[beanutils] A BeanPredicate which wraps another Predicate

[Tim O'Brien]

BeanUtils has a BeanPropertyValueEqualsPredicate, this Predicate uses 
PropertyUtils to get a bean property and then checks to see if the bean 
property equals a certain value.

This is great if your application needs to test a bean property for 
equality, but it limits what can be done with the various Predicates now 
available in collections 3.0.

I've added a BeanPredicate which allows you to decorate a Predicate to 
act upon a bean property.  This class is in the spirit of BeanComparator.

BeanPropertyValueEqualsPredicate predicate =
    new BeanPropertyValueEqualsPredicate( "activeEmployee",
                                          Boolean.FALSE );
Now becomes,

BeanPredicate predicate =
    new BeanPredicate( "activeEmployee",
                       new EqualPredicate( Boolean.FALSE ) );
And it also allow for other predicates.  To check for a null bean property:

BeanPredicate predicate =
    new BeanPredicate( "name", NullPredicate.INSTANCE );
Or to test the type of a bean property:

BeanPredicate predicate =
    new BeanPredicate( "name", new InstanceofPredicate(String.class) );
... and so on and so forth ...

Tim



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