[BEANUTILS-352] Sorting the collection based on bean property in "CollectionUtils"

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Fix Version/s: 2.0.0-M2
• Component/s: Bean-Collections

Environment

JDK 1.5 and above , Apache Collections

• Assignee: Unassigned
• Reporter: Ganesh Gowtham
• Created: 13/Jun/09 13:35
• Updated: 2 days ago 14:06

Description

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 .