org.apache.commons.collections
public interface Predicate
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 PredicateUtils. These include true, false, instanceof, equals, and, or, not, method invokation and null testing.
Since: Commons Collections 1.0
Version: $Revision: 155406 $ $Date: 2005-02-26 12:55:26 +0000 (Sat, 26 Feb 2005) $
Method Summary | |
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boolean | evaluate(Object object)
Use the specified parameter to perform a test that returns true or false.
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Parameters: object the object to evaluate, should not be changed
Returns: true or false
Throws: ClassCastException (runtime) if the input is the wrong class IllegalArgumentException (runtime) if the input is invalid FunctorException (runtime) if the predicate encounters a problem