Home » Modeling » Epsilon » Small query on using Native
| Small query on using Native [message #9278] |
Wed, 14 January 2009 10:55  |
 No real name
Messages: 92
Registered: July 2009 |
Member |
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Hia again,
I've found it very handy to create native Java objects using from Epsilon,
e.g., var x := new Native('javax.swing.JFrame'); . Out of interest, is it
possible to call static Java methods from Epsilon -- e.g., if you want a
java.util.Calendar object, you can use java.util.Calendar.getInstance();
and I'm not sure how to invoke this from Epsilon.
Also, I noticed that Native takes as parameter a String, e.g., new
Native('blah'). Is it possible to invoke Java constructors/methods that
accept as parameter existing Epsilon object references? E.g.,
var x : String := 'My JFrame Title';
var frame := new Native('javax.swing.JFrame', x); -- where x is passed as
the first parameter to the JFrame constructor.
(On a side note, I stumbled into the above ponderings when I was doing
some String manipulation in Epsilon, and was looking for an Epsilon String
operation (table 4.2 in the epsilon book) which found the length of a
String (I couldn't find this in the manual) -- instead I defined an ugly
implementation of it using the existing substring methods and charAt).
Thanks in advance,
Edd
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| Re: Small query on using Native [message #9302 is a reply to message #9278] |
Wed, 14 January 2009 11:35  |
Dimitrios Kolovos
Messages: 1776
Registered: July 2009 |
Senior Member |
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Hi Edd,
Please see comments below
Edward Turner wrote:
> Hia again,
>
> I've found it very handy to create native Java objects using from
> Epsilon, e.g., var x := new Native('javax.swing.JFrame'); . Out of
> interest, is it possible to call static Java methods from Epsilon --
> e.g., if you want a java.util.Calendar object, you can use
> java.util.Calendar.getInstance(); and I'm not sure how to invoke this
> from Epsilon.
This is not possible I'm afraid. A workaround is to create a util class
e.g. CalendarUtil and add a method that returns Calendar.getInstance().
>
> Also, I noticed that Native takes as parameter a String, e.g., new
> Native('blah'). Is it possible to invoke Java constructors/methods that
> accept as parameter existing Epsilon object references? E.g.,
> var x : String := 'My JFrame Title';
> var frame := new Native('javax.swing.JFrame', x); -- where x is passed
> as the first parameter to the JFrame constructor.
This is not possible either - but a similar workaround can be employed.
If you feel that any of those missing features is important, please feel
free to open an enhancement request in the bugzilla.
>
> (On a side note, I stumbled into the above ponderings when I was doing
> some String manipulation in Epsilon, and was looking for an Epsilon
> String operation (table 4.2 in the epsilon book) which found the length
> of a String (I couldn't find this in the manual) -- instead I defined an
> ugly implementation of it using the existing substring methods and charAt).
There is the length() operation which should be mentioned in the book -
but apparently was not. I've added it in page 34.
>
> Thanks in advance,
> Edd
>
Cheers,
Dimitris
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| Re: Small query on using Native [message #563906 is a reply to message #9278] |
Wed, 14 January 2009 11:35 |
Dimitrios Kolovos
Messages: 1776
Registered: July 2009 |
Senior Member |
|
|
Hi Edd,
Please see comments below
Edward Turner wrote:
> Hia again,
>
> I've found it very handy to create native Java objects using from
> Epsilon, e.g., var x := new Native('javax.swing.JFrame'); . Out of
> interest, is it possible to call static Java methods from Epsilon --
> e.g., if you want a java.util.Calendar object, you can use
> java.util.Calendar.getInstance(); and I'm not sure how to invoke this
> from Epsilon.
This is not possible I'm afraid. A workaround is to create a util class
e.g. CalendarUtil and add a method that returns Calendar.getInstance().
>
> Also, I noticed that Native takes as parameter a String, e.g., new
> Native('blah'). Is it possible to invoke Java constructors/methods that
> accept as parameter existing Epsilon object references? E.g.,
> var x : String := 'My JFrame Title';
> var frame := new Native('javax.swing.JFrame', x); -- where x is passed
> as the first parameter to the JFrame constructor.
This is not possible either - but a similar workaround can be employed.
If you feel that any of those missing features is important, please feel
free to open an enhancement request in the bugzilla.
>
> (On a side note, I stumbled into the above ponderings when I was doing
> some String manipulation in Epsilon, and was looking for an Epsilon
> String operation (table 4.2 in the epsilon book) which found the length
> of a String (I couldn't find this in the manual) -- instead I defined an
> ugly implementation of it using the existing substring methods and charAt).
There is the length() operation which should be mentioned in the book -
but apparently was not. I've added it in page 34.
>
> Thanks in advance,
> Edd
>
Cheers,
Dimitris
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