Package org.apache.commons.collections4.functors

Class NullIsTruePredicate<T>

java.lang.Object

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

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

Type Parameters:

T - the type of the input to the predicate.

All Implemented Interfaces:

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

public final class NullIsTruePredicate<T>
extends AbstractPredicate<T>
implements PredicateDecorator<T>, Serializable

Predicate implementation that returns true if the input is null.

Since:

3.0

See Also:

• Serialized Form

Constructor Summary

Constructors

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

Method Summary

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

Methods inherited from class org.apache.commons.collections4.functors.AbstractPredicate

evaluate

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

evaluate

Constructor Details

NullIsTruePredicate

public NullIsTruePredicate(Predicate<? super T> predicate)

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

Parameters:

predicate - the predicate to call after the null check

Method Details

nullIsTruePredicate

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

Creates the null true 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

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

test

public boolean test(T object)

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

Specified by:

test in interface Predicate<T>

Specified by:

test in interface Predicate<T>

Parameters:

object - the input object

Returns:

true if decorated predicate returns true or input is null