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From "Gary Gregory (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COLLECTIONS-436) Add a method that returns an empty collection if a passed in collection is null
Date Thu, 13 Dec 2012 17:22:14 GMT

    [ https://issues.apache.org/jira/browse/COLLECTIONS-436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13531210#comment-13531210
] 

Gary Gregory commented on COLLECTIONS-436:
------------------------------------------

Feel free to submit a patch with unit tests ;)

Gary
                
> Add a method that returns an empty collection if a passed in collection is null
> -------------------------------------------------------------------------------
>
>                 Key: COLLECTIONS-436
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-436
>             Project: Commons Collections
>          Issue Type: Wish
>          Components: Collection
>            Reporter: Arman Sharif
>            Priority: Minor
>
> Would it be possible to add methods to CollectionUtils that return an empty collection
if given a {{null}}? e.g.
> {code:java}
>     public static <T> List<T> emptyIfNull(List<T> list) {
>         return list == null ? Collections.<T>emptyList() : list;
>     }
>     public static <T> Set<T> emptyIfNull(Set<T> set) {
>         return set == null ? Collections.<T>emptySet() : set;
>     }
>     public static <K,V> Map<K,V> emptyIfNull(Map<K,V> map) {
>         return map == null ? Collections.<K,V>emptyMap() : map;
>     }
> {code}

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