Package org.apache.commons.collections4.functors

Class NullPredicate<T>

  • All Implemented Interfaces:
    java.io.Serializable, Predicate<T>
    public final class NullPredicate<T>
extends java.lang.Object
implements Predicate<T>, java.io.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 Predicate INSTANCE
      Singleton predicate instance

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      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

        equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • INSTANCE

        public static final Predicate INSTANCE
        Singleton predicate instance

    • Method Detail

      • 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