Re: In VTL, simply reverse a list with java.util.Collection static method

On 05/06/2013 03:15 PM, Travis P wrote:
> Via web searching, I've found quite a few people reversing lists by writing
> out loops.
> 
> Seems to me, we should be able to something like:
> 
> #set ($lst = ["a","b","c"])
> #set ($revlst = $lst)
> $Collection.reverse($revlst)
> 
> where $Collection.reverse refers to the java.util.Collections static method
> static void*reverse<http://w3.hursley.ibm.com/java/docs/jdk5.0/api/java/util/Collections.html#reverse(java.util.List)>
> *(List <http://w3.hursley.ibm.com/java/docs/jdk5.0/api/java/util/List.html>
> <?> list)
>           Reverses the order of the elements in the specified list.
> 
> but I don't see any way to do that without writing a custom tool.  Which
> seems heavy-handed for such a basic thing.  Am I missing something?
> 
> (I'm using velocity-1.7, velocity-tools-view-2.0, running on tomcat-7.0.39)
> 
> -Travis
> 

You should use the existing SortTool tool.

http://velocity.apache.org/tools/devel/javadoc/org/apache/velocity/tools/generic/SortTool.html

For security reasons, Velocity doesn't allow accessing raw classes or
instantiating new objects. You must always start from a valid variable
placed in the context.

See http://velocity.apache.org/tools/releases/2.0/ for more details
about tools and how to configure them.