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From "Kurtis Williams (JIRA)" <j...@apache.org>
Subject [jira] Created: (COLLECTIONS-256) ListUtils.transformedList(list, transformer) doesn't transform
Date Fri, 08 Jun 2007 22:43:26 GMT
ListUtils.transformedList(list, transformer) doesn't transform
--------------------------------------------------------------

                 Key: COLLECTIONS-256
                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-256
             Project: Commons Collections
          Issue Type: Bug
          Components: List
    Affects Versions: 3.2
         Environment: Java 1.5
            Reporter: Kurtis Williams


The static method ListUtils.transformedList(List list, Transformer trans) does not apply the
transformer before returning the list.  I've traced into the code and it falls all the way
through to the TransformedCollection constructor which has documentation that states that
items existing in the list are NOT transformed.  This yields bizarre unexpected behavior for
this method.

Conversely, the ListUtils.predicatedList(List list, Predicate pred) DOES apply the predicate.
 These methods are very similar but behave inconsistently.

If the transformer is not applied to the list, the method's usefulness is somewhat limited
and causes the user to create an extra unwanted list in some circumstances:

// To transform an existing list
List myList = ... some list to be transformed ...
List transformed = ListUtils.transformedList(new ArrayList(), myTransformer);
transformed.addAll(myList);

I would expect a much shorter implementation such as:

List transformed = ListUtils.transformedList(myList, myTransformer)


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