FileMonitor issue for date time stamp change.

Question

Hi I have an app that runs with a minor issue and I am looking for some insight for a workaround or code change.
I have a File Monitor that checks a specific directory every second.
Users send a batch run to this directory throughout the day. There are two types of files, .ZIPs and .DONEs.
So for each .ZIP a .DONE is sent to notify the app it can begin to process the file.
Here is what I receive
/elements/process/File1.ZIP     Oct 15 08:19
/elements/process/File1.DONE     Oct 15 08:19
The problem I am encountering is sometimes the .DONE and. ZIP are sent and the date time stamp of both files are the same so when the monitor reads the directory it looks like there is no change so both files sit in the directory and do not process. To make this work, I usually go in and touch a file to change the date time stamp.
This is a java app that runs on an AIX box.
Here is my code, is there anything any once can suggest to help me out. Thanks in advance.
   * Subclass of FileMonitor, Handles the timer event
   * @param none
  private class FileMonitorNotifier extends TimerTask
    public void run()
      // Loop over the registered files and see which have changed.
      // Uses the Modifed DateTimeStamp to determine if there was a change.
      // Use a copy of the list in case listener wants to alter the
      // list within its fileChanged method.
        try
            Collection files = new ArrayList (hmFiles.keySet());
            for (Iterator i = files.iterator(); i.hasNext(); )
                File file = (File) i.next();
                long lastModifiedTime = ((Long) hmFiles.get (file)).longValue();
                long newModifiedTime  = file.exists() ? file.lastModified() : -1;
                //      Check if file has changed
                if (newModifiedTime != lastModifiedTime)
                    //      Register new modified time
                    hmFiles.put(file, new Long (newModifiedTime));
                    // Notify listeners
                    for (Iterator j = colListeners.iterator(); j.hasNext(); )
                        WeakReference reference = (WeakReference) j.next();
                        FileListener listener = (FileListener) reference.get();
                        // Remove from list if the back-end object has been GC'd
                        if (listener == null)
                            j.remove();
                        else
                            listener.fileChanged (file);
        catch(Exception ex)
             m_odLaunch.logError(OdIntegrationConstants.ERROR_LEVEL_MIDLEVEL, ex);
     }

Answer 1

Yes, I guess you are right, I don't care what time each file came, as long as I have both I can being to unzip and process and delete the .DONE.
The code itself was based on if a filechanged then do work.... I could just take this out. Thanks!
* This is the main entry point when there is a change to the modified date/time
*  of the monitor directory
* @param file directory we are monitoring
     public void fileChanged (File file)
          StringBuffer sbMessage;
          try
               sbMessage = new StringBuffer();
               //Make sure this is a Directory
               if(file.isDirectory())
                    //Return list of files with extension we are looking for
                    File[] arFiles = file.listFiles((FilenameFilter)new FileSuffixMonitor(m_odLauncher));
                    for(int i=0;i < arFiles.length;i++)
                         sbMessage.append("Found file association to move-" );
                         sbMessage.append(arFiles.toString());
                         m_odLauncher.logInstance(sbMessage.toString());
                         processMoveFile(arFiles[i]);
          catch(Exception ex)
          sbMessage = null;