Package org.apache.commons.collections4.functors

Class NullIsFalsePredicate<T>

java.lang.Object

org.apache.commons.collections4.functors.NullIsFalsePredicate<T>

All Implemented Interfaces:

Serializable, Predicate<T>, PredicateDecorator<T>, Predicate<T>

public final class NullIsFalsePredicate<T>
extends Object
implements PredicateDecorator<T>, Serializable

Predicate implementation that returns false if the input is null.

Since:

3.0

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
NullIsFalsePredicate(Predicate<? super T> predicate)	Constructor that performs no validation.

Method Summary

Modifier and Type	Method	Description
boolean	evaluate(T object)	Evaluates the predicate returning the result of the decorated predicate once a null check is performed.
Predicate<? super T>[]	getPredicates()	Gets the predicate being decorated.
static <T> Predicate<T>	nullIsFalsePredicate(Predicate<? super T> 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

Methods inherited from interface java.util.function.Predicate

and, negate, or

Methods inherited from interface org.apache.commons.collections4.Predicate

test

Constructor Details

NullIsFalsePredicate

public NullIsFalsePredicate(Predicate<? super T> predicate)

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

Parameters:

predicate - the predicate to call after the null check

Method Details

nullIsFalsePredicate

public static <T> Predicate<T> nullIsFalsePredicate(Predicate<? super T> predicate)

Factory to create the null false predicate.

Type Parameters:

T - the type that the predicate queries

Parameters:

predicate - the predicate to decorate, not null

Returns:

the predicate

Throws:

NullPointerException - if the predicate is null

evaluate

public boolean evaluate(T object)

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

Specified by:

evaluate in interface Predicate<T>

Parameters:

object - the input object

Returns:

true if decorated predicate returns true, false if input is null

getPredicates

public Predicate<? super T>[] getPredicates()

Gets the predicate being decorated.

Specified by:

getPredicates in interface PredicateDecorator<T>

Returns:

the predicate as the only element in an array

Since:

3.1