String representation of Double.POSITIVE_INFINITY

[Michael Doube]

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Dear all,

I'm writing a small helper method to validate text input in a
GenericDialog.  My idea is to return false if something other than a
valid number is entered into a numeric field, so then the
dialogItemChanged method will also return false, which greys out the OK
button and prevents the plugin from running.  This was all very easy
until I tested a dialog that normally has a numeric field whose default
value is Double.POSITIVE_INFINITY.

This is represented by the '∞' character in the dialog, due to IJ.d2s:

<---
if (Double.isInfinite(n))
        return ""+n;
- --->

If I try to construct a Double("∞") or run parseDouble("∞") I get a
NumberFormatException.  Double(Double.POSITIVE_INFINITY).toString()
returns "Infinity".

It seems like GenericDialog handles this by looking the value up using
Interpreter, but I get lost about here.

At the moment, it looks like the most sensible thing to do is a
String.replace("∞", "Infinity") before using any of Double's methods.

Any suggestions on how to handle this better would be appreciated.

Michael



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[Rasband, Wayne (NIH/NIMH) [E]]

On Nov 25, 2010, at 6:18 AM, Michael Doube wrote:

> Dear all,
>
> I'm writing a small helper method to validate text input in a
> GenericDialog.  My idea is to return false if something other than a
> valid number is entered into a numeric field, so then the
> dialogItemChanged method will also return false, which greys out the OK
> button and prevents the plugin from running.  This was all very easy
> until I tested a dialog that normally has a numeric field whose default
> value is Double.POSITIVE_INFINITY.
>
> This is represented by the '∞' character in the dialog, due to IJ.d2s:
>
> <---
> if (Double.isInfinite(n))
> return ""+n;
> - --->
>
> If I try to construct a Double("∞") or run parseDouble("∞") I get a
> NumberFormatException.  Double(Double.POSITIVE_INFINITY).toString()
> returns "Infinity".
>
> It seems like GenericDialog handles this by looking the value up using
> Interpreter, but I get lost about here.
>
> At the moment, it looks like the most sensible thing to do is a
> String.replace("∞", "Infinity") before using any of Double's methods.
>
> Any suggestions on how to handle this better would be appreciated.
>
> Michael

This bug is fixed in the 1.44k16 daily build.

-wayne