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=collectionstool&xpage=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
