Package org.apache.commons.collections.functors

Class NullPredicate

java.lang.Object
org.apache.commons.collections.functors.NullPredicate
All Implemented Interfaces:
Serializable, Predicate
public final class NullPredicate extends Object implements Predicate, Serializable
Predicate implementation that returns true if the input is null.
Since:
Commons Collections 3.0
Version:
$Revision: 646777 $ $Date: 2008-04-10 14:33:15 +0200 (Thu, 10 Apr 2008) $
Author:
Stephen Colebourne
See Also:

  • Field Details

    • INSTANCE

      public static final Predicate INSTANCE
      Singleton predicate instance

  • Method Details

    • getInstance

      public static Predicate getInstance()
      Factory returning the singleton instance.
      Returns:
      the singleton instance
      Since:
      Commons Collections 3.1

    • evaluate

      public boolean evaluate(Object object)
      Evaluates the predicate returning true if the input is null.
      Specified by:
      evaluate in interface Predicate
      Parameters:
      object - the input object
      Returns:
      true if input is null