Class UnaryFunctionUnaryPredicate<A>

java.lang.Object
org.apache.commons.functor.adapter.UnaryFunctionUnaryPredicate<A>
Type Parameters:
A - the argument type.
All Implemented Interfaces:
Serializable, Functor, UnaryFunctor<A>, UnaryPredicate<A>
public final class UnaryFunctionUnaryPredicate<A> extends Object implements UnaryPredicate<A>, Serializable
Adapts a Boolean-valued UnaryFunction to the UnaryPredicate interface.

Note that although this class implements Serializable, a given instance will only be truly Serializable if the underlying function is. Attempts to serialize an instance whose delegate is not Serializable will result in an exception.

Version:
$Revision$ $Date$
See Also:

  • Field Details

  • Constructor Details

  • Method Details

    • test

      public boolean test(A obj)
      Evaluate this predicate. Returns the boolean value of the non-null Boolean returned by the evaluate method of my underlying function.
      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:

    • equals

      public boolean equals(UnaryFunctionUnaryPredicate<?> that)
      Learn whether another UnaryFunctionUnaryPredicate is equal to this.
      Parameters:
      that - UnaryFunctionUnaryPredicate to test
      Returns:
      boolean

    • 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

    • adapt

      public static <A> UnaryFunctionUnaryPredicate<A> adapt(UnaryFunction<? super A, Boolean> function)
      Adapt the given, possibly-null, UnaryFunction to the UnaryPredicate interface. When the given UnaryFunction is null, returns null.
      Type Parameters:
      A - the argument type.
      Parameters:
      function - the possibly-null UnaryFunction to adapt
      Returns:
      a UnaryPredicate wrapping the given UnaryFunction, or null if the given UnaryFunction is null