[COLLECTIONS-436] Add a method that returns an empty collection if a passed in collection is null

• Type: Wish
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 4.0-alpha1, 4.0
• Component/s: Collection
• Assignee: Unassigned
• Reporter: Arman Sharif
• Created: 12/Dec/12 23:33
• Updated: 09/Nov/14 14:31
• Resolved: 13/Dec/12 21:54

Description

Would it be possible to add methods to CollectionUtils that return an empty collection if given a null? e.g.

    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;
    }