Posted by
Michael Doube on
Nov 25, 2010; 11:18am
URL: http://imagej.273.s1.nabble.com/String-representation-of-Double-POSITIVE-INFINITY-tp3686354.html
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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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