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Posted to user@velocity.apache.org by Christofer 'boz' Jennings <bo...@cox.net> on 2005/03/18 16:06:50 UTC
reading an array's length?
I want to get an array's length wit VTL, but $mayArray.length doesn't
work. How s it done?
Thanks!
,boz
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Re: reading an array's length?
Posted by Shinobu Kawai <sh...@gmail.com>.
Hi Jian,
> I also used Array Tool before. However, looking at the source of it,
> it appears to me that every time you call a method of the Array tool,
> it creates a new instance of the array list internally, which is mild
> performance problem.
The current version uses reflection, so shouldn't be so much of an overhead. :)
Best regards,
-- Shinobu
--
Shinobu Kawai <sh...@gmail.com>
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Re: reading an array's length?
Posted by jian chen <ch...@gmail.com>.
Hi,
I also used Array Tool before. However, looking at the source of it,
it appears to me that every time you call a method of the Array tool,
it creates a new instance of the array list internally, which is mild
performance problem.
So, now I tried to avoid using it. What I did is to use standard java
Arrays conversion to convert array to a list and then pass it to into
the template.
Just my 2 cents.
Cheers,
Jian
On Fri, 18 Mar 2005 11:07:30 -0500, Mike Kienenberger
<mk...@alaska.net> wrote:
> Christofer 'boz' Jennings <bo...@cox.net> wrote:
> > Is there a binary for ArrayTool somewhere or do I just build it?
> >
> > And how would it get configured programmatically (eg.
> > velocity.setProperty())?
>
> It's included with the latest (cvs) Velocity tools, I think.
>
> It's also available on the Velocity Wiki.
>
> http://wiki.apache.org/jakarta-velocity/ArrayTool
>
> It's easy enough to just add it to your project as another java file (that's
> what I'd do).
>
> To use it, either configure it via toolbox.xml (if you're using that) or
> just do a velocityContext.put("arrayTool", new ArrayTool());
>
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>
>
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Re: reading an array's length?
Posted by Shinobu Kawai <sh...@gmail.com>.
Hi Mike,
> > Is there a binary for ArrayTool somewhere or do I just build it?
> It's included with the latest (cvs) Velocity tools, I think.
Not yet. I'm going to get the List support back first.
## svn, BTW ;)
Best regards,
-- Shinobu
--
Shinobu Kawai <sh...@gmail.com>
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Re: reading an array's length?
Posted by Christofer Boz Jennings <bo...@cox.net>.
And its nice to use something that makes me say "ahh" instead of
"argh!" .... :-)
,boz
On Mar 18, 2005, at 6:09 PM, Mike Kienenberger wrote:
> Christofer 'boz' Jennings <bo...@cox.net> wrote:
>> Ahh. Now I get tools.... So simple :-)
>
> Yeah, that's exactly how I felt. It just took me a lot longer to
> figure it
> out.
>
> Wonderfully brilliant yet simple idea once you realize that there's
> nothing
> special about a tool. :)
>
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Re: reading an array's length?
Posted by Mike Kienenberger <mk...@alaska.net>.
Christofer 'boz' Jennings <bo...@cox.net> wrote:
> Ahh. Now I get tools.... So simple :-)
Yeah, that's exactly how I felt. It just took me a lot longer to figure it
out.
Wonderfully brilliant yet simple idea once you realize that there's nothing
special about a tool. :)
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Re: reading an array's length?
Posted by Christofer 'boz' Jennings <bo...@cox.net>.
Ahh. Now I get tools.... So simple :-)
Dummied the ArrayTool down to just what I need. Later it can be swapped
for the real thing I guess. Herre's what I did....
//----------------------------- start snip
package mystuff;
import java.lang.reflect.Array;
public class VelocityArrayTool
{
/**
* Default constructor.
*/
public VelocityArrayTool()
{
}
public Integer length(Object array)
{
int length;
try {
length = Array.getLength(array);
}
catch (Exception e) {
return null;
}
return new Integer(length);
}
}
//----------------------------- end snip
then added it to the context as you suggested.
Thanks for all the help!
,boz
On Mar 18, 2005, at 8:07 AM, Mike Kienenberger wrote:
> Christofer 'boz' Jennings <bo...@cox.net> wrote:
>> Is there a binary for ArrayTool somewhere or do I just build it?
>>
>> And how would it get configured programmatically (eg.
>> velocity.setProperty())?
>
> It's included with the latest (cvs) Velocity tools, I think.
>
> It's also available on the Velocity Wiki.
>
> http://wiki.apache.org/jakarta-velocity/ArrayTool
>
> It's easy enough to just add it to your project as another java file
> (that's
> what I'd do).
>
> To use it, either configure it via toolbox.xml (if you're using that)
> or
> just do a velocityContext.put("arrayTool", new ArrayTool());
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: velocity-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: velocity-user-help@jakarta.apache.org
>
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Re: reading an array's length?
Posted by Mike Kienenberger <mk...@alaska.net>.
Christofer 'boz' Jennings <bo...@cox.net> wrote:
> Is there a binary for ArrayTool somewhere or do I just build it?
>
> And how would it get configured programmatically (eg.
> velocity.setProperty())?
It's included with the latest (cvs) Velocity tools, I think.
It's also available on the Velocity Wiki.
http://wiki.apache.org/jakarta-velocity/ArrayTool
It's easy enough to just add it to your project as another java file (that's
what I'd do).
To use it, either configure it via toolbox.xml (if you're using that) or
just do a velocityContext.put("arrayTool", new ArrayTool());
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Re: reading an array's length?
Posted by Christofer 'boz' Jennings <bo...@cox.net>.
Thanks Steve!
Is there a binary for ArrayTool somewhere or do I just build it?
And how would it get configured programmatically (eg.
velocity.setProperty())?
???
,boz
On Mar 18, 2005, at 7:41 AM, Steve O'Hara wrote:
>
> Velocity isn't too great at referencing arrays but there is a tool to
> help
> here;
>
> http://wiki.apache.org/jakarta-velocity/ArrayTool
>
> Steve
>
> -----Original Message-----
> From: Christofer 'boz' Jennings [mailto:boz@cox.net]
> Sent: 18 March 2005 15:07
> To: velocity-user@jakarta.apache.org
> Subject: reading an array's length?
>
>
> I want to get an array's length wit VTL, but $mayArray.length doesn't
> work. How s it done?
>
> Thanks!
> ,boz
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: velocity-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: velocity-user-help@jakarta.apache.org
>
>
>
>
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>
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RE: reading an array's length?
Posted by Steve O'Hara <so...@pivotal-solutions.co.uk>.
Velocity isn't too great at referencing arrays but there is a tool to help
here;
http://wiki.apache.org/jakarta-velocity/ArrayTool
Steve
-----Original Message-----
From: Christofer 'boz' Jennings [mailto:boz@cox.net]
Sent: 18 March 2005 15:07
To: velocity-user@jakarta.apache.org
Subject: reading an array's length?
I want to get an array's length wit VTL, but $mayArray.length doesn't
work. How s it done?
Thanks!
,boz
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