public void writeRecord(String stnName, Date obsDate, StructureData sdata) throws IOException {
    StationTracker stnTracker = stationMap.get(stnName);
    ProfileTracker proTracker = stnTracker.profileMap.get(obsDate);

    if (proTracker == null) {
      proTracker = new ProfileTracker(profileIndex);
      stnTracker.profileMap.put(obsDate, proTracker);

      stnTracker.link.add(profileIndex);
      stnTracker.lastChild = profileIndex;
      stnTracker.numChildren++;

      try {
        originTime[0] = profileIndex; // 2d index
        timeArray.set(0, dateFormatter.toDateTimeStringISO(obsDate));
        parentArray.set(0, stnTracker.parent_index);
        ncfile.writeStringData(timeName, originTime, timeArray);
        ncfile.write(parentStationIndex, originTime, parentArray);
      } catch (InvalidRangeException e) {
        e.printStackTrace();
        throw new IllegalStateException(e);
      }

      profileIndex++;
    }

    // needs to be wrapped as an ArrayStructure, even though we are only writing one at a time.
    ArrayStructureW sArray = new ArrayStructureW(sdata.getStructureMembers(), new int[] {1});
    sArray.setStructureData(sdata, 0);

    // track the min and max date
    if ((minDate == null) || minDate.after(obsDate)) minDate = obsDate;
    if ((maxDate == null) || maxDate.before(obsDate)) maxDate = obsDate;

    timeArray.set(0, dateFormatter.toDateTimeStringISO(obsDate));
    parentArray.set(0, proTracker.parent_index);

    proTracker.link.add(recno);
    proTracker.lastChild = recno; // not currently used
    proTracker.numChildren++;

    // write the recno record
    origin[0] = recno; // 1d index
    originTime[0] = recno; // 2d index
    try {
      ncfile.write("record", origin, sArray);
      ncfile.write(parentProfileIndex, originTime, parentArray);
    } catch (InvalidRangeException e) {
      e.printStackTrace();
      throw new IllegalStateException(e);
    }

    recno++;
  }
  private void writeDataFinish() throws IOException {
    // finish global variables
    ArrayInt.D0 totalArray = new ArrayInt.D0();
    totalArray.set(profileIndex);
    try {
      ncfile.write(numProfilesTotalName, totalArray);
    } catch (InvalidRangeException e) {
      e.printStackTrace();
      throw new IllegalStateException(e);
    }

    // finish the station data
    int nstns = stnList.size();
    ArrayInt.D1 firstProfileArray = new ArrayInt.D1(nstns);
    ArrayInt.D1 numProfileArray = new ArrayInt.D1(nstns);
    ArrayInt.D1 nextProfileArray = new ArrayInt.D1(nprofiles);

    for (int i = 0; i < stnList.size(); i++) {
      ucar.unidata.geoloc.Station stn = stnList.get(i);
      StationTracker tracker = stationMap.get(stn.getName());

      numProfileArray.set(i, tracker.numChildren);

      int first = (tracker.link.size() > 0) ? tracker.link.get(0) : -1;
      firstProfileArray.set(i, first);

      if (tracker.link.size() > 0) {
        // construct forward link
        List<Integer> nextList = tracker.link;
        for (int j = 0; j < nextList.size() - 1; j++) {
          Integer curr = nextList.get(j);
          Integer next = nextList.get(j + 1);
          nextProfileArray.set(curr, next);
        }
        Integer curr = nextList.get(nextList.size() - 1);
        nextProfileArray.set(curr, -1);
      }
    }

    try {
      ncfile.write(firstProfileName, firstProfileArray);
      ncfile.write(numProfilesName, numProfileArray);
      ncfile.write(nextProfileName, nextProfileArray);

    } catch (InvalidRangeException e) {
      e.printStackTrace();
      throw new IllegalStateException(e);
    }

    // finish the profile data
    ArrayInt.D1 nextObsArray = new ArrayInt.D1(recno);
    ArrayInt.D1 firstObsArray = new ArrayInt.D1(nprofiles);
    ArrayInt.D1 numObsArray = new ArrayInt.D1(nprofiles);

    for (int i = 0; i < stnList.size(); i++) {
      ucar.unidata.geoloc.Station stn = stnList.get(i);
      StationTracker stnTracker = stationMap.get(stn.getName());

      Set<Date> dates = stnTracker.profileMap.keySet();
      for (Date date : dates) {
        ProfileTracker proTracker = stnTracker.profileMap.get(date);
        int trackerIndex = proTracker.parent_index;
        numObsArray.set(trackerIndex, proTracker.numChildren);

        int first = (proTracker.link.size() > 0) ? proTracker.link.get(0) : -1;
        firstObsArray.set(trackerIndex, first);

        if (proTracker.link.size() > 0) {
          // construct forward link
          List<Integer> nextList = proTracker.link;
          for (int j = 0; j < nextList.size() - 1; j++) {
            Integer curr = nextList.get(j);
            Integer next = nextList.get(j + 1);
            nextObsArray.set(curr, next);
          }
          Integer curr = nextList.get(nextList.size() - 1);
          nextObsArray.set(curr, -1);
        }
      }
    }

    try {
      ncfile.write(firstObsName, firstObsArray);
      ncfile.write(numObsName, numObsArray);
      ncfile.write(nextObsName, nextObsArray);

    } catch (InvalidRangeException e) {
      e.printStackTrace();
      throw new IllegalStateException(e);
    }

    // finish the obs data

    ncfile.updateAttribute(
        null, new Attribute("time_coverage_start", dateFormatter.toDateTimeStringISO(minDate)));
    ncfile.updateAttribute(
        null, new Attribute("time_coverage_end", dateFormatter.toDateTimeStringISO(maxDate)));
  }
  @Test
  public void testArraySubset() throws IOException {
    DODSNetcdfFile dodsfile = TestDODSRead.open("test.02?i32[1:10],f64[2:2:10]");

    Variable v = null;
    Array a = null;

    // int32
    assert (null != (v = dodsfile.findVariable("i32")));
    assert v.getFullName().equals("i32");
    assert v.getRank() == 1;
    assert v.getSize() == 10;
    assert v.getDataType() == DataType.INT;
    a = v.read();
    assert a.getRank() == 1;
    assert a.getSize() == 25;
    assert a.getElementType() == int.class;
    assert a instanceof ArrayInt.D1;

    ArrayInt.D1 ai = (ArrayInt.D1) a;
    for (int i = 0; i < 10; i++) {
      int val = ai.get(i);
      assert (val == i * 2048) : val + " != " + (i * 2048);
    }

    // uint16
    assert null == (v = dodsfile.findVariable("ui16"));
    assert null == (v = dodsfile.findVariable("ui32"));

    // double
    assert (null != (v = dodsfile.findVariable("f64")));
    assert v.getFullName().equals("f64");
    assert v.getRank() == 1;
    assert v.getSize() == 5;
    assert v.getDataType() == DataType.DOUBLE : v.getDataType();
    a = v.read();
    assert a.getRank() == 1;
    assert a.getSize() == 25;
    assert a.getElementType() == double.class;
    assert a instanceof ArrayDouble.D1;
    ArrayDouble.D1 ad = (ArrayDouble.D1) a;
    double[] tFloat64 =
        new double[] {
          1.0,
          0.9999500004166653,
          0.9998000066665778,
          0.9995500337489875,
          0.9992001066609779,
          0.9987502603949663,
          0.9982005399352042,
          0.9975510002532796,
          0.9968017063026194,
          0.9959527330119943,
          0.9950041652780257,
          0.9939560979566968,
          0.9928086358538663,
          0.9915618937147881,
          0.9902159962126371,
          0.9887710779360422,
          0.9872272833756269,
          0.9855847669095608,
          0.9838436927881214,
          0.9820042351172703,
          0.9800665778412416,
          0.9780309147241483,
          0.9758974493306055,
          0.9736663950053749,
          0.9713379748520297
        };

    for (int i = 0; i < 5; i++) {
      double val = ad.get(i);
      assert Misc.closeEnough(val, tFloat64[i], 1.0e-9);
    }

    dodsfile.close();
  }