/** Reads the next key/value pair from the input for processing. */
public boolean next(Text key, SequencedFragment value) throws IOException {
if (pos >= end) return false; // past end of slice
int bytesRead = 0;
boolean goodRecord;
do {
bytesRead = lowLevelQseqRead(key, value); // if bytesRead <= 0 EOF has been reached
goodRecord =
(bytesRead > 0)
&& (!filterFailedQC || value.getFilterPassed() == null || value.getFilterPassed());
} while (bytesRead > 0 && !goodRecord);
if (goodRecord) // post process the record only if it's going to be used
{
try {
postProcessSequencedFragment(value);
} catch (FormatException e) {
throw new FormatException(
e.getMessage()
+ " Position: "
+ makePositionMessage(this.pos - bytesRead)
+ "; line: "
+ buffer); // last line read is still in the buffer
}
}
return goodRecord;
}
boolean nextCommand() {
System.out.print(
"\n["
+ calc.getBase().getName()
+ ","
+ calc.getFormat().getName()
+ ","
+ calc.firstOperand()
+ ", "
+ calc.secondOperand()
+ "] >"); // Print huidige waarden van calc.
try {
// reads the command from the keyboard
String command = lineReader.readLine(); // Lees input.
while (command == null) { //
if (prevReader != null) {
lineReader = prevReader;
prevReader = null;
command = lineReader.readLine();
} else {
return false;
}
}
/*
* Acties die uitgevoerd worden bij herkenning van een operator.
*/
if (command.equals("+")) calc.add();
else if (command.equals("-")) calc.subtract();
else if (command.equals("*")) calc.multiply();
else if (command.equals("/")) calc.divide();
else if (command.equals("dec")) calc.setBase(new DecimalBase());
else if (command.equals("bin")) calc.setBase(new BinaryBase());
else if (command.equals("oct")) calc.setBase(new OctalBase());
else if (command.equals("hex")) calc.setBase(new HexBase());
else if (command.equals("rat")) calc.setFormat(new RationalFormat());
else if (command.equals("fixed")) calc.setFormat(new FixedPointFormat());
else if (command.equals("float")) calc.setFormat(new FloatingPointFormat());
else if (command.equals("del")) calc.delete();
else if (command.indexOf("op") >= 0) {
command = command.substring(2).trim();
try {
calc.addOperand(command);
} catch (FormatException e) {
System.out.println("Wrong operand: " + e.getMessage());
}
} else if (command.indexOf("read") >= 0) {
try {
BufferedReader file = new BufferedReader(new FileReader(command.substring(4).trim()));
prevReader = lineReader;
lineReader = file;
System.out.println("Reading from file " + command.substring(4).trim());
} catch (Exception e) {
System.out.println("Cannot open file " + command.substring(4).trim());
}
} else if (command.equals("help")) {
printHelp();
} else if (command.equals("exit")) return false;
else {
System.out.println("Error! Not a valid command");
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
return true;
}
