private String generateDataTableJson(TimeChartData chartData) throws DataSourceException {
DataTable data = new DataTable();
ArrayList<ColumnDescription> cd = new ArrayList<ColumnDescription>();
cd.add(new ColumnDescription("date", ValueType.DATETIME, "Date"));
for (String serie : chartData.getSeries()) {
cd.add(new ColumnDescription(serie, ValueType.NUMBER, serie));
}
data.addColumns(cd);
try {
for (TimeChartDataValue timeSerie : chartData.getValues()) {
TableRow row = new TableRow();
GregorianCalendar calendar = (GregorianCalendar) GregorianCalendar.getInstance();
calendar.setTimeZone(TimeZone.getTimeZone("GMT"));
calendar.setTimeInMillis(
TimeZone.getDefault().getOffset(timeSerie.getTimestamp().getTime())
+ timeSerie.getTimestamp().getTime());
row.addCell(new TableCell(new DateTimeValue(calendar)));
for (Double value : timeSerie.getValues()) {
if (value != null) {
row.addCell(value);
} else {
row.addCell(Value.getNullValueFromValueType(ValueType.NUMBER));
}
}
data.addRow(row);
}
} catch (TypeMismatchException e) {
System.out.println("Invalid type!");
}
Query query = new Query();
DataSourceParameters parameters = new DataSourceParameters("");
DataSourceRequest request = new DataSourceRequest(query, parameters, ULocale.UK);
String generateResponse = DataSourceHelper.generateResponse(data, request);
return generateResponse;
}
public DataTable generateDataTable(Query query, HttpServletRequest request)
throws DataSourceException {
String url = request.getParameter("url");
System.out.println(
new Timestamp((new java.util.Date()).getTime())
+ "\t--\tAZ\tRead datasource from "
+ url
+ "\treadCSVdatasource");
if (StringUtils.isEmpty(url)) {
System.out.println(
new Timestamp((new java.util.Date()).getTime())
+ "\t--\tERR\tURL parameter not provided\treadCSVdatasource");
url = getServletContext().getRealPath("data1.csv");
// throw new DataSourceException(ReasonType.INVALID_REQUEST, "url parameter not provided");
}
// System.out.println("reading file "+ url);
Reader reader;
try {
reader = new BufferedReader(new InputStreamReader(new URL(url).openStream()));
} catch (MalformedURLException e) {
System.out.println(
new Timestamp((new java.util.Date()).getTime())
+ "\t--\tERR\tURL is malformed: "
+ url
+ "\treadCSVdatasource");
throw new DataSourceException(ReasonType.INVALID_REQUEST, "url is malformed: " + url);
} catch (IOException e) {
System.out.println(
new Timestamp((new java.util.Date()).getTime())
+ "\t--\tERR\tCouldn't open URL: "
+ url
+ " "
+ e.getMessage()
+ "\treadCSVdatasource");
throw new DataSourceException(ReasonType.INVALID_REQUEST, "Couldn't read from url: " + url);
}
DataTable dataTable = null;
ULocale requestLocale = DataSourceHelper.getLocaleFromRequest(request);
try {
// Note: We assume that all the columns in the CSV file are text columns. In cases where the
// column types are known in advance, this behavior can be overridden by passing a list of
// ColumnDescription objects specifying the column types. See CsvDataSourceHelper.read() for
// more details.
dataTable = CsvDataSourceHelper.read(reader, null, true, requestLocale);
} catch (IOException e) {
System.out.println(
new Timestamp((new java.util.Date()).getTime())
+ "\t--\tERR\tCouldn't read from URL: "
+ url
+ " "
+ e.getMessage()
+ "\treadCSVdatasource");
throw new DataSourceException(ReasonType.INVALID_REQUEST, "Couldn't read from url: " + url);
}
System.out.println(
new Timestamp((new java.util.Date()).getTime())
+ "\t--\tAZ\tRead from "
+ url
+ " FINISHED.\treadCSVdatasource");
return dataTable;
}
