org.apache.commons.collections.functors
Class NullIsFalsePredicate

java.lang.Object
  |
  +--org.apache.commons.collections.functors.NullIsFalsePredicate

All Implemented Interfaces:

Predicate, Serializable

public final class NullIsFalsePredicate

extends Object

implements Predicate, Serializable

Predicate implementation that returns false if the input is null.

Since:

Commons Collections 3.0

Version:

$Revision: 1.2 $ $Date: 2004/01/14 21:43:09 $

Author:

Stephen Colebourne

See Also:

Serialized Form

Constructor Summary

NullIsFalsePredicate(Predicate predicate)
Constructor that performs no validation.

Method Summary

boolean	evaluate(Object object) Return false if the object equals null else call the decorated predicate.
static Predicate	getInstance(Predicate predicate) Factory to create the null false predicate.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NullIsFalsePredicate

public NullIsFalsePredicate(Predicate predicate)

Constructor that performs no validation. Use getInstance if you want that.

Parameters:

predicate - the predicate to call after the null check

Method Detail

getInstance

public static Predicate getInstance(Predicate predicate)

Factory to create the null false predicate.

Parameters:

predicate - the predicate to decorate, not null

Returns:

the predicate

Throws:

IllegalArgumentException - if the predicate is null

evaluate

public boolean evaluate(Object object)

Return false if the object equals null else call the decorated predicate.

Specified by:

evaluate in interface Predicate

Parameters:

object - the object to evaluate

Returns:

true or false