ListUtils.transformedList(list, transformer) doesn't transform
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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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