/**
* If the argument is the <i>numberOfBits</i> parameter, then set the production rate of the
* output port.
*
* @param attribute The attribute that has changed.
* @exception IllegalActionException If the parameter is out of range.
*/
public void attributeChanged(Attribute attribute) throws IllegalActionException {
if (attribute == numberOfBits) {
int rate = ((IntToken) numberOfBits.getToken()).intValue();
if ((rate < 1) || (rate > 32)) {
throw new IllegalActionException(this, "Invalid number of bits: " + rate);
}
} else {
super.attributeChanged(attribute);
}
}
/**
* Consume a single IntToken on the input. Produce <i>numberOfBits</i> BooleanTokens on the output
* port which is the bitwise representation of the input IntToken. The most significant bit (the
* sign bit) is the first boolean token send out. The least significant bit is the last boolean
* token send out.
*
* @exception IllegalActionException If there is no director. or if the input integer is out of
* range.
*/
public final void fire() throws IllegalActionException {
super.fire();
int rate = ((IntToken) numberOfBits.getToken()).intValue();
BooleanToken[] bits = new BooleanToken[rate];
IntToken token = (IntToken) (input.get(0));
int integer = token.intValue();
if (integer < 0) {
if (integer < -(1 << (rate - 1))) {
throw new IllegalActionException(this, "integer is out of range.");
}
bits[0] = new BooleanToken(true);
// integer = (int)(2147483648L + integer);
integer = ((1 << (rate - 1)) + integer);
} else {
if (integer > ((1 << (rate - 1)) - 1)) {
throw new IllegalActionException(this, "integer is out of range.");
}
bits[0] = new BooleanToken(false);
}
for (int i = rate - 1; i > 0; i--) {
int remainder = integer % 2;
integer = integer / 2;
if (remainder == 0) {
bits[i] = new BooleanToken(false);
} else {
bits[i] = new BooleanToken(true);
}
}
output.send(0, bits, bits.length);
}