Exemplo n.º 1
0
  public void doGetDDS(ReqState rs) throws Exception {
    HttpServletResponse response = rs.getResponse();

    GuardedDataset ds = null;
    try {
      ds = getDataset(rs);
      if (null == ds) return;

      response.setContentType("text/plain");
      response.setHeader("XDODS-Server", getServerVersion());
      response.setHeader("Content-Description", "dods-dds");

      OutputStream out = new BufferedOutputStream(response.getOutputStream());
      ServerDDS myDDS = ds.getDDS();

      if (rs.getConstraintExpression().equals("")) { // No Constraint Expression?
        // Send the whole DDS
        myDDS.print(out);
        out.flush();

      } else { // Otherwise, send the constrained DDS
        // Instantiate the CEEvaluator and parse the constraint expression
        CEEvaluator ce = new CEEvaluator(myDDS);
        ce.parseConstraint(rs);

        // Send the constrained DDS back to the client
        PrintWriter pw = new PrintWriter(new OutputStreamWriter(out));
        myDDS.printConstrained(pw);
        pw.flush();
      }

    } finally { // release lock if needed
      if (ds != null) ds.release();
    }
  }
Exemplo n.º 2
0
  public void doGetDAP2Data(ReqState rs) throws Exception {
    HttpServletResponse response = rs.getResponse();

    GuardedDataset ds = null;
    try {
      ds = getDataset(rs);
      if (null == ds) return;

      response.setContentType("application/octet-stream");
      response.setHeader("XDODS-Server", getServerVersion());
      response.setHeader("Content-Description", "dods-data");

      ServletOutputStream sOut = response.getOutputStream();
      OutputStream bOut;
      DeflaterOutputStream dOut = null;
      if (rs.getAcceptsCompressed() && allowDeflate) {
        response.setHeader("Content-Encoding", "deflate");
        dOut = new DeflaterOutputStream(sOut);
        bOut = new BufferedOutputStream(dOut);

      } else {
        bOut = new BufferedOutputStream(sOut);
      }

      ServerDDS myDDS = ds.getDDS();
      CEEvaluator ce = new CEEvaluator(myDDS);
      ce.parseConstraint(rs);
      checkSize(myDDS, false);

      // Send the constrained DDS back to the client
      PrintWriter pw = new PrintWriter(new OutputStreamWriter(bOut));
      myDDS.printConstrained(pw);

      // Send the Data delimiter back to the client
      pw.flush();
      bOut.write("\nData:\n".getBytes());
      bOut.flush();

      // Send the binary data back to the client
      DataOutputStream sink = new DataOutputStream(bOut);
      ce.send(myDDS.getEncodedName(), sink, ds);
      sink.flush();

      // Finish up sending the compressed stuff, but don't
      // close the stream (who knows what the Servlet may expect!)
      if (null != dOut) dOut.finish();
      bOut.flush();

    } finally { // release lock if needed
      if (ds != null) ds.release();
    }
  }
Exemplo n.º 3
0
  /**
   * Server-side serialization for OPeNDAP variables (sub-classes of <code>BaseType</code>). This
   * does not send the entire class as the Java <code>Serializable</code> interface does, rather it
   * sends only the binary data values. Other software is responsible for sending variable type
   * information (see <code>DDS</code>).
   *
   * <p>Writes data to a <code>DataOutputStream</code>. This method is used on the server side of
   * the OPeNDAP client/server connection, and possibly by GUI clients which need to download
   * OPeNDAP data, manipulate it, and then re-save it as a binary file.
   *
   * @param sink a <code>DataOutputStream</code> to write to.
   * @throws IOException thrown on any <code>OutputStream</code> exception.
   * @see BaseType
   * @see DDS
   * @see ServerDDS
   */
  public void serialize(String dataset, DataOutputStream sink, CEEvaluator ce, Object specialO)
      throws NoSuchVariableException, DAP2ServerSideException, IOException {

    if (!isRead()) read(dataset, specialO);

    if (ce.evalClauses(specialO)) externalize(sink);
  }
Exemplo n.º 4
0
  public void doGetASC(ReqState rs) throws Exception {
    HttpServletResponse response = rs.getResponse();

    GuardedDataset ds = null;
    try {
      ds = getDataset(rs);
      if (ds == null) return;

      response.setHeader("XDODS-Server", getServerVersion());
      response.setContentType("text/plain");
      response.setHeader("Content-Description", "dods-ascii");

      log.debug(
          "Sending OPeNDAP ASCII Data For: " + rs + "  CE: '" + rs.getConstraintExpression() + "'");

      ServerDDS dds = ds.getDDS();
      CEEvaluator ce = new CEEvaluator(dds);
      ce.parseConstraint(rs);
      checkSize(dds, true);

      PrintWriter pw = new PrintWriter(response.getOutputStream());
      dds.printConstrained(pw);
      pw.println("---------------------------------------------");

      AsciiWriter writer = new AsciiWriter(); // could be static
      writer.toASCII(pw, dds, ds);

      // the way that getDAP2Data works
      // DataOutputStream sink = new DataOutputStream(bOut);
      // ce.send(myDDS.getName(), sink, ds);

      pw.flush();

    } finally { // release lock if needed
      if (ds != null) ds.release();
    }
  }