/**
   * Sync the file
   *
   * @return true if needed to sync
   * @throws IOException problem synching the file
   */
  public boolean sync() throws IOException {
    // printStack("***************************** sync ************************", 100);
    // System.out.printf("check sync on %s (%s) %n", raf.getLocation(),
    // Calendar.getInstance().getTime());

    if (gemreader.getInitFileSize() < raf.length()) {
      long start = System.currentTimeMillis();
      Trace.msg(
          "GEMPAKStationIOSP.sync: file "
              + raf.getLocation()
              + " is bigger: "
              + raf.length()
              + " > "
              + gemreader.getInitFileSize());
      Trace.call1("GEMPAKStationIOSP.sync: reader.init");
      gemreader.init(raf, true);
      Trace.call2("GEMPAKStationIOSP.sync: reader.init");
      Trace.call1("GEMPAKStationIOSP.sync: buildNCFile");
      // reconstruct the ncfile objects
      buildNCFile();
      Trace.call2("GEMPAKSIOSP.sync: buildNCFile");
      // System.out.printf("sync on %s took %d msecs%n", raf.getLocation(),
      // (System.currentTimeMillis()-start));
      return true;
    }
    return false;
  }
 /**
  * Build the netCDF file
  *
  * @throws IOException problem reading the file
  */
 protected void buildNCFile() throws IOException {
   Trace.call1("GEMPAKSIOSP: buildNCFile");
   ncfile.empty();
   fillNCFile();
   addGlobalAttributes();
   ncfile.finish();
   Trace.call2("GEMPAKSIOSP: buildNCFile");
   // System.out.println(ncfile);
 }
  /**
   * Open the service provider for reading.
   *
   * @param raf file to read from
   * @param ncfile netCDF file we are writing to (memory)
   * @param cancelTask task for cancelling
   * @throws IOException problem reading file
   */
  public void open(RandomAccessFile raf, NetcdfFile ncfile, CancelTask cancelTask)
      throws IOException {

    // System.out.printf("GempakSurfaceIOSP open %s (%s) %n", raf.getLocation(),
    // Calendar.getInstance().getTime());

    this.raf = raf;
    this.ncfile = ncfile;
    long start = System.currentTimeMillis();
    if (gemreader == null) {
      gemreader = makeStationReader();
    }
    Trace.call1("GEMPAKStationIOSP.open: initTables");
    initTables();
    Trace.call2("GEMPAKStationIOSP.open: initTables");
    Trace.call1("GEMPAKStationIOSP.open: reader.init");
    gemreader.init(raf, true);
    Trace.call2("GEMPAKStationIOSP.open: reader.init");
    buildNCFile();
  }
 /**
  * Is this a valid file?
  *
  * @param raf RandomAccessFile to check
  * @return true if a valid Gempak grid file
  * @throws IOException problem reading file
  */
 public boolean isValidFile(RandomAccessFile raf) throws IOException {
   try {
     gemreader = makeStationReader();
     Trace.call1("GEMPAKSIOSP.isValidFile: reader.init");
     gemreader.init(raf, false);
     Trace.call2("GEMPAKSIOSP.isValidFile: reader.init");
   } catch (Exception ioe) {
     return false;
   }
   return true;
 }