Class TransposedPredicate<L,R>

java.lang.Object
org.apache.commons.functor.core.composite.TransposedPredicate<L,R>
Type Parameters:
L - the left argument type.
R - the right argument type.
All Implemented Interfaces:
Serializable, BinaryFunctor<L,R>, BinaryPredicate<L,R>, Functor
public class TransposedPredicate<L,R> extends Object implements BinaryPredicate<L,R>, Serializable
Transposes (swaps) the arguments to some other predicate. For example, given a predicate p and the ordered pair of arguments a, b. tests p.test(b,a).

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

Version:
$Revision$ $Date$
See Also:

  • Field Details

    • serialVersionUID

      private static final long serialVersionUID
      serialVersionUID declaration.
      See Also:

    • predicate

      private final BinaryPredicate<? super R, ? super L> predicate
      The adapted predicate.

  • Constructor Details

    • TransposedPredicate

      public TransposedPredicate(BinaryPredicate<? super R, ? super L> predicate)
      Create a new TransposedPredicate.
      Parameters:
      predicate - the BinaryPredicate to transpose

  • Method Details

    • test

      public final boolean test(L left, R right)
      Evaluate this predicate.
      Specified by:
      test in interface BinaryPredicate<L,R>
      Parameters:
      left - the L element of the ordered pair of arguments
      right - the R element of the ordered pair of arguments
      Returns:
      the result of this test for the given arguments

    • 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(TransposedPredicate<?,?> that)
      Learn whether another TransposedPredicate is equal to this.
      Parameters:
      that - the TransposedPredicate 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

    • transpose

      public static <L,R> TransposedPredicate<R,L> transpose(BinaryPredicate<? super L, ? super R> p)
      Return the transposition of p.
      Type Parameters:
      L - the left argument type.
      R - the right argument type.
      Parameters:
      p - BinaryPredicate to transpose
      Returns:
      TransposedPredicate