/** Read a segment from an input stream. */
static Segment read(java.io.BufferedReader is, char encoding[]) throws Exception {
String line = is.readLine();
Segment seg = null;
seg = new Segment(line.substring(0, 3));
char dlim = line.charAt(3);
String data = line.substring(4);
int start = 1;
if (seg.name.equals("MSH")) {
// get the encoding characters out first
DelimitedString ds = new DelimitedString(data, dlim, ' ');
String enc = ds.getValue();
encoding[0] = dlim;
encoding[1] = enc.charAt(0);
encoding[2] = enc.charAt(1);
if (enc.length() > 2) encoding[3] = enc.charAt(2);
if (enc.length() > 3) encoding[4] = enc.charAt(3);
data = line.substring(5 + enc.length());
start = 3;
}
DelimitedString ds = new DelimitedString(data, encoding[0], encoding[3]);
while (ds.hasValues()) {
String val = ds.getValue();
Field fld = new Field();
fld.decode(val, encoding);
seg.setField(start, fld);
start++;
}
return seg;
}
/**
* Method for reading in data file, in a given format. Namely:
*
* <pre>
* 881003,0.0000,14.1944,13.9444,14.0832,2200050,0
* 881004,0.0000,14.1668,14.0556,14.1668,1490850,0
* ...
* 990108,35.8125,36.7500,35.5625,35.8125,4381200,0
* 990111,35.8125,35.8750,34.8750,35.1250,3920800,0
* 990112,34.8750,34.8750,34.0000,34.0625,3577500,0
* </pre>
*
* <p>Where the fields represent, one believes, the following:
*
* <ol>
* <li>The date in 'YYMMDD' format
* <li>Open
* <li>High
* <li>Low
* <li>Last
* <li>Volume
* <li>Open Interest
* </ol>
*
* One will probably make use of the closing price, but this can be redefined via the class
* variable <code>DATUMFIELD</code>. Note that since the read in data are then used to compute the
* return, this would be a good place to trap for zero values in the data, which will cause all
* sorts of problems.
*
* @param dirName the directory in which to search for the data file.
* @param filename the data filename itself.
* @exception DemoException thrown if there was a problem with the data file.
*/
private void readRatesFile(String dirName, String filename) throws DemoException {
java.io.File ratesFile = new File(filename);
java.io.BufferedReader in;
try {
InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream(filename);
// if( ! ratesFile.canRead() ) {
// throw new DemoException("Cannot read the file "+ratesFile.toString());
// }
in = new BufferedReader(new InputStreamReader(inputStream));
} catch (Exception fnfex) {
throw new DemoException(fnfex.toString());
}
//
// Proceed to read all the lines of data into a Vector object.
int iLine = 0, initNlines = 100, nLines = 0;
String aLine;
java.util.Vector allLines = new Vector(initNlines);
try {
while ((aLine = in.readLine()) != null) {
iLine++;
//
// Note, I'm not entirely sure whether the object passed in is copied
// by value, or just its reference.
allLines.addElement(aLine);
}
} catch (IOException ioex) {
throw new DemoException("Problem reading data from the file " + ioex.toString());
}
nLines = iLine;
//
// Now create an array to store the rates data.
this.pathValue = new double[nLines];
this.pathDate = new int[nLines];
nAcceptedPathValue = 0;
iLine = 0;
for (java.util.Enumeration enum1 = allLines.elements(); enum1.hasMoreElements(); ) {
aLine = (String) enum1.nextElement();
String[] field = Utilities.splitString(",", aLine);
int aDate = Integer.parseInt("19" + field[0]);
//
// static double Double.parseDouble() method is a feature of JDK1.2!
double aPathValue = Double.valueOf(field[DATUMFIELD]).doubleValue();
if ((aDate <= MINIMUMDATE) || (Math.abs(aPathValue) < EPSILON)) {
dbgPrintln("Skipped erroneous data in " + filename + " indexed by date=" + field[0] + ".");
} else {
pathDate[iLine] = aDate;
pathValue[iLine] = aPathValue;
iLine++;
}
}
//
// Record the actual number of accepted data points.
nAcceptedPathValue = iLine;
//
// Now to fill in the structures from the 'PathId' class.
set_name(ratesFile.getName());
set_startDate(pathDate[0]);
set_endDate(pathDate[nAcceptedPathValue - 1]);
set_dTime((double) (1.0 / 365.0));
}
