[jira] Created: (COLLECTIONS-329) Sorting the collection based on bean property in "CollectionUtils"

[Ganesh Gowtham (JIRA)]

Sorting the collection based on bean property in "CollectionUtils"
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                 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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