Example #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();
    }
  }
Example #2
0
  public void doGetHELP(ReqState rs) throws Exception {
    HttpServletResponse response = rs.getResponse();

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

    PrintWriter pw = new PrintWriter(new OutputStreamWriter(response.getOutputStream()));
    printHelpPage(pw);
    pw.flush();
  }
Example #3
0
  public void doGetVER(ReqState rs) throws Exception {
    HttpServletResponse response = rs.getResponse();

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

    PrintWriter pw = new PrintWriter(new OutputStreamWriter(response.getOutputStream()));

    pw.println("Server Version: " + getServerVersion());
    pw.flush();
  }
Example #4
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();
    }
  }
Example #5
0
  /**
   * ************************************************************************ Prints the Bad URL
   * Page page to the passed PrintWriter
   *
   * @param pw PrintWriter stream to which to dump the bad URL page.
   */
  private void printBadURLPage(PrintWriter pw) {

    String serverContactName = ThreddsConfig.get("serverInformation.contact.name", "UNKNOWN");
    String serverContactEmail = ThreddsConfig.get("serverInformation.contact.email", "UNKNOWN");
    pw.println("<h3>Error in URL</h3>");
    pw.println("The URL extension did not match any that are known by this");
    pw.println("server. Below is a list of the five extensions that are be recognized by");
    pw.println("all OPeNDAP servers. If you think that the server is broken (that the URL you");
    pw.println("submitted should have worked), then please contact the");
    pw.println("administrator of this server [" + serverContactName + "] at: ");
    pw.println("<a href='mailto:" + serverContactEmail + "'>" + serverContactEmail + "</a><p>");
  }
Example #6
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();
    }
  }
Example #7
0
  private void sendErrorResponse(HttpServletResponse response, int errorCode, String errorMessage) {
    try {
      log.info(UsageLog.closingMessageForRequestContext(errorCode, -1));
      response.setStatus(errorCode);
      response.setHeader("Content-Description", "dods-error");
      response.setContentType("text/plain");

      PrintWriter pw = new PrintWriter(response.getOutputStream());
      pw.println("Error {");
      pw.println("    code = " + errorCode + ";");
      pw.println("    message = \"" + errorMessage + "\";");

      pw.println("};");
      pw.flush();
    } catch (Exception e) {
      System.err.println("sendErrorResponse: " + e);
    }
  }
Example #8
0
  /**
   * ************************************************************************ Prints the OPeNDAP
   * Server help page to the passed PrintWriter
   *
   * @param pw PrintWriter stream to which to dump the help page.
   */
  private void printHelpPage(PrintWriter pw) {

    pw.println("<h3>OPeNDAP Server Help</h3>");
    pw.println("To access most of the features of this OPeNDAP server, append");
    pw.println(
        "one of the following a eight suffixes to a URL: .das, .dds, .dods, .ddx, .blob, .info,");
    pw.println(".ver or .help. Using these suffixes, you can ask this server for:");
    pw.println("<dl>");
    pw.println("<dt> das  </dt> <dd> Dataset Attribute Structure (DAS)</dd>");
    pw.println("<dt> dds  </dt> <dd> Dataset Descriptor Structure (DDS)</dd>");
    pw.println("<dt> dods </dt> <dd> DataDDS object (A constrained DDS populated with data)</dd>");
    pw.println("<dt> ddx  </dt> <dd> XML version of the DDS/DAS</dd>");
    pw.println(
        "<dt> blob </dt> <dd> Serialized binary data content for requested data set, "
            + "with the constraint expression applied.</dd>");
    pw.println("<dt> info </dt> <dd> info object (attributes, types and other information)</dd>");
    pw.println("<dt> html </dt> <dd> html form for this dataset</dd>");
    pw.println("<dt> ver  </dt> <dd> return the version number of the server</dd>");
    pw.println("<dt> help </dt> <dd> help information (this text)</dd>");
    pw.println("</dl>");
    pw.println("For example, to request the DAS object from the FNOC1 dataset at URI/GSO (a");
    pw.println("test dataset) you would appand `.das' to the URL:");
    pw.println("http://opendap.gso.url.edu/cgi-bin/nph-nc/data/fnoc1.nc.das.");

    pw.println("<p><b>Note</b>: Many OPeNDAP clients supply these extensions for you so you don't");
    pw.println("need to append them (for example when using interfaces supplied by us or");
    pw.println("software re-linked with a OPeNDAP client-library). Generally, you only need to");
    pw.println("add these if you are typing a URL directly into a WWW browser.");
    pw.println("<p><b>Note</b>: If you would like version information for this server but");
    pw.println("don't know a specific data file or data set name, use `/version' for the");
    pw.println("filename. For example: http://opendap.gso.url.edu/cgi-bin/nph-nc/version will");
    pw.println("return the version number for the netCDF server used in the first example. ");

    pw.println("<p><b>Suggestion</b>: If you're typing this URL into a WWW browser and");
    pw.println("would like information about the dataset, use the `.info' extension.");

    pw.println("<p>If you'd like to see a data values, use the `.html' extension and submit a");
    pw.println("query using the customized form.");
  }