/**
* @param ticker The ticker of the stock to look up.
* @return A retrieval.CSV that contains the given stock's data over the past year.
* @throws ConnectionException if it has problems connecting to Yahoo.
* @throws exceptions.MissingCSVDataException if Yahoo does not have any data for the given stock.
*/
public synchronized YahooCSV getStockData(String ticker)
throws ConnectionException, MissingCSVDataException {
boolean connectionsuccess = false;
while (!connectionsuccess) {
try {
String contents =
client
.getPage(
new StringBuilder("http://real-chart.finance.yahoo.com/table.csv?s=")
.append(ticker)
.toString())
.getWebResponse()
.getContentAsString();
if (contents.charAt(0) == '<') {
throw new MissingCSVDataException("No data exists for this stock");
}
final YahooCSV csv = new YahooCSV(contents, ticker);
connectionsuccess = true;
client.close();
System.out.println(new StringBuilder(ticker).append(" connected to Yahoo").toString());
return csv;
} catch (UnknownHostException uhe) {
// Connection error.
System.out.println(
new StringBuilder("Exception in retrieval.")
.append("InternetConnection.getStockData(")
.append(ticker)
.append(")")
.toString());
System.out.println(uhe.toString());
System.out.println("Waiting to reconnect.");
try {
Thread.sleep(5000);
} catch (Exception e) {
System.out.println(
new StringBuilder("Exception in ")
.append("retrieval.InternetConnection.getStockData(")
.append(ticker)
.append(")")
.toString());
System.out.println(uhe.toString());
}
} catch (MissingCSVDataException mcsvde) {
// There is no CSV data for this stock.
System.out.println(
new StringBuilder("Exception in ")
.append("retrieval.InternetConnection.getStockData(")
.append(ticker)
.append(")")
.toString());
System.out.println(mcsvde.toString());
connectionsuccess = true;
client.close();
} catch (Exception e) {
System.out.println(
new StringBuilder("Exception in ")
.append("retrieval.InternetConnection.getStockData(")
.append(ticker)
.append(")")
.toString());
System.out.println(e.toString());
}
}
throw new ConnectionException(
new StringBuilder("Unable to find CSV File for ").append(ticker).toString());
}
/**
* @param ticker The ticker of the stock to look up.
* @param startdate The first date of the range of dates over which to search.
* @return A retrieval.CSV that contains the given stock's data over the past year.
* @throws ConnectionException if it has problems connecting to Yahoo.
* @throws exceptions.MissingCSVDataException if Yahoo does not have any data for the given stock.
* @throws exceptions.InvalidStartDateException if the start date is equal to or after the current
* date.
*/
public synchronized YahooCSV getStockData(String ticker, GregorianCalendar startdate)
throws ConnectionException, MissingCSVDataException, InvalidStartDateException {
// Make sure that the start date is before today!
GregorianCalendar today = new GregorianCalendar();
if (!startdate.before(today)) {
throw new InvalidStartDateException("The start date must be before the current date.");
}
// This connection loop will re-connect to Yahoo if the initial and
// subsequent attempts fail.
boolean connectionsuccess = false;
while (!connectionsuccess) {
try {
String contents =
client
.getPage(
new StringBuilder("http://real-chart.finance.yahoo.com/table.csv?s=")
.append(ticker)
.append("&a=")
.append(startdate.get(Calendar.MONTH))
.append("&b=")
.append(startdate.get(Calendar.DATE))
.append("&c=")
.append(startdate.get(Calendar.YEAR))
.toString())
.getWebResponse()
.getContentAsString();
if (contents.charAt(0) == '<') {
// There is no stock data for the given ticker, and Yahoo
// has responded with an error page rather than a CSV.
throw new MissingCSVDataException("No data exists for this stock");
}
final YahooCSV csv = new YahooCSV(contents, ticker);
connectionsuccess = true;
client.close();
System.out.println(ticker + " connected to Yahoo.");
return csv;
} catch (UnknownHostException uhe) {
// Connection error.
System.out.println(
new StringBuilder("Exception in ")
.append("retrieval.InternetConnection.getStockData(")
.append(ticker)
.append(")")
.toString());
System.out.println(uhe.toString());
System.out.println("Waiting to reconnect.");
try {
Thread.sleep(5000);
} catch (Exception e) {
System.out.println(
new StringBuilder("Exception in ")
.append("retrieval.InternetConnection.getStockData(")
.append(ticker)
.append(")")
.toString());
System.out.println(uhe.toString());
}
} catch (MissingCSVDataException mcsvde) {
// There is no CSV data for this stock.
System.out.println(
new StringBuilder("Exception in ")
.append("retrieval.InternetConnection.getStockData(")
.append(ticker)
.append(")")
.toString());
System.out.println(mcsvde.toString());
connectionsuccess = true;
client.close();
} catch (Exception e) {
System.out.println(
new StringBuilder("Exception in ")
.append("retrieval.InternetConnection.getStockData(")
.append(ticker)
.append(")")
.toString());
System.out.println(e.toString());
}
}
throw new ConnectionException(
new StringBuilder("Unable to find CSV File for ").append(ticker).toString());
}
