Package org.apache.commons.collections4.functors

Class NullPredicate<T>

java.lang.Object

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

All Implemented Interfaces:

Serializable, Predicate<T>, Predicate<T>

public final class NullPredicate<T>
extends Object
implements Predicate<T>, Serializable

Predicate implementation that returns true if the input is null.

Since:

3.0

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final Predicate	INSTANCE	Singleton predicate instance

Method Summary

Modifier and Type	Method	Description
boolean	evaluate(T object)	Evaluates the predicate returning true if the input is null.
static <T> Predicate<T>	nullPredicate()	Factory returning the singleton instance.

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

Field Details

INSTANCE

public static final Predicate INSTANCE

Singleton predicate instance

Method Details

nullPredicate

public static <T> Predicate<T> nullPredicate()

Factory returning the singleton instance.

Type Parameters:

T - the type that the predicate queries

Returns:

the singleton instance

Since:

3.1

evaluate

public boolean evaluate(T object)

Evaluates the predicate returning true if the input is null.

Specified by:

evaluate in interface Predicate<T>

Parameters:

object - the input object

Returns:

true if input is null