On the CVS you will find a whole package full of predicate implementations,
including this one - NotPredicate. Also accessible through PredicateUtils.
Still working towards a release....
Stephen
----- Original Message -----
From: "Keith Bennett" <[EMAIL PROTECTED]>
> When using the Predicate interface, I thought it would be useful to be
> able to negate a predicate rather than writing a new one with the
> opposite behavior. Soon afterwards, I encountered a real need for
> such a thing, so I wrote it. If you think this would be useful to add
> to the library (as I do IMHO), feel free to do so, or let me know how
> I can be of help in doing so. Here it is:
>
> -----
>
> import org.apache.commons.collections.Predicate;
>
> /**
> * Wraps a Predicate and reverses its return value.
> */
> public class NegatingPredicate implements Predicate
> {
>
> private Predicate predicate;
>
> /**
> * Creates an instance with the specified Predicate.
> *
> * @param p the predicate to wrap and reverse
> */
> NegatingPredicate(Predicate p) {
> predicate = p;
> }
>
> /**
> * Gets the result of the wrapped Predicate and negates it.
> *
> * @param o the object to evaluate
> */
> public boolean evaluate(Object o) {
> return ! predicate.evaluate(o);
> }
> }
>
> -----
>
> - Keith Bennett
>
>
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