On 05/25/2013 11:59 AM, ricardo.julio.rodriguez.fernan...@sergas.es wrote:
From: Sergiu Dumitriu [sergiu.dumit...@gmail.com]
Sent: 25 May 2013 17:49
To: Velocity Users List
Subject: Re: On sorting
On 05/25/2013 11:39 AM, ricardo.julio.rodriguez.fernan...@sergas.es wrote:
I'm really getting mad! :-) Of course I know that the only reason for this
is my lack of skills!!! Catching up...
I do need some kind of security. Please, could you confirm this statement...
Class SortTool can be used to sort any list of objects, but NOT a list of
strings.
Where did you get this from? It is not true, it can sort any list of
comparable things:
#set ($strings = ['a', 'x', 'b', 'r', 'f'])
$sorttool.sort($strings) - [a, b, f, r, x]
Great! It is clear my wrong interpretation of this sentence...
SortTool allows a user to sort a collection (or array, iterator, etc) on any
arbitary set of properties exposed by the objects contained within the
collection.
It is taken from the link below. No reference to strings, it speaks only
about objects. But it is great to be wrong!
Yes, that is the more advanced part of the SortTool, the ability to sort
beans [1] by one or more of their properties. Unfortunately Strings
are not beans, so the sort methods that take a second parameter can't be
used for a simple list of strings.
[1] http://en.wikipedia.org/wiki/JavaBeans
And, in this case, how could I get a reverse/desc order?
It's not possible using the SortTool, but in XWiki we have the
$collectionstool [2, 3] which does provide both a simple sort(List) and
a reverse(List) method, so you could do:
#set ($discard = $collectionstool.sort($list))
#set ($discard = $collectionstool.reverse($list))
Keep in mind that these two methods sort the list in place, and they
return true if the list could be sorted/reversed.
[2]
https://github.com/xwiki/xwiki-commons/blob/xwiki-commons-5.0/xwiki-commons-core/xwiki-commons-velocity/src/main/java/org/xwiki/velocity/tools/CollectionsTool.java
[3]
http://platform.xwiki.org/xwiki/bin/view/SRD/Navigation?api=collectionstoolxpage=embed
Thanks!
http://velocity.apache.org/tools/devel/javadoc/org/apache/velocity/tools/generic/SortTool.html
Thanks!
-
To unsubscribe, e-mail: user-unsubscr...@velocity.apache.org
For additional commands, e-mail: user-h...@velocity.apache.org
