ComparatorUtils.transformedComparator wrongly typed (generics)
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Key: COLLECTIONS-372
URL: https://issues.apache.org/jira/browse/COLLECTIONS-372
Project: Commons Collections
Issue Type: Bug
Components: Comparator
Affects Versions: 4.x
Environment: n/a
Reporter: HaveNone
Priority: Minor
ComparatorUtils.transformedComparator is currently typed as follows :
{{public static <I,O> Comparator<O> transformedComparator(Comparator<I>
comparator, Transformer<I, O> transformer)}}
It should be typed as follows so that is can be used without removing generics
typing:
{{public static <I,O> Comparator<I> transformedComparator(Comparator<O>
comparator, Transformer<I, O> transformer)}}
Here is a unit test for it :
Transformer<Integer, String> itosTransformer =
TransformerUtils.stringValueTransformer();
Comparator<Integer> c = new Comparator<Integer>() {
@Override
public int compare(Integer o1, Integer o2) {
return o1.compareTo(o2);
}
};
Comparator<String> stringComparator =
ComparatorUtils.transformedComparator(c, itosTransformer);
stringComparator.compare("string1", "string2");
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