Defines a functor interface implemented by classes that perform a predicate test on an object.
A Predicate
is the object equivalent of an if
statement. It uses the input object to return a true or false value, and is often used in validation or filtering.
Standard implementations of common predicates are provided by {@link PredicateUtils}. These include true, false, instanceof, equals, and, or, not, method invokation and null testing.
@param < T> the type that the predicate queries
@since 1.0
@version $Id: Predicate.java 1469004 2013-04-17 17:37:03Z tn $