Fixed... but I think this stinks :)
public final Double getXMin(){
return isXMinNull() ? null : getXMinValue();
}
private final native boolean isXMinNull()/*-{
return this.xmin == null;
}-*/;
private final native double getXMinValue()/*-{
return this.xmin;
}-*/;
On Tue, Aug 3, 2010 at 11:50 AM, Andrew Hughes <[email protected]> wrote:
> Thank's again André :)
>
> I've made some progress..... you'r suggestion to use Integer and not
> primitive int was bang on the mark! :) Unfornately autoboxing was masking
> some of my problems - but now I have learnt the error's of my ways :)
>
> Now I am happily using Integer with and without null values...
>
> public final native Integer getCode()/*-{
> return this.code;
> }-*/;
>
>
> HOWEVER, Double && double won't work. Double works with null but not a
> valid javascript Number... and vice-a-vera with double. I've looked at all
> the documentation... going crazy to tell you the truth over such a small
> simple issue.. but your helps been great THANK YOU! :)
>
> --AH
>
>
>
> 2010/8/3 André Moraes <[email protected]>
>
> 1) This HostedModeException is very annoying. Null (or in JavaScript
>>> terms 'undefined') is a valid value for my JavaScript/JSON attributes. I
>>> want a way where if the darn thing is undefined return null... don't throw
>>> a HostedModeException - I also tried in jsni if(this.attribute){ return
>>> this.attribute; } else { return undefined } but the exception is still
>>> thrown.
>>>
>>
>> in your Jsni instead of
>>
>> if (this.attribute) { return this.attribute; } else { return undefined; }
>>
>> try
>>
>> if (this.attribute) { return this.attribute; } else { return null; }
>>
>> In javascript, null and undefined are two differente things. When
>> something is null, this means that an variable is defined and its value is
>> null; If something is undefined that means there is no variable with that
>> name.
>>
>> the statment: "if (this.attribute)" works because when in a boolean
>> context, undefined is evaluated to false. Just like C where 0 is false and
>> everything else is true.
>>
>> To solve the int problem, try to change the return type to "Object" and
>> then check if the returned value is null. There is no way to return "null"
>> in java if the return type of a method is a "primitive int";
>>
>> I belive that since you are returning null from JSNI, the HostedMode will
>> be smart enough to cast "javascript null" to "java null". :)
>>
>>
>>> 2) There is no documentation about how this will behave in production?
>>> Will it just return null? I don't know how I can ensure consistency between
>>> dev and production modes :'(
>>>
>>
>> In production mode the javascript rules applies, so this probably will
>> trigger an error in your browser. When using JSNI method is necessary to
>> think in two different worlds (java and javascript). Check this link, maybe
>> will help with the javascript type system:
>> http://www.java2s.com/Tutorial/JavaScript/0100__Number-Data-Type/PrimitiveTypes.htm
>>
>>
>> Hope it helps.
>> --
>> André Moraes
>> Analista de Desenvolvimento de Sistemas
>> [email protected]
>> http://andredevchannel.blogspot.com/
>>
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>
>
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