Either Overwrite or Rename file

[Shaitan00]

Coding Style: NetBeans IDE 4.0 Beta2 (Java)

My goal is to edit a Text File (and I am having a real hard time).
So far the only solution I have found is to OPEN the current Text File (FileReader to Chatter.txt) and create a new Text File (FileWriter to oChatter.txt), .readline all the lines that do not need changing (Catch the ones I do and edit them) and write
each line into the new text file (as shown in the code below)

[CODE]
String incomming = "";

File fSourceStore = new File("Chatter.txt");
File fDestStore = new File("oChatter.txt");
FileReader frStore = new FileReader(fSourceStore);
FileWriter fwStore = new FileWriter(fDestStore);
BufferedReader brStore = new BufferedReader(frStore);
BufferedWriter bwStore = new BufferedWriter(fwStore);

boolean bSearch = true;
while (bSearch == true)
{
incomming = brStore.readLine();
if (incomming == null)
{
// End of File
bwStore.close();
brStore.close();
frStore.close();
fwStore.close();
bSearch = false;
}
else if (DETERMINE IF THIS LINE NEEDS TO BE EDITED)
{
// EDIT THE LINE //
bwStore.write(newLine);
bwStore.newLine();
}
else
{
// Keep information in file
bwStore.write(incomming);
bwStore.newLine();
}
}
[CODE]

Now this works good except that I can't seem to find a way (afterwards) to DELETE the old Chatter.txt and rename the new oChatter.txt -> Chatter.txt
Also, isn't there a way to OVERWRITE or MODIFY the file and not have to create/rename a TEMP file (oChatter.txt) every time I want to make a slight change to the file?
There has to be like a ReaderWriter or some .Overwrite or something?

Any kind of help would be greatly appreciated.
Thanks,

[sjalle]

import java.io.*;
import java.util.*;

public class FileUpdater {

  private String filePath=null;
  public final static String BACKUP_PATH="c:\\tmp\\bcup.txt";
  //
  public FileUpdater(String filePath) {
    this.filePath=filePath;
  }
  public void updateFile () throws IOException {
    ArrayList recordList=new ArrayList();

    // get file buffer as an arraylist of records
    BufferedReader br=new BufferedReader(new FileReader(filePath));
    String line=null;
    while ((line=br.readLine())!=null) {
      recordList.add(line);
    }
    br.close();

    // scan file buffer's records and perform updates where required.
    // if no edit required then leave as is
    int edCount=0;
    for (int i=0; i<recordList.size(); i++) {
      String inLine=(String)recordList.get(i);

      /**
       * check edit conditions and return new line if edited
       */
      String newLine=checkForEdit(inLine);

      if (newLine!=null) {
        recordList.set(i,newLine); // replace line
        edCount++;
      }
    }
    System.out.println("\n\nIn file "+filePath+" "+
                       edCount+" lines of "+recordList.size()+" lines have been edited");
    /**
     * file buffer is prepared, backup the old version,  overwrite and exit
     */
    // backup
    br = new BufferedReader(new FileReader(filePath));
    BufferedWriter bw = new BufferedWriter(new FileWriter(BACKUP_PATH));
    while ( (line = br.readLine()) != null) {
      bw.write(line);
      bw.newLine();
    }
    br.close();
    bw.close();
    System.out.println("Backed up old version of " + filePath + " to " +
                       BACKUP_PATH);
    // store
    bw = new BufferedWriter(new FileWriter(filePath));
    for (int i = 0; i < recordList.size(); i++) {
      line = (String) recordList.get(i);
      bw.write(line);
      bw.newLine();
    }
    bw.close();
    System.out.println("Saved updates to: " + filePath + " records: " +
                       recordList.size());

  }
  /**
   * Stupid example but made just to have a runthrough
   * @param inLine
   * @return
   */
  private String checkForEdit (String inLine) {
    int pos=inLine.indexOf("text");
    if (pos > 0) {
      return inLine+" [text found at pos: "+pos+"]";
    } else {
      return null;
    }

  }
  
  /**
   * ************************ MAIN *********************
   * @param args
   */
  public static void main(String[] args) {
    FileUpdater fu = new FileUpdater("c:\\tmp\\test.txt");
    try {
      fu.updateFile();
      System.out.println("FileUpdater finished");
    }
    catch (IOException ex) {
      System.out.println("FileUpdater failed");
      ex.printStackTrace();
    }
  }

}