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Posted to issues@commons.apache.org by "Henri Yandell (JIRA)" <ji...@apache.org> on 2009/07/12 22:11:14 UTC
[jira] Commented: (COLLECTIONS-329) Sorting the collection based on
bean property in "CollectionUtils"
[ https://issues.apache.org/jira/browse/COLLECTIONS-329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12730137#action_12730137 ]
Henri Yandell commented on COLLECTIONS-329:
-------------------------------------------
Have a look at http://commons.apache.org/beanutils/bean-collections/index.html - it conains a BeanComparator. It's a 'join' package in that it contains the overlap of BeanUtils and Collections.
Possibly I'm not understanding the enhancement request :)
> Sorting the collection based on bean property in "CollectionUtils"
> ------------------------------------------------------------------
>
> Key: COLLECTIONS-329
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-329
> Project: Commons Collections
> Issue Type: New Feature
> Components: Collection, Comparator
> Affects Versions: 3.2
> Environment: JDK 1.5 and above , Apache Collections
> Reporter: Ganesh Gowtham
> Priority: Minor
>
> Hi Folks ,
> Thanks for your good work done in Collection Framework .
> It would be good if you add functionality to sort the collection based on bean's property name . ( CollectionsUtils,java)
> For example i have List<Person> , i should be able to sort (ascending or desending ) based on person's salary (or) firstName (or) lastName (or) may be the combination of above
> below is the equivalent in SQL
> (select * from person order by salary,firtsName,lastName asc )
> method looks like
> public static <T> void sort(List<T> list, boolean isAscending,String... beanPropertyName) {
> Collection<Comparator<T>> beanComparatorCollection = new ArrayList<Comparator<T>>(beanPropertyName.length);
> for(int i =0;i<beanPropertyName.length;i++)
> {
> beanComparatorCollection.add(new BeanComparator(beanPropertyName[i]));
> }
> Comparator<T> finalComparator = ComparatorUtils.chainedComparator(beanComparatorCollection);
> if (!isAscending) {
> finalComparator = new ReverseComparator(finalComparator);
> }
> Collections.sort(list, finalComparator);
> }
> Please let me know if you need any details , infact i able to submit patch too .
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