You could pick a value which won't occur otherwise.
For instance, Float has a special value Float.NaN, which is not a
number. (If you use this, remember that the equals test doesn't work on
this.)
Integers don't have any such value, but some codes use
Integer.MIN_VALUE, if it won't occur otherwise.
Finally, you could define another feature in your FeatureStructure, of
type boolean, and set that to false initially, and true when you set the
feature of interest.
-Marshall
On 5/3/2010 10:02 AM, Thilo Goetz wrote:
> On 5/3/2010 15:15, Klaus Rothenhäusler wrote:
>
>> Hi,
>> is there any way to determine whether a feature of a primitive
>> numerical type has been set in a particular feature structure? The
>> methods like getIntValue(feat), getFloatValue(feat), etc. all return a
>> zero value if the feature hasn't been set. But zero is of course a
>> perfectly plausible value in many domains.
>>
>> Thanks
>> --Klaus Rothenhäusler
>>
> There is no way to check this. We do not wrap primitive
> values internally, and so do not attach any metadata like,
> has it been set or not. It's like a Java primitive variable
> in that sense.
>
> --Thilo
>
>
>
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