In CollectionUtils.getCardinalityMap the documentation notes the meaning of an entry
that maps to null but I don't see how any such entry can exist in the returned map as
all the keys in the map come from the collection parameter and will map to >=1. Have I
missed something?
>From CollectionUtils v 1.36
/**
* Returns a [EMAIL PROTECTED] Map} mapping each unique element in
* the given [EMAIL PROTECTED] Collection} to an [EMAIL PROTECTED] Integer}
* representing the number of occurences of that element
* in the [EMAIL PROTECTED] Collection}.
* An entry that maps to <tt>null</tt> indicates that the
* element does not appear in the given [EMAIL PROTECTED] Collection}.
*/
public static Map getCardinalityMap(final Collection col) {
HashMap count = new HashMap();
Iterator it = col.iterator();
while(it.hasNext()) {
Object obj = it.next();
Integer c = (Integer)(count.get(obj));
if(null == c) {
count.put(obj,new Integer(1));
} else {
count.put(obj,new Integer(c.intValue() + 1));
}
}
return count;
}
-Janek
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