Java Code Examples for ucar.nc2.dataset.NetcdfDataset#openFile()

/**
 * Main program.
 * <p>
 * <strong>ucar.nc2.NCdumpW filename [-cdl | -ncml] [-c | -vall] [-v varName1;varName2;..] [-v varName(0:1,:,12)]
 * </strong>
 * <p>
 * where:
 * <ul>
 * <li>filename : path of any CDM readable file
 * <li>cdl or ncml: output format is CDL or NcML
 * <li>-vall : dump all variable data
 * <li>-c : dump coordinate variable data
 * <li>-v varName1;varName2; : dump specified variable(s)
 * <li>-v varName(0:1,:,12) : dump specified variable section
 * </ul>
 * Default is to dump the header info only.
 *
 * @param args arguments
 */
public static void main(String[] args) {
  if (args.length == 0) {
    System.out.println(usage);
    return;
  }

  // pull out the filename from the command
  String filename = args[0];
  try (Writer writer = new BufferedWriter(new OutputStreamWriter(System.out, StandardCharsets.UTF_8));
      NetcdfFile nc = NetcdfDataset.openFile(filename, null)) {
    // the rest of the command
    StringBuilder command = new StringBuilder();
    for (int i = 1; i < args.length; i++) {
      command.append(args[i]);
      command.append(" ");
    }
    print(nc, command.toString(), writer, null);
  } catch (IOException ioe) {
    ioe.printStackTrace();
  }
}
 

static void testRead(String filename, Stat stat, boolean readData) throws IOException, InvalidRangeException {
  long bytes = 0;
  long start = System.nanoTime();
  if (show)
    System.out.printf("%n------Reading filename %s (%s)%n", filename, stat.getName());

  try (NetcdfFile ncfile = NetcdfDataset.openFile(filename, null)) {
    if (readData)
      bytes = readAllData(ncfile);
    long end = System.nanoTime();
    double took = ((double) (end - start)) / 1000 / 1000 / 1000; // secs
    double rate = 0;
    ncfile.close();
    if (stat != null && bytes > 0) {
      rate = bytes / took / 1000 / 1000;
      stat.sample(rate); // Mb/sec
    }
    if (show)
      System.out.printf(" bytes = %d took =%f secs rate=%f MB/sec%n", bytes, took, rate);
  }
}
 

public static void timeFileWriter(String location, String fileOut) throws IOException {
  long startTime = System.currentTimeMillis();

  try (NetcdfFile ds = NetcdfDataset.openFile(location, null)) {
    FileWriter2 writer = new FileWriter2(ds, fileOut, NetcdfFileWriter.Version.netcdf3, null);
    NetcdfFile ncfileOut = writer.write();
    ncfileOut.close();
  }

  // NetcdfFile ncfileOut = ucar.nc2.FileWriter.writeToFile(ds, fileOut, false, 0);
  long diff = System.currentTimeMillis() - startTime; // msecs

  File result = new File(fileOut);
  double size = .001 * result.length(); // km
  double rate = size / diff; // Mb/sec
  System.out.println("FileWriter.writeToFile " + location + "  took " + diff + " msecs rate= " + rate + " Mb/sec");
}
 

public void run(Object o) throws IOException {
  try {
    boolean useBuilders = ToolsUI.getToolsUI().getUseBuilders();
    if (useCoords) {
      ncfile = useBuilders ? NetcdfDatasets.openDataset(filename, true, null)
          : NetcdfDataset.openDataset(filename, true, null);
    } else {
      DatasetUrl durl = DatasetUrl.findDatasetUrl(filename);
      ncfile = useBuilders ? NetcdfDatasets.openFile(durl, -1, null, null) : NetcdfDataset.openFile(filename, null);
    }

    StringWriter sw = new StringWriter(50000);
    Ncdump.ncdump(ncfile, command, sw, task);
    result = sw.toString();
  } finally {
    try {
      if (ncfile != null) {
        ncfile.close();
      }
      ncfile = null;
    } catch (IOException ioe) {
      System.out.printf("Error closing %n");
    }
  }
}
 

/**
 * ncdump that parses a command string.
 *
 * @param command command string
 * @param out send output here
 * @param ct allow task to be cancelled; may be null.
 * @return true if successful
 * @throws IOException on write error
 */
public static boolean print(String command, Writer out, ucar.nc2.util.CancelTask ct) throws IOException {
  // pull out the filename from the command
  String filename;
  StringTokenizer stoke = new StringTokenizer(command);
  if (stoke.hasMoreTokens())
    filename = stoke.nextToken();
  else {
    out.write(usage);
    return false;
  }

  try (NetcdfFile nc = NetcdfDataset.openFile(filename, ct)) {
    // the rest of the command
    int pos = command.indexOf(filename);
    command = command.substring(pos + filename.length());
    return print(nc, command, out, ct);

  } catch (java.io.FileNotFoundException e) {
    out.write("file not found= ");
    out.write(filename);
    return false;

  } finally {
    out.close();
  }
}
 

public static void timeChannelWriter(String location, String fileOut) throws IOException, InvalidRangeException {
  long startTime = System.currentTimeMillis();

  NetcdfFile ncfile = NetcdfDataset.openFile(location, null);

  FileOutputStream fout = new FileOutputStream(fileOut);
  N3channelWriter.writeToChannel(ncfile, fout.getChannel());
  long diff = System.currentTimeMillis() - startTime; // msecs

  File result = new File(fileOut);
  double size = .001 * result.length(); // km
  double rate = size / diff; // Mb/sec
  System.out
      .println("N3channelWriter.writeToFile " + location + "  took " + diff + " msecs rate= " + rate + " Mb/sec");
}
 

@Override
public int doAct(String filename) throws IOException {
  if (deleteUncompress && filename.endsWith(".uncompress")) {
    File uf = new File(filename);
    if (!uf.delete())
      System.out.printf("Failed to delete %s%n", filename);
    return 0;
  }

  try (NetcdfFile ncfile = NetcdfDataset.openFile(filename, null)) {
    return testRead(ncfile);
  }
}
 

@Test
public void testCoordSys() throws IOException {
  // NetcdfDataset ncd = NetcdfDataset.openDataset(
  // "dods://localhost:8080/thredds/dodsC/testAll/Level2_KSOX_20051010_2322.ar2v", false, null);
  String filename = TestDir.cdmUnitTestDir + "formats/nexrad/level2/Level2_KYUX_20060527_2335.ar2v";
  try (NetcdfFile ncfile = NetcdfDataset.openFile(filename, null)) {
    testCoordSystem(ncfile);
  }
}
 

@Override
public int doAct(String filename) throws IOException {
  if (deleteUncompress && !filename.endsWith(".bz2")) {
    File uf = new File(filename);
    if (!uf.delete())
      System.out.printf("Failed to delete %s%n", filename);
    return 0;
  }

  try (NetcdfFile ncfile = NetcdfDataset.openFile(filename, null)) {
    testRead(ncfile);
    testCoordSystem(ncfile);
    return 1;
  }
}
 

static void testN3() throws IOException {
  NetcdfFile ncfile = NetcdfDataset.openFile("C:/data/test2.nc", null);
  measureSize("beforeRead", ncfile, null, true);

  for (Variable v : ncfile.getVariables()) {
    v.read();
  }
  measureSize("afterRead", ncfile, null, true);

  ncfile.close();
}
 

private static int compareDatasetsOld(String local, String remote, boolean readData) throws IOException {
  try (NetcdfFile ncfile = NetcdfDataset.openFile(local, null); NetcdfFile ncremote = new CdmRemote(remote)) {

    Formatter f = new Formatter();
    CompareNetcdf2 mind = new CompareNetcdf2(f, false, false, readData);
    boolean ok = mind.compare(ncfile, ncremote, new NcstreamObjFilter());
    if (!ok) {
      System.out.printf("--Compare %s to %s%n", local, remote);
      System.out.printf("  %s%n", f);
    }
    Assert.assertTrue(local + " != " + remote, ok);
  }
  return 1;
}
 

/**
 * ncdump-like print of netcdf file.
 *
 * @param filename NetcdfFile to open
 * @param out print to this stream
 * @param showAll dump all variable data
 * @param showCoords only print header and coordinate variables
 * @param ncml print NcML representation (other arguments are ignored)
 * @param strict print strict CDL representation
 * @param varNames semicolon delimited list of variables whose data should be printed
 * @param ct allow task to be cancelled; may be null.
 * @return true if successful
 * @throws IOException on write error
 */
public static boolean print(String filename, Writer out, boolean showAll, boolean showCoords, boolean ncml,
    boolean strict, String varNames, ucar.nc2.util.CancelTask ct) throws IOException {
  try (NetcdfFile nc = NetcdfDataset.openFile(filename, ct)) {
    return print(nc, out, showAll, showCoords, ncml, strict, varNames, ct);
  } catch (java.io.FileNotFoundException e) {
    out.write("file not found= ");
    out.write(filename);
    out.flush();
    return false;
  }
}