Java Code Examples for ucar.nc2.NetcdfFile#openInMemory()

/**
 * Open a ucar.nc2.dt.PointObsDataset, write out in CF point format.
 *
 * @param fileIn open through TypedDatasetFactory.open(FeatureType.POINT, ..)
 * @param fileOut write to this netcdf-3 file
 * @param inMemory if true, read file into memory for efficiency
 * @return true on success
 * @throws IOException on read/write error
 */
public static boolean rewritePointObsDataset(String fileIn, String fileOut, boolean inMemory) throws IOException {
  System.out.println("Rewrite2 .nc files from " + fileIn + " to " + fileOut + " inMemory= " + inMemory);

  long start = System.currentTimeMillis();

  // do it in memory for speed
  NetcdfFile ncfile = inMemory ? NetcdfFile.openInMemory(fileIn) : NetcdfFile.open(fileIn);
  NetcdfDataset ncd = new NetcdfDataset(ncfile);

  StringBuilder errlog = new StringBuilder();
  PointObsDataset pobsDataset = (PointObsDataset) TypedDatasetFactory.open(FeatureType.POINT, ncd, null, errlog);
  if (pobsDataset == null)
    return false;

  writePointObsDataset(pobsDataset, fileOut);
  pobsDataset.close();

  long took = System.currentTimeMillis() - start;
  System.out.println(" that took " + (took - start) + " msecs");
  return true;
}
 

/**
 * Open a ucar.nc2.ft.PointFeatureCollection, write out in CF point format.
 *
 * @param fileIn open through TypedDatasetFactory.open(FeatureType.POINT, ..)
 * @param fileOut write to this netcdf-3 file
 * @param inMemory if true, read file into memory for efficiency
 * @return true on success
 * @throws IOException on read/write error
 */
public static boolean rewritePointFeatureDataset(String fileIn, String fileOut, boolean inMemory) throws IOException {
  System.out.println("Rewrite2 .nc files from " + fileIn + " to " + fileOut + " inMemory= " + inMemory);

  long start = System.currentTimeMillis();

  // do it in memory for speed
  NetcdfFile ncfile = inMemory ? NetcdfFile.openInMemory(fileIn) : NetcdfFile.open(fileIn);
  NetcdfDataset ncd = new NetcdfDataset(ncfile);

  Formatter errlog = new Formatter();
  FeatureDataset fd = FeatureDatasetFactoryManager.wrap(FeatureType.ANY_POINT, ncd, null, errlog);
  if (fd == null)
    return false;

  if (fd instanceof FeatureDatasetPoint) {
    writePointFeatureCollection((FeatureDatasetPoint) fd, fileOut);
    fd.close();
    long took = System.currentTimeMillis() - start;
    System.out.println(" that took " + (took - start) + " msecs");
    return true;
  }

  return false;

}
 

@Test
public void shouldGetAllVariables() throws Exception {
  MvcResult mvc = this.mockMvc.perform(requestBuilder).andReturn();
  assertEquals(200, mvc.getResponse().getStatus());

  // Open the binary response in memory
  // NetcdfFile nf = NetcdfFile.openInMemory("test_data.ncs", response.getContentAsByteArray() );
  NetcdfFile nf;
  GridDataset gdsDataset;
  if (TestDir.cdmUseBuilders) {
    nf = NetcdfFiles.openInMemory("test_data.ncs", mvc.getResponse().getContentAsByteArray());
    gdsDataset =
        new ucar.nc2.dt.grid.GridDataset(NetcdfDatasets.enhance(nf, NetcdfDataset.getDefaultEnhanceMode(), null));
  } else {
    nf = NetcdfFile.openInMemory("test_data.ncs", mvc.getResponse().getContentAsByteArray());
    gdsDataset = new ucar.nc2.dt.grid.GridDataset(new NetcdfDataset(nf));
  }

  assertTrue(gdsDataset.getCalendarDateRange().isPoint());
  assertEquals(7, gdsDataset.getDataVariables().size());

}
 

private void openBinaryOld(byte[] content, String gridName) throws IOException {
  try (NetcdfFile nf = NetcdfFile.openInMemory("test_data.nc", content)) {
    GridDataset gdsDataset = new GridDataset(new NetcdfDataset(nf));
    assertNotNull(gdsDataset.findGridByName(gridName));
    logger.debug("{}", nf);
  }
}
 

private void checkGridAsPointNetcdfOld(byte[] content, String varName) throws JDOMException, IOException {
  // Open the binary response in memory
  Formatter errlog = new Formatter();
  try (NetcdfFile nf = NetcdfFile.openInMemory("checkGridAsPointNetcdf.nc", content)) {
    FeatureDataset fd = FeatureDatasetFactoryManager.wrap(FeatureType.STATION, new NetcdfDataset(nf), null, errlog);
    assertNotNull(errlog.toString(), fd);
    VariableSimpleIF v = fd.getDataVariable(varName);
    assertNotNull(varName, v);
  }
}
 

/**
 * Creates a netCDF reader from the UCAR library for the specified data set.
 * We use the UCAR library as a reference implementation for the tests.
 *
 * @param  file  the dataset as one of the {@code NETCDF_*} constants.
 * @return the decoder for the specified dataset.
 * @throws IOException if an I/O error occurred while opening the file.
 */
protected static NetcdfFile createUCAR(final TestData file) throws IOException {
    /*
     * Binary netCDF files need to be read either from a file, or from a byte array in memory.
     * Reading from a file is not possible if the test file is in geoapi-conformance JAR file.
     * But since those test files are less than 15 kilobytes, loading them in memory is okay.
     */
    String location = file.location().toString();
    location = location.substring(location.lastIndexOf('/') + 1);
    return NetcdfFile.openInMemory(location, file.content());
}