@Override
public void attributeChanged(final Attribute attribute) throws IllegalActionException {
try {
if (attribute == function) {
final String functionName = function.stringValue();
if (functionName.equals("exp")) {
_function = _EXP;
if (secondOperand != null) {
secondOperand.setContainer(null);
}
} else if (functionName.equals("log")) {
_function = _LOG;
if (secondOperand != null) {
secondOperand.setContainer(null);
}
} else if (functionName.equals("modulo")) {
_function = _MODULO;
_createSecondPort();
} else if (functionName.equals("sign")) {
_function = _SIGN;
if (secondOperand != null) {
secondOperand.setContainer(null);
}
} else if (functionName.equals("square")) {
_function = _SQUARE;
if (secondOperand != null) {
secondOperand.setContainer(null);
}
} else if (functionName.equals("sqrt")) {
_function = _SQRT;
if (secondOperand != null) {
secondOperand.setContainer(null);
}
} else {
throw new IllegalActionException(this, "Unrecognized math function: " + functionName);
}
} else {
super.attributeChanged(attribute);
}
} catch (final NameDuplicationException nameDuplication) {
throw new InternalErrorException(this, nameDuplication, "Unexpected name duplication");
}
}
/** Create the second port needed by modulo function */
private void _createSecondPort() throws NameDuplicationException, IllegalActionException {
// Go looking for the port in case somebody else created the port
// already. For example, this might
// happen in shallow code generation.
secondOperand = (Port) getPort("secondOperand");
if (secondOperand == null) {
secondOperand =
PortFactory.getInstance().createInputPort(this, "secondOperand", Double.class);
} else if (secondOperand.getContainer() == null) {
secondOperand.setContainer(this);
}
}