/**
* Load and Attach a DataSet from a File. The method loads the data into a DataSet class and
* attaches the class to the graph for plotting.
*
* <p>The data is assumed to consist (at this stage) 2 ASCII columns of numbers x, y. As always
* blank lines are ignored and everything following # is ignored as a comment.
*
* @param file The URL of the data file to read.
* @return The DataSet constructed containing the data read.
*/
public DataSet loadFile(URL file) {
byte b[] = new byte[50];
int nbytes = 0;
int max = 100;
int inc = 100;
int n = 0;
double data[] = new double[max];
InputStream is = null;
boolean comment = false;
int c;
try {
is = file.openStream();
while ((c = is.read()) > -1) {
switch (c) {
case '#':
comment = true;
break;
case '\r':
case '\n':
comment = false;
case ' ':
case '\t':
if (nbytes > 0) {
String s = new String(b, 0, 0, nbytes);
data[n] = Double.valueOf(s).doubleValue();
n++;
if (n >= max) {
max += inc;
double d[] = new double[max];
System.arraycopy(data, 0, d, 0, n);
data = d;
}
nbytes = 0;
}
break;
default:
if (!comment) {
b[nbytes] = (byte) c;
nbytes++;
}
break;
}
}
if (is != null) is.close();
} catch (Exception e) {
System.out.println("Failed to load Data set from file ");
e.printStackTrace();
if (is != null)
try {
is.close();
} catch (Exception ev) {
}
return null;
}
return loadDataSet(data, n / 2);
}
