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https://issues.apache.org/jira/browse/BEANUTILS-352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12739900#action_12739900
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Ganesh Gowtham commented on BEANUTILS-352:
------------------------------------------
Dear Niall Pemberton ,
Thanks for your reply .
infact i have idea to add some more functionalities
i am ready with patch code with junit , Please let me know if can able to
contribute for Fix Version/s: LATER THAN 1.8.1
//Picks the highest element from collection of valueObjects based
//on the beanAttribute .
1) public static <T> T min(Collection<T> list, String beanPropertyName)
{
...
}
//Picks the lowest element from collection of valueObjects based
//on the beanAttribute .
2) public static <T> T min(Collection<T> list, String beanPropertyName)
{
...
}
// Selects the object from collection based on beanProperty and value
// like select * from Person where name='Ganesh Gowtham' ( i will get the
Person Object)
3 ) public static <T> T selectObjectFromCollection(Collection<T> list,
String beanPropertyName, Object value)
{
...
}
// Selects the Collection of objects from main collection
// like select * from Person where salary = 3000 --> returns the List<Person>
with salary = 3000
4 ) public static <T> Collection<T> selectFromList(Collection<T> list,
String beanPropertyName, Object value)
{
...
}
// higher version of (4) where in (5) will take array of attrbute names and
array of values
5) public static <T> Collection<T> selectFromList(Collection<T> list,
String[] beanPropertyName, Object[] value)
{
...
}
Thanks for your Good Work .
Gowtham
8 http://ganesh.gowtham.googlepages.com
From: Niall Pemberton (JIRA)
Sent: Tue 8/4/2009 9:10 PM
To: [email protected]
Subject: [jira] Updated: (BEANUTILS-352) Sorting the collection based on bean
property in "CollectionUtils"
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https://issues.apache.org/jira/browse/BEANUTILS-352?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Niall Pemberton updated BEANUTILS-352:
--------------------------------------
Fix Version/s: LATER THAN 1.8.1
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> Sorting the collection based on bean property in "CollectionUtils"
> ------------------------------------------------------------------
>
> Key: BEANUTILS-352
> URL: https://issues.apache.org/jira/browse/BEANUTILS-352
> Project: Commons BeanUtils
> Issue Type: Improvement
> Components: Bean-Collections
> Environment: JDK 1.5 and above , Apache Collections
> Reporter: Ganesh Gowtham
> Priority: Minor
> Fix For: LATER THAN 1.8.1
>
>
> 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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