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

java.lang.Object
  extended by org.apache.commons.collections4.functors.NullIsFalsePredicate<T>
All Implemented Interfaces:
Serializable, PredicateDecorator<T>, Predicate<T>

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

Predicate implementation that returns false if the input is null.

Since:
3.0
Version:
$Id: NullIsFalsePredicate.java 1476582 2013-04-27 14:13:54Z tn $
See Also:
Serialized Form

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

Constructor Detail

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 Detail

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:
IllegalArgumentException - 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


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