text output page header

[Petermair Patrick <Pa...@anecon.com>]

Hi!

We are using Velocity to create some reports that will be printed out. One
report gets a list of customers and prints some data about them. I¹m now
faced with the problem of writing a page header at the beginning of every
page (that gets printed out). Something like:

³Page 23²

and so on... Is there any support in Velocity to print some kind of header
after a fixed amount of lines? I know how many lines a page can hold. The
data per customer isn¹t static so I don¹t know how many lines each customer
will take. So basically my textfile would look like this:

Page 1
<some data>
<more data>
Page 2
<some more data>
Page 3
<even more data>
<still more data>
<more more data>
Page 4
...

Without the header I would simply output every customer in a ³for each²
loop. But I need to tell Velocity somehow that it needs to print an extra
line with some header data after every 80th line (for example).

I was going through the documentation but I couldn¹t find anything that
would help me do this ... any ideas?

Thanks,
Patrick

Re: text output page header

[ap...@recks.org]

Hi,

to my knowledge, neither the Velocity-engine nor the Template currently have capabilities to count lines and do something ever x-lines. But you could device some workarounds.

a) Pass all lines through a macro that counts the lines and inserts the header information. (untested code)
   #set( $pageNr = 1 )
   #set( $lineNr = 0 )
   #macro( println $text )
     #if( $lineNr % 80 )
       Page $pageNr
       #set( $pageNr= $pageNr+ 1 )
     #end
     ## emit the text
     $text
     #set( $lineNr = $lineNr + 1 )
     ## or do something more sophisticated to count the lines...
   #end
   ...
   ## use the macro
   #println("some data")
   #println("more data")
   ...

b) Use a custom Writer class passed to the velocity rendering which does the line handling.

c) Use velocity to generate FOP content post-rendered to pages

I would do b) or c).

Just 2cents of ideas...
Christoph

Petermair Patrick wrote:
> Hi!
> 
> We are using Velocity to create some reports that will be printed out. One
> report gets a list of customers and prints some data about them. I¹m now
> faced with the problem of writing a page header at the beginning of every
> page (that gets printed out). Something like:
> 
> ³Page 23²
> 
> and so on... Is there any support in Velocity to print some kind of header
> after a fixed amount of lines? I know how many lines a page can hold. The
> data per customer isn¹t static so I don¹t know how many lines each customer
> will take. So basically my textfile would look like this:
> 
> Page 1
> <some data>
> <more data>
> Page 2
> <some more data>
> Page 3
> <even more data>
> <still more data>
> <more more data>
> Page 4
> ...
> 
> Without the header I would simply output every customer in a ³for each²
> loop. But I need to tell Velocity somehow that it needs to print an extra
> line with some header data after every 80th line (for example).
> 
> I was going through the documentation but I couldn¹t find anything that
> would help me do this ... any ideas?
> 
> Thanks,
> Patrick
> 
> 

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Re: text output page header

[Claude Brisson <cl...@renegat.net>]

You can use a custom buffered writer that would count output lines and
insert the appropriate headers.


  Claude

On lun., 2009-06-22 at 17:41 +0200, Petermair Patrick wrote:
> Hi!
> 
> We are using Velocity to create some reports that will be printed out. One
> report gets a list of customers and prints some data about them. I¹m now
> faced with the problem of writing a page header at the beginning of every
> page (that gets printed out). Something like:
> 
> ³Page 23²
> 
> and so on... Is there any support in Velocity to print some kind of header
> after a fixed amount of lines? I know how many lines a page can hold. The
> data per customer isn¹t static so I don¹t know how many lines each customer
> will take. So basically my textfile would look like this:
> 
> Page 1
> <some data>
> <more data>
> Page 2
> <some more data>
> Page 3
> <even more data>
> <still more data>
> <more more data>
> Page 4
> ...
> 
> Without the header I would simply output every customer in a ³for each²
> loop. But I need to tell Velocity somehow that it needs to print an extra
> line with some header data after every 80th line (for example).
> 
> I was going through the documentation but I couldn¹t find anything that
> would help me do this ... any ideas?
> 
> Thanks,
> Patrick
> 


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