// 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;
}
}
/**
* ************************************************************************ 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");
}