Examples of ucar.nc2.dataset.NetcdfDataset$MyNetcdfDatasetFactory

ucar.nc2.dataset.NetcdfDataset
NetcdfDataset extends the netCDF API, adding standard attribute parsing such as scale and offset, and explicit support for Coordinate Systems. A NetcdfDataset wraps a NetcdfFile, or is defined by an NcML document.

Be sure to close the dataset when done, best practice is to enclose in a try/finally block:
```
 NetcdfDataset ncd = null; try { ncd = NetcdfDataset.openDataset(fileName); ... } finally { ncd.close(); } 
```
By default NetcdfDataset is opened with all enhancements turned on. The default "enhance mode" can be set through setDefaultEnhanceMode(). One can also explicitly set the enhancements you want in the dataset factory methods. The enhancements are:
- ScaleMissing : process scale/offset/missing attributes, and automatically convert the data.
- ScaleMissingDefer : process scale/offset/missing attributes, but dont automatically convert the data. You can call VariableEnhanced.convertScaleOffsetMissing() on the data manually.
- CoordSystem : extract CoordinateSystem using the CoordSysBuilder plug-in mechanism
- ConvertEnums : automaticlly convert enum values to their corresponding Strings. If you want to do this manually, you can call Variable.lookupEnumString() manually.
Automatic ScaleMissing processing has some overhead, and if you need maximum performance, but still want to use scale/offset/missing value handling, open the NetcdfDataset with ScaleMissingDefer. The VariableDS data type is not promoted, and the data is not converted on a read, but you can call the convertScaleOffsetMissing() routines which will do the conversion on a point-by-point basis. @author caron @see ucar.nc2.NetcdfFile

      if (ncml == null) {
        gds = GridDataset.open( mfile.getPath());


      } else {
        NetcdfFile nc = NetcdfDataset.acquireFile(mfile.getPath(), null);
        NetcdfDataset ncd = NcMLReader.mergeNcML(nc, ncml); // create new dataset
        ncd.enhance(); // now that the ncml is added, enhance "in place", ie modify the NetcdfDataset
        gds = new GridDataset(ncd);
      }


      // System.out.println("gds dataset= "+ gds.getNetcdfDataset());

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      }


      return result;
    }


    NetcdfDataset ncd = openDataset(invDataset, true, task, result.errLog);
    if (null != ncd)
      result.featureDataset = FeatureDatasetFactoryManager.wrap(result.featureType, ncd, task, result.errLog);


    if (null == result.featureDataset)
      result.fatalError = true;

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      result.featureDataset = CdmrFeatureDataset.factory(wantFeatureType, access.getStandardUrlName());


    } else {


      // all other datatypes
      NetcdfDataset ncd = openDataset(access, true, task, result);
      if (null != ncd) {
        result.featureDataset = FeatureDatasetFactoryManager.wrap(result.featureType, ncd, task, result.errLog);
      }
    }

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   * @return NetcdfDataset or null if failure
   * @throws IOException on read error
   */
  public NetcdfDataset openDataset(InvDataset invDataset, boolean acquire, ucar.nc2.util.CancelTask task, Formatter log) throws IOException {
    Result result = new Result();
    NetcdfDataset ncd = openDataset(invDataset, acquire, task, result);
    if (log != null) log.format("%s", result.errLog);
    return (result.fatalError) ? null : ncd;
  }

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        accessList = new ArrayList<InvAccess>(rds.getAccess());
        continue;
      }


      // ready to open it through netcdf API
      NetcdfDataset ds;


// try to open
      try {
        ds = openDataset(access, acquire, task, result);

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   * @return NetcdfDataset or null if failure
   * @throws IOException on read error
   */
  public NetcdfDataset openDataset(InvAccess access, boolean acquire, ucar.nc2.util.CancelTask task, Formatter log) throws IOException {
    Result result = new Result();
    NetcdfDataset ncd = openDataset(access, acquire, task, result);
    if (log != null) log.format("%s", result.errLog);
    return (result.fatalError) ? null : ncd;
  }

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      if (rds == null) return null;
      return openDataset(rds, acquire, task, result);
    }


    // ready to open it through netcdf API
    NetcdfDataset ds;


    // open DODS type
    if ((serviceType == ServiceType.OPENDAP) || (serviceType == ServiceType.DODS)) {
      String curl = DODSNetcdfFile.canonicalURL(datasetLocation);
      ds = acquire ? NetcdfDataset.acquireDataset(curl, enhanceMode, task) : NetcdfDataset.openDataset(curl, enhanceMode, task);
    }


    // open CdmRemote
    else if (serviceType == ServiceType.CdmRemote) {
      String curl = CdmRemote.canonicalURL(datasetLocation);
      ds = acquire ? NetcdfDataset.acquireDataset(curl, enhanceMode, task) : NetcdfDataset.openDataset(curl, enhanceMode, task);
    }


    /* open ADDE type
   else if (serviceType == ServiceType.ADDE) {
     try {
       ds = ucar.nc2.adde.AddeDatasetFactory.openDataset(access, task);


     } catch (IOException e) {
       log.append("Cant open as ADDE dataset= "+datasetLocation);
       accessList.remove( access);
       continue;
     }
   } */


    else {
      // open through NetcdfDataset API
      ds = acquire ? NetcdfDataset.acquireDataset(datasetLocation, enhanceMode, task) : NetcdfDataset.openDataset(datasetLocation, enhanceMode, task);
    }


    if (ds != null) {
      ds.setId(datasetId);
      ds.setTitle(title);
      annotate(invDataset, ds);
    }


    // see if there's metadata LOOK whats this
    List list = invDataset.getMetadata(MetadataType.NcML);

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    assert str.equals("http://www.opendap.org") || str.equals("http://www.dods.org") : str;
  }


  public void testDODSwithDataset() throws IOException {
    DODSNetcdfFile dodsfile = TestDODSRead.open("test.04");
    NetcdfDataset ds = new  NetcdfDataset( dodsfile, false);


    // bug in forming dods name
    Variable v = null;
    assert null != (v = ds.findVariable("types.b"));
    v.invalidateCache();
    v.read();
  }

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    System.out.println("--Compare "+localPath+" to "+dodsUrl);
    compareDatasets(dodsUrl, localPath);
  }


  private void compareDatasets(String dodsUrl, String ncfile) throws IOException {
    NetcdfDataset org_ncfile = NetcdfDataset.openDataset(ncfile);
    NetcdfDataset dods_file = NetcdfDataset.openDataset(dodsUrl);
    compareDatasets( org_ncfile, dods_file);
  }

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  }


  public void testBzipProblem() throws IOException, InvalidRangeException {
    // file where there was an error unzipping the file
    String filename = TestAll.cdmUnitTestDir + "formats/nexrad/level2/Level2_KFTG_20060818_1814.ar2v.uncompress.missingradials";
    NetcdfDataset ncd = NetcdfDataset.openDataset( filename);


    VariableDS azi = (VariableDS) ncd.findVariable("azimuthR");
    assert azi != null;
    VariableDS elev = (VariableDS) ncd.findVariable("elevationR");
    assert elev != null;
    VariableDS time = (VariableDS) ncd.findVariable("timeR");
    assert time != null;
    VariableDS r = (VariableDS) ncd.findVariable("Reflectivity");
    assert r != null;
    checkMissingValues(elev, azi, time, r);


    azi = (VariableDS) ncd.findVariable("azimuthV");
    assert azi != null;
    elev = (VariableDS) ncd.findVariable("elevationV");
    assert elev != null;
    time = (VariableDS) ncd.findVariable("timeV");
    assert time != null;
    r = (VariableDS) ncd.findVariable("RadialVelocity");
    assert r != null;
    checkMissingValues(elev, azi, time, r);


    r = (VariableDS) ncd.findVariable("SpectrumWidth");
    assert r != null;
    checkMissingValues(elev, azi, time, r);
  }

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