org.apache.commons.collections.functors
Class NullIsTruePredicate

java.lang.Object
  org.apache.commons.collections.functors.NullIsTruePredicate

All Implemented Interfaces:

java.io.Serializable, PredicateDecorator, Predicate

public final class NullIsTruePredicate
extends java.lang.Object
implements Predicate, PredicateDecorator, java.io.Serializable

Predicate implementation that returns true if the input is null.

Since:

Commons Collections 3.0

Version:

$Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $

Author:

Stephen Colebourne

See Also:

Serialized Form

Constructor Summary

NullIsTruePredicate(Predicate predicate)
Constructor that performs no validation.

Method Summary

boolean	evaluate(java.lang.Object object) Evaluates the predicate returning the result of the decorated predicate once a null check is performed.
static Predicate	getInstance(Predicate predicate) Factory to create the null true predicate.
Predicate[]	getPredicates() Gets the predicate being decorated.

Methods inherited from class java.lang.Object

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

Constructor Detail

NullIsTruePredicate

public NullIsTruePredicate(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 true predicate.

Parameters:

predicate - the predicate to decorate, not null

Returns:

the predicate

Throws:

java.lang.IllegalArgumentException - if the predicate is null

evaluate

public boolean evaluate(java.lang.Object object)

Evaluates the predicate returning the result of the decorated predicate once a null check is performed.

Specified by:

evaluate in interface Predicate

Parameters:

object - the input object

Returns:

true if decorated predicate returns true or input is null

getPredicates

public Predicate[] getPredicates()

Gets the predicate being decorated.

Specified by:

getPredicates in interface PredicateDecorator

Returns:

the predicate as the only element in an array

Since:

Commons Collections 3.1