Statics in the engine

[Christopher Yates <CA...@co.stark.oh.us>]

Hello,
 
Page 416 of TIA says a subclassed Engine object is a great place to put
common utility methods.  Well, I have a date format that is a standard
for the whole application and will be used in several places.  So I put
the following in an Engine object:
 
public static final SimpleDateFormat DATE_FORMAT = new
SimpleDateFormat("M/d/yyyy");
 
However, when I try to use:
 
ognl:@engine@DATE_FORMAT
 
it results in a class not found exception.
 
ognl:engine@DATE_FORMAT
 
results in malformed OGNL expression
 
Is what I'm trying to do possible?  Any suggestions?  
 
Even when I try public SimpleDateFormat getDateFormat() { return
DATE_FORMAT; } and ognl:engine.dateFormat I get a No Such Property
Exception.  I checked the inspector and verified the engine class is set
to my engine and not BaseEngine.
 
Thanks.
 
-
Chris Yates
Stark County Information Technology
330-451-7432 x4405

Re: Statics in the engine

[Paul Ferraro <pm...@columbia.edu>]

You should keep in mind that the java.text.SimpleDateFormat object is 
not thread-safe and should not be used as a static field in this way.
To answer your question, you need to use the full class name of your 
engine class to reference a static field via ognl.
http://www.ognl.org/2.6.7/Documentation/html/LanguageGuide/staticFields.html

Paul

Christopher Yates wrote:

>Hello,
> 
>Page 416 of TIA says a subclassed Engine object is a great place to put
>common utility methods.  Well, I have a date format that is a standard
>for the whole application and will be used in several places.  So I put
>the following in an Engine object:
> 
>public static final SimpleDateFormat DATE_FORMAT = new
>SimpleDateFormat("M/d/yyyy");
> 
>However, when I try to use:
> 
>ognl:@engine@DATE_FORMAT
> 
>it results in a class not found exception.
> 
>ognl:engine@DATE_FORMAT
> 
>results in malformed OGNL expression
> 
>Is what I'm trying to do possible?  Any suggestions?  
> 
>Even when I try public SimpleDateFormat getDateFormat() { return
>DATE_FORMAT; } and ognl:engine.dateFormat I get a No Such Property
>Exception.  I checked the inspector and verified the engine class is set
>to my engine and not BaseEngine.
> 
>Thanks.
> 
>-
>Chris Yates
>Stark County Information Technology
>330-451-7432 x4405
>
>  
>


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Re: Statics in the engine

[Danny Mandel <dm...@tolweb.org>]

To access a static method or var you need to use the full classname syntax.

So if your engine is named com.foo.Engine you need this:

ognl:@com.foo.Engine@DATE_FORMAT

I'm using things like this throughout my app so it is definitely possible.

Danny

Christopher Yates wrote:

>Hello,
> 
>Page 416 of TIA says a subclassed Engine object is a great place to put
>common utility methods.  Well, I have a date format that is a standard
>for the whole application and will be used in several places.  So I put
>the following in an Engine object:
> 
>public static final SimpleDateFormat DATE_FORMAT = new
>SimpleDateFormat("M/d/yyyy");
> 
>However, when I try to use:
> 
>ognl:@engine@DATE_FORMAT
> 
>it results in a class not found exception.
> 
>ognl:engine@DATE_FORMAT
> 
>results in malformed OGNL expression
> 
>Is what I'm trying to do possible?  Any suggestions?  
> 
>Even when I try public SimpleDateFormat getDateFormat() { return
>DATE_FORMAT; } and ognl:engine.dateFormat I get a No Such Property
>Exception.  I checked the inspector and verified the engine class is set
>to my engine and not BaseEngine.
> 
>Thanks.
> 
>-
>Chris Yates
>Stark County Information Technology
>330-451-7432 x4405
>
>  
>


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