Example #1
0
 // Recursively compute size of the dds to be returned
 private long computeSize(DConstructor ctor, boolean isAscii) throws Exception {
   long projectsize = 0; // accumulate size of projected variables
   long othersize = 0; // accumulate size of non-projected variables
   long fieldsize = 0;
   int projectedcount = 0;
   int fieldcount = 0;
   Enumeration vars = ctor.getVariables();
   while (vars.hasMoreElements()) {
     fieldcount++;
     BaseType field = (BaseType) vars.nextElement();
     fieldsize = computeFieldSize(field, isAscii);
     // accumulate the field sizes
     if (field.isProject()) {
       projectsize += fieldsize;
       projectedcount++;
     } else {
       othersize += fieldsize;
     }
   }
   // Cases to consider:
   // 1. If all of the fields of this ctor are projected,
   //    then return projectsize
   // 2. If none of the fields of this ctor are projected,
   //    then return othersize
   // 3. otherwise, at least one field, but not all, is projected,
   //    => return projectsize;
   if (projectedcount == fieldcount) return projectsize;
   else if (projectedcount == 0) return othersize;
   else {
     assert (projectedcount > 0 && projectedcount < fieldcount);
     return projectsize;
   }
 }
Example #2
0
  /**
   * ************************************************************************ Default handler for
   * OPeNDAP ascii requests. Returns OPeNDAP DAP2 data in comma delimited ascii columns for
   * ingestion into some not so OPeNDAP enabled application such as MS-Excel. Accepts constraint
   * expressions in exactly the same way as the regular OPeNDAP dataserver.
   *
   * @param request
   * @param response
   * @param dataSet
   * @throws opendap.dap.DAP2Exception
   * @throws ParseException
   */
  public void sendASCII(HttpServletRequest request, HttpServletResponse response, String dataSet)
      throws DAP2Exception, ParseException {

    if (Debug.isSet("showResponse"))
      System.out.println(
          "Sending OPeNDAP ASCII Data For: "
              + dataSet
              + "    CE: '"
              + request.getQueryString()
              + "'");

    String requestURL, ce;
    DConnect2 url;
    DataDDS dds;

    if (request.getQueryString() == null) {
      ce = "";
    } else {
      ce = "?" + request.getQueryString();
    }

    int suffixIndex = request.getRequestURL().toString().lastIndexOf(".");

    requestURL = request.getRequestURL().substring(0, suffixIndex);

    if (Debug.isSet("showResponse")) {
      System.out.println("New Request URL Resource: '" + requestURL + "'");
      System.out.println("New Request Constraint Expression: '" + ce + "'");
    }

    try {

      if (_Debug) System.out.println("Making connection to .dods service...");
      url = new DConnect2(requestURL, true);

      if (_Debug) System.out.println("Requesting data...");
      dds = url.getData(ce, null, new asciiFactory());

      if (_Debug) System.out.println(" ASC DDS: ");
      if (_Debug) dds.print(System.out);

      PrintWriter pw = new PrintWriter(response.getOutputStream());
      PrintWriter pwDebug = new PrintWriter(System.out);

      if (dds != null) {
        dds.print(pw);
        pw.println("---------------------------------------------");

        String s = "";
        Enumeration e = dds.getVariables();

        while (e.hasMoreElements()) {
          BaseType bt = (BaseType) e.nextElement();
          if (_Debug) ((toASCII) bt).toASCII(pwDebug, true, null, true);
          // bt.toASCII(pw,addName,getNAme(),true);
          ((toASCII) bt).toASCII(pw, true, null, true);
        }
      } else {

        String betterURL =
            request.getRequestURL().substring(0, request.getRequestURL().lastIndexOf("."))
                + ".dods?"
                + request.getQueryString();

        pw.println("-- ASCII RESPONSE HANDLER PROBLEM --");
        pw.println("");
        pw.println("The ASCII response handler was unable to obtain requested data set.");
        pw.println("");
        pw.println("Because this handler calls it's own OPeNDAP server to get the requested");
        pw.println("data the source error is obscured.");
        pw.println("");
        pw.println("To get a better idea of what is going wrong, try requesting the URL:");
        pw.println("");
        pw.println("    " + betterURL);
        pw.println("");
        pw.println("And then look carefully at the returned document. Note that if you");
        pw.println("are using a browser to access the URL the returned document will");
        pw.println("more than likely be treated as a download and written to your");
        pw.println("local disk. It should be a file with the extension \".dods\"");
        pw.println("");
        pw.println("Locate it, open it with a text editor, and find your");
        pw.println("way to happiness and inner peace.");
        pw.println("");
      }

      // pw.println("</pre>");
      pw.flush();
      if (_Debug) pwDebug.flush();

    } catch (FileNotFoundException fnfe) {
      System.out.println("OUCH! FileNotFoundException: " + fnfe.getMessage());
      fnfe.printStackTrace(System.out);
    } catch (MalformedURLException mue) {
      System.out.println("OUCH! MalformedURLException: " + mue.getMessage());
      mue.printStackTrace(System.out);
    } catch (IOException ioe) {
      System.out.println("OUCH! IOException: " + ioe.getMessage());
      ioe.printStackTrace(System.out);
    } catch (Throwable t) {
      System.out.println("OUCH! Throwable: " + t.getMessage());
      t.printStackTrace(System.out);
    }

    if (_Debug) System.out.println(" GetAsciiHandler done");
  }