Re: Howto create a VECTOR for Velocity

[Travis Stevens]

It would have compiled, but it would have thrown a null pointer exception during runtime.
-T

Shashidhar Bhattaram wrote:

how did this code even compile? where have you initialized Vector B??

-----Original Message-----
From: Eigen Technology Pty Ltd [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, December 31, 2002 1:49 PM
To: [EMAIL PROTECTED]
Subject: RE: Howto create a VECTOR for Velocity


Is this Legal?

Vector A = (some Vector from the Database);
Vector B = null;

for (i=0; i < A.size(); ++i) {
B.add(A.elementAt(i));
}

I am expecting the contents in A will be the same as B after the for loop.
But:

context.put("entries", B);

returns nothing and this time there is no error log. Anything wrong there?

thanks
michael

I dont see why that should be an issue as the context uses a Hashmap to
store the values... It ideally should have just replaced the entry,
unless the wrapper (VelocityContext) is performing some checks... have
you taken a look at the code?

-----Original Message-----
From: Colin Chalmers [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, December 31, 2002 12:26 PM
To: Turbine Users List; [EMAIL PROTECTED]
Subject: Re: Howto create a VECTOR for Velocity


The only thing that I can see, and that's probably more to do with your
example, is that you use "entry" twice.

Do you have logs/stacktraces we could look at?

/c

----- Original Message -----
From: "Eigen Technology Pty Ltd" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, December 31, 2002 7:30 AM
Subject: Re: Howto create a VECTOR for Velocity

Well, the reason I raised the question was because I tried and failed
using arrays, lists etc when passon to Velocity, i.e.

context.put("entry", some_list/some_array);
have FAILED.

This is what I did:

1. I have a Vector A; <------ context.put("entry", A) is OK with

Velocity.

2. But I need to do some work on the data in A. So:
3. Extract Object a = A.elementAt(some_position); Do what I have to do

AND:

4. Put it back into another Vector B.
B.add(modified_a);
context.put("entry", B);

BUT velocity does not like it.

I tried to vary Vector B with Array B, List B, nothing worked, anyone
know where I have done wrong?

cheers
michael

or you could probably use an array of an array directly.

On Monday, December 30, 2002, at 04:24 PM, Scott Eade wrote:

Michael,

Most people on this list will argue strongly that your velocity

templates

should contain only formatting code and never processing code - put

this

instead in a pull tool or the screen classes.

Provide a method in your pull tool that provides the data you need

- this

might instantiate and populate a Vector or whatever else you want

to do.

I don't really understand the specific example you are attempting

to describe below, but an object is an object, whether it is
created by Turbine, Torque, your pull tool or screen class - and
Velocity should

be
able to access it and work with it provided that you have somehow

made

it
available to the context.

One thing you can't do in velocity (and shouldn't be able to do) is

instantiate non-primitives (other than String). You can create
references

to objects, arrays, Strings and ints using #set.

BTW: You may like to use ArrayList in preference to Vector.

HTH,

Scott
--
Scott Eade
Backstage Technologies Pty. Ltd.
http://www.backstagetech.com.au
.Mac Chat/AIM: seade at mac dot com


On 31/12/2002 10:56 AM, "Eigen Technology Pty Ltd"
<[EMAIL PROTECTED]> wrote:

Thanks for the advice,

I knew the Pull Tool part. But my question was on how to create a

Vector

in this PullTool.

Say you have 100 rows of data each with 6 cols in your

$DateTool.TodaysDate()

function. Before you pass it to Velocity, you have to package them

in

a
Vector first, right (correct me if I am wrong)? If this vector is

not

from
Turbine, how do you create it?

cheers
michael

you have to configure your TR.properties file. Configure the pull

service by adding a line like

services.PullService.tool.<scope>.<id> = <classname>

for example:

services.PullService.tool.request.date=com.clavie.myEvents.tool.DateT
ool

then, you should be able to access it in Velocity with sth like:

$DateTool.TodaysDate()

David

On Monday, December 30, 2002, at 03:37 PM, Eigen Technology Pty

Ltd wrote:

When Turbine extract data from a database, it creates a Vector

and returns

for Velocity to display.

If I want to write a Java Utility, some tabulated calculated

results are

to be passed on to Velocity, i.e. Vectors not created by

Turbine, how

should I do it.

I tried:

Vector TEST=null;

etc....

for(i=0; i < somelimit; ++i) {
TEST.add(someobject(i));
}
etc....

return TEST;

Velocity displays nothing, help is much appreciated.

michael




--
To unsubscribe, e-mail:
<mailto:[EMAIL PROTECTED]>
For additional commands, e-mail:
<mailto:[EMAIL PROTECTED]>

--
To unsubscribe, e-mail:
<mailto:[EMAIL PROTECTED]> For

additional commands, e-mail:
<mailto:[EMAIL PROTECTED]>

--
To unsubscribe, e-mail:
<mailto:[EMAIL PROTECTED]>
For additional commands, e-mail:
<mailto:[EMAIL PROTECTED]>

--
To unsubscribe, e-mail:
<mailto:[EMAIL PROTECTED]>
For additional commands, e-mail:
<mailto:[EMAIL PROTECTED]>

--
To unsubscribe, e-mail:
<mailto:[EMAIL PROTECTED]> For additional

commands, e-mail: <mailto:[EMAIL PROTECTED]>




--
To unsubscribe, e-mail:

<mailto:[EMAIL PROTECTED]>

For additional commands, e-mail:

<mailto:[EMAIL PROTECTED]>

--
To unsubscribe, e-mail:
<mailto:[EMAIL PROTECTED]> For additional
commands, e-mail: <mailto:[EMAIL PROTECTED]>


--
To unsubscribe, e-mail:
<mailto:[EMAIL PROTECTED]> For additional
commands, e-mail: <mailto:[EMAIL PROTECTED]>

--
To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]>
For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>


--
To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]>
For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>