Conditional binding fails with fracture from scratch using the fluent API

I have two properties that I want to connect to a progress bar. Properties represent essentially a max value of County (the denominator) and current value of the Shire (numerator). I want to set up a connection using the fluent API that works roughly as follows:
IntegerProperty numerator = new SimpleIntegerProperty(0);
IntegerProperty denominator = new SimpleIntegerProperty(0);

progressBar.progressProperty().bind(
    Bindings.when(denominator.isEqualTo(0))
        .then(0)
        .otherwise(numerator.divide(denominator)));
The numerator and denominator properties represent two properties in my object that changes according to certain criteria in the application, and I want the progress bar to be bound by these changes. The problem is sometimes, and by default, the value of the denominator is 0. My logic tells me that the clause otherwise() does not run, because the when() condition must be true and so run the then() clause. When I run the above code, I get an ArithmeticException (/ by zero).

Question - is this the correct behavior of the code underlying link? I don't understand why the otherwise() clause is being evaluated in this case.
Can I suggest an improvement to short-circuit the logic to avoid such a situation?

My solution is to create a custom as follows DoubleBinding:
IntegerProperty numerator = new SimpleIntegerProperty(0);
IntegerProperty denominator = new SimpleIntegerProperty(0);

DoubleBinding db = new DoubleBinding() {
    { super.bind(numerator, denominator); }
 
    @Override
    protected double computeValue() {
        if(denominator.getValue() == 0) {
            return 0.0;
        }
        return numerator.doubleValue() / denominator.doubleValue();
    }
};
        
progressBar.progressProperty().bind(db);
I would much rather the fluent API (much less code to write and much more elegant), but I'm glad that the custom binding is not too difficult to write and understand.

Thanks for all comments or impressions.

I have not tested, but for a workaround, you can try

progressBar.progressProperty().bind(
    Bindings.when(denominator.isEqualTo(0))
        .then(0)
        .otherwise(numerator.divide(denominator.doubleValue())));

This will force (should) the division must be calculated using double rather than the integers (ints); x / 0,0 will assess double. NaN in java, without throwing an exception. Note that this calculation will give slightly different results in other cases, such as the division of integers you used before will still result in an int (by truncation); considering that it will give a double precision division. In most cases, the latter will actually be what you want.

Tags: Java

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