Class IsEmpty<A>

java.lang.Object
org.apache.commons.functor.core.collection.IsEmpty<A>
Type Parameters:
A - the predicate argument type.
All Implemented Interfaces:
Serializable, Functor, UnaryFunctor<A>, UnaryPredicate<A>
public final class IsEmpty<A> extends Object implements UnaryPredicate<A>, Serializable
Version:
$Revision$ $Date$
See Also:

  • Field Details

    • INSTANCE

      public static final IsEmpty<Object> INSTANCE
      Basic IsEmpty instance.

    • serialVersionUID

      private static final long serialVersionUID
      serialVersionUID declaration.
      See Also:

  • Constructor Details

    • IsEmpty

      public IsEmpty()
      Create a new IsEmpty.

  • Method Details

    • test

      public boolean test(A obj)
      Evaluate this predicate.
      Specified by:
      test in interface UnaryPredicate<A>
      Parameters:
      obj - the A object to test
      Returns:
      the result of this test

    • equals

      public boolean equals(Object that)
      Indicates whether some other object is "equal to" this functor. This method must adhere to general Object.equals contract. Additionally, this method can return true only if the specified Object implements the same functor interface and is known to produce the same results and/or side-effects for the same arguments (if any).

      While implementators are strongly encouraged to override the default Object implementation of this method, note that the default Object implementation does in fact adhere to the functor equals contract.

      Specified by:
      equals in interface Functor
      Overrides:
      equals in class Object
      Parameters:
      that - the object to compare this functor to
      Returns:
      true iff the given object implements this functor interface, and is known to produce the same results and/or side-effects for the same arguments (if any).
      See Also:

    • hashCode

      public int hashCode()
      Returns a hash code for this functor adhering to the general Object.hashCode contract. Implementators are strongly encouraged but not strictly required to override the default Object implementation of this method.
      Specified by:
      hashCode in interface Functor
      Overrides:
      hashCode in class Object
      Returns:
      a hash code for this functor
      See Also:

    • toString

      public String toString()
      Returns a human readable description of this functor. Implementators are strongly encouraged but not strictly required to override the default Object implementation of this method.
      Specified by:
      toString in interface Functor
      Overrides:
      toString in class Object
      Returns:
      a human readable description of this functor

    • testCollection

      private boolean testCollection(Collection<?> col)
      Test a collection.
      Parameters:
      col - to test
      Returns:
      boolean

    • testMap

      private boolean testMap(Map<?,?> map)
      Test a map.
      Parameters:
      map - to test
      Returns:
      boolean

    • testString

      private boolean testString(String str)
      Test a string.
      Parameters:
      str - to test
      Returns:
      boolean

    • testArray

      private boolean testArray(Object array)
      Test an array.
      Parameters:
      array - to test
      Returns:
      boolean

    • instance

      public static <A> IsEmpty<A> instance()
      Get an IsEmpty instance.
      Type Parameters:
      A - the predicate argument type.
      Returns:
      IsEmpty