the marker string being
> null, signifying that it went all the way through the file without finding a
> place to insert; 


I tried your stuff and it didn't work, but I have finally come up with
a (very simple) solution...


The original problem really arose because I dug the algorithm out of a
book and it tacitly assumed that the line would be inserted somewhere
in an already existing file - it didn't take account of the fact that
I wanted to build one from scratch.

Thanks for your efforts on my behalf - and sorry for not replying
sooner, but I was (like others) having desperate problems with
timeouts on the Borland newsservers.


Paul...


      insertStringInFile("recordCode.idx", indexLineAt, myDataString);

    This calls

  public static void insertStringInFile(String inFilename,
                                        int lineno,
                                        String lineToBeInserted)
                                        throws IOException
  {
    // temp file

    File outFile = new File("$$$$$$$$.tmp");

     // input

    File inFile = new File(inFilename);

    FileInputStream fis  = new FileInputStream(inFile);

    BufferedReader in = new BufferedReader (new InputStreamReader(fis));

     // output
    FileOutputStream fos = new FileOutputStream(outFile);

    PrintWriter out = new PrintWriter(fos);

    String thisLine = "";

    System.out.println("\nThe line number for insertion is " + lineno);

    for(int i = 1; i < lineno; i++)
    {
      thisLine = in.readLine();
      out.println(thisLine);
    }
    out.println(lineToBeInserted);

    while ((thisLine = in.readLine()) != null)
    {
      out.println(thisLine);
    }

    out.flush();
    out.close();
    in.close();

    inFile.delete();
    outFile.renameTo(inFile);
  }