org.apache.commons.collections

Interface Predicate

Known Subinterfaces:
PredicateDecorator
Known Implementing Classes:
AllPredicate, AndPredicate, AnyPredicate, EqualPredicate, ExceptionPredicate, FalsePredicate, IdentityPredicate, InstanceofPredicate, NonePredicate, NotNullPredicate, NotPredicate, NullIsExceptionPredicate, NullIsFalsePredicate, NullIsTruePredicate, NullPredicate, OnePredicate, OrPredicate, TransformedPredicate, TransformerPredicate, TruePredicate, UniquePredicate

public interface Predicate

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 PredicateUtils. These include true, false, instanceof, equals, and, or, not, method invokation and null testing.

Version:
$Revision: 1.11 $ $Date: 2004/04/14 20:08:57 $

Authors:
James Strachan
Stephen Colebourne

Since:
Commons Collections 1.0

Method Summary

boolean
evaluate(Object object)
Use the specified parameter to perform a test that returns true or false.

Method Details

evaluate

public boolean evaluate(Object object)
Use the specified parameter to perform a test that returns true or false.

Parameters:
object - the object to evaluate, should not be changed

Returns:
true or false


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