Class NullPredicate

  • All Implemented Interfaces:
    java.io.Serializable, Predicate

    public final class NullPredicate
    extends java.lang.Object
    implements Predicate, java.io.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) $
    See Also:
    Serialized Form
    • Field Summary

      Fields 
      Modifier and Type Field Description
      static Predicate INSTANCE
      Singleton predicate instance
      private static long serialVersionUID
      Serial version UID
    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private NullPredicate()
      Restricted constructor.
    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean evaluate​(java.lang.Object object)
      Evaluates the predicate returning true if the input is null.
      static Predicate getInstance()
      Factory returning the singleton instance.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Field Detail

      • serialVersionUID

        private static final long serialVersionUID
        Serial version UID
        See Also:
        Constant Field Values
      • INSTANCE

        public static final Predicate INSTANCE
        Singleton predicate instance
    • Constructor Detail

      • NullPredicate

        private NullPredicate()
        Restricted constructor.
    • Method Detail

      • getInstance

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

        public boolean evaluate​(java.lang.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